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Polyformaldehyde composition with light stability

A polyoxymethylene composition and light-stabilizing technology, which is applied in the field of light-stabilized polyoxymethylene compositions, can solve the problems of easily forming cracks and pulverization on the surface, so as to improve the degree of photoaging, delay the yellowness index, and reduce the aging speed Effect

Inactive Publication Date: 2012-06-27
TANGSHAN ZHONGHAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, polyoxymethylene is easy to decompose under the condition of light, without special light-stabilized polyoxymethylene resin, after a relatively short aging time, the surface is easy to form cracks and pulverization

Method used

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  • Polyformaldehyde composition with light stability
  • Polyformaldehyde composition with light stability
  • Polyformaldehyde composition with light stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The light-stable polyoxymethylene composition is prepared by the following ratio and method.

[0014] Raw material ratio: polyoxymethylene 100kg, calcium stearate 0.1kg, melamine 0.2kg, UVA-11 0.3kg; HALS-2 0.3kg.

[0015] Preparation method: add the above raw materials into a high-speed mixer and mix them, use an injection molding machine to make a 2mm thick POM injection molded plate, and then test its photoaging according to SAE J2412 "Accelerated exposure of automotive interior parts with a xenon lamp device with controllable irradiance" Performance, test results and performance comparison of polyoxymethylene raw materials are shown in Table 1.

[0016]

Embodiment 2

[0017] Embodiment 2: The light-stable polyoxymethylene composition is prepared by the following ratio and method.

[0018] Raw material ratio: polyoxymethylene 100kg, calcium stearate 0.1kg, melamine 0.2kg, UVA-11 0.5kg, HALS-2 0.5kg.

[0019] Adopt the method identical with embodiment 1 to make 2mm thick POM injection-molded plate, then according to SAE J2412 " use the xenon lamp device of controllable irradiance to carry out accelerated exposure to automotive interior parts " test its photoaging performance, its result and polyoxymethylene The performance comparison of raw materials is shown in Table 2.

[0020]

Embodiment 3

[0021] Embodiment 3: The light-stable polyoxymethylene composition is prepared by the following ratio and method.

[0022] Raw material ratio: polyoxymethylene 100kg, calcium stearate 0.2kg, polyamide 0.3kg, UVA-7 0.8kg, HALS-2 0.1kg.

[0023] Adopt the method identical with embodiment 1 to make 2mm thick POM injection-molded plate, then according to SAE J2412 " use the xenon lamp device of controllable irradiance to carry out accelerated exposure to automotive interior parts " test its photoaging performance, its result and polyoxymethylene The performance comparison of raw materials is shown in Table 3.

[0024]

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PUM

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Abstract

The invention discloses a polyformaldehyde composition with light stability. The composition is prepared from the following raw materials in part by weight: 100 parts of polyformaldehyde, 0.3 to 0.5 part of heat stabilizer, 0.1 to 0.8 part of ultraviolet absorbent and 0.1 to 0.8 part of hindered amine light stabilizer. According to the composition, by improving the light aging formula of the polyformaldehyde, the light aging degree of a polyformaldehyde product is improved, and the service life of the polyformaldehyde product is prolonged. The composition has abrasion resistance, self-lubricating property, oil resistance and peroxide resistance; and the aging speed of the composition is obviously reduced, the yellowness index is delayed, the luster loss rate is reduced, and surface cracking and pulverization are delayed.

Description

technical field [0001] The invention relates to a polyoxymethylene composition, especially a light-stable polyoxymethylene composition. Background technique [0002] Polyoxymethylene is a thermoplastic crystalline polymer known as "Super Steel" or "Sai Steel", also known as polyoxymethylene. Usually, the polymer obtained by formaldehyde polymerization has a low degree of polymerization and is easily depolymerized by heat. Polyoxymethylene is a hard and dense material with a smooth surface and luster, light yellow or white, and can be used for a long time in the temperature range of -40 to 100 °C. Its wear resistance and self-lubrication are also superior to most engineering plastics, and it has good oil resistance and peroxide resistance. [0003] However, polyoxymethylene is easy to decompose under the condition of light, without special light-stabilized polyoxymethylene resin, after a relatively short aging time, the surface is easy to form cracks and pulverization. Co...

Claims

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Application Information

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IPC IPC(8): C08L59/00C08L77/00C08K5/098C08K5/3492
Inventor 王军贾宗海薛军亮赵艳红金旺李莹琦蒋会杰张玉婕
Owner TANGSHAN ZHONGHAO CHEM
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