Hot-water resistance polyformaldehyde composition and preparation method thereof

A polyoxymethylene composition and a technology for heat-resistant water, applied in the material field, can solve the problems of affecting the formaldehyde absorption efficiency, decreasing the elongation at break, poor dispersibility, etc., so as to reduce the possibility of internal peeling, promote dispersion and performance stable effect

Active Publication Date: 2014-12-17
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The use of stearic acid amide lubricants can easily lead to precipitation;
[0008] 2. It is common to use thermosetting melamine-formaldehyde condensate as formaldehyde absorbent. Due to the high viscosity, the dispersion in POM is not good, which affects the formaldehyde absorption efficiency;
[0009] 4. It is common to use high-melting point formaldehyde absorbents such as melamine and nylon, which may easily cause a decrease in elongation at break;
[0011] 6. There is no comparison of comprehensive mechanical properties (tensile, bending, impact, hardness) and color properties (color difference, yellowness index) of the modified system after hot water aging test for a certain period of time and performance indicators before aging

Method used

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  • Hot-water resistance polyformaldehyde composition and preparation method thereof
  • Hot-water resistance polyformaldehyde composition and preparation method thereof
  • Hot-water resistance polyformaldehyde composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh the following materials by weight percentage:

[0043] 100 parts of polyoxymethylene, 0.1 parts of white oil, 0.2 parts of calcium stearate, antioxidant 245: 0.4 parts, antioxidant 168: 0.4 parts, thermoplastic melamine formaldehyde condensate 0.5 parts, formic acid absorbent long-chain carboxylate calcium salt CAV102: 0.4 parts, nucleating agent long-chain calcium sulfonate HK245: 0.3 parts.

[0044] Dry polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into a high-speed mixer and mix them, use a vented co-rotating twin-screw extruder to melt and blend, extrude and granulate, and the screw speed is 280 rpm , the barrel temperature (temperature) is:

[0045] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0046] Room temperature 165 170 175 180 185 185 190 190 190 185

Embodiment 2

[0048] Weigh the following materials by weight percentage:

[0049] 100 parts of polyoxymethylene, 0.2 parts of white oil, 0.4 parts of calcium stearate, the main antioxidant is antioxidant 1010: 0.3 parts, the auxiliary antioxidant is antioxidant 168: 0.6 parts, 1 part of thermoplastic melamine formaldehyde condensate , formic acid absorbent long-chain carboxylic acid calcium salt CAV102: 0.2 parts, nucleating agent long-chain calcium sulfonate HK245: 0.2 parts.

[0050] Dry polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into a high-speed mixer and mix them, use a vented co-rotating twin-screw extruder to melt and blend, extrude and granulate, and the screw speed is 210 rpm , the barrel temperature (°C) is:

[0051] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0052] Room temperature 160 165 170 170 175 175 180 180 180 175

Embodiment 3

[0054] Weigh the following materials by weight percentage:

[0055] 100 parts of polyoxymethylene, 0.1 parts of white oil, 0.3 parts of calcium stearate, the main antioxidant is antioxidant 246: 0.6 parts, the auxiliary antioxidant is antioxidant 168: 0.3 parts, thermoplastic melamine formaldehyde condensate 0.8 parts , Formic acid absorbent long-chain carboxylic acid calcium salt (CAV102): 0.3 parts, nucleating agent diatomaceous earth (MN-4): 0.1 parts.

[0056] Dry polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into a high-speed mixer for mixing, use a vented co-rotating twin-screw extruder to melt and blend, extrude and granulate, and the screw speed is 250 rpm , the barrel temperature (°C) is:

[0057] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0058] Room temperature 160 170 170 175 180 180 185 185 185 180

[0059] Table 1 embodiment and the performance contrast of unmodified polyoxymethylene

...

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Abstract

The invention belongs to the technical field of material, and relates to a hot-water resistance polyformaldehyde composition and a preparation method thereof. The hot-water resistance polyformaldehyde composition comprises the following ingredients by weight part: 100 parts of polyformaldehyde, 0.1-0.2 parts of white oil, 0.2-0.4 parts of calcium stearate, 0.3-0.6 parts of main anti-oxidant, 0.3-0.6 parts of auxiliary anti-oxidant, 0.5-1 part of formaldehyde absorbent, 0.2-0.4 parts of formic acid absorbent and 0.1-0.3 parts of nucleating agent. Compared with the prior art, through the boiling by water and aging experiment of the prepared composition, the mechanical property conservation rate is high, aberration and yellowing index change are little, and the hot-water resistance is obviously increased.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a polyoxymethylene resin composition and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) is an engineering plastic with excellent comprehensive properties. It has good solvent resistance and chemical resistance. It can be used for a long time at a temperature of about 100 ° C. It is often used to replace metal materials and is used as a hot water environment. Raw materials for the preparation of valves, pipes and pump body components. However, when polyoxymethylene is used in hot water, problems such as discoloration, additive precipitation, and sudden fracture often occur, which limit its application. This has also become a research hotspot of incoming polyoxymethylene materials. [0003] Yu Jian ("Engineering Plastics Application", 2001, 29(6): 32-34, Research on the Boiling Water Stabilization of Polyoxymethylene) found that POM containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L61/28C08K13/02C08K5/01C08K5/098C08K5/42C08K3/34B29C47/92B29C48/92
Inventor 杨桂生王贻孙
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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