CN108276691A - One kind material of inner container of icebox containing low volatile organic and preparation method thereof - Google Patents

Abstract

The invention provides a refrigerator liner material containing low volatile organic compounds and a preparation method thereof. In parts by mass, the liner material is prepared from the following raw material components: 90-110 parts of resin; 30-40 parts of filler; 6-8 parts of plasticizer; 1-2 parts of lubricant; 4-6 parts of color masterbatch; 0.5-2 parts of devolatilizer. During the preparation process, the devolatile agent extracts the volatile organic compounds in the resin, and vacuumizes the volatile organic compounds to prepare the liner material containing low volatile organic compounds. When users use a new refrigerator, the content of volatile organic compounds has been greatly reduced, and it will have little or no impact on human health during long-term use.

Description

A kind of refrigerator liner material containing low volatile organic compounds and its preparation method

technical field

The invention relates to a refrigerator liner material, in particular to a refrigerator liner material containing low volatile organic matter and a preparation method thereof.

Background technique

In modern life, refrigerators have become an indispensable part of people's lives. In real life, when users open a new refrigerator, they will smell a peculiar smell. The main reason for these peculiar smells is that many rubber or plastic parts made of organic polymer materials are used in the refrigerator. These polymer materials contain Volatile organic compounds, these volatile organic compounds will not only pollute the storage in the refrigerator, but also cause different degrees of damage to the human body if exposed to them for a long time.

In the prior art, the method for reducing volatile organic compounds in the refrigerator is usually to add porous nano-adsorbent materials in the refrigerator, and reduce the concentration of volatile organic compounds in the refrigerator through physical adsorption of the adsorbent materials. However, the volatile organic compounds in the polymer material are slow-released, and the slow-release time lasts for several years, and as the ambient temperature rises, the release of volatile organic compounds will increase. No matter how much the adsorption capacity of the built-in adsorption material is Strong adsorption saturation and deactivation will occur.

Contents of the invention

One object of the present invention is to provide a refrigerator liner material containing low volatile organic compounds.

A further object of the present invention is to directly add a devolatilizer during the preparation process of the refrigerator liner material, thereby reducing the volatile organic compounds in the liner material.

Another object of the present invention is to provide a method for preparing a refrigerator liner material containing low volatile organic compounds, which can easily and efficiently remove volatile organic compounds in the liner material.

In particular, the present invention provides a refrigerator liner material containing low volatile organic compounds. In terms of parts by mass, the liner material is prepared from the following raw material components:

90-110 parts of resin;

30-40 parts of filler;

6-8 parts of plasticizer;

1 to 2 parts of lubricant;

4 to 6 parts of color masterbatch;

0.5-2 parts of devolatilizer.

Preferably, the resin is polystyrene resin with a molecular weight of 200,000-300,000.

Preferably, the filler is calcium carbonate; the plasticizer is stearic acid; the lubricant is zinc oxide; the color masterbatch includes titanium dioxide and polystyrene resin carrier.

Preferably, the devolatilizer is a mixture of silicate, 1,3,5-triisopropylbenzene and diethylene glycol butyl ether.

Preferably, in terms of mass percentage, the water content in the liner material is less than 0.05%.

The present invention also provides a method for preparing refrigerator liner material, comprising:

Raw material components resin, filler, plasticizer, lubricant, color masterbatch and devolatilizer are mixed in proportion;

The mixed raw material components are heated to a molten state, and the volatile organic compounds released by the polystyrene resin are miscible with the devolatilizer, and form gasification after heating;

Vacuum treatment, after the gasification is extracted, it forms a refrigerator liner material containing low volatile organic compounds.

Preferably, the device used to realize the preparation method includes an extruder body, and the extruder body includes a compression section, a homogenization section and an extrusion section; For melting, the extrusion section is used to shape and extrude the raw material components in the molten state; a vacuum adsorption device is installed at the end of the extrusion section to extract the gaseous substances released from the raw material components.

Preferably, the compression section mixes, compresses and propels the raw material components at a temperature of 100-170°C.

Preferably, the melting temperature of the raw material components in the homogenization section is 220-230°C.

Preferably, the temperature of the extrusion section is 175-210°C.

Preferably, the vacuum degree of the vacuum adsorption device is 0.08-0.09 MPa.

The refrigerator liner material provided by the invention has a devolatilizer added in the preparation process of the liner material, so the volatile organic content of the refrigerator liner material provided by the invention is low, and it can be directly used to make refrigerator liners. When the refrigerator is new, the content of volatile organic compounds has been greatly reduced, and it will have little or no impact on human health during long-term use.

Further, the present invention also provides a method for preparing the refrigerator liner material. The raw material components are mixed, heated and melted, so that the volatile organic compounds released from the polystyrene resin and the devolatilizer are mutually soluble, and vaporized products are formed after heating, and then vacuumized treatment to extract volatile organic compounds, and the refrigerator liner material prepared by the method greatly reduces the content of volatile organic compounds.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is the schematic flow sheet of the preparation method of refrigerator liner material of the present invention;

Fig. 2 is a schematic diagram of the preparation device of the refrigerator liner material of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The invention provides a refrigerator liner material containing low volatile organic compounds. The liner material is prepared from the following raw material components in parts by mass:

90-110 parts of resin;

30-40 parts of filler;

6-8 parts of plasticizer;

1 to 2 parts of lubricant;

4 to 6 parts of color masterbatch;

0.5-2 parts of devolatilizer.

Specifically, the resin raw material is polystyrene resin, polystyrene (PS) resin is a relatively old plastic, and the production process has been relatively perfect. Compared with other resins, PS has the characteristics of good transparency (light transmittance 88%-92%) and surface gloss, easy dyeing, high hardness, good rigidity, in addition, good water resistance, chemical resistance Corrosion and machining fluidity. Its main disadvantages are: brittle and easy to crack, low impact strength, prone to stress cracking, poor heat resistance, etc.

Aiming at the disadvantages of the above-mentioned polystyrene resin, the present invention adds additives such as fillers, plasticizers, lubricants, and color masterbatches to obtain refrigerator liner materials with better performance.

Among them, calcium carbonate is used as the filler, which can not only enhance the impact strength of the refrigerator liner material, but also reduce the cost of the formula.

The plasticizer uses stearic acid, which is used as a cold-resistant plasticizer for plastics to increase the plasticity, flexibility, stretchability or expansion of polystyrene resin; adding plasticizers can reduce the melt viscosity, glass transition temperature and elastomeric properties of plastics. Modulus of elasticity, change its mechanical properties, and avoid cracks in the prepared refrigerator liner.

Zinc oxide is used as the lubricant, and zinc oxide is added to reduce the cohesive force between polymer molecules inside the polystyrene resin, thereby improving the internal friction heat generation of the polystyrene resin and the fluidity of the melt.

Color masterbatch adopts white color masterbatch, because the resin raw material among the present invention is polystyrene resin, therefore comprises titanium dioxide and polystyrene resin carrier in its color masterbatch.

Furthermore, in the present invention, a devolatilizer is added to the raw material, and the devolatilizer is a mixture of silicate, 1,3,5-triisopropylbenzene and diethylene glycol butyl ether. Wherein the silicate is used as the carrier of the extractant in the devolatilization agent, so that the mixture of the extractant 1,3,5-triisopropylbenzene and diethylene glycol butyl ether is more uniformly dispersed in the raw material component, when the raw material When the components are heated and melted, the extractant is liquefied and vaporized and dispersed evenly in the raw material components, and the volatile organic compounds contained in the polystyrene resin in the raw material are extracted by the extractant, forming an azeotropic mixture with the extractant.

Especially, in the whole raw material component mixture, the mass content of water is less than 0.05%. If the water content in the raw material component exceeds the standard, then in the process of high temperature melting of the raw material component, the water in the process of preparing the refrigerator liner material If it is vaporized, a large number of macropore defects will appear, so that the prepared refrigerator liner material cannot be further used in the manufacture of refrigerator liners, and raw materials are wasted.

The present invention also provides a method for preparing a refrigerator liner material containing low volatile organic compounds, and FIG. 1 is a schematic flow chart of the preparation method.

Step S102: mixing raw material components

Raw material components polystyrene resin, filler, plasticizer, lubricant, color masterbatch and devolatilizer are mixed in proportion; during the raw material mixing process, the mixing temperature is 100-170°C;

Step S104: Melting the raw material components

The mixed raw material components are mixed and heated to a molten state, and the heating temperature is 220-230 ° C. During the melting process, the volatile organic compounds in the polystyrene resin are released, and the extractant in the devolatilizer1,3 , 5-triisopropylbenzene and diethylene glycol butyl ether are miscible, and during continuous heating, the miscibles form gasification;

Step S106: Vacuumizing

After the gasification is vacuumized, the gasification is extracted to form a refrigerator liner material containing low volatile organic compounds.

Further, the present invention also provides a device for preparing the refrigerator liner material, as shown in Figure 2, the device is an improvement on the extruder in the prior art, including the extruder body, the extruder body Comprising a compression section 110, a homogenization section 120 and an extrusion section 130; the compression section 110 is used for mixing compression and propelling the raw material components, the raw material components are melted in the homogenization section 120, and the extrusion section 130 is used for The raw material components are molded and extruded; a vacuum adsorption device 131 is provided at the end of the extrusion section 130 for extracting gaseous substances released from the raw material components.

Specifically, in the compression section 110, a feed hopper 111 is arranged on the upper part thereof, and the raw material components are injected into the extruder body in proportion through the feed hopper 111, and after being extruded by a single screw, under the action of shear force and high temperature In this case, the extractant in the devolatilizer is liquefied first, and the temperature in the compression section 110 is 100-170°C.

Then, through the compression and propulsion of the single screw, the heated raw material components are transported to the homogenization section 120. The temperature of the homogenization section 120 is 220-230°C. At this temperature, further mixing is carried out in the homogenization section 120. The raw material components reach a molten state. At this time, the resin in the raw material components melts and releases small molecules of volatile organic compounds with a boiling point of 50-220 ° C. The volatile organic compounds and the liquefied extractant extract and dissolve each other to form an azeotropic mixture. Forms fine vapors.

Finally, the vacuum adsorption device 131 located at the end of the extrusion section 130 undergoes vacuum treatment when the raw material components are formed through the extrusion section 130. The temperature of the outlet section 130 is 175-210° C., and finally the refrigerator liner material containing low volatile organic compounds is obtained from the extrusion section 130 of the extruder.

Further, the processing technology when the extruder is working is as follows:

1) Screw diameter: 80~90mm;

2) Length-to-diameter ratio: L/D=25;

3) Maximum speed: 125rpm;

4) Maximum pressure: 850Bar;

5) Motor power: 75~90KW;

6) Extrusion capacity: 300~400kg/h;

7) Processing temperature: raw material section: room temperature; compression section: 100-170°C; homogenization section: 220-230°C; extrusion section: 175-210°C;

Example 1

The raw material components and mass parts thereof of this embodiment are as follows:

90 parts of polystyrene resin;

30 parts of calcium carbonate;

6 parts of stearic acid;

1 part of zinc oxide;

4 parts of titanium dioxide and polystyrene resin carrier;

Silicate, 1,3,5-triisopropylbenzene and 0.5 parts of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 140 °C, and the extraction agent in the devolatilization agent 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the compressed and propelled mixed materials reach the homogenization section 120, and the homogenization section 120 reaches the melting of polystyrene resin Temperature, the temperature is 225°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220°C, the volatile organic compounds are extracted and miscible with the extractant in the liquefied devolatilization agent and vaporized by heating to form tiny gasified compounds , A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the extruder body, the vacuum degree is 0.09MPa, and the tiny vaporized substances are evacuated and discharged, finally forming a refrigerator liner material containing low volatile organic compounds.

Example 2

The raw material components and mass parts thereof of this embodiment are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

6 parts of titanium dioxide and polystyrene resin carrier;

Silicate, 1,3,5-triisopropylbenzene and 2 parts of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 140 °C, and the extraction agent in the devolatilization agent 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the compressed and propelled mixed materials reach the homogenization section 120, and the homogenization section 120 reaches the melting of polystyrene resin Temperature, the temperature is 225°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220°C, the volatile organic compounds are extracted and miscible with the extractant in the liquefied devolatilization agent and vaporized by heating to form tiny gasified compounds , A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the extruder body, the vacuum degree is 0.09MPa, and the tiny vaporized substances are evacuated and discharged, finally forming a refrigerator liner material containing low volatile organic compounds.

Example 3

The raw material components and mass parts thereof of this embodiment are as follows:

100 parts of polystyrene resin;

35 parts of calcium carbonate;

7 parts of stearic acid;

1.5 parts of zinc oxide;

5 parts of titanium dioxide and polystyrene resin carrier;

Silicate, 1,3,5-triisopropylbenzene and 1.5 parts of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 140 °C, and the extraction agent in the devolatilization agent 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the compressed and propelled mixed materials reach the homogenization section 120, and the homogenization section 120 reaches the melting of polystyrene resin Temperature, the temperature is 225°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220°C, the volatile organic compounds are extracted and miscible with the extractant in the liquefied devolatilization agent and vaporized by heating to form tiny gasified compounds , A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the extruder body, the vacuum degree is 0.09MPa, and the tiny vaporized substances are evacuated and discharged, finally forming a refrigerator liner material containing low volatile organic compounds.

Example 4

The raw material components and mass parts thereof of this embodiment are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

6 parts of titanium dioxide and polystyrene resin carrier;

Silicate, 1,3,5-triisopropylbenzene and 2 parts of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 100°C, and the extractant in the devolatilization agent 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the compressed and propelled mixed materials reach the homogenization section 120, and the homogenization section 120 reaches the melting of polystyrene resin Temperature, the temperature is 220°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220°C, the volatile organic compounds are extracted and miscible with the extractant in the liquefied devolatilization agent, and are heated and vaporized to form tiny gasified compounds , A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the extruder body, the vacuum degree is 0.08-0.09MPa, and the tiny vaporized substances are evacuated to form a refrigerator liner material containing low volatile organic compounds.

Example 5

The raw material components and mass parts thereof of this embodiment are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

6 parts of titanium dioxide and polystyrene resin carrier;

Silicate, 1,3,5-triisopropylbenzene and 2 parts of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 170°C, and the extractant in the devolatilization agent 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the compressed and propelled mixed materials reach the homogenization section 120, and the homogenization section 120 reaches the melting of polystyrene resin Temperature, the temperature is 230°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220°C, the volatile organic compounds are extracted and miscible with the extractant in the liquefied devolatilizer and vaporized by heat to form tiny gasified compounds , A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the extruder body, the vacuum degree is 0.09MPa, and the tiny vaporized substances are evacuated and discharged, finally forming a refrigerator liner material containing low volatile organic compounds.

comparative example

The raw material components and mass parts thereof of this comparative example are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

6 parts of titanium dioxide and polystyrene resin carrier.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion through the feed hopper 111 and then injected into the extruder body. Due to shearing and high temperature in the compression section 110 of the extruder body, the temperature is 140°C; Compress and push the mixed material to reach the homogenization section 120, and the homogenization section 120 reaches the melting temperature of polystyrene resin. A vacuum adsorption device 131 is installed at the end of the extruding section 130 of the extruder body, the vacuum degree is 0.09MPa, the volatile organic compounds are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

The devolatilization rate of the refrigerator liner material detection that above-mentioned embodiment makes is shown in the table below:

Example Example 1 Example 2 Example 3 Example 4 Example 5 comparative example Devolatilization rate 75% 80% 78% 76% 80% 40%

From the analysis of the test results in the above table, it can be seen that compared with Examples 1-3, under the same processing parameters, the main influencing factors of the devolatilization rate are the ratio of the devolatilizer and the resin in the raw material components, the ratio of the devolatilizer and the resin. When the ratio of the resin is appropriate, the devolatilizer will extract as much volatile organic compounds contained in the resin as possible. Further, the comparison of Examples 2, 4 and 5 shows that under the same raw material components, the change of processing parameters has little influence on the devolatilization rate, but in Example 4, due to the compression section 110 temperature relative to Example 2 and 5 are low, resulting in the viscosity of the raw material components in the compression section 110 being too high, and the mixing is not uniform enough, which affects the devolatilization in the subsequent process, and then affects the devolatilization rate.

Finally, in the blank example, no devolatilization agent is added, and other processing parameters are the same, and vacuum treatment is also carried out in the extrusion section 130, but the devolatilization rate of the refrigerator liner material obtained is not ideal, so in this paper In the refrigerator liner material containing low volatile organic compounds provided by the invention, the devolatilizer is the key component.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (11)

1. a kind of material of inner container of icebox containing low volatile organic, according to the mass fraction, the liner material is by following raw material group Divide and is prepared：

90~110 parts of resin；

30~40 parts of filler；

6~8 parts of plasticizer；

1~2 part of lubricant；

4~6 parts of color masterbatch；

0.5~2 part of devolatilization agent.

2. liner material according to claim 1, wherein

The resin is polystyrene resin, and molecular weight is 20~300,000.

3. liner material according to claim 1, wherein

The filler is calcium carbonate；The plasticizer is stearic acid；The lubricant is zinc oxide；The color masterbatch includes titanium white Powder and polystyrene resin carrier.

4. liner material according to claim 1, wherein

The devolatilization agent is the mixture of silicate, 1,3,5- triisopropylbenzenes and butyl.

5. liner material according to claim 1, wherein

By mass percentage, water content is less than 0.05% in the liner material.

6. a kind of method preparing any one of claim 1 to 5 liner material, including：

The raw material components resin, filler, plasticizer, lubricant, color masterbatch and devolatilization agent mix in proportion；

The mixed raw material components heating is in molten condition, the volatile organic matter of the polystyrene resin release and institute It states devolatilization agent to dissolve each other, forms vapour after heating；

Vacuumize process, the vapour form the material of inner container of icebox containing low volatile organic after being pulled out.

7. preparation method according to claim 6, wherein

Realize that the device of the preparation method includes extruder ontology, the extruder ontology include compression section, homogenizing zone and Extruding zone；For mixing compression and promoting the raw material components, the raw material components are carried out in the homogenizing zone for the compression section Melting, the extruding zone are used to the raw material components under molten condition being molded and squeeze out；It is arranged in the end of the extruding zone There is vacuum absorption device, for extracting the gaseous matter discharged in the raw material components out.

8. preparation method according to claim 7, wherein

It is 100~170 DEG C that the raw material components, temperature are compressed and promoted in the compression section mixing.

9. preparation method according to claim 7, wherein

It is 220~230 DEG C that the raw material components carry out melting temperature in the homogenizing zone.

10. preparation method according to claim 7, wherein

The temperature of the extruding zone is 175~210 DEG C.

11. preparation method according to claim 7, wherein

The vacuum degree of the vacuum absorption device is 0.08~0.09MPa.