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Crystallization regulation system and application of crystallization regulation system in rapid molding of polyformaldehyde panel/bar

A system and crystallization technology, applied in the field of polymer material modification, to achieve the effect of refining grains, accelerating crystallization rate, and inhibiting crystallization rate

Inactive Publication Date: 2015-11-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the simultaneous use of crystallization inhibitors and nucleating agents in the existing literature

Method used

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  • Crystallization regulation system and application of crystallization regulation system in rapid molding of polyformaldehyde panel/bar
  • Crystallization regulation system and application of crystallization regulation system in rapid molding of polyformaldehyde panel/bar

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Embodiment Construction

[0037] In the research process of the present invention, repeated tests have been done on the selection and proportioning of materials, and several preferred embodiments are selected below to further describe the present invention in detail, wherein the raw materials used can be obtained through commercial channels.

[0038] Embodiment 1-10 and comparative example 1-4 carry out batching according to Table 1 and Table 2, then prepare according to the following steps: (1) POM resin, crystallization control system, flame retardant and auxiliary agent are put into mixer, adjust The speed of the mixer is 500-1500rpm, the mixing time is 1-2min, all materials are mixed evenly, and the materials are discharged; (2) the raw materials mixed in step (1) are added to the twin-screw extruder, extruded and granulated; the twin-screw The temperature of each section of the extruder: 50-100°C, 185-195°C, 200-210°C, 205-210°C, die: 200-205°C, screw speed: 120-240rpm.

[0039] Table 1 Embodiment...

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Abstract

The invention relates to a crystallization regulation system and application of the crystallization regulation system in rapid molding of a polyformaldehyde panel / bar. The crystallization regulation system is a blending system of a crystallization inhibitor and a nucleating agent, wherein the mass ratio of the crystallization inhibitor to the nucleating agent is (3-30): (0.1-1). During application, POM (polyformaldehyde) resin to the crystallization regulation system are mixed according to a mass ratio of 100 to (3-25). In addition, the invention further relates to a special material for rapid and continuous molding of the polyformaldehyde panel / bar using the crystallization regulation system. The special material is prepared from the following components in parts by weight: 100 parts of the POM resin, 3-25 parts of the crystallization regulation system, 1-10 parts of auxiliaries and 5-20 parts of a flame retardant. According to the invention, the problem that in POM processing, mild crystallization rate and high crystallinity are hard to gain is overcome by applying and balancing a contradiction that the inhibitor inhibits the crystallization rate and reduces the crystallinity while the nucleating agent improves both the crystallinity and the crystallization rate, so that rapid and continuous molding of large products such bars, panels and the like is realized.

Description

technical field [0001] The invention belongs to the field of modification of polymer materials, and in particular relates to a crystallization control system and its application in rapid and continuous molding of large parts such as polyoxymethylene plates / rods. Background technique [0002] Polyoxymethylene (POM) has excellent mechanical properties, outstanding dynamic fatigue resistance, friction / abrasion resistance, self-lubrication and excellent electrical properties. It is widely used in the fields of automobiles, electronic appliances and machinery, and is known as "plastic metal". . However, due to the rapid crystallization characteristics and high molding shrinkage rate (3-3.5%), POM can only be used as small parts such as gears, bearings, blades, zippers, etc., and the product surface is prone to depression, warping, and even when forming large parts. Defects such as internal voids restrict product size and application. In order to avoid the above defects, current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/02C08L55/02C08L75/04C08L33/04C08K13/02C08K3/34C08K3/38C08K5/098C08K5/521C08K3/22
Inventor 薛美玲沈佳俊于永良
Owner QINGDAO UNIV OF SCI & TECH
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