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Polyformaldehyde composition and preparation method thereof

A polyoxymethylene composition and a technology for uniform mixing, applied in the field of polyoxymethylene composition and its preparation, can solve the problem that the tensile strength, flexural strength, flexural modulus, heat resistance and other properties are greatly reduced, and the polarity of the POM molecular chain is weak. , limiting the application of POM in the market, etc., to achieve the effect of simple preparation process, stable size and good impact resistance

Inactive Publication Date: 2008-03-19
SHENZHEN KEJU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polarity of the POM molecular chain is weak, there are no side groups, and it is poorly compatible with most polymers, and there are few polymers that can toughen POM.
Most of the existing POM toughening is to blend thermoplastic polyurethane elastomer (TPU) with POM to form hydrogen bonds. The two have certain compatibility, so TPU can be used as a toughening agent for POM, although its toughening The effect is obvious, but other properties such as tensile strength, flexural strength, flexural modulus, heat resistance and other properties are greatly reduced, which greatly limits the market application of POM materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix the weight ratio of POM 23%, ABS 74%, compatibilizer 2.2%, lubricant 0.4%, 168 0.2%, 1076 0.2% in the mixer; put the mixed raw materials into the twin-screw extruder The feeding hopper is melted and extruded, granulated, fully plasticized, melted, compounded, then extruded, drawn, cooled, pelletized, dried and packaged; the processing technology is as follows: Twin-screw extruder zone 160- 170℃, zone 2 160-180℃, zone 3 160-180℃, zone 4 170-190℃, zone 5 170-190℃, zone 6 160-180℃, zone 7 160-170℃, zone 8 160-170℃ ℃; the screw speed is controlled at 200-500 rpm; the residence time is 2-6 minutes.

Embodiment 2

[0035] Mix the weight ratio of POM 35%, ABS 60%, compatibilizer 4.2%, lubricant 0.4%, 168 0.2%, 1076 0.2% in the mixer; put the mixed raw materials into the twin-screw extruder The feeding hopper is melted and extruded, granulated, fully plasticized, melted, compounded, then extruded, drawn, cooled, pelletized, dried and packaged; the processing technology is as follows: Twin-screw extruder zone 160- 170℃, zone 2 160-180℃, zone 3 160-180℃, zone 4 170-190℃, zone 5 170-190℃, zone 6 160-180℃, zone 7 160-170℃, zone 8 160-170℃ ℃; the screw speed is controlled at 200-500 rpm; the residence time is 2-6 minutes.

Embodiment 3

[0037] Mix the weight ratio of POM 60%, ABS 35%, compatibilizer 4.2%, lubricant 0.6%, 168 0.2%, 1076 0.2% in the mixer; put the mixed raw materials into the twin-screw extruder The feeding hopper is melted and extruded, granulated, fully plasticized, melted, compounded, then extruded, drawn, cooled, pelletized, dried and packaged; the processing technology is as follows: Twin-screw extruder zone 160- 170℃, zone 2 160-180℃, zone 3 160-180℃, zone 4 170-190℃, zone 5 170-190℃, zone 6 160-180℃, zone 7 160-170℃, zone 8 160-170℃ ℃; the screw speed is controlled at 200-500 rpm; the residence time is 2-6 minutes.

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Abstract

The invention discloses a polyoxymethylene composition and a method for preparing the same, wherein the composition includes 20-95 percent of POM, 4-80 percent of ABS, 0.1-20 percent of compatibilizer, 0.1-1.0 percent of lubricant, and 0.1-1.2 percent of antioxidant in weight proportion ( percent). Compared with conventional TPU toughening POM system, when the POM / ABS system of the invention achieves the same impact property, the mechanical comprehensive property of the invention is obviously better than the conventional TPU toughening POM system, and the heat resistance is greatly improved. The alloy material has simple preparation technology, and has advantages of dimensional stability, good appearance, high flowability, drug resistance and easy processing forming, which can be widely used to manufacture automobile, electronic and electric components. The invention improves the POM impact toughness and greatly enriches the use of polyoxymethylene in automobile, electronic and electric components through blending with the ABS material.

Description

[technical field] [0001] The invention relates to the technical field of polymer materials, in particular to a polyoxymethylene composition and a preparation method thereof. [Background technique] [0002] Polyoxymethylene (POM) molecular chains are alternately arranged by C-0 and twisted into a helical shape. The regular molecular chain conformation makes polyoxymethylene easy to crystallize, and it is easy to form large spherulites during melt processing. The high crystallinity of POM (about 60% to 80%) endows it with high hardness and rigidity. POM has the characteristics of wear resistance, good self-lubrication, and excellent fatigue resistance. Its mechanical properties are close to metal materials, and it is one of the five major engineering plastics. . POM raw materials come from a wide range of sources, and can be processed by injection molding, blow molding, extrusion molding and rotary casting. It is widely used in machinery, automobiles, electronic appliances, ...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08K5/524C08L55/02C08L83/04C08K5/10
Inventor 徐东贺永李茂林
Owner SHENZHEN KEJU NEW MATERIAL
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