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PVC injection molding material and PVC injection molding method capable of forming high-light mirror surface effect on surface of product

A 37% PVC, product technology, applied in the field of PVC injection molding, can solve the problems of high-gloss mirror effect on the surface of the product, poor thermal stability of PVC, poor heat resistance of PVC materials, etc., to achieve the benefit of heat and shear Force transmission, shortening plasticizing time, and avoiding the effect of high shear force

Inactive Publication Date: 2018-03-02
常熟利星光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] PVC has poor thermal stability, the molding temperature is close to the decomposition temperature, the fluidity is not good, and the appearance is easy to form bad defects. Product surface appearance is poor
At present, the consumer market has higher requirements for the appearance and visual experience of products. Therefore, in order to obtain a certain appearance quality, a large part of PVC products sometimes need to form a high-gloss mirror effect on the surface of the product. However, in the existing Ordinary PVC materials and injection molding methods are difficult to form a high-gloss mirror effect on the surface of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix and stir the following components by weight percentage evenly: 30% PVC resin, 25% dioctyl terephthalate, 38% calcium carbonate, 5% stabilizer, 2% methyl methacrylate and acrylonitrile copolymer .

[0027] (2) The above-mentioned components were heated to a molten state of 175°C.

[0028] (3) Clamping the mold. The mold for clamping the mold is composed of an upper mold, a lower mold and a mold handle. The part of the high-gloss mirror effect of the mold is processed by the high-gloss mold material (specifically processed by the high-gloss mold material Hitachi S136), and the high-gloss of the mold The parts with mirror effect are separately inserted into the mold body with the insert structure. A plurality of exhaust grooves are provided on the contact surface between the independent insert and the main body core, the width of the exhaust grooves is 5mm, the depth is 0.01mm, and the interval between the exhaust grooves is 4mm.

[0029] (4) Filling, injection m...

Embodiment 2

[0035] The method of this embodiment and the method of embodiment 1 are except the following difference, all the other are identical:

[0036] Component weight percent: 37% PVC resin, 22% dioctyl terephthalate, 35.5% calcium carbonate, 4% stabilizer, 1.5% methyl methacrylate and acrylonitrile copolymer.

[0037] In the step (2), the components are heated to 175°C.

[0038] The width of the exhaust grooves on the independent insert is 5.5mm, the depth is 0.015mm, and the interval between the exhaust grooves is 4.5mm.

[0039]The injection pressure of the first stage of the injection molding machine is 23Bar, the flow rate is 20mm / s, and the injection time is 3s; the injection pressure of the second stage is 18Bar, the flow rate is 20mm / s, and the injection time is 2s; the injection pressure of the third stage is 16Bar, and the flow rate is 15mm / s, injection time is 2s.

[0040] The distance between the cooling water channel and the product surface is 6mm.

[0041] The injec...

Embodiment 3

[0043] The method of this embodiment and the method of embodiment 1 are except the following difference, all the other are identical:

[0044] Component weight percent: 50% PVC resin, 15% dioctyl terephthalate, 31% calcium carbonate, 2% stabilizer, 2% methyl methacrylate and acrylonitrile copolymer.

[0045] In the step (2), the components are heated to 180°C.

[0046] The width of the exhaust grooves on the independent inserts is 6mm, the depth is 0.02mm, and the interval between the exhaust grooves is 5mm.

[0047] The injection pressure of the first stage of the injection molding machine is 30Bar, the flow rate is 15mm / s, and the injection time is 2s; the injection pressure of the second stage is 30Bar, the flow rate is 40mm / s, and the injection time is 3s; the injection pressure of the third stage is 25Bar, and the flow rate is 25mm / s, injection time is 3s.

[0048] The distance between the cooling water channel and the product surface is 8mm.

[0049] The injection mo...

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Abstract

The invention discloses a PVC injection molding material and a PVC injection molding method capable of forming a high-light mirror surface effect on the surface of a product. The PVC injection moldingmaterial comprises the components in percentage by weight: 30-50% of PVC resin, 15-25% of dioctyl terephthalate, 18.5-38% of calcium carbonate, 2-8% of stabilizer and 1.5-2% of methyl methacrylate and acrylonitrile copolymers. The injection molding method comprises the steps: firstly, uniformly stirring the components; heating the components to be in a molten state; closing a mold; carrying out filling, carrying out injection molding by an injection molding machine, wherein the injection molding pressure at the first stage is 15-30Bar, the flow at the first stage is 15-35mm / s, the injection molding time at the first stage is 2-5s, the injection molding pressure at the second stage is 15-30Bar, the flow at the second stage is 20-40mm / s, the injection molding time at the second stage is 1-3s, the injection molding pressure at the third stage is 10-25Bar, the flow at the third stage is 10-25mm / s, and the injection molding time at the third stage is 2-4s; maintaining the pressure; carrying out cooling; and carrying out demolding. By using the injection molding method disclosed by the invention, a high-light mirror surface effect can be formed on the surface of the product, the requirement of a terminal client to the appearance of the product can be met, and meanwhile, the competitiveness of the product on the market can be improved.

Description

technical field [0001] The invention relates to a PVC injection molding material, and also relates to a PVC injection molding method, in particular to a PVC injection molding method capable of forming a high-gloss mirror effect on the surface of a product. Background technique [0002] PVC has poor thermal stability, the molding temperature is close to the decomposition temperature, the fluidity is not good, and the appearance is easy to form bad defects. Product surface appearance is poor. At present, the consumer market has higher requirements for the appearance and visual experience of products. Therefore, in order to obtain a certain appearance quality, a large part of PVC products sometimes need to form a high-gloss mirror effect on the surface of the product. However, in the existing Ordinary PVC materials and injection molding methods are difficult to form a high-gloss mirror effect on the surface of the product. Contents of the invention [0003] The object of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L33/12C08K5/12C08K3/26B29C45/26B29C45/34B29C45/72B29C45/76B29C45/77
CPCB29C45/2602B29C45/34B29C45/7207B29C45/76B29C45/77B29C2945/76498B29C2945/76545B29C2945/76561B29C2945/76829B29C2945/76862C08K2003/265C08L27/06C08L33/12C08K5/12C08K3/26
Inventor 田军林明俊徐海庄锦强朱冬琴陈波瀚
Owner 常熟利星光电科技有限公司
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