CN104448772A - Composite material for household appliance shell - Google Patents

Abstract

The invention belongs to the field of material processing, and specifically discloses a composite material used for housings of household appliances, which is prepared from the following raw materials: lithium-based bentonite, antimony trioxide, borax, talcum powder, white carbon black, silicon carbide, Polybenzimidazole, ethylene octene copolymer, polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, polyvinyl alcohol, low-density polyethylene, and polyphenylene ether resin. The household appliance shell composite material prepared by the invention has good mechanical properties and thermal conductivity, good fire resistance and insulation performance, is not easily deformed under high temperature, has long service life and high safety performance.

Description

A kind of composite material used for household appliance housing

technical field

The invention belongs to the field of plastic material processing, and in particular relates to a composite material used for housings of household appliances.

Background technique

Household appliances mainly refer to various electrical and electronic appliances used in homes and similar places. Also known as civil appliances, household appliances. Commonly used household appliances mainly include televisions, air conditioners, and refrigerators. Housings of household appliances are mostly made of synthetic plastics, mainly including resin materials and PC plastics. The impact-resistant polystyrene material has the characteristics of excellent mechanical properties and good processing properties, and is especially suitable for those applications that require high comprehensive performance, cost control and high cost performance. At present, the rear casing material of the TV industry is mainly HIPS material. However, when large-sized products are injected, the product will shrink and warp, especially when the temperature difference between winter and summer is large, the uneven size of the product will be more obvious, which will affect the assembly of the whole machine. PC is an amorphous engineering plastic with excellent impact strength, thermal stability, gloss, antibacterial properties, flame retardant properties and anti-pollution properties. However, due to its high molecular rigidity and steric hindrance, its high melting temperature (220--230 ° C) is difficult to process, and it is difficult to produce large thin-walled products, and the residual stress in the product is large, and stress cracking is prone to occur. How to develop a housing material for household electrical appliances with good mechanical properties, no deformation, resistance to temperature changes and corrosion resistance is a technical problem that we need to solve.

Contents of the invention

The purpose of the present invention is to solve many defects of the housing materials of household appliances in the prior art. After a large number of tests and explorations, the existing housing raw material composition and preparation method are changed to provide a housing material for household appliances. It has good mechanical properties, high temperature resistance and good heat dissipation performance, is not easy to deform, has uniform texture, and has a simple preparation process and is easy to process.

In order to achieve the above object, the technical solution of the present invention is achieved in the following manner:

A composite material used for housings of household appliances, which is prepared from the following raw materials in parts by weight:

Lithium-based bentonite 1-2 parts, antimony trioxide 1-2 parts, borax 1-2 parts, talcum powder 2-3 parts, white carbon black 3-4 parts, silicon carbide 5-7 parts, polybenzimidazole 6 parts -7 parts, ethylene octene copolymer (POE) 7-8 parts, polycarbonate 8-9 parts, polyethylene terephthalate 10-12 parts, styrene-butadiene rubber 10-12 parts, polyvinyl alcohol 12-15 parts, 15-20 parts of low-density polyethylene, 50-60 parts of polyphenylene ether resin;

The preparation technology of above-mentioned composite material comprises the following steps:

Step 1) taking each raw material by weight for subsequent use;

Step 2) first grinding lithium-based bentonite, borax, talcum powder, white carbon black and silicon carbide into 100-200 mesh powder respectively, and then mixing uniformly to obtain a modifier;

Step 3) polybenzimidazole, ethylene octene copolymer (POE), polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, polyvinyl alcohol, low-density polyethylene and polyphenylene ether resin, Add it to the injection screw of the injection molding machine, heat and melt it, and it will be the base material;

Step 4) adding the modifier and antimony trioxide obtained in step 2) to the base material in the injection molding screw in step 3), and stirring evenly to obtain a mixed material;

Step 5) Inject the mixed material of step 4) into the mold with a temperature of 70-100°C through the screw extrusion of the injection molding machine, the injection pressure of the mixed material is 50-60Mpa, and then keep the pressure at 50-60Mpa for 30-35min, and then naturally After cooling, the mold is opened and the parts are taken.

The beneficial effects obtained by the present invention mainly include: the housing material of household electrical appliances prepared by the present invention has better mechanical properties, high temperature resistance and better heat dissipation performance; Deformation, uniform texture, and simple preparation process, easy processing; the invention adds a variety of modifier raw materials to the composite material, and the raw material compatibility is reasonable, which greatly improves the heat dissipation performance, deformation resistance and mechanical performance.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the application, the following will describe the present invention more clearly and completely in conjunction with the specific embodiments of the application. Obviously, the described embodiments are only part of the implementation of the application. example, not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

A composite material used for housings of household appliances, which is prepared from the following raw materials in parts by weight:

1 part of lithium-based bentonite, 1 part of antimony trioxide, 1 part of borax, 2 parts of talcum powder, 3 parts of white carbon black, 5 parts of silicon carbide, 6 parts of polybenzimidazole, 7 parts of ethylene octene copolymer (POE) , 8 parts of polycarbonate, 10 parts of polyethylene terephthalate, 10 parts of styrene-butadiene rubber, 12 parts of polyvinyl alcohol, 15 parts of low-density polyethylene, 50 parts of polyphenylene ether resin;

The preparation technology of above-mentioned composite material comprises the following steps:

Step 1) taking each raw material by weight for subsequent use;

Step 2) First, lithium-based bentonite, borax, talcum powder, white carbon black and silicon carbide are respectively ground into 100-mesh powder, and then mixed uniformly to obtain a modifier;

Step 3) polybenzimidazole, ethylene octene copolymer (POE), polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, polyvinyl alcohol, low-density polyethylene and polyphenylene ether resin, Add it to the injection screw of the injection molding machine, heat and melt it, and it will be the base material;

Step 4) adding the modifier and antimony trioxide obtained in step 2) to the base material in the injection molding screw in step 3), and stirring evenly to obtain a mixed material;

Step 5) Through the screw extrusion of the injection molding machine, inject the mixed material in step 4) into the mold with a temperature of 70°C, the injection pressure of the mixed material is 50Mpa, and then keep the pressure at 50Mpa for 30min, then cool naturally, and the mold is opened and the parts are ready have to.

Example 2

A composite material used for housings of household appliances, which is prepared from the following raw materials in parts by weight:

2 parts of lithium-based bentonite, 2 parts of antimony trioxide, 2 parts of borax, 3 parts of talcum powder, 4 parts of white carbon black, 7 parts of silicon carbide, 7 parts of polybenzimidazole, 8 parts of ethylene octene copolymer (POE) , 9 parts of polycarbonate, 12 parts of polyethylene terephthalate, 12 parts of styrene-butadiene rubber, 15 parts of polyvinyl alcohol, 20 parts of low-density polyethylene, 60 parts of polyphenylene ether resin;

The preparation technology of above-mentioned composite material comprises the following steps:

Step 1) taking each raw material by weight for subsequent use;

Step 2) First, lithium-based bentonite, borax, talcum powder, white carbon black and silicon carbide are respectively ground into 200-mesh powder, and then mixed uniformly to obtain a modifier;

Step 3) polybenzimidazole, ethylene octene copolymer (POE), polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, polyvinyl alcohol, low-density polyethylene and polyphenylene ether resin, Add it to the injection screw of the injection molding machine, heat and melt it, and it will be the base material;

Step 4) adding the modifier and antimony trioxide obtained in step 2) to the base material in the injection molding screw in step 3), and stirring evenly to obtain a mixed material;

Step 5) Inject the mixed material in step 4) into the mold with a temperature of 100°C through the screw extrusion of the injection molding machine. The injection pressure of the mixed material is 60Mpa, and then keep the pressure at 60Mpa for 35min, then cool naturally, and the mold is opened and the parts are ready have to.

Example 3

The performance test of the household appliance casing composite material prepared in Example 1 and Example 2 of the present invention, the specific test results and reference standards are shown in Table 1:

Table 1

Conclusion: The household appliance housing composite material prepared by the invention has good mechanical properties and thermal conductivity, good fire resistance and insulation performance, is not easily deformed at high temperature, has a long service life, and has high safety performance.

Above, the present invention has been exemplarily described in conjunction with specific embodiments. Obviously, the realization of the present invention is not limited by the above-mentioned manner, as long as various improvements of the method concept and technical solutions of the present invention are adopted, or the present invention is converted without improvement. The ideas and technical solutions of the invention are directly applied to other occasions, all within the protection scope of the present invention.

Claims (3)

1. A composite material for a household appliance housing, characterized in that, the composite material is prepared from the following raw materials: Lithium-based bentonite, antimony trioxide, borax, talc, silica, silicon carbide, polybenzimidazole, ethylene octene copolymer, polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, Polyvinyl alcohol, low density polyethylene and polyphenylene ether resins. 2. The composite material according to claim 1, characterized in that, the composite material is prepared from the following raw materials in parts by weight: Lithium-based bentonite 1-2 parts, antimony trioxide 1-2 parts, borax 1-2 parts, talcum powder 2-3 parts, white carbon black 3-4 parts, silicon carbide 5-7 parts, polybenzimidazole 6 parts -7 parts, ethylene octene copolymer 7-8 parts, polycarbonate 8-9 parts, polyethylene terephthalate 10-12 parts, styrene-butadiene rubber 10-12 parts, polyvinyl alcohol 12-15 parts 15-20 parts of low-density polyethylene, 50-60 parts of polyphenylene ether resin. 3. composite material according to claim 2, is characterized in that, the preparation technology of described composite material comprises the steps: Step 1) taking each raw material by weight for subsequent use; Step 2) first grinding lithium-based bentonite, borax, talcum powder, white carbon black and silicon carbide into 100-200 mesh powder respectively, and then mixing uniformly to obtain a modifier; Step 3) Add polybenzimidazole, ethylene octene copolymer, polycarbonate, polyethylene terephthalate, styrene-butadiene rubber, polyvinyl alcohol, low-density polyethylene and polyphenylene ether resin to the injection molding machine In the injection molding screw, heat and melt, which is the base material; Step 4) adding the modifier and antimony trioxide obtained in step 2) to the base material in the injection molding screw in step 3), and stirring evenly to obtain a mixed material; Step 5) Inject the mixed material of step 4) into the mold with a temperature of 70-100°C through the screw extrusion of the injection molding machine, the injection pressure of the mixed material is 50-60Mpa, and then keep the pressure at 50-60Mpa for 30-35min, and then naturally After cooling, the mold is opened and the parts are taken.