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Two-component high-tear-resistance liquid silicone rubber for mold production, and preparation method thereof

A liquid silicone rubber, two-component technology, used in the field of two-component high tear-resistant liquid silicone rubber for molding and its preparation, can solve the problems of poor leveling, hardening, and brittleness, and achieve good flow The effect of flatness

Active Publication Date: 2016-03-09
汕头市科源有机硅材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The tear strength of the silicone rubber mold is not high. When the tear resistance is 10-15KN / m, the number of mold turning is about 21-25 times, and when the tear resistance is 20-25KN / m, the number of mold turning is about 30 times. The number of times should reach about 40 times, then the tear resistance must reach more than 30KN / m. After measuring, the two-component high-tear-resistant liquid silicone rubber for molding will thicken, and the leveling property will deteriorate, resulting in loss of use value
[0004] 2. Silicone rubber molds are not resistant to the erosion of epoxy resin ammonia curing agent and active diluent. Silicone rubber molds will cause the silicone rubber molecular chain to break, age, harden and become brittle during repeated use of epoxy resin. Caused damage to the silicone rubber mold

Method used

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  • Two-component high-tear-resistance liquid silicone rubber for mold production, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A two-component high-tear-resistant liquid silicone rubber for molding according to an embodiment of the present invention includes the following components by weight:

[0034] Component A:

[0035] Vinyl-terminated polydimethylsiloxane: 100 parts;

[0036] (ViMe 2 SiO(Me 2 SiO) a SiMe 2 Vi where a=550, viscosity 8000mpa.s)

[0037] Terminal chain and side chain high vinyl polydimethylsiloxane: 5 parts;

[0038] (ViMe 2 SiO(Me 2 SiO) b (MeViSiO) c SiMe 2 Vi, where b=700, c=50, viscosity 16000mpa.s)

[0039] Terminal hydroxyl side chain vinyl polydimethylsiloxane: 15 parts;

[0040] (HOME 2 SiO((Me 2 SiO) e (MeViSiO) f SiMe 2 OH, where e=100, f=3, viscosity 1000mpa.s)

[0041] Fumed silica: 30 parts;

[0042] (with a surface area of ​​200m 2 / g)

[0043] Catalyst: 0.6 parts;

[0044] (H 2 PtCl 6 THF solution 2000ppm)

[0045] Component A materials are made by the following steps:

[0046]Put 100 parts of vinyl polydimethylsiloxane with a viscosi...

Embodiment 2

[0061] A two-component high-tear-resistant liquid silicone rubber for molding according to an embodiment of the present invention includes the following components by weight:

[0062] A component material:

[0063] Vinyl-terminated polydimethylsiloxane: 100 parts;

[0064] (ViMe 2 SiO(Me 2 SiO) a SiMe 2 Vi, where a=600, viscosity 10000mpa.s)

[0065] Terminal chain and side chain high vinyl polydimethylsiloxane: 10 parts;

[0066] (ViMe 2 SiO(Me 2 SiO) b (MeViSiO) c SiMe 2 Vi, where b=750, c=75, viscosity 20000mpa.s)

[0067] Terminal hydroxyl side chain vinyl polydimethylsiloxane: 20 parts;

[0068] (HOME 2 SiO((Me 2 SiO) e (MeViSiO) f SiMe 2 OH, where e=150, f=6, viscosity 2000mpa.s)

[0069] Fumed silica: 38 parts;

[0070] (with a surface area of ​​300m 2 / g)

[0071] Catalyst: 1.0 parts;

[0072] (H 2 PtCl 6 THF solution / Pt[(ViMe2Si)2O]2=1:12500ppm)

[0073] Component A materials are made by the following steps:

[0074] Put 100 parts of vinyl po...

Embodiment 3

[0087] A two-component high-tear-resistant liquid silicone rubber for molding according to an embodiment of the present invention includes the following components by weight:

[0088] Component A:

[0089] Vinyl-terminated polydimethylsiloxane: 100 parts;

[0090] (ViMe 2 SiO(Me 2 SiO) a SiMe 2 Vi, where a=650, viscosity 12000mpa.s)

[0091] Terminal chain and side chain high vinyl polydimethylsiloxane: 15 parts;

[0092] (ViMe 2 SiO(Me 2 SiO) b (MeViSiO) c SiMe 2 Vi, where b=800, c=100, viscosity 24000mpa.s)

[0093] Terminal hydroxyl side chain vinyl polydimethylsiloxane: 25 parts;

[0094] (HOME 2 SiO((Me 2 SiO) e (MeViSiO) f SiMe 2 OH, where e=200, f=8, viscosity 3000mpa.s)

[0095] Fumed silica: 45 parts;

[0096] (with a surface area of ​​380m 2 / g)

[0097] Catalyst: 1.4 parts;

[0098] (Pt[(ViMe 2 Si) 2 O] 2 3000ppm)

[0099] Component A materials are made by the following steps:

[0100]Put 100 parts of vinyl polydimethylsiloxane with a visc...

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Abstract

Embodiments of the present invention disclose a two-component high-tear-resistance liquid silicone rubber for mold production. The two-component high-tear-resistance liquid silicone rubber comprises a component A and a component B, wherein the component A comprises vinyl-terminated polydimethylsiloxane, terminating chain and side chain high vinyl polydimethylsiloxane, terminating chain hydroxy side chain vinyl polydimethylsiloxane, fumed silica and a catalyst, and the component B comprises vinyl-terminated polydimethylsiloxane, polydimethylsiloxane with a terminating chain containing hydrogen and a side chain containing hydrogen, an alkynol reaction inhibitor, and a free radical scavenger. Embodiments of the present invention further disclose a preparation method of the two-component high-tear-resistance liquid silicone rubber. With the two-component high-tear-resistance liquid silicone rubber of the present invention, the two-component high-tear-resistance liquid silicone rubber vulcanization precursor rubber material has good leveling property, the tear resistance after vulcanization molding is greater than 30 KN / m, the silicone rubber mold has epoxy resin corrosion resistance, the number of the rolling over of the mold achieves 45, and the silicone rubber mold has characteristics of good prevention of silicone rubber molecular chain from breaking, aging, hardening, and brittleness.

Description

technical field [0001] The invention relates to the field of silicone polymers, in particular to a two-component high tear-resistant liquid silicone rubber for molding and a preparation method thereof. Background technique [0002] With the increasing demand for decorative products in China, Europe, America, India, and the Middle East, a large number of enterprises producing lighting accessories, clothing accessories, shoes and hat accessories, handicrafts, nail accessories, mobile phone accessories, etc. have emerged in China. The vast majority of them are ornaments molded by epoxy resin, and the molding of epoxy resin is based on the vulcanized two-component liquid silicone rubber as the master mold, that is, the silicone rubber mold is molded. After turning over the mold 21 to 25 times, there will be cracks at the edges and corners of the silicone rubber mold, and more seriously, the entire silicone rubber mold will crack. The reasons for the cracking of the silicone rubb...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/06C08K3/36
CPCC08L83/04C08L2205/025C08L2205/035C08L83/06C08K3/36
Inventor 赵杨
Owner 汕头市科源有机硅材料有限公司
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