Polyformaldehyde product and preparation method thereof

A technology of polyoxymethylene and products, applied in the coating and other directions, can solve the problems of poor adhesion on the surface of polyoxymethylene, and achieve the effects of improving the characteristics that are not easy to spray, improving adhesion and easy spraying

Active Publication Date: 2013-12-11
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent increases the bonding strength of the polyoxymethylene surface by using a binder, it does not fundamentally solve the problem of poor adhesion of the polyoxymethylene surface

Method used

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  • Polyformaldehyde product and preparation method thereof

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[0025] The embodiment of the present invention discloses a preparation method of a polyoxymethylene product, comprising the following steps:

[0026] (A) Mix 60-88wt% polyoxymethylene powder, 10-38wt% soluble material, 1-5wt% compatibilizer, 0.1-0.8wt% lubricant and 0.1-0.8wt% antioxidant, melt mix Refined, then extruded and granulated to obtain pellets;

[0027] (B) Injection molding the pellets to obtain a molded product;

[0028] (C) soaking the molded product in a solvent to obtain a polyoxymethylene product;

[0029] The soluble material is nanoscale ABS resin or nanoscale polyurethane, and the solvent is one or more of cyclohexane, benzene, acetone, butanone, toluene and tetrahydrofuran; or,

[0030] The soluble material is titanium dioxide, and the solvent is one or more of concentrated sulfuric acid and hydrofluoric acid.

[0031] According to the invention, polyoxymethylene products are prepared from polyoxymethylene, soluble materials, compatibilizers, lubricants ...

Embodiment 1

[0048] Add 76.7% by weight of polyoxymethylene, 20% of nano-level ABS and 2.6% of methyl acrylate-butadiene-styrene copolymer to a high-speed mixer and mix evenly, then add 0.5% of glycerol monostearate and four [ b-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.2% mixed, after mixing evenly, the material was added to the hopper of the vented twin-screw extruder, After melting and kneading, extruding and granulating. The processing technology is as follows: extruder barrel temperature 150°C-200°C, screw speed 100r / min, and drying at 80°C for 3 hours to obtain pellets uniformly dispersed with nano ABS resin. Then the above granules are injection molded, the molding process is barrel 190°C, injection pressure 50MPa, injection time 50s, mold temperature 70°C, to obtain a molded product uniformly dispersed with nano-sized ABS resin. Finally, the above molded product is soaked in a container Put it in a special treatment tank with cyclohexane solvent, ta...

Embodiment 2

[0050] Add 66.8% by weight of polyoxymethylene, 28% of nano-sized ABS and 4.4% of ethylene-vinyl acetate copolymer to a high-speed mixer and mix evenly, then add 0.2% of pentaerythritol tristearate and bis[3-(3- tert-butyl-5-methyl-4-hydroxyphenyl) triethylene glycol propionate 0.6% is mixed, and after being mixed evenly, material is joined in the feed hopper of exhaust type twin-screw extruder, After melting and kneading, extruding and granulating. The processing technology is as follows: extruder barrel temperature 160°C, screw speed 180r / min, and drying at 85°C for 4 hours to obtain pellets uniformly dispersed with nano ABS resin. Then the above granules are injection molded, the molding process is cylinder 200°C, injection pressure 55MPa, injection time 40s, mold temperature 80°C, to obtain molded products uniformly dispersed with nano-sized ABS resin. Finally, soak the above molded product in a special treatment tank equipped with cyclohexane solvent, take it out after 1...

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Abstract

The invention provides a preparation method of a polyformaldehyde product. The preparation method comprises the following steps: mixing 58-88 wt% of polyformaldehyde powder, 10-40 wt% of a soluble material, 1-5 wt% of compatilizer, 0.1-0.8 wt% of lubricant and 0.1-0.8 wt% of antioxygen, fusing and mixing, and then, extruding and granulating to obtain granules; carrying out injection moulding on the granules to obtain a formed product; and immersing the formed product in a solvent to obtain the polyformaldehyde product. The prepared polyformaldehyde product has an uneven concave hole nanostructure; the surface adhesive power of the polyformaldehyde product is greatly increased; the characteristic that the surface of the polyformaldehyde product is difficult to spray is radically improved; furthermore, a sprayed coating is difficult to fall off; in addition, the polyformaldehyde product has good toughness. The experimental results show that the polyformaldehyde product provided by the invention is 47-60% in breaking elongation and 7-18 KJ / m<2> in nick impact intensity and is easy to spray; the paint removing grade is within 3; all properties of the polyformaldehyde product can pass the test.

Description

technical field [0001] The invention relates to the field of thermoplastic engineering plastics, in particular to a polyoxymethylene product and a preparation method thereof. Background technique [0002] POM is a thermoplastic engineering plastic with high melting point, high density and high crystallinity. Compared with other thermoplastics, polyoxymethylene also has higher strength and stiffness, better dimensional stability, creep resistance, fatigue resistance, wear resistance, chemical resistance and better lubricity, etc. It has excellent performance and is the closest to metal among engineering plastics. It has been widely used in aviation, automobile, precision instrument, electronic appliances, machinery and construction industries. [0003] As a smooth, glossy, hard and dense material, polyoxymethylene has low surface energy and is not easy to adhere to paint, which makes it difficult to paint the surface of polyoxymethylene products. Even if it can be painted, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L59/00C08J9/36C08J7/04
Inventor 刘佩珍刘海春张红伟樊钹李欣
Owner YUNNAN YUNTIANHUA
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