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A kind of polyoxymethylene film and preparation method thereof

A technology of polyoxymethylene and polyoxymethylene resin, applied to flat products, other household appliances, applications, etc., to achieve the effect of smooth surface, high strength, and fast crystallization rate

Active Publication Date: 2019-07-16
TANGSHAN KAILUAN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technology of preparing polyoxymethylene film with high mechanical strength in both horizontal and vertical directions by bidirectional synchronous film drawing method has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mass ratio of raw materials of the polyoxymethylene film of the present invention is: 94 parts of polyoxymethylene resin, 5 parts of novolak resin, and 1 part of antioxidant.

[0015] Preparation process: weigh polyoxymethylene resin, novolac resin and antioxidant with a melt index of 3 g / 10min according to the mass ratio, mix them evenly in a high-speed mixer, and then put them into a screw extruder for melt blending Finally, it is extruded through a mold, and the extruded melt is shaped by a cooling roller to make a polyoxymethylene film; then the polyoxymethylene film is placed on the stretching mold frame and fixed, and the hot air is blown to the film for preheating. Longitudinal and transverse two-way synchronous stretching, heat setting after stretching to the set draft ratio, and finally edge trimming, thickness measurement, and winding.

[0016] Process parameters: The temperature of the feeding section of the main extruder is 170~175°C, the temperature of ...

Embodiment 2

[0019] The mass ratio of raw materials of the polyoxymethylene film of the present invention is: 96 parts of polyoxymethylene resin, 3 parts of novolak resin, and 1 part of antioxidant.

[0020] Preparation process: Weigh polyoxymethylene resin, novolac resin and antioxidant with a melt index of 9 g / 10min according to the mass ratio, mix them evenly in a high-speed mixer, and then put them into a screw extruder for melt blending Finally, it is extruded through a mold, and the extruded melt is shaped by a cooling roller to make a polyoxymethylene film; then the polyoxymethylene film is placed on the stretching mold frame and fixed, and the hot air is blown to the film for preheating. Longitudinal and transverse two-way synchronous stretching, heat setting after stretching to the set draft ratio, and finally edge trimming, thickness measurement, and winding.

[0021] Process parameters: The temperature of the feeding section of the main extruder is 170~175°C, the temperature of ...

Embodiment 3

[0024] The mass ratio of the raw materials of the polyoxymethylene film of the present invention is: 97 parts of polyoxymethylene resin, 2.5 parts of novolak resin, and 0.5 parts of antioxidant.

[0025] Preparation process: weigh polyoxymethylene resin, novolac resin and antioxidant with a melt index of 3 g / 10min according to the mass ratio, mix them evenly in a high-speed mixer, and then put them into a screw extruder for melt blending Finally, it is extruded through a mold, and the extruded melt is shaped by a cooling roller to make a polyoxymethylene film; then the polyoxymethylene film is placed on the stretching mold frame and fixed, and the hot air is blown to the film for preheating. Longitudinal and transverse two-way synchronous stretching, heat setting after stretching to the set draft ratio, and finally edge trimming, thickness measurement, and winding.

[0026] Process parameters: The temperature of the feeding section of the main extruder is 170~175°C, the temper...

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Abstract

The invention discloses a polyformaldehyde thin film and a preparation method thereof. The polyformaldehyde thin film comprises the following components by weight: 94-98 parts of a polyformaldehyde resin, 1-5 parts of a linear phenolic resin, and 0.5-1 part of an anti-oxidant. In allusion to the problem that the film formation is difficult because the crystallization speed of the polyformaldehydeis rapid and the crystallinity degree is high, the linear phenolic resin is introduced as a crystallization interference agent, the crystallization speed is reduced, and the crystallization time is prolonged, so the film-forming property of the polyformaldehyde is improved. In addition, a synchronous two-way stretching method is used, so the problem that the crosswise stretching film-formation isdifficult because of the rapid crystallization after the longitudinal stretching is prevented. In the raw material and technology aspect, the problem that the uniformity is bad because fracture and afine neck are easily generated in the stretching process of the polyformaldehyde thin film is overcome, and the high-strength polyformaldehyde thin film is prepared.

Description

technical field [0001] The invention belongs to the field of film preparation, in particular to a polyoxymethylene film and a preparation method thereof. Background technique [0002] As a highly crystalline polymer, polyoxymethylene has excellent mechanical properties, wear resistance, dimensional stability, chemical corrosion resistance and self-lubricating properties. Its raw materials and modified materials are widely used in automobiles, mechanical parts, electronic appliances, etc. There are applications in all fields. For example, if polyoxymethylene is used as raw material to stretch longitudinally and horizontally in a certain temperature range, the molecules can be rearranged, the degree of orientation can be improved, and the performance of the polyoxymethylene material can be further improved, so that the polyoxymethylene film has the characteristics of high strength and smooth surface. , can be widely used in packaging, construction, interior decoration, medici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/02C08L61/06C08J5/18B29C55/16B29L7/00
CPCB29C55/16B29L2007/00C08J5/18C08J2359/02C08J2461/06
Inventor 王亚涛李建华马小丰刘莉莉郭学华
Owner TANGSHAN KAILUAN CHEM TECH CO LTD