CN108276691B - A kind of refrigerator liner material containing low volatile organic matter and preparation method thereof - Google Patents

Abstract

The invention provides a refrigerator liner material containing low-volatility organic compounds and a preparation method thereof, wherein the liner material is prepared from the following raw materials in parts by mass: 90-110 parts of resin; 30-40 parts of a filler; 6-8 parts of a plasticizer; 1-2 parts of a lubricant; 4-6 parts of color master batch; 0.5-2 parts of devolatilizing agent. In the preparation process, the volatile organic compounds in the resin are extracted by the devolatilization agent, and the liner material containing the low-volatile organic compounds is prepared by vacuumizing and pumping the volatile organic compounds. When a user uses the new refrigerator, the content of volatile organic compounds of the refrigerator is greatly reduced, and the refrigerator has little or no influence on the health of a human body in a long-term use process.

Description

A kind of refrigerator liner material containing low volatile organic matter and preparation method thereof

technical field

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

Background technique

In modern life, refrigerators have become an indispensable part of people's lives. In real life, users will smell an odor when opening a new refrigerator. The main reason for these odors 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 contaminate the storage in the refrigerator, but also cause different degrees of harm to the human body when exposed to it for a long time.

In the prior art, a method for reducing volatile organic compounds in a refrigerator is usually to add porous nano-adsorbent materials in the refrigerator, and reduce the concentration of volatile organic compounds in the refrigerator through the physical adsorption of the adsorbent materials. However, the volatile organic compounds in the polymer materials are slow-released, and the slow-release time can last for several years, and with the increase of the ambient temperature, the release of volatile organic compounds will increase. The phenomenon of adsorption saturation and then deactivation will occur.

SUMMARY OF THE INVENTION

An 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 in the preparation process of the liner material of the refrigerator, 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 simply and efficiently remove volatile organic compounds in the liner material.

In particular, the present invention provides a low-volatile organic matter-containing refrigerator liner material, and in parts by mass, the liner material is prepared from the following raw material components:

90-110 parts of resin;

30 to 40 parts of filler;

6 to 8 parts of plasticizer;

1 to 2 parts of lubricant;

4-6 copies of color masterbatch;

Devolatilizer 0.5 to 2 parts.

Preferably, the resin is polystyrene resin with a molecular weight of 200,000 to 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 a polystyrene resin carrier.

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

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

The present invention also provides a method for preparing a 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, the volatile organic compounds released by the polystyrene resin and the devolatilizer are mutually soluble, and gaseous compounds are formed after heating;

Vacuum treatment, the vapors are evacuated to form the refrigerator liner material containing low volatile organic compounds.

Preferably, the device for realizing the preparation method includes an extruder body, and the extruder body includes a compression section, a homogenization section and an extrusion section; the compression section is used for mixing, compressing and advancing the raw material components, and the raw material components are in the homogenization 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 arranged 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 pushes the raw material components, and the temperature is 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.

In the refrigerator liner material provided by the present invention, since a devolatilizer is added in the preparation process of the liner material, the content of volatile organic compounds in the refrigerator liner material provided by the present invention is relatively low, and it is directly used for making the refrigerator liner, and the user can use it. When the refrigerator is new, the content of volatile organic compounds has been greatly reduced, and it has little or no impact on human health during long-term use.

Further, the present invention also provides a method for preparing a refrigerator liner material. The raw material components are mixed, heated and melted, so that the volatile organic compounds released by the polystyrene resin and the devolatilizer are mutually dissolved, and after heating, gaseous compounds are formed, and then vacuumized. treatment, extracting volatile organic compounds, and the content of volatile organic compounds in the refrigerator liner material prepared by the method is greatly reduced.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the 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 example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

Fig. 1 is the schematic flow sheet of the preparation method of the 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 following describes the technical solutions of the present invention in a clear and complete manner with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention provides a low-volatile organic matter-containing refrigerator liner material, which is prepared from the following raw material components in parts by mass:

90-110 parts of resin;

30 to 40 parts of filler;

6 to 8 parts of plasticizer;

1 to 2 parts of lubricant;

4-6 copies of color masterbatch;

Devolatilizer 0.5 to 2 parts.

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

Aiming at the shortcomings of the above-mentioned polystyrene resin, the present invention adds fillers, plasticizers, lubricants, color masterbatches and other auxiliary agents 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, as a plastic cold-resistant plasticizer, to increase the plasticity, flexibility, stretchability or expansion of polystyrene resin; adding plasticizer can reduce the melt viscosity, glass transition temperature and elastomer of plastic. The elastic modulus, 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 effect of the cohesive force of the polymer molecules inside the polystyrene resin, thereby improving the internal frictional heat generation and the fluidity of the melt of the polystyrene resin.

The color masterbatch adopts a white color masterbatch, because the resin raw material in the present invention is a polystyrene resin, so the color masterbatch includes titanium dioxide and a polystyrene resin carrier.

Further, 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. The silicate is used as the carrier of the extractant in the devolatilizer, so that the mixture of the extractant 1,3,5-triisopropylbenzene and diethylene glycol butyl ether is more uniformly dispersed in the raw material components. When the components are heated and melted, the extractant is liquefied and vaporized and evenly dispersed in the raw material components, and the volatile organic compounds contained in the polystyrene resin in the raw material are extracted by the extractant and form an azeotropic mixture with the extractant.

In particular, in the entire 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 during the high temperature melting of the raw material component, the water in the process of preparing the refrigerator liner material If it is vaporized, there will be a large number of defects of large pores, so that the prepared refrigerator liner material cannot be further used in the manufacture of refrigerator liner, 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 flowchart of the preparation method.

Step S102: mixing of raw material components

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

Step S104: melting of raw material components

The mixed raw material components are mixed and heated to be in a molten state, wherein the heating temperature is 220-230 ° C. During the melting process, the volatile organic compounds in the polystyrene resin are released, and the extractant 1,3 in the devolatilizer is released. ,5-triisopropylbenzene and diethylene glycol butyl ether are mutually soluble, and in the process of continuous heating, the miscible matter forms vapor;

Step S106: vacuum treatment

The vaporized matter is vacuumed, and the vaporized matter is evacuated to form a refrigerator liner material containing low volatile organic compounds.

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

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

Then, through the compression and advancement of the single screw, the heated raw material components are transported to the homogenization section 120, and 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 component reaches a molten state, and the resin in the raw material component melts to release small volatile organic molecules with a boiling point of 50 to 220 °C, and the volatile organic compounds and the liquefied extractant are extracted and dissolved to form an azeotropic mixture, and the azeotropic mixture is further Form tiny vapors.

Finally, the vacuum adsorption device 131 located at the end of the extrusion section 130 is subjected to vacuum treatment when the raw material components are formed through the extrusion section 130. The vacuum degree at this time is 0.08-0.09 MPa, and the tiny vapors are evacuated and extruded. The temperature of the exit section 130 is 175-210° C., and finally a refrigerator inner liner material containing low volatile organic compounds is obtained from the extrusion section 130 of the extruder.

Further, the processing technology of the extruder is as follows:

1) Screw diameter: 80～90mm;

2) Aspect 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 of this embodiment and their mass fractions 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 part of diethylene glycol butyl ether.

The production process is as follows:

The above-mentioned raw material components are mixed in proportion by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 140 ° C, and the extractant in the devolatilizer is 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the mixed material is compressed and propelled by the screw to reach the homogenization section 120, and the homogenization section 120 reaches the melting of the polystyrene resin. Temperature, the temperature is 225 ℃, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220 ℃, the volatile organic compounds and the liquefied devolatilizer are extracted and dissolved by the extractant and heated to vaporize to form tiny vapors , 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, the tiny vapors are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

Example 2

The raw material components of this embodiment and their mass fractions are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

Titanium dioxide and polystyrene resin carrier 6 parts;

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

The production process is as follows:

The above-mentioned raw material components are mixed in proportion by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 140 ° C, and the extractant in the devolatilizer is 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the mixed material is compressed and propelled by the screw to reach the homogenization section 120, and the homogenization section 120 reaches the melting of the polystyrene resin. Temperature, the temperature is 225 °C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50 to 220 °C. The volatile organic compounds and the liquefied devolatilizer are extracted and dissolved in each other and vaporized by heating to form tiny vapors. , 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, the tiny vapors are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

Example 3

The raw material components of this embodiment and their mass fractions 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 by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 140 ° C, and the extractant in the devolatilizer is 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the mixed material is compressed and propelled by the screw to reach the homogenization section 120, and the homogenization section 120 reaches the melting of the polystyrene resin. Temperature, the temperature is 225 ℃, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50-220 ℃, the volatile organic compounds and the liquefied devolatilizer are extracted and dissolved by the extractant and heated to vaporize to form tiny vapors , 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, the tiny vapors are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

Example 4

The raw material components of this embodiment and their mass fractions are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

Titanium dioxide and polystyrene resin carrier 6 parts;

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

The production process is as follows:

The above-mentioned raw material components are mixed in proportion by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 100 ° C, and the extractant in the devolatilizer 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the mixed material is compressed and propelled by the screw to reach the homogenization section 120, and the homogenization section 120 reaches the melting of the 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 and the liquefied devolatilizer are extracted and dissolved in each other and vaporized by heating to form tiny vapors. , 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, the tiny vapors are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

Example 5

The raw material components of this embodiment and their mass fractions are as follows:

110 parts of polystyrene resin;

40 parts of calcium carbonate;

8 parts of stearic acid;

2 parts of zinc oxide;

Titanium dioxide and polystyrene resin carrier 6 parts;

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

The production process is as follows:

The above-mentioned raw material components are mixed in proportion by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 170 ° C, and the extractant in the devolatilizer is 1, 3,5-triisopropylbenzene and diethylene glycol butyl ether are first liquefied; further, in the compression section 110, the mixed material is compressed and propelled by the screw to reach the homogenization section 120, and the homogenization section 120 reaches the melting of the 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 and the liquefied devolatilizer are extracted and dissolved in the extractant and heated to vaporize to form tiny vapors. , 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, the tiny vapors are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

Comparative ratio

The raw material components of this comparative example and their mass fractions 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 by the feeding hopper 111 and then injected into the extruder body. In the compression section 110 of the extruder body, due to shearing and high temperature, the temperature is 140 ° C; Compress and push the mixed material to reach the homogenization section 120, the homogenization section 120 reaches the melting temperature of the polystyrene resin, the temperature is 225°C, the polystyrene resin melts and releases volatile organic compounds with a boiling point of 50 to 220°C, which are extruded during extrusion. A vacuum adsorption device 131 is installed at the end of the extrusion section 130 of the machine body, the vacuum degree is 0.09MPa, and the volatile organic compounds are evacuated and discharged, and finally a refrigerator liner material containing low volatile organic compounds is formed.

The devolatilization rate that the refrigerator liner material that above-mentioned embodiment makes detects is as shown in the following table:

Example Example 1 Example 2 Example 3 Example 4 Example 5 Comparative ratio Devolatilization rate 75% 80% 78% 76% 80% 40%

From the analysis of the test results in the above table, it can be seen that the comparison of Examples 1 to 3 shows that under the same processing parameters, the main influencing factor of the devolatilization rate is the proportional relationship between the devolatilizer and the resin in the raw material components. With the proper proportion of resin, the devolatilizer will extract as much volatile organic compounds contained in the resin as possible. Further, comparing Examples 2, 4 and 5, when the raw material components are the same, the change of the processing parameters has little effect on the devolatilization rate, but in Example 4, because the temperature of the compression section 110 is relative to and 5 are low, resulting in the viscosity of the raw material components in the compression section 110 being too large, and the mixing is not uniform enough, which affects the devolatilization in the subsequent process, thereby affecting the devolatilization rate.

Finally, in the blank example, no devolatilizer was added, and other processing parameters were the same, and the extrusion section 130 was also used for vacuum treatment, but the devolatilization rate of the obtained refrigerator liner material was not ideal. Therefore, in this case In the low-volatile organic matter-containing refrigerator liner material provided by the invention, a devolatilizer is a key component thereof.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. The refrigerator liner material containing low-volatility organic matter is prepared from the following raw materials in parts by weight:

90-110 parts of resin;

30-40 parts of a filler;

6-8 parts of a plasticizer;

1-2 parts of a lubricant;

4-6 parts of color master batch;

0.5-2 parts of a devolatilization agent, wherein the devolatilization agent is a mixture of silicate, 1,3, 5-triisopropylbenzene and diethylene glycol butyl ether.

2. The liner material according to claim 1,

the resin is polystyrene resin, and the molecular weight of the resin is 20-30 ten thousand.

3. The liner material according to claim 1,

the filler is calcium carbonate; the plasticizer is stearic acid; the lubricant is zinc oxide; the color master batch comprises titanium dioxide and a polystyrene resin carrier.

4. The liner material according to claim 1,

the water content in the liner material is less than 0.05 percent by mass.

5. A method of making the bladder material of any of claims 1 to 4 comprising:

the raw material components of resin, filler, plasticizer, lubricant, color masterbatch and devolatilization agent are mixed according to a proportion;

heating the mixed raw material components to be in a molten state, mutually dissolving volatile organic matters released by the resin and the devolatilizing agent, and heating to form a vapor;

and (4) performing vacuum pumping treatment, wherein the vapor is pumped out to form a refrigerator liner material containing low-volatility organic matters.

6. The production method according to claim 5,

the device for realizing the preparation method comprises an extruder body, wherein the extruder body comprises a compression section, a homogenization section and an extrusion section; the compression section is used for mixing, compressing and propelling the raw material components, the raw material components are melted in the homogenization section, and the extrusion section is used for molding and extruding the raw material components in a molten state; and a vacuum adsorption device is arranged at the tail end of the extrusion section and is used for pumping out gas substances released from the raw material components.

7. The production method according to claim 6, wherein,

the compression section mixes and compresses and propels the raw material components at the temperature of 100-170 ℃.

8. The production method according to claim 6, wherein,

the melting temperature of the raw material components in the homogenizing section is 220-230 ℃.

9. The production method according to claim 6, wherein,

the temperature of the extrusion section is 175-210 ℃.

10. The production method according to claim 6, wherein,

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

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