Polyformaldehyde composite with surface capable of being finished and preparation method thereof

A composite material and polyoxymethylene technology, which is applied in the field of polyoxymethylene, can solve the problems of increasing the cost of producing products, changing the performance of the POM matrix, and increasing the production process of the products, so as to improve the mechanical properties, improve the paintability, and be easy to industrialized production. Effect

Active Publication Date: 2015-12-09
重庆云天化天聚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japan has adopted the method of pre-coating paint, pre-coating a layer of 10-15 μm film on the surface of POM with a special pre-coating paint, and treating it at a temperature of 135°C for 30 minutes, but this excessive heat treatment temperature will cause Deformation of POM products
In summary, it can be seen that although the above-mentioned polymer surface treatment methods can improve the paintability of the polymer surface, these methods will change the performance of the POM matrix, cause changes in the size of the product, and increase the production process of the product and improve the quality of the product. It reduces the cost of the enterprise's production of products, and has certain shortcomings

Method used

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  • Polyformaldehyde composite with surface capable of being finished and preparation method thereof
  • Polyformaldehyde composite with surface capable of being finished and preparation method thereof
  • Polyformaldehyde composite with surface capable of being finished and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] One, a polyoxymethylene composite material that can be painted on the surface, comprising the following components by weight: 82 parts of polyoxymethylene POM, 12 parts of thermoplastic phenolic resin, 1 part of polyurethane thermoplastic elastomer TPU, 5 parts of silicon dioxide and 0.5 part of anti- Oxidizing agent 1010. The melt index of the polyoxymethylene POM is 9g / 10min, and the tensile strength is 58Mpa.

[0023] Two, the preparation method of the polyoxymethylene composite material that can be painted on the above-mentioned surface, comprises the steps:

[0024] 1) Weigh the ingredients of the above-mentioned parts by weight and knead them in a high mixer for 7 minutes, then send the uniformly mixed materials into a twin-screw extruder for extrusion and granulation; wherein, the twin-screw extruder starts from the feed The temperature of each section between the mouth and the extrusion mouth is: the first zone 110°C, the second zone 170°C, the third zone 200°C...

Embodiment 2

[0028] 1. A polyoxymethylene composite material that can be painted on the surface, comprising the following components by weight: 75 parts of polyoxymethylene POM, 15 parts of thermoplastic phenolic resin, 10 parts of polyvinyl alcohol PVA, 10 parts of calcium carbonate and 0.5 part of antioxidant 1010. The melt index of the polyoxymethylene POM is 8g / 10min, and the tensile strength is 60Mpa.

[0029] Two, the preparation method of the polyoxymethylene composite material that can be painted on the above-mentioned surface, comprises the steps:

[0030] 1) Weigh the ingredients of the above-mentioned parts by weight and knead them in a high mixer for 7 minutes, then send the uniformly mixed materials into a twin-screw extruder for extrusion and granulation; wherein, the twin-screw extruder starts from the feed The temperature of each section between the mouth and the extrusion mouth is: 115°C in the first zone, 160°C in the second zone, 190°C in the third zone, 210°C in the fou...

Embodiment 3

[0034] One, a polyoxymethylene composite material that can be painted on the surface, comprising the composition of following parts by weight: 75 parts of polyoxymethylene POM, 15 parts of thermoplastic phenolic resin, 8 parts of polyvinyl alcohol PVA, 4 parts of polyolefin type thermoplastic elastomer TPE, 4 parts 1 part silicone rubber, 4 parts quartz sand and 0.5 part antioxidant 1010. The melt index of the polyoxymethylene POM is 10g / 10min, and the tensile strength is 62Mpa.

[0035] Two, the preparation method of the polyoxymethylene composite material that can be painted on the above-mentioned surface, comprises the steps:

[0036] 1) Weigh the ingredients of the above-mentioned parts by weight and knead them in a high mixer for 7 minutes, then send the uniformly mixed materials into a twin-screw extruder for extrusion and granulation; wherein, the twin-screw extruder starts from the feed The temperature of each section between the mouth and the extrusion mouth is: 120°...

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Abstract

The invention discloses a polyformaldehyde composite with the surface capable of being finished and a preparation method thereof. The polyformaldehyde composite is prepared from polyformaldehyde (POM), macromolecular surface modifiers, filler and antioxidants. The preparation method comprises the steps that all the components are weighed and put in a high mixing machine, and mixing is performed for 5-10 min; the evenly mixed materials are fed into a double-screw extruder for extrusion granulating, and then the extruded and granulated materials are dried at 50-120 DEG C for 3-4 h; injection forming is performed on the dried materials, and the polyformaldehyde composite with the surface capable of being finished is obtained. According to the prepared polyformaldehyde composite, the adhesive force between the polyformaldehyde and acrylic acid paint reaches 0 level while the excellent mechanical property of polyformaldehyde base materials is retained, and therefore the finishing property of the polyformaldehyde composite is significantly improved; compared with the other methods, the preparation method cannot cause the size changes of products and has the advantages of being easy to operate, low in cost and capable of easily achieving industrialized production.

Description

technical field [0001] The invention belongs to the technical field of polyoxymethylene, and in particular relates to a polyoxymethylene composite material whose surface can be painted and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) is one of the five major engineering plastics, with (—CH2O—) as the main chain, high crystallinity, good fatigue resistance, low friction coefficient, resistance to organic solvents, and simple molding and processing. At the same time, Polyoxymethylene also has the characteristics of low water absorption, stable size, luster, heat resistance, bending strength, high fatigue resistance, etc. It has good creep resistance, geometric stability and impact resistance, good oil resistance, overheat resistance properties such as oxides. However, due to the high crystallinity of polyoxymethylene and the fact that the molecular chain does not contain hydrophilic groups and lipophilic substrates, the paintability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L61/06C08L29/04C08K3/36C08K3/26B29B9/06B29C47/92B29C45/78B29C48/92
Inventor 李又兵杨朝龙陈文张攀周桦林
Owner 重庆云天化天聚新材料有限公司
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