Composite polyamide material for large-thickness-tolerance precision injection molded part and injection molding method

A composite material and polyamide technology, applied in the coating and other directions, can solve the problems of warpage deformation, shrinkage rate difference, etc., and achieve the effect of reducing the shrinkage of the part, reducing the grain size and excellent performance.

Inactive Publication Date: 2016-07-06
ZHEJIANG SENCHUAN FURNITURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the above-mentioned problems existing in the prior art, and aims to provide a polyamide composite material for precision injection molded parts with large thickness difference and a preparation process for precision injection molded parts with large thickness difference, so as to solve the problems of general polyamide When plastic is used to produce injection molded parts with large thickness difference, it is easy to cause warpage and deformation due to the difference in shrinkage rate between different wall thickness parts

Method used

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  • Composite polyamide material for large-thickness-tolerance precision injection molded part and injection molding method
  • Composite polyamide material for large-thickness-tolerance precision injection molded part and injection molding method
  • Composite polyamide material for large-thickness-tolerance precision injection molded part and injection molding method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A kind of polyamide compound material that is used for precision injection molded parts with large thickness difference of the present invention, it is made up of the raw material of following weight part:

[0030]

[0031] Among them, the stainless steel fiber masterbatch is the stainless steel fiber masterbatch of Beijing Jinfubang Fiber Technology Co., Ltd.; the talc powder has a particle size of 1500 mesh; the dendritic rheology modifier is a polymer of 1-3 generations Amidoamine dendrimers; the anti-shrinkage agent is a commercially available plastic inorganic anti-shrinkage agent of Zhangjiagang Younuo Chemical Co., Ltd.

[0032] The polyamide composite is prepared as follows:

[0033] Step 1, prepare materials according to the ratio of raw materials

[0034] Step 2, put the materials prepared in step 1 into a high-speed mixer, stir evenly at a high speed, and discharge the materials at 45°C for later use.

[0035] Step 3, add the spare material into the twin...

Embodiment 2

[0045] A kind of polyamide compound material that is used for precision injection molded parts with large thickness difference of the present invention, it is made up of the raw material of following weight part:

[0046]

[0047] Among them, the stainless steel fiber masterbatch is the stainless steel fiber masterbatch of Beijing Jinfubang Fiber Technology Co., Ltd.; the talc powder has a particle size of 1500 mesh; the dendritic rheology modifier is a polymer of 1-3 generations Amidoamine dendrimers; the anti-shrinkage agent is a commercially available plastic inorganic anti-shrinkage agent of Zhangjiagang Younuo Chemical Co., Ltd.

[0048] The preparation method of the polyamide composite material is the same as in Example 1, and the same method as in Example 1 is used to make precision injection molded parts with large thickness differences.

Embodiment 3

[0050] A kind of polyamide compound material that is used for precision injection molded parts with large thickness difference of the present invention, it is made up of the raw material of following weight part:

[0051]

[0052] Among them, the stainless steel fiber masterbatch is the stainless steel fiber masterbatch of Beijing Jinfubang Fiber Technology Co., Ltd.; the talc powder has a particle size of 1500 mesh; the dendritic rheology modifier is a polymer of 1-3 generations Amidoamine dendrimers; the anti-shrinkage agent is a commercially available plastic inorganic anti-shrinkage agent of Zhangjiagang Younuo Chemical Co., Ltd.

[0053] The preparation method of the polyamide composite material is the same as in Example 1, and the same method as in Example 1 is used to make precision injection molded parts with large thickness differences.

[0054] The precision injection molded parts with large thickness difference made in the above three embodiments use the stainles...

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Abstract

The invention discloses a composite polyamide material for a large-thickness-tolerance precision injection molded part. The composite polyamide material is prepared from, by weight, 80-85 parts of nylon 6, 3-7 parts of stainless steel fiber masterbatch, 0.5-2 parts of montanic calcium, 0.2-1 part of talcum powder, 2-4 parts of oleic acid, 1-2 part of a dendritic rheological modifier and 0.5-1 part of an anti-shrinking agent. The composite polyamide material uses stainless steel fiber masterbatch as the modifier, utilizes high heat conductivity of stainless steel fiber to makes temperature at all portions of the injection molded part in the molding and cooling process more uniform, and accordingly the warping risk is effectively reduced. The anti-shrinking agent, the montanic calcium and the talcum powder are adopted as compound nucleating agents, the crystallization rate of polyamide resin is improved, the grain size is decreased, and accordingly shrinkage of the fabricated part is effectively decreased. The oleic acid and the dendritic rheological modifier are adopted as composite rheological modifiers, so that the composite polyamide material has better liquidity in a molten state, and accordingly liquidity degradation caused by the added stainless steel fiber is effectively relieved.

Description

technical field [0001] The invention relates to the technical field of precision injection molding, in particular to a polyamide composite material and an injection molding process for precision injection molded parts with large thickness differences. Large thickness difference precision injection molded parts. Background technique [0002] Precision injection molding requires products with high dimensional accuracy, low warpage and excellent transferability. However, when the thickness of the product is different, the shrinkage rate of the product is very different, and with the increase of the thickness of the product, the longitudinal shrinkage rate and transverse shrinkage rate of the product are increasing, because the cooling time at the thick wall is longer caused by long. Therefore, when producing precision injection molded parts with large thickness differences, there are often warping deformations or cracks caused by differences in shrinkage rates between differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L87/00C08K13/04C08K7/06C08K5/098C08K3/34C08K5/09B29C45/00B29K77/00
CPCC08L77/02B29C45/0001B29C45/0025B29K2077/00C08L87/00C08K13/04C08K7/06C08K5/098C08K3/34C08K5/09
Inventor 胡森川杨晋涛罗万象
Owner ZHEJIANG SENCHUAN FURNITURE
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