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High-strength addition-type mould rubber composition and preparation method thereof

A composition and additive molding technology, which is applied in the field of mold glue, can solve the problems of reducing mold glue turning times and quality, reducing mold glue heat shrinkage, and low tear strength, so as to improve mold turning quality and improve The effect of turning over times and improving the mechanical strength

Active Publication Date: 2016-01-20
ZHEJIANG XINAN CHEM INDAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN201410557237.X proposes to use supramolecular montmorillonite to strengthen mold glue, which can improve the thermal stability and tensile strength of mold glue; patent CN201310414939.8 discloses a new type of mold glue and its preparation method. The organic-inorganic synergistic toughening effect of ester and silicon micropowder reduces the thermal shrinkage rate of the prepared mold glue and improves the heat resistance; patent CN201310092828. The heat shrinkage rate of the mold glue; none of the above patents involves the tear strength of the mold glue, which is difficult to use in high-precision mold making
Patent CN201310738428.1 discloses a preparation method of addition-type mold glue, which can be used to make crystal diamonds, and has the advantages of high mold turning times and long service life, but the tear strength of the mold glue prepared by this patent is less than 30kN / m, which is not conducive to Production of high-precision molds and exquisite replicas
[0004] In view of the poor mechanical properties of the above-mentioned addition-type mold adhesives, especially the low tear strength, it seriously affects the service life of the addition-type mold adhesives, and reduces the number of times and quality of mold-turning mold adhesives

Method used

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  • High-strength addition-type mould rubber composition and preparation method thereof
  • High-strength addition-type mould rubber composition and preparation method thereof
  • High-strength addition-type mould rubber composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Base rubber preparation: 60 parts of 10000mPa·s vinyl-terminated silicone oil with a specific surface area of ​​300m 2 Add 32 parts / g of fumed silica (Japan Tokuyama QS-30), 8 parts of hexamethylsilazane, and 1.6 parts of water into the kneader, stir at room temperature for 1 hour, then raise the temperature to 150°C and continue stirring After 2 hours, finally add 40 parts of 10000mPa·s vinyl-terminated silicone oil to dilute, and obtain the base rubber after cooling.

[0038] Preparation of component A: Take 87.5 g of the above base glue, add 0.1 g of platinum catalyst (platinum content is 3000 ppm), and stir evenly.

[0039] Preparation of component B: Take 44.6g of the above base glue, add vinyl silicone resin (the amount of vinyl groups is 4.44×10 -4 mol / g) 20g, high-concentration vinyl silicone oil (vinyl group content 1.35×10 -3 mol / g) 5g, hydrogen-containing silicone oil containing only hydrogen in the side chain (SiH group amount 8.0×10 -3 mol / g) 14g, hydrog...

Embodiment 2

[0042] Base rubber preparation: 60 parts of 10000mPa·s vinyl-terminated silicone oil with a specific surface area of ​​300m 2 Add 30 parts / g of fumed silica (Japan Tokuyama QS-30), 7.5 parts of hexamethylsilazane, and 1.5 parts of water into the kneader, stir at room temperature for 1 hour, then raise the temperature to 150°C and continue stirring After 2 hours, finally add 40 parts of 10000mPa·s vinyl-terminated silicone oil to dilute, and obtain the base rubber after cooling.

[0043] Preparation of component A: Take 77.5 g of the above base glue, add 0.1 g of platinum catalyst (platinum content is 3000 ppm), and stir evenly.

[0044] Preparation of component B: Take 52.5g of the above base glue, add vinyl silicone resin (the amount of vinyl groups is 4.44×10 -4 mol / g) 10g, high-concentration vinyl silicone oil (vinyl group content 1.35×10 -3 mol / g) 5g, hydrogen-containing silicone oil containing only hydrogen in the side chain (SiH group amount 8.0×10 -3 mol / g) 9.1g, hyd...

Embodiment 3

[0047] Base rubber preparation: 60 parts of 10000mPa·s vinyl-terminated silicone oil with a specific surface area of ​​300m 2 Add 32 parts / g of fumed silica (Japan Tokuyama QS-30), 8 parts of hexamethylsilazane, and 1.6 parts of water into the kneader, stir at room temperature for 1 hour, then raise the temperature to 150°C and continue stirring After 2 hours, finally add 40 parts of 10000mPa·s vinyl-terminated silicone oil to dilute, and obtain the base rubber after cooling.

[0048] Preparation of component A: Take 87.5 g of the above base glue, add 0.1 g of platinum catalyst (platinum content is 3000 ppm), and stir evenly.

[0049] Preparation of component B: Take 44.6g of the above base glue, add vinyl silicone resin (the amount of vinyl groups is 4.44×10 -4 mol / g) 20g, high concentration vinyl silicone oil (vinyl group content 4×10 -4 mol / g) 5g, cross-linking agent hydrogen-containing silicone oil (SiH group content 8.0×10-3mol / g) 14g, only hydrogen-containing chain ext...

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Abstract

The invention provides a high-strength addition-type mould rubber composition and a preparation method thereof. The composition comprises high-concentration vinyl silicone oil which can form a local high crosslink density meshwork in the preparing process and play an anchoring role together with vinyl silicone resin and white carbon black in the composition, therefore, the mechanical strength of addition-type mould rubber is improved, the tearing strength can be more than 30 N / m, the mould turning times is significantly increased, the mould turning quality is significantly improved, and the composition can be used for high-precision model making.

Description

technical field [0001] The invention relates to the technical field of mold glue, in particular to an addition-type mold glue, in particular to a high-strength addition-type mold glue composition and a preparation method thereof. Background technique [0002] Mold glue can be divided into addition mold glue and condensation mold glue. Since the condensation mold glue will release small molecules (such as methanol) during the curing process, it will cause pollution and is not environmentally friendly, and its deep curing is not good, so it is not suitable Applied to thicker products. Compared with condensation-type mold glue, addition-type mold glue does not release small molecules when cured, it is easy to deep-cure, the linear shrinkage rate is less than 0.1%, and the dimensional stability is better. It is more suitable for the production of precision molds and delicate replicas. [0003] Patent CN201410557237.X proposes to use supramolecular montmorillonite to strengthen ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K3/36
Inventor 胡杨飞王轲徐晓明吴克金红君易万彬应流渊朱利明吴欣宏
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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