CN105968819A - Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition - Google Patents
Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition Download PDFInfo
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- CN105968819A CN105968819A CN201610316631.3A CN201610316631A CN105968819A CN 105968819 A CN105968819 A CN 105968819A CN 201610316631 A CN201610316631 A CN 201610316631A CN 105968819 A CN105968819 A CN 105968819A
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a key liquid silicone rubber composition with ultralong striking life and a preparation method of the key liquid silicone rubber composition. The key liquid silicone rubber composition with the ultralong striking life is prepared from the following components in parts by mass: 101 to 130 parts of vinyl-terminated polymethylsiloxane, 0.5 to 10 parts of hydrogen polysiloxane, 11 to 30 parts of white carbon black, 5 to 15 parts of hexamethyldisilazane, 1 to 10 parts of MQ-type vinyl silicone resin, 50 to 1,000ppm of inhibitor and 0.5 to 20ppm of catalyst. The preparation method of the key liquid silicone rubber composition with the ultralong striking life comprises the steps of preparing base rubber, preparing rubber A, preparing rubber B, performing posttreatment and the like. The key liquid silicone rubber composition with the ultralong striking life and the preparation method of the key liquid silicone rubber composition, disclosed by the invention, have the characteristics of good mechanical property, excellent striking resisting life, high production efficiency and wide application range.
Description
Technical field
The present invention relates to add-on type liquid silicon rubber technical field, particularly relate to a kind of high life button liquid silastic group
Compound and preparation method thereof.
Background technology
The most ripe and perfect, by add-on type liquid silicon rubber along with Bi-component liquid silicone rubber injection molding technology
The advantages such as sulfuration speed DEG C is fast, and linear shrinkage ratio is little, and aftertreatment technology is simple, the production of silastic press key has been introduced into add-on type liquid
Body silicone rubber injection molding technology, and it is increasingly becoming one of its main application fields.
The skills such as add-on type button liquid silastic removes and requires hardness, hot strength, percentage elongation, tearing strength, linear shrinkage ratio
Outside art index, the anti-strike life-span is in use very important performance indications.The most common liquid button silicone rubber
Anti-strike the life-span at about 10,000,000 times, far from the use meeting high life button require (anti-strike the life-span reach 2000
Ten thousand times the most damaged).
The liquid silicon rubber composition that the present invention prepares, while giving necessary mechanical performance, with this liquid silicon rubber
Glue composition prepare silastic press key have superelevation anti-strike the life-span, hit the life-span reach 30,000,000 times the most damaged.This group
Compound can double-component injection molding, production efficiency is high, is suitable for large-scale production computer, remote controller, telephone set digital
Product button, computer keyboard list K etc., being particularly suited for notebook keyboard list K etc. has superelevation requirement to the strike life-span
Silastic product.
Summary of the invention
It is an object of the invention to provide a kind of button liquid silicon rubber composition with the superelevation strike life-span and preparation thereof
Method, has satisfactory mechanical property, excellence of anti-strike life-span, the high and broad-spectrum feature of production efficiency.
The present invention can be achieved through the following technical solutions:
The invention discloses a kind of button liquid silicon rubber composition with the superelevation strike life-span, including following mass parts
The component of number:
(A) ethenyl blocking polymethyl siloxane 101-130 part containing following average structure formula I,
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously,
At least there are in 1 molecule two or more vinyls；
(B) hydrogen containing siloxane 0-10 part containing following average structure formula II,
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously,
At least there is in 1 molecule two or more hydrogen-based；
(C) white carbon, 11-30 part；
(D) hexamethyldisiloxane, 5-15 part；
(E) Vinyl MQ silicon resin, 1-10 part；
(F) inhibitor, 50-1,000ppm (are calculated by the gross mass of compositions)；
(G) catalyst platinum complex, 0.5-20ppm (is calculated by the gross mass of compositions).
Further, the viscosity of described (A) component ethenyl blocking polymethyl siloxane is 1 under 25 DEG C of test conditions,
00-100,000mPa.s, the vinyl molar content of described (A) component ethenyl blocking polymethyl siloxane is 0.2%-5%.
In actual use, the viscosity of described (A) component ethenyl blocking polymethyl siloxane is preferably under 25 DEG C of test conditions 5,
00-60,000mPa.s, the vinyl molar content of described (A) component ethenyl blocking polymethyl siloxane is preferably 0.2%-
2%.
Further, the hydrogen content molar content of described (B) component hydrogen containing siloxane is 0.1%-1.5%.?
In actually used, the hydrogen content molar content of described (B) component hydrogen containing siloxane is preferably 0.3%-1.0%.
Further, described (C) component is vapor phase method or precipitated silica, preferably specific surface area 380m2The gas phase of/g
Method white carbon.
Further, described (D) component is selected from hexamethyldisiloxane, divinyl tetramethyl-disilazane, hexamethyl
Disiloxane, dimethyldiethoxysilane, dimethyldimethoxysil,ne, vinyltrimethoxy silane and vinyl three second
One or two or more kinds in TMOS.
Further, M/Q=0.1-1.0, preferably 0.2-0.8 in described (E) component Vinyl MQ silicon resin；Vinyl
Mass content 0.1-5%, preferably 0.5-1.0%.
Further, described (F) component selected from 3-methyl isophthalic acid-butine-3-alcohol, methylpentynol, 3,5-bis-
In methyl isophthalic acid-hexin-3-alcohol, 1-acetenyl-1-Hexalin and t etram-ethyltetravinylcyclotetrasiloxane one or both with
On, the consumption of described (F) component is preferably 100-500ppm.
Further, described (G) component is platinum-vinyl siloxane coordination compound, including use Willing method preparation and
Coordination compound prepared by Karstedt method, the consumption of described (G) component is preferably 3-20ppm.
Further, described (A) component is with a kind of ethenyl blocking polymethyl siloxane or two or more vinyl envelope
The mixture of end polymethyl siloxane.
A kind of have the preparation method that superelevation hits the button liquid silicon rubber composition in life-span, comprises the following steps:
The preparation of base glue: by (A) component ethenyl blocking polymethyl siloxane 100 parts, (A) component white carbon 11-30 part,
(D) component hexamethyldisiloxane 5-15 part is simultaneously introduced room temperature mixing 3h in kneader, is then rapidly heated to 170 DEG C of mixing
3h, cooling down obtains base glue；
The preparation of A glue: add (A) component ethenyl blocking polymethyl siloxane 1-30 part, (G) group in 100 parts of base glue
Dividing platinum complex 1-40ppm, mix homogeneously obtains A glue；
The preparation of B glue: add (A) component ethenyl blocking polymethyl siloxane 1-30 part, (B) group in 100 parts of base glue
Divide hydrogen containing siloxane 1-20 part, (E) component vinyl polysiloxane 2-20 part, (F) component inhibitor 200-1000ppm；Mixing
Uniformly obtain B glue；
Post processing: A glue and the evacuated deaeration of B glue, filter pressing obtains final products, then according to mass ratio 1:1 is carried out point
Dress.
The present invention is a kind of has superelevation button liquid silicon rubber composition hitting the life-span and preparation method thereof, has as follows
Beneficial effect:
The liquid silicon rubber composition that the present invention manufactures, while giving necessary mechanical performance, with this liquid silicon rubber
Glue composition prepare silastic press key have superelevation anti-strike the life-span, hit the life-span reach 30,000,000 times the most damaged.This group
Compound can double-component injection molding, production efficiency is high, is suitable for large-scale production computer, remote controller, telephone set digital
Product button, computer keyboard list K etc., being particularly suited for notebook keyboard list K etc. has superelevation requirement to the strike life-span
Silastic product.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with embodiment and to this
Invention product is described in further detail.
Embodiment 1
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 10,000mPa.s and vinyl molar content 0.4%
100 parts, model be (C) component gas phase method white carbon 40 parts of Degussa A380, (D) component hexamethyldisiloxane 12 parts, with
Time add room temperature mix homogeneously in kneader, be then warming up to 170 DEG C of mixing about 3h, cooling down obtains base glue.At 100 parts
Base glue adds viscosity 10,000mPa.s and (A) component ethenyl blocking methyl polysilicone of vinyl molar content 0.25%
1 part of alkane, (G) component platinum complex 24ppm, mix homogeneously obtains A glue；In 100 parts of base glue add viscosity 10,000mPa.s and
(A) component ethenyl blocking polymethyl siloxane 15 part, mole hydrogen content of vinyl molar content 0.25% is 1.0%
(B) (E) component vinyl polysiloxane 12 of component hydrogen containing siloxane 2 parts, M/Q=0.8 and vinyl mass content 0.5%
Part, (F) component inhibitor 600ppm, mix homogeneously obtains B glue, A glue and the evacuated deaeration of B glue, and filter pressing obtains final products,
Then according to mass ratio 1:1 carries out subpackage.
Embodiment 2
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 10,000mPa.s and vinyl molar content 0.4%
100 parts, (C) component model be the fume colloidal silica 40 parts of Degussa A380, (D) component hexamethyldisiloxane 12 parts, with
Time add room temperature mix homogeneously in kneader, then heat to 170 DEG C of mixing about 3h, cooling down obtains base glue.Then exist
Planetary mixer is uniformly divided into two parts, 100 parts of base glue adds viscosity 2,000mPa.s and vinyl molar content 0.6%
(A) component ethenyl blocking polymethyl siloxane 15 parts, (G) component platinum complex 24ppm, mix homogeneously obtains A glue；?
100 parts of base glue add viscosity 2,000mPa.s and (A) component ethenyl blocking poly-methyl silicon of vinyl molar content 0.6%
Oxygen alkane 1 part, mole hydrogen content is (B) component hydrogen containing siloxane 4 parts, M/Q=0.4 and the vinyl mass content of 0.6%
(E) component vinyl polysiloxane 6 parts of 0.8%, (F) component inhibitor 600ppm, mix homogeneously obtains B glue, A glue and B glue warp
Vacuumizing and defoaming, filter pressing obtains final products, then according to mass ratio 1:1 carries out subpackage.
Embodiment 3
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 100,000mPa.s and vinyl molar content 2%
100 parts, model be (C) component gas phase method or precipitated silica 10 parts, (D) hexamethyldisiloxane, the diethyl of Degussa A380
Thiazolinyl tetramethyl-disilazane 10 parts, is simultaneously introduced room temperature mix homogeneously in kneader, is then warming up to 170 DEG C of mixing 3h left
The right side, cooling down obtains base glue.Viscosity 10,00mPa.s and (A) group of vinyl molar content 5% is added in 100 parts of base glue
Ethenyl blocking polymethyl siloxane 1 part, (G) component is divided to use platinum-vinyl siloxane coordination compound prepared by Karstedt method
15ppm, mix homogeneously obtains A glue；Viscosity 10,00mPa.s and (A) of vinyl molar content 5% is added in 100 parts of base glue
Component ethenyl blocking polymethyl siloxane 30 part, mole hydrogen content is (B) component hydrogen containing siloxane 1.1 parts, the M/ of 1.0%
(E) component vinyl polysiloxane 5 parts of Q=0.1 and vinyl mass content 5%, (F) component inhibitor 3-methyl isophthalic acid-butine-
3-alcohol, methylpentynol 50ppm, mix homogeneously obtains B glue, A glue and the evacuated deaeration of B glue, and filter pressing obtains
Finished product, then according to mass ratio 1:1 carries out subpackage.
In the present embodiment, the ethenyl blocking polymethyl siloxane of described (A) component contains following average formula
(I):
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously,
At least there are in 1 molecule two or more vinyls；
Described (B) component hydrogen containing siloxane contains following average structure formula II:
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously,
At least there is in 1 molecule two or more hydrogen-based；Specific surface area 380m2The fume colloidal silica of/g.
Embodiment 4
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane 100 of viscosity 500mPa.s and vinyl molar content 0.2%
Part, model are (C) component gas phase method or precipitated silica 30 parts, (D) component hexamethyl disiloxane, the diformazan of Degussa A380
Base diethoxy silane, dimethyldimethoxysil,ne 15 parts, is simultaneously introduced room temperature mix homogeneously in kneader, is then warming up to
170 DEG C of mixing about 3h, cooling down obtains base glue.In 100 parts of base glue, add viscosity 6000mPa.s and vinyl mole contains
(A) component ethenyl blocking polymethyl siloxane 20 parts of amount 0.2%, (G) component use Willing legal system prepare standby platinum-
Vinyl siloxane complex 36ppm, mix homogeneously obtains A glue；Viscosity 6000, mPa.s and ethylene is added in 100 parts of base glue
(B) component that (A) component ethenyl blocking polymethyl siloxane 10 part, mole hydrogen content is 1.5% of base molar content 0.2%
(E) component vinyl polysiloxane 20 parts of hydrogen containing siloxane 2 parts, M/Q=0.2 and vinyl mass content 0.1%, (F) group
Point inhibitor 3,5-dimethyl-1-hexin-3-alcohol, 1-acetenyl-1-Hexalin 1000ppm, mix homogeneously obtains B glue, A glue and
The evacuated deaeration of B glue, filter pressing obtains final products, then according to mass ratio 1:1 carries out subpackage.
In the present embodiment, the ethenyl blocking polymethyl siloxane of described (A) component contains following average formula
(I):
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously,
At least there are in 1 molecule two or more vinyls；
Described (B) component hydrogen containing siloxane contains following average structure formula II:
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously,
At least there is in 1 molecule two or more hydrogen-based；Specific surface area 380m2The fume colloidal silica of/g.
Embodiment 5
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane 100 of viscosity 1,00mPa.s and vinyl molar content 5%
Part, model be (C) component gas phase method of Degussa A380 or precipitated silica 16 parts, (D) component dimethyldimethoxysil,ne,
Vinyltrimethoxy silane 5 parts, is simultaneously introduced room temperature mix homogeneously in kneader, is then warming up to 170 DEG C of mixing about 3h,
Cooling down obtains base glue.Viscosity 10,000, (A) component second of vinyl molar content 0.25% is added in 100 parts of base glue
Thiazolinyl end-blocking polymethyl siloxane 10 parts, (G) component use platinum-vinyl siloxane coordination compound prepared by Karstedt method
6ppm, mix homogeneously obtains A glue；Viscosity 100,000mPa.s and vinyl molar content 2% is added in 100 parts of base glue
(A) component ethenyl blocking polymethyl siloxane 20 part, mole hydrogen content be 0.1% (B) component hydrogen containing siloxane 2 parts,
(E) component vinyl polysiloxane 16 parts of M/Q=1.0 and vinyl mass content 0.5%, (F) component inhibitor tetramethyl four
Vinyl cyclotetrasiloxane 100ppm, mix homogeneously obtains B glue, A glue and the evacuated deaeration of B glue, and filter pressing obtains final products,
Then according to mass ratio 1:1 carries out subpackage.
In the present embodiment, the ethenyl blocking polymethyl siloxane of described (A) component contains following average formula
(I):
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously,
At least there are in 1 molecule two or more vinyls；
Described (B) component hydrogen containing siloxane contains following average structure formula II:
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously,
At least there is in 1 molecule two or more hydrogen-based；Specific surface area 380m2The fume colloidal silica of/g.
Embodiment 6
A kind of button liquid silicon rubber composition with the superelevation strike life-span, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane 100 of viscosity 500mPa.s and vinyl molar content 1.8%
Part, model are (C) component gas phase method or precipitated silica 14 parts, (D) component VTES of Degussa A380
12 parts, being simultaneously introduced room temperature mix homogeneously in kneader, be then warming up to 170 DEG C of mixing about 3h, cooling down obtains base glue.
Viscosity 10,000mPa.s and the poly-first of (A) component ethenyl blocking of vinyl molar content 0.25% is added in 100 parts of base glue
Radical siloxane 12 parts, (G) component use Willing method to prepare platinum-vinyl siloxane coordination compound 20ppm, and mix homogeneously obtains A
Glue；(A) the component ethenyl blocking adding viscosity 5,00mPa.s and vinyl molar content 0.18% in 100 parts of base glue gathers
Methylsiloxane 18 part, mole hydrogen content is (B) component hydrogen containing siloxane 8 parts, M/Q=0.6 and the vinyl quality of 0.9%
(E) component vinyl polysiloxane 14 parts of content 0.8%, (F) component inhibitor t etram-ethyltetravinylcyclotetrasiloxane
200ppm, mix homogeneously obtains B glue, A glue and the evacuated deaeration of B glue, and filter pressing obtains final products, then according to mass ratio 1:
1 carries out subpackage.
In the present embodiment, the ethenyl blocking polymethyl siloxane of described (A) component contains following average formula
(I):
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously,
At least there are in 1 molecule two or more vinyls；
Described (B) component hydrogen containing siloxane contains following average structure formula II:
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously,
At least there is in 1 molecule two or more hydrogen-based.
Performance for comparative illustration button of the present invention liquid silicon rubber composition.Make comparative example's simultaneously
Button liquid silicon rubber composition
Comparative example 1
A kind of button liquid silicon rubber composition, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 10,000mPa.s and vinyl molar content 0.4%
100 parts, (C) component model is while be the fume colloidal silica 40 parts of Degussa A380, (C) component hexamethyldisiloxane 12 parts
Adding room temperature mix homogeneously in kneader, be then warming up to 170 DEG C of mixing about 3h, cooling down obtains base glue.Then it is expert at
Star blender is uniformly divided into two parts, 100 parts of base glue adds viscosity 2,000mPa.s and vinyl molar content 0.6%
(A) component ethenyl blocking polymethyl siloxane 15 parts, (G) component platinum complex 24ppm, mix homogeneously obtains A glue；100
Part base glue adds viscosity 2,000mPa.s and (A) component ethenyl blocking methyl polysilicone of vinyl molar content 0.6%
Alkane 15 part, mole hydrogen content is (B) component hydrogen containing siloxane 4 parts, (F) component inhibitor 600ppm of 0.6%, mix homogeneously
Obtaining B glue, A glue and the evacuated deaeration of B glue, filter pressing obtains final products, then according to mass ratio 1:1 carries out subpackage.
Comparative example 2
A kind of button liquid silicon rubber composition, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 10,000mPa.s and vinyl molar content 0.4%
100 parts, the while that model being (C) component gas phase method white carbon 40 parts of Degussa A200, (D) component hexamethyldisiloxane 12 parts
Adding room temperature mix homogeneously in kneader, then heat to 170 DEG C of mixing about 3h, cooling down obtains base glue.Then it is expert at
Star blender is uniformly divided into two parts, 100 parts of base glue adds viscosity 10,000mPa.s and vinyl molar content 0.25%
(A) component ethenyl blocking polymethyl siloxane 5 parts, (G) component platinum complex 24ppm, mix homogeneously obtains A glue；100
Part base glue adds viscosity 10,000mPa.s and (A) component ethenyl blocking poly-methyl silicon of vinyl molar content 0.25%
Oxygen alkane 25 part, mole hydrogen content is (B) component hydrogen containing siloxane 2 parts, M/Q=0.4 and the vinyl mass content of 1.0%
(E) component vinyl polysiloxane 6 parts of 0.8, it is true through taking out that (G) component inhibitor 600ppm mix homogeneously obtains B glue, A glue and B glue
Empty deaeration, filter pressing obtains final products, then according to mass ratio 1:1 carries out subpackage.
Comparative example 3
A kind of button liquid silicon rubber composition, is prepared by the following method:
By (A) component ethenyl blocking polymethyl siloxane of viscosity 10,000mPa.s and vinyl molar content 0.4%
100 parts, model be Japan east (C) component gas phase method white carbon 40 parts of Cao LF, (D) component hexamethyldisiloxane 10 parts,
(D) component tetramethyl divinyl disilazane 2 parts is simultaneously introduced room temperature mix homogeneously in kneader, then heats to 170 DEG C
Mixing about 3h, cooling down obtains base glue.Then in planetary mixer, it is uniformly divided into two parts, adds in 100 parts of base glue
Viscosity 2,000, (A) component ethenyl blocking polymethyl siloxane 25 parts of vinyl molar content 0.6%, (G) component platinum network
Compound 24ppm, mix homogeneously obtains A glue；Viscosity 2,000mPa.s and vinyl molar content is added in 100 parts of base glue
The hydrogeneous poly-silica of (B) component that (A) component ethenyl blocking polymethyl siloxane 5 part, mole hydrogen content is 0.6% of 0.6%
(E) component vinyl polysiloxane 6 parts of 4 parts of alkane, M/Q=0.4 and vinyl mass content 0.8, (F) component inhibitor
300ppm, mix homogeneously obtains B glue, A glue and the evacuated deaeration of B glue, and filter pressing obtains final products, then according to mass ratio 1:
1 carries out subpackage
In order to verify the performance of button liquid silicon rubber composition of the present invention, by embodiment 1～7 and comparative example
The AB glue that 1～3 obtain solidifies according under the conditions of keeping 10min at 150 DEG C after 1:1 ratio mix homogeneously deaeration, and obtaining thickness is
2mm silicone rubber sheet material, 6mm hardness test block and silastic press key sheet.
Hot strength, percentage elongation and tearing strength and linear shrinkage ratio is measured with the sheet material of thickness 2mm derived above；6mm
Block of hardness test hardness and rebound value, concrete data are shown in Table 1:
Table 1 measuring mechanical property result
From the test result of table 1 it will be seen that button rubber composition of the present invention and comparative example are prepared into
To button rubber composition the most all have good mechanical performance.But, the button rubber composition of gained of the present invention
Mechanical performance concordance is preferable relative to comparative example, has a good application prospect.
In order to assess the strike life-span of the present invention further, according to following condition, embodiment 1～7 and contrast are implemented
The silastic press key sheet of example 1～3 gained uses following condition to test: loading 50g power；Stroke 10mm；Frequency 200 beats/min
Clock.Concrete data are as shown in table 2:
Table 2 hits life test result
From the test result of table 2 it will be seen that the strike life-span of the button rubber composition of gained of the present invention extremely has
Excellence, hits test through 30,000,000 times the most not damaged in time.
The above, only presently preferred embodiments of the present invention, not the present invention is made any pro forma restriction；All
The those of ordinary skill of the industry all can shown in by specification and the above and implement the present invention swimmingly；But, all familiar
Professional and technical personnel, in the range of without departing from technical solution of the present invention, may utilize disclosed above technology contents and makes
A little change, the equivalent variations modifying and develop, be the Equivalent embodiments of the present invention；Meanwhile, all realities according to the present invention
The change of any equivalent variations that above example is made by matter technology, modify and differentiation etc., all still fall within the technology of the present invention
Within the protection domain of scheme.
Claims (10)
1. a button liquid silicon rubber composition with the superelevation strike life-span, it is characterised in that include following mass fraction
Component:
(A) ethenyl blocking polymethyl siloxane 101-130 part containing following average structure formula I,
In average structure formula I, R1And R2For methyl or vinyl, m, n are more than 0 natural number, and m, n can not be 0 simultaneously, at 1
Molecule at least has two or more vinyls；
(B) hydrogen containing siloxane 0.5-10 part containing following average structure formula II
In average structure formula II, R3And R4For methyl or hydrogen-based, a, b are more than 0 natural number, and a, b can not be 0 simultaneously, 1
Individual molecule at least has two or more hydrogen-based；
(C) white carbon, 11-30 part；
(D) hexamethyldisiloxane, 5-15 part；
(E) Vinyl MQ silicon resin, 1-10 part；
(F) inhibitor, 50-1,000ppm (are calculated by the gross mass of compositions)；
(G) catalyst platinum complex, 0.5-20ppm (is calculated by the gross mass of compositions).
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 1, it is characterised in that: institute
The viscosity stating (A) component ethenyl blocking polymethyl siloxane is 1,00-100 under 25 DEG C of test conditions, 000mPa.s, institute
The vinyl molar content stating (A) component ethenyl blocking polymethyl siloxane is 0.2%-5%.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 1, it is characterised in that: institute
The hydrogen content molar content stating (B) component hydrogen containing siloxane is 0.1%-1.5%.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 2, it is characterised in that: institute
Stating (C) component is vapor phase method or precipitated silica.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 3, it is characterised in that: institute
State (D) component selected from hexamethyldisiloxane, divinyl tetramethyl-disilazane, hexamethyl disiloxane, dimethyl diethyl
One in TMOS, dimethyldimethoxysil,ne, vinyltrimethoxy silane and VTES or
More than two kinds.
6. hitting the button liquid silicon rubber composition in life-span according to the superelevation that has described in Claims 2 or 3, its feature exists
In: M/Q=0.1-1.0 in described (E) component Vinyl MQ silicon resin, vinyl mass content 0.1-5%.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 6, it is characterised in that: institute
State (F) component selected from 3-methyl isophthalic acid-butine-3-alcohol, methylpentynol, 3,5-dimethyl-1-hexin-3-alcohol, 1-
One or more in acetenyl-1-Hexalin and t etram-ethyltetravinylcyclotetrasiloxane.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 7, it is characterised in that: institute
Stating (G) component is platinum-vinyl siloxane coordination compound, including the cooperation using the preparation of Willing method and Karstedt method to prepare
Thing.
The button liquid silicon rubber composition with the superelevation strike life-span the most according to claim 8, it is characterised in that: institute
Stating (A) component is with a kind of ethenyl blocking polymethyl siloxane or the mixing of two or more ethenyl blocking polymethyl siloxane
Thing.
10. there is described in a claim 1～9 any one claim superelevation and hit the button liquid silastic combination in life-span
The preparation method of thing, it is characterised in that comprise the following steps:
The preparation of base glue: by (A) component ethenyl blocking polymethyl siloxane 100 parts, (A) component white carbon 11-30 part, (D)
Component hexamethyldisiloxane 5-15 part is simultaneously introduced room temperature mixing 3h in kneader, is then rapidly heated to 170 DEG C of mixing 3h,
Cooling down obtains base glue；
The preparation of A glue: add (A) component ethenyl blocking polymethyl siloxane 1-30 part, (G) component platinum in 100 parts of base glue
Complex 1-40ppm, mix homogeneously obtains A glue；
The preparation of B glue: add (A) component ethenyl blocking polymethyl siloxane 1-30 part in 100 parts of base glue, (B) component contains
Hydrogen polysiloxanes 1-20 part, (E) component vinyl polysiloxane 2-20 part, (F) component inhibitor 200-1000ppm；Mix homogeneously
Obtain B glue；
Post processing: A glue and the evacuated deaeration of B glue, filter pressing obtains final products, then according to mass ratio 1:1 carries out subpackage.
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