CN113652092A - Tear-resistant mold silicone rubber and preparation method thereof - Google Patents
Tear-resistant mold silicone rubber and preparation method thereof Download PDFInfo
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- CN113652092A CN113652092A CN202111020883.9A CN202111020883A CN113652092A CN 113652092 A CN113652092 A CN 113652092A CN 202111020883 A CN202111020883 A CN 202111020883A CN 113652092 A CN113652092 A CN 113652092A
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- silicone rubber
- polydimethylsiloxane
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a tear-resistant mold silicon rubber which comprises the following components in parts by mass: 100-120 parts of terminal vinyl polydimethylsiloxane, 5-15 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 15-25 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 30-45 parts of fumed silica, 0.6-1.4 parts of catalyst, 10-30 parts of terminal vinyl polydimethylsiloxane, 70-90 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.2-0.6 part of alkynol reaction inhibitor and 0.1-0.2 part of free radical scavenger. The invention also discloses a preparation method of the tear-resistant mold silicone rubber, and a product is obtained through kneading, vacuumizing, stirring, filtering, defoaming and vulcanization molding. The invention has the advantages of good tear resistance and stable performance.
Description
Technical Field
The invention relates to the technical field of organic silica gel materials, in particular to tear-resistant mold silicone rubber and a preparation method thereof.
Background
With the increasing demand of decorative products in China, Europe and America, India and middle east, enterprises for producing lamp ornaments, clothes ornaments, shoe and hat ornaments, artware, manicure ornaments, mobile phone ornaments and the like in large scale emerge in China. Most of the ornaments that are epoxy resin shaping wherein, and epoxy's shaping all is the two ingredient liquid silicon rubbers after the vulcanization as the primary type that silicon rubber mould turnover shaping, and the general turnover of silicon rubber mould will appear silicon rubber mould edge edges and corners department and take place the breach after 21 ~ 25 times on the market at present stage, and more serious is whole silicon rubber mould fracture, causes silicon rubber mould fracture and turnover number of times reason for a little to be few to the side: the silicon rubber mold has low tearing strength and is not resistant to the erosion of epoxy resin ammonia curing agent, reactive diluent and the like.
Disclosure of Invention
The invention aims to provide a tear-resistant mold silicone rubber and a preparation method thereof, so as to solve the problems in the background technology.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the tear-resistant mold silicon rubber is characterized by comprising the following components in parts by mass: 100-120 parts of terminal vinyl polydimethylsiloxane, 5-15 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 15-25 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 30-45 parts of fumed silica, 0.6-1.4 parts of catalyst, 10-30 parts of terminal vinyl polydimethylsiloxane, 70-90 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.2-0.6 part of alkynol reaction inhibitor and 0.1-0.2 part of free radical scavenger.
The preparation method of the tear-resistant mold silicone rubber is characterized by comprising the following steps:
s1, putting vinyl-terminated polydimethylsiloxane, a terminal chain and side chain high-vinyl polydimethylsiloxane into a kneader, putting fumed silica, a silica treating agent and pure water into the kneader in batches, and uniformly mixing the materials in the kneader to obtain a liquid silicone rubber base mixture A;
s2, putting the mixture A prepared in the step S1 into a kneader for kneading to obtain a mixture B;
s3, performing vacuum pumping treatment on the mixture B prepared in the step S2 to obtain a mixture C;
s4, cooling and grinding the mixture C prepared in the step S3 to obtain liquid silicone rubber base rubber D;
s5, adding end-chain hydroxyl side chain vinyl polydimethylsiloxane and a catalyst into the liquid silicone rubber base rubber D prepared in the step S4, uniformly stirring, and filtering to obtain a two-component high-tear-resistance liquid silicone rubber component A for mold preparation;
s6, uniformly stirring and filtering vinyl-terminated polydimethylsiloxane, terminal chain and side chain hydrogen-containing polydimethylsiloxane, alkynol reaction inhibitor and free radical scavenger to obtain a double-component high-tear-resistance liquid silicone rubber component B for the mold making;
s7, mixing the component A prepared in the step S5 and the component B prepared in the subsequent step S6 according to the weight ratio of 10: 1-2, stirring uniformly, defoaming, and vulcanizing and forming at 90-110 ℃ to obtain a finished product.
Further, the catalyst is a vinyl Pt complex catalyst.
Further, the alkynol reaction inhibitor is one of propargyl alcohol, propargyl alcohol or ethynyl methanol.
Further, the kneading process in step S2 is performed in the following manner: kneading for 2-3 h at 80-120 ℃, and heating to 150-180 ℃ for heat treatment for 2-3 h. .
Further, the pressure of the vacuum-pumping treatment in the step S3 is more than-0.09 MPa, and the vacuum-pumping time is 2-3 h.
Furthermore, the time for vulcanization molding in the step S7 is 25-30 min.
Compared with the prior art, the beneficial effects are:
according to the anti-tearing mold silicon rubber, the terminal chain and side chain high vinyl polydimethylsiloxane used in the raw materials have an obvious effect on improving the anti-tearing performance of the silicon rubber mold, the terminal chain hydroxyl side chain vinyl polydimethylsiloxane can reduce the crosslinking density of the silicon rubber mold and has an obvious effect on improving the anti-tearing performance, and the terminal hydrogen molecular chain has an obvious effect on improving the elongation and anti-tearing performance of the silicon rubber mold. The silicone rubber has good leveling property, resists epoxy resin corrosion, and has better performance of preventing silicon rubber molecular chains from bond scission, aging, hardening and embrittlement.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example 1
The tear-resistant mold silicon rubber is characterized by comprising the following components in parts by mass: 100 parts of terminal vinyl polydimethylsiloxane, 10 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 21 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 32 parts of fumed silica, 1.2 parts of catalyst, 19 parts of terminal vinyl polydimethylsiloxane, 78 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.4 part of alkynol reaction inhibitor and 0.13 part of free radical scavenger.
Wherein the catalyst is a vinyl Pt complex catalyst.
Wherein the alkynol reaction inhibitor is ethynyl methanol.
Example 2
The tear-resistant mold silicon rubber is characterized by comprising the following components in parts by mass: 115 parts of terminal vinyl polydimethylsiloxane, 9 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 18 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 37 parts of fumed silica, 0.7 part of catalyst, 25 parts of terminal vinyl polydimethylsiloxane, 85 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.3 part of alkynol reaction inhibitor and 0.1 part of free radical scavenger.
Wherein the catalyst is a vinyl Pt complex catalyst.
Wherein the alkynol reaction inhibitor is propargyl alcohol.
Example 3
The tear-resistant mold silicon rubber is characterized by comprising the following components in parts by mass: 106 parts of terminal vinyl polydimethylsiloxane, 14 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 16 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 35 parts of fumed silica, 1.3 parts of catalyst, 15 parts of terminal vinyl polydimethylsiloxane, 75 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.25 part of alkynol reaction inhibitor and 0.16 part of free radical scavenger.
Wherein the catalyst is a vinyl Pt complex catalyst.
Wherein the alkynol reaction inhibitor is propargyl alcohol.
The tear-resistant mold silicone rubber of embodiments 1 to 3 is prepared by the following method:
the preparation method of the tear-resistant mold silicone rubber is characterized by comprising the following steps:
s1, putting vinyl-terminated polydimethylsiloxane, a terminal chain and side chain high-vinyl polydimethylsiloxane into a kneader, putting fumed silica, a silica treating agent and pure water into the kneader in batches, and uniformly mixing the materials in the kneader to obtain a liquid silicone rubber base mixture A;
s2, putting the mixture A prepared in the step S1 into a kneader for kneading to obtain a mixture B;
s3, performing vacuum pumping treatment on the mixture B prepared in the step S2 to obtain a mixture C;
s4, cooling and grinding the mixture C prepared in the step S3 to obtain liquid silicone rubber base rubber D;
s5, adding end-chain hydroxyl side chain vinyl polydimethylsiloxane and a catalyst into the liquid silicone rubber base rubber D prepared in the step S4, uniformly stirring, and filtering to obtain a two-component high-tear-resistance liquid silicone rubber component A for mold preparation;
s6, uniformly stirring and filtering vinyl-terminated polydimethylsiloxane, terminal chain and side chain hydrogen-containing polydimethylsiloxane, alkynol reaction inhibitor and free radical scavenger to obtain a double-component high-tear-resistance liquid silicone rubber component B for the mold making;
s7, mixing the component A prepared in the step S5 and the component B prepared in the subsequent step S6 according to the weight ratio of 10: 1-2, stirring uniformly, defoaming, and vulcanizing and forming at 90-110 ℃ to obtain a finished product.
Specifically, the kneading process in step S2 is performed in the following manner: kneading for 2-3 h at 80-120 ℃, and heating to 150-180 ℃ for heat treatment for 2-3 h. .
Specifically, the pressure of the vacuum-pumping treatment in the step S3 is more than-0.09 MPa, and the vacuum-pumping time is 2-3 h.
Specifically, the time for vulcanization molding in the step S7 is 25-30 min.
The above embodiments are not limited to the above embodiments, and those skilled in the art will appreciate that the idea of the present invention and make various extensions and changes according to the above embodiments, but they are within the scope of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The tear-resistant mold silicon rubber is characterized by comprising the following components in parts by mass: 100-120 parts of terminal vinyl polydimethylsiloxane, 5-15 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 15-25 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 30-45 parts of fumed silica, 0.6-1.4 parts of catalyst, 10-30 parts of terminal vinyl polydimethylsiloxane, 70-90 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.2-0.6 part of alkynol reaction inhibitor and 0.1-0.2 part of free radical scavenger.
2. The preparation method of the tear-resistant mold silicone rubber is characterized by comprising the following steps:
s1, putting vinyl-terminated polydimethylsiloxane, a terminal chain and side chain high-vinyl polydimethylsiloxane into a kneader, putting fumed silica, a silica treating agent and pure water into the kneader in batches, and uniformly mixing the materials in the kneader to obtain a liquid silicone rubber base mixture A;
s2, putting the mixture A prepared in the step S1 into a kneader for kneading to obtain a mixture B;
s3, performing vacuum pumping treatment on the mixture B prepared in the step S2 to obtain a mixture C;
s4, cooling and grinding the mixture C prepared in the step S3 to obtain liquid silicone rubber base rubber D;
s5, adding end-chain hydroxyl side chain vinyl polydimethylsiloxane and a catalyst into the liquid silicone rubber base rubber D prepared in the step S4, uniformly stirring, and filtering to obtain a two-component high-tear-resistance liquid silicone rubber component A for mold preparation;
s6, uniformly stirring and filtering vinyl-terminated polydimethylsiloxane, terminal chain and side chain hydrogen-containing polydimethylsiloxane, alkynol reaction inhibitor and free radical scavenger to obtain a double-component high-tear-resistance liquid silicone rubber component B for the mold making;
s7, mixing the component A prepared in the step S5 and the component B prepared in the subsequent step S6 according to the weight ratio of 10: 1-2, stirring uniformly, defoaming, and vulcanizing and forming at 90-110 ℃ to obtain a finished product.
3. A tear resistant silicone rubber mold according to claim 1, wherein the catalyst is a vinyl Pt complex catalyst.
4. The tear-resistant silicone rubber mold according to claim 1, wherein: the alkynol reaction inhibitor is one of propargyl alcohol, propargyl alcohol or ethynyl methanol.
5. The method for preparing a tear-resistant silicone rubber mold according to claim 2, wherein the kneading in step S2 is performed by: kneading for 2-3 h at 80-120 ℃, and heating to 150-180 ℃ for heat treatment for 2-3 h.
6. The preparation method of the tear-resistant mold silicone rubber according to claim 2, wherein the pressure of the vacuum-pumping treatment in the step S3 is higher than-0.09 MPa, and the vacuum-pumping time is 2-3 h.
7. The method for preparing the tear-resistant mold silicone rubber according to claim 2, wherein the vulcanization molding time in step S7 is 25-30 min.
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| CN202111020883.9A CN113652092A (en) | 2021-09-01 | 2021-09-01 | Tear-resistant mold silicone rubber and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385169A (en) * | 2015-12-22 | 2016-03-09 | 汕头市科源有机硅材料有限公司 | Two-component high-tear-resistance liquid silicone rubber for mold production, and preparation method thereof |
| WO2016090574A1 (en) * | 2014-12-10 | 2016-06-16 | 深圳市森日有机硅材料有限公司 | Fully transparent liquid silicone rubber composition |
| CN110358306A (en) * | 2019-07-25 | 2019-10-22 | 浙江炬泰新材料科技有限公司 | A kind of cold shrinking power cable adjunct liquid silastic and preparation method thereof |
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- 2021-09-01 CN CN202111020883.9A patent/CN113652092A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016090574A1 (en) * | 2014-12-10 | 2016-06-16 | 深圳市森日有机硅材料有限公司 | Fully transparent liquid silicone rubber composition |
| CN105385169A (en) * | 2015-12-22 | 2016-03-09 | 汕头市科源有机硅材料有限公司 | Two-component high-tear-resistance liquid silicone rubber for mold production, and preparation method thereof |
| CN110358306A (en) * | 2019-07-25 | 2019-10-22 | 浙江炬泰新材料科技有限公司 | A kind of cold shrinking power cable adjunct liquid silastic and preparation method thereof |
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Application publication date: 20211116 |