CN102382481B - A kind of green environment-friendly cushioning fiber packaging material and preparation method thereof - Google Patents

Abstract

The invention discloses a green environment-friendly cushioning fiber packaging material and a preparation method thereof. When preparing, firstly dry the natural plant fiber in the air flow until the moisture content of the fiber is 8% to 13%, then add waterproofing agent, flame retardant and preservative as chemical additives, use ethyl acetate as diluent, and MPU-20 The polyurethane resin adhesive is diluted to 3-5 times the original volume of the mixed solution, and the spray gun is used as the airflow generating device, and the chemically modified solution and the foaming MPU- 20 The mixed liquid of the polyurethane resin dispersion is sucked into the airflow and forms a gas/liquid two-phase mixture fluid, and the airflow is mixed with the plant fiber; it is formed into an ultra-low density (≥50kg/m ³ ) packaging material. The cushioning performance of the material is better than that of corrugated cardboard and honeycomb cardboard. The material has the advantages of easy machining, good antibacterial performance, low cost, good dimensional stability, and strong moisture resistance.

Description

A kind of green environment-friendly cushioning fiber packaging material and preparation method thereof

technical field

The fiber packaging material involved in the present invention, in particular, relates to a green and environment-friendly cushioning fiber packaging material and a preparation method thereof. The material can be used as a cushioning packaging material for packaging industrial electronic products.

Background technique

Plastic macromolecular compounds are generally macromolecular polymers and other products formed by processing low molecular compounds such as ethylene. Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polystyrene (EPS/ As the most common plastic, XPS is favored by consumers because of its advantages such as convenient processing, low production cost and excellent physical properties. Plastics are widely used, such as food fast food boxes, packaging bags, and cushioning packaging materials for industrial products, as well as plastic building materials such as thermal insulation materials and decorative materials in the construction field. However, there are many problems in the manufacture and use of these plastic materials, such as the difficulty of biodegradation and the precipitation of bisphenols toxic substances at high temperatures, which have serious harm to the environment, causing serious environmental pollution, and harming the human body and mind. This form of pollution is often called "white pollution" and has become one of the most serious pollution hazards in the current society. For this reason, many countries in the world have adopted or are adopting mandatory legislation to prohibit the production and use of foamed plastics. Facing the current "white pollution problem", people have adopted many technical measures, such as incineration to recover heat energy, landfill, chemical recycling and recycling of waste plastics, etc. to solve or reduce its impact on the environment. However, these treatment methods still have problems such as complex process, high cost and inability to fundamentally solve the environmental pollution caused by plastic waste.

At present, the environmentally degradable plastics can be divided into the following three types [Huang Farong. Research on Environmentally Degradable Plastics, Materials Herald, 2007, 14(7): 40-44]: (1) Photodegradable plastics, mainly composed of unsaturated hydrocarbons Polymers formed by copolymerization with CO or polymers produced by adding transition metal compounds, photosensitizers and polyaromatic compounds; (2) Biodestructive plastics, mainly produced by adding starch or biodegradants to plastics (3) Foamed plastics with fully biodegradable functions, such as polyhydroxyalkanoate (PHAs) plastics, polylactic acid (PLA) plastics, polyε-caprolactone (PCL) plastics, Polyacid diol polyester plastics, starch (Starch) plastics and polyvinyl alcohol plastics, etc. Among the above-mentioned environmentally degradable plastics, fully biodegradable foamed plastics are developing rapidly.

At present, scholars at home and abroad mainly use the method of wet foaming (Xie Yongqun, Chen Yan, Zhang Biguang. Research on plant fiber expanded materials [J]. Wood Industry, 2004, 18 (2): 30-32.) to make plant fibers in water Stir in the mixed state and cause broomification, add adhesive to orientate and combine the fibers, and then add surfactant and adhesive under stirring conditions to form many small vapor chambers to achieve the purpose of increasing the volume. The formed many small vapor chambers make the material It has certain cushioning and mechanical properties. In addition, Chinese scholars also use four kinds of pulp such as bagasse chemical pulp, fir mechanical pulp, masson pine blasting pulp and newsprint waste paper pulp as raw materials (Chen Yan. Research on cushioning packaging materials made of expanded fiber [P]. Master's degree thesis, 2004) , use composite adhesive, foam forming agent, fiber extension agent (polyacetic acid emulsion glue) and calcium carbonate filler to expand the foaming material with holes. The air bubbles are stabilized. When drying, the water in the slurry is gradually evaporated, and the fiber gaps are smaller until they are connected. It is believed that the internal three-dimensional cross structure of the puffed fibers proves the existence of the tension effect of the air bubbles on the fibers. The puffed packaging material not only has In addition to the natural degradation, reusability, renewable and extensive resources of natural materials, it also has the characteristics of low density, impact resistance, thermal insulation, sound absorption and shock resistance of plastic foam packaging materials.

However, in the process of manufacturing pulp molding and plant fiber cushioning packaging materials using degradable plant fibers as raw materials, there are still some problems as follows: (1) In pulp molding, low-concentration waste paper pulp is mainly used to suspend Liquid is the research object, and the preliminary molding is carried out by vacuum suction molding through the suction hole in the mold, and then hot-pressed and shaped in the hot mold, mainly for the production of low-thickness products. The disadvantage of this molding method is that the water consumption is large and the process is complicated. , the pollution is serious, and low-grade packaging products are mostly produced. If the products with high whiteness are produced, deinking treatment needs to be continued, so the cost is high and the pollution is more serious. It is necessary to improve its performance or production for the application of packaging large electronic instruments. Molded products with complex structures can be used to improve their performance, so there is still considerable potential for developing pulp molded products made from waste paper pulp. (2) Plant fiber foaming materials are mainly baked or extruded and foamed with plant fiber and starch as the main materials, and most of them are foamed with chemical foaming agents, which has a certain negative impact on the environment. In addition, starch molecules contain countless hydroxyl groups. Although many researchers currently use esterification or acetylation to modify hydroxyl groups to improve their water resistance, it is still difficult to achieve water resistance, and starch foaming materials are due to raw materials. The wide range of sources, high cost and high brittleness also limit the wide application of this kind of packaging material, which has been mentioned in some materials.

Contents of the invention

The main purpose of the patent of the invention is to overcome the shortcomings of the current domestic and foreign cushioning packaging materials, and provide a green and environmentally friendly ultra-low density natural fiber cushioning packaging material.

Another object of the present invention is to provide a preparation method of the above-mentioned green environment-friendly natural fiber cushioning packaging material.

In the present invention, the plant fiber is uniformly mixed with chemical additives in high-speed dispersion and treated for a period of time, so that the hydroxyl chemical groups on the surface of the plant fibers are modified, and some water-repellent groups are grafted and reacted to make it form a water molecule. The ability of hydrogen bonds is greatly reduced, thereby improving its waterproof performance; by grafting some groups on the surface of plant fibers with hydroxyl groups, the plant fibers can produce strong oxygen-consuming substances or chemical substances with fire extinguishing properties during combustion, making them have The ability to prevent further burning; at the same time, antibacterial additives are added to reduce the viability of germs or mold in the plant fiber environment. After the plant fiber is treated, it is highly uniformly mixed with MUP-20 polyurethane adhesive compound. This method makes the resin particles evenly distributed on the surface of the plant fiber to obtain better uniformity. By introducing a large amount of foamable polyurethane adhesive on the surface of plant fibers and generating foaming and crosslinking reactions under the influence of water vapor, the interior of the material tends to be microporous, so that the prepared fiber material has the ability to resist external impact or Absorb the energy applied by the outside world, thus endowing the material with better cushioning performance. According to the target density and thickness, inject an appropriate amount of the above-mentioned fiber/chemical additive/adhesive mixture into the reaction zone of the reactor, and after fixing it, spray high-temperature steam from the injection hole at the lower part of the reactor; The active groups on the fiber surface undergo crosslinking and curing reactions with -OH, -COOH or phenolic hydroxyl groups, and undergo foaming reactions with steam (H ₂ O molecules), forming a huge amount of microporous structure inside the material. Make the material structure tend to be light and microporous.

The purpose of the present invention is achieved through the following technical solutions:

A preparation method of a green and environment-friendly plant fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: dry the natural plant fiber in air flow until the moisture content of the fiber is 8% to 13%;

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 8-15% flame retardant and 0.2-1.2% preservative as chemical auxiliary agents accounting for 1-3% of dry plant fiber weight, And add water to dilute to make a chemically modified solution whose solid content of chemical additives accounts for 65-90% of the total solution weight; wherein the waterproofing agent is SH-202R type silicon copper waterproofing agent, and the flame retardant is SUNFOR-RDP type oligophosphate Ester flame retardant, preservative is TST25 type Kathon preservative;

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to a mixed solution 3-5 times the original volume, and stir and mix the obtained mixed solution Uniform; the consumption of MPU-20 polyurethane tree is that described mixed solution accounts for 10～30% of dry natural plant fiber weight;

(4) mixing: the chemical modification solution prepared by step (2) and the foamable MPU-20 polyurethane resin dispersion prepared by step (3) are stirred and mixed evenly and then put into the liquid storage tank of the high-speed spray gun. (1) The plant fiber of gained is put into the high-pressure resistant polyethylene plastic bag; Take spray gun as airflow generating device, utilize the high-speed airflow negative pressure effect that produces when spray gun starts, the mixed solution in the described liquid storage tank is sucked into airflow And form a gas/liquid two-phase mixture fluid, and the air flow is mixed with the plant fiber in the high-pressure polyethylene plastic bag;

(5) Molding: first remove or open the upper orifice plate of the former, inject the mixture obtained in step (4) into the material forming area, spread the lower part of the mixture evenly on the lower injection orifice plate, and inject 400~ After 20 to 30 seconds of steam at a pressure of 700kPa, stop feeding the steam, keep the mixture in the forming zone for nearly 1 to 30 minutes, and then take it out, and dry and reduce the moisture content of the material to 10 to 13%.

Further, the natural plant fiber is preferably one or more of coniferous pine wood fiber, broad-leaved poplar wood fiber and non-wood straw fiber.

The drying until the fiber moisture content is 8% to 13% is through air drying at 60°C to 105°C.

Stir and mix the mixed liquid in the step (3) uniformly on a high-speed digital display mixer, and stir and mix for 1-3 minutes under the condition of a rotating speed of 1000-2000 r/min.

Stirring and mixing uniformly in the step (4) is carried out on a high-speed digital display mixer at 1000-2000 r/min stirring and mixing for 1-3 minutes.

The forming device in the step (4) includes an upper orifice plate, a heat insulating material, a lower injection orifice plate, a high-temperature pressure steam inlet and a forming cavity; the upper end of the forming cavity is provided with an upper orifice plate, and the lower end is provided with a lower injection orifice plate, A plurality of high-temperature pressure steam inlets are arranged on the lower injection orifice plate, and heat insulating materials are arranged on the periphery of the forming cavity.

Another object of the present invention is to provide a green and environment-friendly plant fiber cushioning packaging material, which is prepared by any one of the above-mentioned methods. The green and environment-friendly plant fiber cushioning packaging material is a network structure composed of plant fibers. The density of the material is ≤100kg/m ³ , the thickness is ≥30mm, and the water absorption rate is ≤0.5%. There is no mildew phenomenon in 12 months; the minimum dynamic buffer coefficient of the material is ≥6.0, the static buffer coefficient is ≥4.0, and the material yields twice during the static buffer process.

Compared with the buffer packaging material of the prior art, the inventive product has the following advantages:

1. It can produce ultra-low density porous natural fiber cushioning packaging materials, the density of which is <=100kg/m ³ , the thickness can be ≥20mm, and the porosity is above 99%.

2. The production cycle is extremely short, about 1.5 minutes, which is 1/25-1/100 of the production cycle of the traditional hot molding method, and 1/3 of the steam spray hot pressing method, which is equivalent to the production time of polystyrene and other foamed plastics.

3. Using clean water vapor molecules as foaming agent and processing medium, the foaming gas produced is also colorless and non-toxic. The whole production process will not produce noise, air and water pollution that will affect the surrounding environment. The preparation technology of cardboard, honeycomb cardboard, EPS foam plastic and pulp molded products is unmatched.

4. Under the same strain conditions, the order of the static stress corresponding to the material is: agricultural waste plant fiber mat <fibrous formed body It can produce a better cushioning effect under low pressure, while honeycomb paperboard and EPS foam can play a good cushioning effect only under high static stress conditions.

5. Compared with other cushioning packaging materials, this new green environmental protection cushioning material will have a secondary yield effect during the static cushioning process, so it greatly improves the cushioning efficiency of the package, and can produce under higher stress requirements cushioning effect.

6. Compared with corrugated cardboard, the new green environmental protection buffer material has a lower maximum acceleration value, while the maximum acceleration value of corrugated cardboard is very high, and the new buffer material can obtain the minimum impact under the condition of higher impact static stress The maximum acceleration value, while the corrugated cardboard needs to obtain the minimum maximum acceleration value under a very low impact static stress.

7. Compared with the honeycomb paperboard, the new buffer material has the smallest maximum acceleration value, but the new buffer material has better buffer performance, the reason is that the new buffer material can withstand higher impact static stress conditions Obtain the smallest maximum acceleration value, while honeycomb paperboard can only obtain the smallest maximum acceleration value under relatively low conditions.

8. Compared with EPS foam plastics, this new type of cushioning material has poor cushioning performance. The reason is that the minimum and maximum acceleration value of polyurethane foam plastics is lower than that of this new type of cushioning material, and this new type of cushioning material can also be used in Under the condition of higher shock static stress, lower shock static stress is obtained.

9. Honeycomb paperboard is a kind of rigid material, which is expensive and has poor recovery performance. Once it is crushed, it cannot be used again. Its production process and product structure are very complicated, and pulp molded products are too dense because of its Under the conditions of large static stress, high drop height or multiple impacts, the anti-vibration and impact resistance performance is poor, so only small packaging liners can be made. Unlike honeycomb paperboard and pulp molding, the new cushioning material does not have the above problems.

10. The material has good moisture resistance (less than 8%) and good dimensional stability (less than 2%) in harsh environments. The product has good mechanical processing performance, and the product can be processed into materials of any shape by mechanical cutting and other methods. There is no release of any toxic substances in the process of production and use, and it is a new green and environmentally friendly product that is widely loved by consumers.

Description of drawings

Fig. 1 is a schematic diagram of the device for preparing the green and environment-friendly fiber cushioning packaging material of the present invention.

Fig. 2 is the comparison of the dynamic cushioning performance of the green environmental protection fiber cushioning packaging material (a) of the present invention with honeycomb paperboard (b), foamed polyurethane foam (c) and double-layer stacked AB type double corrugated cardboard (d).

Detailed ways

In order to understand the present invention more deeply, the present invention will be further described below in conjunction with the examples. It should be noted that the protection scope of the present invention is not limited to the scope described in the examples.

As shown in Figure 1 , a molding machine for preparing green and environmentally friendly functional heat-insulating and sound-absorbing materials includes an upper orifice plate 1, a heat insulating material 2, a lower injection orifice plate 3, a high-temperature pressure steam inlet 4, and a molding cavity 5. The upper end of the forming cavity 5 is provided with an upper orifice plate 1, and the lower end is provided with a lower spraying orifice plate 3. The lower spraying orifice plate 3 is provided with a plurality of high-temperature pressure steam inlets 4, and the outer periphery of the forming cavity 5 is provided with a heat insulating material 2. After the fiber is chemically modified, it is mixed with MPU-20 resin, the mixed reactant is put into the molding cavity 5, and the upper orifice plate 1 is adjusted to achieve the predetermined density and thickness of the material.

Example 1

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: air-dry the natural plant fibers at 95°C until the moisture content of the fibers is 12%; the natural plant fibers are coniferous wood fibers prepared by disc grinding; wherein the fiber size is: 14 mesh through sieving Number of fiber content ≤ 10%; fiber content of 14 mesh but retained in 100 mesh ≤ 80%; fiber content of 100 mesh number ≥ 10%.

(2) Preparation of chemically modified solution: in the mixing tank, add SH-202R type silicon-copper waterproofing agent, 11% flame retardant and 0.9% preservative that account for 2% of dry plant fiber weight, and Add water to form a chemically modified solution whose solid content accounts for 80% of the total solution weight; wherein the waterproofing agent is SH-202R type silicon copper waterproofing agent (Zaoyang Sihai Chemical Co., Ltd.), and the flame retardant is SUNFOR-RDP oligomerization Phosphate ester flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), preservative is TST25 Kathon preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stir and mix for 2 minutes under the condition of 1500r/min; the dosage of MPU-20 polyurethane tree is that the liquid weight accounts for 15% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared in step (3) were also stirred and mixed at a high speed (1500r/min) for 2min on a high-speed digital display mixer, and put it into In the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tools Manufacturing Co., Ltd.), the mixed liquid in the liquid storage tank is sucked by the negative pressure of the high-speed airflow generated when the spray gun is started. Air flow and form a gas/liquid two-phase mixture fluid, and the air flow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Molding: As shown in Figure 1, first remove or open the upper orifice plate 1 of the former, inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and then pour the mixture into the material forming area 5. Pave the parts as evenly as possible on the lower injection orifice plate 3, and after 25 seconds of steam at a pressure of 500kPa is introduced from the steam inlet 4, stop steaming and keep it in the forming area for nearly 15 minutes before taking it out, heat insulation material 2 In order to reduce the heat loss effect of steam, the fiber material is molded; after molding, the moisture content of the material is dried and reduced to 12%.

The pores of the obtained fiber material are divided into elliptical, circular, polygonal, triangular and irregular-shaped pore features, mainly the pores between fibers/fibers and the pores inside the fiber cell cavity, and the fibers are connected to form a continuous space network structure. As a function of bearing force during the buffering process, the inter-fiber pores and the inner pores of the fiber play a buffering role during the buffering process of the fiber material being compressed by an external force. The entire shape of the material is natural color and porous structure.

After testing, the density of the obtained material is 85kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 5.8, the water absorption rate is ≤0.5%, and the flame retardant level is V-1 standard (UL94 standard). Mildew phenomenon; the static buffer coefficient can be as low as 4.55, and there will be 2 yield phenomena during the static buffer process, the moisture resistance is 5.6%, and the shrinkage and expansion coefficient are 1.3%.

The material has better cushioning properties than agricultural waste plant fiber mats, double-layer laminated AB-type double corrugated cardboard and honeycomb cardboard, and is slightly inferior to plastic products such as EPS foam and polyurethane foam. Fig. 2 is the comparison of the dynamic cushioning performance of the green environmental protection fiber cushioning packaging material (a) of the present invention with honeycomb paperboard (b), foamed polyurethane foam (c) and double-layer stacked AB type double corrugated cardboard (d). As shown in Figure 2, compared with double-layered AB-type double corrugated cardboard, the formed body has very good dynamic cushioning performance. The formed body has a very low maximum acceleration value, while the maximum acceleration value of the double-layered AB type double corrugated cardboard is very high. Again, the formed body can obtain the smallest maximum acceleration value under the condition of higher impact static stress, while The double-stacked AB-type double-corrugated cardboard needs to obtain the smallest maximum acceleration value under a very low impact static stress. Compared with honeycomb paperboard, the formed body has the smallest maximum acceleration value, but the formed body has better cushioning performance, the reason is that the formed body can obtain the smallest maximum acceleration value under the condition of higher impact static stress, while the Honeycomb paperboard can only achieve the smallest maximum acceleration value under relatively low conditions. Compared with polyurethane foam, molded body has poor cushioning performance, the reason is that the minimum and maximum acceleration value of polyurethane foam is lower than that of molded body, and molded body can also be subjected to higher impact static stress conditions. Obtain lower impact static stress.

Compared with the above-mentioned environment-friendly general-purpose cushioning packaging materials, the product of this embodiment also has the characteristics of short production cycle and simple equipment. For example, the production cycle of preparing a material sample with the above-mentioned density is nearly 1.5 minutes. Honeycomb paperboard is a kind of rigid material, which is expensive and has poor recovery performance. Once it is crushed, it cannot be used again. Under the conditions of large static stress, high drop height or multiple impacts, the anti-vibration and impact resistance is poor, so only small packaging liners can be made. Although foam plastics such as EPS, which are frequently used at present, have excellent cushioning properties, they cause extremely serious environmental pollution problems such as "white pollution" in the process of manufacture and use. Therefore, it is of great practical and long-term significance to develop the green and environment-friendly ultra-low density fiber forming body. After the plant fiber is treated with high-temperature steam, it can almost kill many harmful substances such as mold, which is very beneficial for packaging import and export. It can be used for packaging small and medium-sized electronic products.

Example 2

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 105°C until the moisture content of the fiber is 13%; the natural plant fiber is coniferous pine wood fiber prepared by the disc grinding method; wherein the fiber size is: by The fiber content of the 14-mesh sieve is ≤ 10%; the fiber content of the 100-mesh sieve is ≤ 80%; the fiber content of the 100-mesh ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 15% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 90% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stirring and mixing for 3 minutes under the condition of 2000r/min; the dosage of MPU-20 polyurethane tree is that the liquid weight accounts for 30% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) are also stirred and mixed at a high speed (2000r/min) for 3min on a high-speed digital display mixer, and put it into In the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tools Manufacturing Co., Ltd.), the mixed liquid in the liquid storage tank is sucked by the negative pressure of the high-speed airflow generated when the spray gun is started. Air flow and form a gas/liquid two-phase mixture fluid, and the air flow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower injection orifice plate 3, and after 30s of steam at a pressure of 700kPa is introduced from the steam inlet 4, the steam is stopped and kept in the forming area for nearly 30 minutes before being taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 13%.

After testing, the density of the obtained material is 82kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 4.8, the water absorption rate is 0.5%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static cushioning coefficient is 5.23, and there will be 2 yielding phenomena during the static cushioning process, the moisture resistance is 5.1%, and the shrinkage and expansion coefficient is 1.1%.

Example 3

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 70°C until the moisture content of the fiber is 10%; the natural plant fiber is a broad-leaved poplar wood fiber prepared by a disc grinding method; wherein the fiber size is: by The fiber content of the 14-mesh sieve is ≤ 10%; the fiber content of the 100-mesh sieve is ≤ 80%; the fiber content of the 100-mesh ≥ 10%.

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 12% flame retardant and 0.8% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 78% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stir and mix for 2 minutes under the condition of 1500r/min; the dosage of MPU-20 polyurethane tree is that the liquid weight accounts for 15% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared in step (3) were also stirred and mixed at a high speed (1500r/min) for 2min on a high-speed digital display mixer, and put it into In the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tools Manufacturing Co., Ltd.), the mixed liquid in the liquid storage tank is sucked by the negative pressure of the high-speed airflow generated when the spray gun is started. Air flow and form a gas/liquid two-phase mixture fluid, and the air flow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 25s of steam at a pressure of 500kPa is introduced from the steam inlet 4, the steam is stopped and kept in the forming area for nearly 25 minutes before being taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 12%.

After testing, the density of the obtained material is 83kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 5.7, the water absorption rate is 0.6%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static cushioning coefficient is 5.87, and there will be 2 yielding phenomena during the static cushioning process, the moisture resistance is 5.4%, and the shrinkage and expansion coefficient is 1.1%.

Example 4

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 99°C until the moisture content of the fiber is 12%; the natural plant fiber is a non-wood straw fiber prepared by the disc grinding method; wherein the fiber size is: The fiber content of the 14 mesh sieve is ≤10%; the fiber content of the 100 mesh passing through the 100 mesh is ≤80%; the fiber content of the 100 mesh passing ≥10%.

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 14% flame retardant and 1.1% preservative accounting for 2.5% dry plant fiber weight, and add water to make solid content Account for the chemical modification solution of 88% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stirring and mixing for 2.5 minutes under the condition of 1800r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 25% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) were similarly carried out high-speed (1800r/min) stirring and mixing for 2.5min on a high-speed digital display mixer, and it was placed after mixing into the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tool Manufacturing Co., Ltd.), and use the high-speed airflow negative pressure effect generated when the spray gun is started to transfer the mixed liquid in the liquid storage tank Inhale the airflow and form a gas/liquid two-phase mixture fluid, and the airflow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 20s of steam with a pressure of 600kPa is introduced from the steam inlet 4, stop the steam and keep it in the forming area for nearly 30 minutes before taking it out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 11%.

After testing, the density of the obtained material is 80kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 5.6, the water absorption rate is 0.4%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static cushioning coefficient is 5.7, and there will be 2 yielding phenomena during the static cushioning process, the moisture resistance is 4.77%, and the shrinkage and expansion coefficient is 0.8%.

Example 5

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fibers are air-dried at 100°C until the moisture content of the fibers is 8%; the natural plant fibers are coniferous pine wood fibers, broad-leaved poplar wood fibers and Non-wood straw fiber (the weight ratio of the above three fibers is 1:2:1); wherein the fiber size is: the fiber content of passing through 14 mesh ≤ 10%; the fiber content of passing 14 mesh but remaining in 100 mesh ≤ 80%; Fiber content ≥ 10% through 100 mesh.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 8% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 65% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stir and mix for 1 min under the condition of 2000r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 30% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) are also stirred and mixed at a high speed (1000r/min) for 3min on a high-speed digital display mixer, and put it into In the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tools Manufacturing Co., Ltd.), the mixed liquid in the liquid storage tank is sucked by the negative pressure of the high-speed airflow generated when the spray gun is started. Air flow and form a gas/liquid two-phase mixture fluid, and the air flow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 30s of steam at a pressure of 400kPa is introduced from the steam inlet 4, after the steam is stopped, it is kept in the forming area for nearly 1min and then taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 13%.

After testing, the density of the obtained material is 82kg/m ³ , the thickness is 51mm, the minimum dynamic cushioning coefficient of the material is 5.3, the water absorption rate is 0.6%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static cushioning coefficient is 6.21, and there will be 2 yielding phenomena during the static cushioning process, the moisture resistance is 5.1%, and the shrinkage and expansion coefficient is 1.1%.

Example 6

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 105°C until the moisture content of the fiber is 8%%; the natural plant fiber is coniferous pine wood fiber prepared by the disc grinding method; wherein the fiber size is: The fiber content of the sieved 14 mesh is ≤ 10%; the fiber content of the 14 mesh but retained in the 100 mesh is ≤ 80%; the fiber content of the 100 mesh is ≥ 10%.

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 11% flame retardant and 1.1% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of total solution weight 77%; Natural plant fiber is the coniferous pine wood fiber that utilizes disc milling method to prepare, broad-leaved poplar wood fiber and non-wood straw fiber (above-mentioned three kinds of fiber weight ratios are 1: 2: 1); wherein the fiber size is: the fiber content of sieving through 14 meshes is ≤ 10%; the fiber content of 14 meshes but retained between 100 meshes is ≤ 80%; the fiber content of 100 meshes is ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 8% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 65% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stir and mix for 2.2min under the condition of 1570r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 24% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) were similarly carried out high-speed (1720r/min) stirring and mixing for 2.5min on a high-speed digital display mixer, and put it after mixing into the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tool Manufacturing Co., Ltd.), and use the high-speed airflow negative pressure effect generated when the spray gun is started to transfer the mixed liquid in the liquid storage tank Inhale the airflow and form a gas/liquid two-phase mixture fluid, and the airflow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 30s of steam at a pressure of 600kPa is introduced from the steam inlet 4, the steam is stopped and kept in the forming area for nearly 5 minutes before being taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 11%.

After testing, the density of the obtained material is 81kg/m ³ , the thickness is 50mm, the minimum dynamic buffer coefficient of the material is 5.7, the water absorption rate is 0.4%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew after 12 months in the room Phenomenon: The static buffer coefficient is 5.54, and there will be 2 yield phenomena during the static buffer process, the moisture resistance is 5.1%, and the shrinkage and expansion coefficient is 1.0%.

Example 7

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 105° C. until the moisture content of the fiber is 8%; the natural plant fiber is a broad-leaved poplar wood fiber prepared by a disc grinding method; wherein the fiber size is: The fiber content of the sieved 14 mesh is ≤ 10%; the fiber content of the 14 mesh but retained in the 100 mesh is ≤ 80%; the fiber content of the 100 mesh is ≥ 10%.

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 11% flame retardant and 0.7% preservative, and add water to form a solid content Account for the chemically modified solution of 69% of total solution weight; Natural plant fiber is the coniferous pine wood fiber, broad-leaved poplar wood fiber and non-wood straw fiber (above-mentioned three kinds of fiber weight ratios are 1: 2: 1); wherein the fiber size is: the fiber content of sieving through 14 meshes is ≤ 10%; the fiber content of 14 meshes but retained between 100 meshes is ≤ 80%; the fiber content of 100 meshes is ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 8% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 65% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stirring and mixing for 2.2 minutes under the condition of 1200r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 24% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) were similarly carried out high-speed (1400r/min) stirring and mixing for 1.5min on a high-speed digital display mixer, and put it out after mixing. into the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tool Manufacturing Co., Ltd.), and use the high-speed airflow negative pressure effect generated when the spray gun is started to transfer the mixed liquid in the liquid storage tank Inhale the airflow and form a gas/liquid two-phase mixture fluid, and the airflow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower injection orifice plate 3, and after 23s of steam at a pressure of 500kPa is introduced from the steam inlet 4, after the steam is stopped, it is kept in the forming area for nearly 17 minutes and then taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 12%.

After testing, the obtained material has a density of 80kg/m ³ , a thickness of 50mm, a minimum dynamic buffer coefficient of 4.5, and a water absorption rate of 0.5%. The flame retardant level is V-1 standard (UL94 standard), and there is no mildew phenomenon after being placed indoors for 12 months; the static buffer coefficient is 5.54, and there will be 2 yields during the static buffer process, the moisture resistance is 4.7%, and the shrinkage and Expansion coefficient 1.3%.

Example 8

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 80°C until the moisture content of the fiber is 9%; the natural plant fiber is coniferous pine wood fiber prepared by the disc grinding method; wherein the fiber size is: The fiber content of the 14-mesh sieve is ≤ 10%; the fiber content of the 100-mesh sieve is ≤ 80%; the fiber content of the 100-mesh ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 15% fire retardant and 1.1% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 88% of total solution weight; Natural plant fiber is the coniferous pine wood fiber that utilizes disc milling method to prepare, broad-leaved poplar wood fiber and non-wood straw fiber (above-mentioned three kinds of fiber weight ratios are 1: 2: 1); wherein the fiber size is: the fiber content of sieving through 14 meshes is ≤ 10%; the fiber content of 14 meshes but retained between 100 meshes is ≤ 80%; the fiber content of 100 meshes is ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 8% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 65% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stirring and mixing for 2.5 minutes under the condition of 1710r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 25% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) carried out high-speed (1200r/min) stirring and mixing for 2.4min on a high-speed digital display mixer, and put it out after mixing. into the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tool Manufacturing Co., Ltd.), and use the high-speed airflow negative pressure effect generated when the spray gun is started to transfer the mixed liquid in the liquid storage tank Inhale the airflow and form a gas/liquid two-phase mixture fluid, and the airflow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 22s of steam at a pressure of 550kPa is introduced from the steam inlet 4, the steam is stopped and kept in the forming area for nearly 24 minutes before being taken out. Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 11%.

After testing, the density of the obtained material is 80kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 3.4, the water absorption rate is 0.8%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static buffer coefficient is 6.45, and there will be 2 yield phenomena during the static buffer process, the moisture resistance is 5.2%, and the shrinkage and expansion coefficient is 1.1%.

Example 9

A method for preparing a green environment-friendly natural fiber cushioning packaging material, comprising the following steps and process conditions:

(1) Fiber drying: the natural plant fiber is air-dried at 105°C until the moisture content of the fiber is 8%; the natural plant fiber is a non-wood straw fiber prepared by a disc grinding method; wherein the fiber size is: The fiber content of the 14 mesh sieve is ≤10%; the fiber content of the 100 mesh passing through the 100 mesh is ≤80%; the fiber content of the 100 mesh passing ≥10%.

(2) Preparation of chemically modified solution: in the mixing tank, add water repellent, 11% fire retardant and 0.9% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of total solution weight 87%; Natural plant fiber is the coniferous pine wood fiber that utilizes disc milling method to prepare, broad-leaved poplar wood fiber and non-wood straw fiber (above-mentioned three kinds of fiber weight ratios are 1: 2: 1); wherein the fiber size is: the fiber content of sieving through 14 meshes is ≤ 10%; the fiber content of 14 meshes but retained between 100 meshes is ≤ 80%; the fiber content of 100 meshes is ≥ 10%.

(2) Preparation of chemical modification solution: in the mixing tank, add water repellent, 8% fire retardant and 1.2% preservative accounting for dry plant fiber weight, and add water to form a solid content Account for the chemical modification solution of 65% of total solution weight; Wherein water repellent is SH-202R type silicon copper water repellent (Zaoyang Sihai Chemical Co., Ltd.), flame retardant is SUNFOR-RDP oligophosphate flame retardant (Yantai Xinxiu Chemical Products Co., Ltd.), the preservative is TST25 Kasong preservative (Guangzhou Tianyuan Chemical Co., Ltd.).

(3) Preparation of foamable MPU-20 polyurethane resin dispersion: use ethyl acetate as a diluent, dilute the MPU-20 polyurethane resin adhesive to 3 times the original volume, and the resulting mixture is rotated on a high-speed digital display mixer. Stir and mix for 2.4min under the condition of 1650r/min; the amount of MPU-20 polyurethane tree is such that the liquid weight accounts for 27% of the dry natural plant fiber weight.

(4) mixing: the plant fiber of step (1) gained is put into LDPE upright type high-pressure resistant polyethylene plastic bag (Jiangyin City Changjing Xinda Plastic Film Co., Ltd.), with the high-speed spray gun as the airflow generating device; (2) The chemically modified solution prepared and the foamable MPU-20 polyurethane resin dispersion liquid prepared by step (3) carried out high-speed (1300r/min) stirring and mixing for 2.7min on a high-speed digital display mixer, and put it after mixing into the liquid storage tank of the high-speed spray gun (PQ-2/PQ-2U-B, Zhejiang Maite Tool Manufacturing Co., Ltd.), and use the high-speed airflow negative pressure effect generated when the spray gun is started to transfer the mixed liquid in the liquid storage tank Inhale the airflow and form a gas/liquid two-phase mixture fluid, and the airflow is mixed with plant fibers in a high-pressure polyethylene plastic bag;

(5) Forming: As shown in Figure 1, first remove or open the upper orifice plate 1, and inject the mixture of fibers, chemical additives and adhesives mixed in step (4) into the material forming area 5, and the lower part of the mixture is as far as possible. It may be evenly paved on the lower spray orifice plate 3, and after 24s of steam at a pressure of 650kPa is introduced from the steam inlet 4, the steam is stopped and kept in the forming area for nearly 22 minutes before being taken out. The heat insulation material 2 is to reduce Due to the heat loss of the steam, the fiber material is formed; after forming, the moisture content of the material is dried and reduced to 12%.

After testing, the density of the obtained material is 80kg/m ³ , the thickness is 50mm, the minimum dynamic cushioning coefficient of the material is 5.1, the water absorption rate is 0.3%, the flame retardant level is V-1 standard (UL94 standard), and there is no mildew when placed indoors for 12 months Phenomenon: The static buffer coefficient is 6.21, and there will be 2 yield phenomena during the static buffer process, the moisture resistance is 3.4%, and the shrinkage and expansion coefficient is 1.3%.

Claims (7)

1. a preparation method for environmental protection Plantfiber buffering package material, is characterized in that comprising the steps and processing condition:

(1) fiber drying: be 8%～13% at air stream drying to fiber moisture by natural plant fibre;

(2) preparation of chemical modification solution: in mixing pit, add and account for the water-resisting agent, 8～15% fire retardant of over dry vegetable fibre weight 1～3% and 0.2～1.2% sanitas as chemical assistant, and add water dilution to be made into the chemical modification solution that chemical assistant solid content accounts for total solution weight 65～90%; Wherein water-resisting agent is SH-202R type copper silicon class water-resisting agent, and fire retardant is SUNFOR-RDP type oligomerization phosphoric fire retardant, and sanitas is TST25 type Kathon CG sanitas;

(3) preparation of foaminess MPU-20 urethane resin dispersion liquid: using ethyl acetate as thinner, to original volume 3-5 mixed solution doubly, gained mixed solution is uniformly mixed by MPU-20 urethane resin gluing dilution agent; The consumption of MPU-20 urethane resin be described mixed solution account for over dry natural plant fibre weight 10～30%;

(4) mix: after foaminess MPU-20 urethane resin dispersion liquid prepared by chemical modification solution prepared by step (2) and step (3) is uniformly mixed, put into the receiver of high-velocity jet rifle, the vegetable fibre of step (1) gained is put into high pressure resistant polyethylene plastic bag; Take spray gun as air-stream generating device, the high velocity air suction function producing while utilizing spray gun to start, mixed solution in described receiver is sucked to air-flow and forms gas/liquid biphasic mixture fluid, and air-flow mixes with vegetable fibre in high pressure resistant polyethylene plastic bag;

(5) moulding: first the up-hole plate of former is unloaded or opened, by step (4) gained mixture injecting material shaping district, under mixture, position uniform spreading is contained on lower injection orifice plate, from steam-in, pass into after the water vapor 20～30s of 400～700kPa pressure, stop passing into steam, after mixture being continued in shaping district to retain 1～30min, take out, the material water ratio after taking out is dried and is reduced to 10～13%.

2. the preparation method of environmental protection Plantfiber buffering package material according to claim 1, is characterized in that: described natural plant fibre is one or more in needle pine lumber fibre, broad-leaved poplar lumber fibre and non-timber rice-straw fibre.

3. the preparation method of environmental protection Plantfiber buffering package material according to claim 1, is characterized in that: described in to be dried to fiber moisture be 8%～13%, by the air stream drying of 60 ℃～105 ℃.

4. the preparation method of environmental protection Plantfiber buffering package material according to claim 1, it is characterized in that: it is on high speed digital display stirrer that the mixed solution of described step (3) is uniformly mixed, and at rotating speed, is to be uniformly mixed 1～3min under 1000～2000r/min condition.

5. the preparation method of environmental protection Plantfiber buffering package material according to claim 1, is characterized in that: being uniformly mixed in described step (4) is on high speed digital display stirrer, to carry out 1000～2000r/min to be uniformly mixed 1～3min.

6. the preparation method of environmental protection Plantfiber buffering package material according to claim 1, is characterized in that: the former in described step (4), comprises up-hole plate, lagging material, lower injection orifice plate, high temperature pressure steam-in and forming cavity; Forming cavity upper end is provided with up-hole plate, and lower end is provided with lower injection orifice plate, and lower injection orifice plate is provided with a plurality of high temperature pressures steam-in, and forming cavity periphery is provided with lagging material.

7. an environmental protection Plantfiber buffering package material, is characterized in that: in method described in claim 1-6 prepared by any one; The network structure of described environmental protection Plantfiber buffering package material for being formed by vegetable fibre, the density≤100kg/m of this material ³, thickness>=30mm, water-intake rate≤0.5%; Fire-retardant rank is V-1 standard, indoor placement 12 months without mildew phenomena; The minimum dynamic buffering of material coefficient>=6.0, static buffering coefficient>=4.0, in static buffering process, there is yield phenomenon 2 times in material.

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