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Bi-component addition type mold silicone rubber for injection molding

An injection molding, two-component technology, applied in the field of mold silicone rubber, can solve the problems of uneven damage, bottom penetration, irregular size, etc.

Active Publication Date: 2015-07-01
CHENGDU TALY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mold molding conditions are mostly 80-90℃×30-60min. Due to manual operation, the product is often irregular in size. The obvious defect is that the thickness of each edge is uneven. In the process of repeated use, different parts of the same mold are damaged to varying degrees and are not durable

Method used

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  • Bi-component addition type mold silicone rubber for injection molding
  • Bi-component addition type mold silicone rubber for injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of base rubber with viscosity 5000cs vinyl silicone oil as the main oil

[0026] 100 parts by mass of aA200 fumed silica, 140 parts by mass of vinyl silicone oil with a viscosity of 5000cs (about 0.23% vinyl content), 15 parts by mass of hexamethyldisilazane, and 15 parts by mass of vinyltriethoxysilane 2 parts by mass and 2 parts by mass of distilled water were kneaded in a kneader for 2 hours, and the temperature was kept below 120°C during the kneading process;

[0027] b. Under the stirring state of the kneader, the temperature of the material is raised to 150°C, kneaded and dried under vacuum for 3 hours, during which the temperature gradually rises to 176°C;

[0028] c Add 85 parts by mass of 5000cs vinyl silicone oil, 15 parts by mass of methyl polysiloxane with a viscosity of 500cs, and continue kneading, heat the mixed rubber to 130°C, knead and dry under vacuum for 1 hour;

[0029] d. Discharging, the obtained material is ground on a three-roll...

Embodiment 2

[0037] 1. Preparation of base rubber with viscosity 10000cs vinyl silicone oil as the main oil

[0038] a 100 parts by mass of A380 fumed silica, 100 parts by mass of vinyl silicone oil (vinyl content about 0.19%) with a viscosity of 10000cs, 25 parts by mass of hexamethyldisilazane, vinyltriethoxysilane 3 parts by mass and 2.5 parts by mass of distilled water were kneaded in a kneader for 3 hours, and the temperature was kept below 120°C during the kneading process;

[0039] b. Add 4 parts by mass of distilled water into the kneader and knead for 1.5 hours below 120°C;

[0040] c. Under the stirring state of the kneader, the temperature of the material is raised to 160° C., and vacuum kneaded and dried for 3 hours;

[0041] d Add 130 parts by mass of 10000cs vinyl silicone oil, 20 parts by mass of methyl polysiloxane with a viscosity of 500cs) and continue kneading, heat the mixed rubber to 150°C, knead and dry in vacuum for 2 hours;

[0042] e discharge, the resulting mate...

Embodiment 3

[0050] 1. Preparation of base rubber with viscosity 15000cs vinyl silicone oil as the main oil

[0051]a 100 parts by mass of A380 fumed silica, 80 parts by mass of vinyl silicone oil with a viscosity of 15000cs (vinyl content about 0.14%), 30 parts by mass of hexamethyldisilazane, vinyltriethoxysilane 5 parts by mass and 3 parts by mass of distilled water were kneaded in a kneader for 4 hours, and the temperature was kept below 120°C during the kneading process;

[0052] b. Add 6 parts by mass of distilled water into the kneader and knead for 2 hours below 120°C;

[0053] c. Under the stirring state of the kneader, the temperature of the material is raised to 180° C., and vacuum kneaded and dried for 3 hours;

[0054] d Add 155 mass parts of 15000cs vinyl silicone oil, 25 mass parts of methyl polysiloxane with a viscosity of 500cs) and continue kneading, the mixed rubber material is heated up to 180°C, vacuum kneaded and dried for 2 hours;

[0055] e discharge, the resultin...

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Abstract

The invention discloses a bi-component addition type mold silicone rubber for injection molding. The silicone rubber is cured and molded by using A and B components, wherein the A component comprises the following components in parts by mass: 100 parts of base silica gel, 0.1-0.30 part of platinum complex catalyst, 0.1-2.0 part of polymerization inhibitor which is alkynol and vinyl ring-body compound, and 0-10 parts of vinyl silicone oil; the B component comprises the following components in parts by mass: 0-100 parts of vinyl silicone oil, 4-15 parts, preferably 5-10 parts of one or more hydrogen polysiloxanes, and 0-20 parts of vinyl silicone oil. The silicone rubber is used for preparing silicone rubber mold through injection molding and mainly suitable for fast injection molding, the obtained product is good in extrusion property, easy for demolding after being molded, good in mechanical property, free of volatile byproducts in the vulcanizing process, low in shrinkage percentage, internally and externally vulcanized at the same time, good in rebound resilience, wide in application, and can be applied to preparing various injection molded products such as artificial jewelry; the silicone rubber can be reused many times, the higher the reuse frequency is, the better the performance is.

Description

technical field [0001] The invention relates to mold silicone rubber, in particular to a two-component addition mold silicone rubber for injection molding, which is used for preparing artificial jewelry molds for decoration. technical background [0002] With the improvement of people's material living standards, the pursuit of beautiful things is getting higher and higher. Artificial jewelry can be seen everywhere in daily necessities, such as clothes, shoes, backpacks, hairpins, various decorations, etc. Artificial diamonds of various sizes and shapes, along with the processing of artificial diamonds, has also derived a mold manufacturing industry for artificial jewelry. Silicone rubber molds have become a One of the commonly used ones, the patent No. 201010528261.2, provides a liquid silicone rubber composition and its preparation method, which is also suitable for injection molding, but it is only suitable for silicone rubber sponges due to different processes and compon...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/06C08L83/05C08L83/04C08K3/36C08K5/5445C08K5/5425
Inventor 陶云峰刘会娟张先银方辉陶冶刘世成郑丽萍
Owner CHENGDU TALY TECH CO LTD
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