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Raw material composition for manufacturing quasi-isostatic soft die, quasi-isostatic soft die and manufacturing method thereof

A raw material composition and quasi-isostatic pressing technology, which is applied in the field of mold manufacturing, can solve the problems of the raw material formulation of silicone rubber and the soft mold manufacturing process to be improved, difficult to manufacture process characteristics and mechanical characteristics, etc.

Inactive Publication Date: 2017-08-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercially available silicone rubber raw materials are difficult to adapt to the manufacturing process characteristics and mechanical properties of this soft mold
[0005] Therefore, in response to the above special requirements, the silicone rubber raw material formula and soft mold manufacturing process still need to be improved

Method used

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  • Raw material composition for manufacturing quasi-isostatic soft die, quasi-isostatic soft die and manufacturing method thereof
  • Raw material composition for manufacturing quasi-isostatic soft die, quasi-isostatic soft die and manufacturing method thereof
  • Raw material composition for manufacturing quasi-isostatic soft die, quasi-isostatic soft die and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] In this example, a raw material composition for making a quasi-isostatic soft mold is prepared. Wherein, the specific composition of this raw material composition comprises (calculated by mass):

[0081] 5000g α,ω-Dihydroxypolysiloxane (HO(Me 2 SiO) n OH), its viscosity at 25°C is 20Pa·s;

[0082] 40g of dehydrated silica powder with an average particle size of 20nm and a specific surface area of ​​450m 2 / g;

[0083] 40g of calcium carbonate powder with an average particle size of 50nm and a specific surface of 30m 2 / g;

[0084] 35g of quartz powder with an average particle size of 3 microns;

[0085] 300g Me 3 SiO(Me 2 SiO) n SiMe 3 , its viscosity at 25°C is 1.5Pa·s;

[0086] 50g dibenzoyl peroxide (BP) powder;

[0087] 50g dichlorobenzoyl peroxide (DCBP) powder;

[0088] 200g simethicone oil;

[0089] 5 g platinum catalyst.

[0090] The specific mixing step is to mix the above raw material composition in a mixing tank, and the temperature in the mixi...

Embodiment 2

[0093] In this embodiment, according to the mixing step in embodiment 1, the raw material composition of following formula is mixed:

[0094] 5000g α,ω-Dihydroxypolysiloxane (HO(Me 2 SiO) n OH), its viscosity at 25°C is 20Pa·s;

[0095] 20g of dehydrated silica powder with an average particle size of 20nm and a specific surface area of ​​450m 2 / g;

[0096] 20g of calcium carbonate powder with an average particle size of 50nm and a specific surface of 30m 2 / g;

[0097] 10g of quartz powder with an average particle size of 3 microns;

[0098] 300g Me 3 SiO(Me 2 SiO) n SiMe 3 , its viscosity at 25°C is 1.5Pa·s;

[0099] 50g dibenzoyl peroxide (BP) powder;

[0100] 50g dichlorobenzoyl peroxide (DCBP) powder;

[0101] 5 g platinum catalyst.

[0102] The specific mixing step is to mix the above raw material composition in a mixing tank, and the temperature in the mixing tank is controlled by a constant temperature water bath, the set temperature is 5°C, and the temper...

Embodiment 3

[0118] In this embodiment, according to the mixing step in embodiment 1, the raw material composition of following formula is mixed:

[0119] 5000g α,ω-Dihydroxypolysiloxane (HO(Me 2 SiO) n OH), its viscosity at 25°C is 20Pa·s;

[0120] 40g of dehydrated silica powder with an average particle size of 20nm and a specific surface area of ​​450m 2 / g;

[0121] 40g of calcium carbonate powder with an average particle size of 50nm and a specific surface of 30m 2 / g;

[0122] 35g of quartz powder with an average particle size of 3 microns;

[0123] 200g Me 3 SiO(Me 2 SiO) n SiMe 3 , its viscosity at 25°C is 1.5Pa·s;

[0124] 30g dibenzoyl peroxide (BP) powder;

[0125] 30g of dichlorobenzoyl peroxide (DCBP) powder;

[0126] 200g simethicone oil;

[0127] 5 g platinum catalyst.

[0128]The specific mixing step is to mix the above raw material composition in a mixing tank, and the temperature in the mixing tank is controlled by a constant temperature water bath, the set ...

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Abstract

The invention provides a raw material composition, a quasi-isostatic soft die and a manufacturing method thereof. The raw material composition is prepared from the following components in parts by weight: 100 parts of a basic polymer, 18 to 26 parts of filler, 60 to 80 parts of a plasticizer, 20 to 30 parts of a vulcanizing agent, 40 to 50 parts of a vulcanizing agent dispersant and 0.5 to 3 parts of a catalyst. The raw material composition provided by the invention has good stability, no volatility and relatively low viscosity after being mixed at 5 DEG C to 10 DEG C and machining requirements on vacuum pouring for manufacturing the quasi-isostatic soft die are met; no harmful substances are decomposed and volatilized so that the raw material composition is environmentally-friendly and safe; the manufactured quasi-isostatic soft die has high strength and a good force transmission property, so that an element ball manufactured by the quasi-isostatic soft die has relatively small thermodynamic anisotropy.

Description

technical field [0001] The invention relates to the technical field of mold manufacturing, in particular, the invention relates to a raw material composition for manufacturing a quasi-isostatic soft mold, a quasi-isostatic soft mold and a manufacturing method thereof. Background technique [0002] At present, the quasi-isostatic pressing molds commonly used in powder metallurgy include plastic soft molds, rubber soft molds, and zinc stearate powder fillers. These molds for quasi-isostatic pressing all have the advantages of a large working pressure range of the force transmission medium, easy operation, and the ability to manufacture compacts with complex shapes and uniform densities. Among them, silicone rubber has the characteristics of good elasticity, good anti-aging performance, non-toxic or low toxicity, and easy realization of molding operation conditions, and is an ideal material for soft molds. [0003] The diameter of the spherical fuel element used in the pebble ...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08L83/04C08K13/02C08K3/36C08K3/26C08K5/14B29C35/02B22F3/03
Inventor 卢振明张杰周湘文刘兵唐亚平
Owner TSINGHUA UNIV