CN112011309A - Self-adhesive liquid silicone rubber for bonding PC and PA and preparation method thereof - Google Patents
Self-adhesive liquid silicone rubber for bonding PC and PA and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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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
Abstract
The invention provides self-adhesive liquid silicone rubber for bonding PC and PA, which comprises the following components in percentage by weight: (1-1.5) a component A and a component B mixed together; the component A comprises, by weight, 80-60 parts of base material, 40-20 parts of vinyl silicone oil and 2-0.1 part of catalyst; the component B comprises, by weight, 80-60 parts of a base material, 25-5 parts of vinyl silicone oil, 6-1 part of an adhesive, 11-2.0 parts of a cross-linking agent and 1-0.1 part of an inhibitor. The hardness range of the product is 20-70 HA, the self-adhesive liquid silicone rubber HAs good adhesion to PC, PA, PBT, PPSU, PEEK, TPU, PET and PI base materials, and the working time is prolonged without adding primer treatment or adhesives to the surfaces of the PC, PA, PBT, PPSU, PEEK, TPU, PET and PI base materials. The self-adhesive liquid silicone rubber is transparent and not turbid, has good compatibility among components, and does not need to additionally add additives containing complex functional groups such as alkoxy, epoxy and the like.
Description
Technical Field
The invention relates to the technical field of organic polymer preparation, in particular to self-adhesive liquid silicone rubber for bonding PC, PA, PBT, PPSU, PEEK, TPU, PET and PI and a preparation method thereof.
Background
Silicone rubber has excellent properties such as heat resistance, cold resistance, safety, electrical insulation, and weather resistance, and thus is widely used in various fields. The addition liquid silicone rubber has small molecular weight, low viscosity and convenient processing and forming, can save the working procedures of mixing, preforming, after finishing and the like, is easy to realize automation, can save energy and labor, has short production period and high efficiency, and is widely applied to a plurality of fields of electronics, machinery, cultural relics, artware, automobiles, aerospace and the like.
However, the addition type liquid silicone rubber itself has poor adhesion to various substrates, and when used as a potting material, a coating material, or an inlay material, it is usually necessary to subject the substrates to a primer treatment or to add a tackifier. With the diversity of materials and the increasing requirements for adhesion, the corresponding primers and self-adhesive liquid silicone rubber have been a hot spot for development in the field. However, the use of a primer has disadvantages of increased cost, reduced working efficiency, and solvent contamination, and the self-adhesive silicone rubber composition eliminates a priming or coating step, shortens the operation time, reduces the cost, and improves the working efficiency.
In the self-adhesive type liquid silicone rubber, there have been many reports on adhesion of the silicone rubber to an organic resin, glass, metal, or the like. For example, the prior art discloses a self-adhesive addition-crosslinking polysiloxane composition which is prepared by adding an organic silicon compound containing an epoxy group and a hydrolyzable group into liquid silicone rubber and has better adhesive force to PBT, nylon 6, PC, aluminum and steel.
Also, for example, chinese patent No. CN103589164B discloses an adhesive addition type liquid silicone rubber, which is added with a polyborosilazane tackifier and a modified silane coupling agent with epoxy groups, and has good adhesive properties to metals and non-metals. In these compositions, however, polyalkoxysiloxanes having functional groups such as epoxy, vinyl or acrylic groups are complex to synthesize, require additional steps and are disadvantageous economically and in work, or are mostly disadvantageous in that they have the disadvantages of poor compatibility, easily poisoning the platinum catalyst, deteriorating mechanical properties of the silica gel, lowering transparency, insufficient environmental protection grade, and the like.
Therefore, how to improve the formulation and performance of the self-adhesive liquid silicone rubber so as to make it environmentally friendly and have good adhesive property is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the self-adhesive liquid silicone rubber for bonding the PC, PA, PBT, PPSU, PEEK, TPU, PET and PI base materials, the silicone rubber has good adhesion to the PC, PA, PBT, PPSU, PEEK, TPU, PET and PI base materials, and the working time is not increased by adding primer treatment or adhesive to the surfaces of the PC, PA, PBT, PPSU, PEEK, TPU, PET and PI base materials. The self-adhesive liquid silicone rubber is transparent and not turbid, has good compatibility among components, and does not need to additionally add additives containing complex functional groups such as alkoxy, epoxy and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a self-adhesive liquid silicone rubber for bonding PC and PA comprises the following components in proportion of 1: 1-1.5 mixing the component A and the component B together;
the component A comprises, by weight, 60-80 parts of base material, 20-40 parts of vinyl silicone oil and 0.1-2 parts of catalyst.
The component B comprises, by weight, 60-80 parts of a base material, 5-25 parts of vinyl silicone oil, 1-6 parts of an adhesive, 2-11 parts of a cross-linking agent and 0.1-1 part of an inhibitor.
As a further description of the technical solution of the present invention, the adhesive includes a first adhesive and a second adhesive, the first adhesive is a phenylene group mechanism polymer, and the phenylene group mechanism polymer contains a benzene ring structure and at least three silicon-bonded hydrogen atoms;
the second adhesive is phenyl ring silicone oil with high hydrogen content on the side group, and the phenyl ring silicone oil with high hydrogen content on the side group contains a phenyl ring structure and at least two hydrogen atoms bonded with silicon.
The self-adhesive liquid silicone rubber is combined with a specific adhesive by adopting the cross-linking agent, so that the self-adhesive liquid silicone rubber can be effectively combined with the surfaces of substrates such as PC, PA and the like, and the silicone rubber has high transparency, is environment-friendly and is resistant to boiling.
As a further description of the technical solution of the present invention, the adding ratio of the first adhesive and the second adhesive is 3: (1-2), the optimal ratio is 3:1, and the total addition amount is not more than 6% of the whole formula.
As further described in the technical scheme of the invention, the phenylene mechanism polymer contains 0.5.0-2.0% of hydrogen by mass (preferably 1%) and 1.0-10.0% of benzene ring by mass. The technical scheme of the invention is further described that the high hydrogen-containing benzene ring silicone oil with side groups contains 0.5-2.0% (preferably 0.7%) of hydrogen, 0.5-10.0% (preferably 2%) of benzene ring, and 0.5-10.0% (preferably 2%) of epoxy functional group.
The main structure of the first adhesive is a linear siloxane structure, and the molecular weight of the first adhesive is 100-10000. The main structure of the second adhesive is a linear siloxane structure.
As further description of the technical scheme of the invention, the base material comprises 50-70 parts by weight of vinyl silicone oil and 30-50 parts by weight of fumed silica.
As a further description of the technical scheme of the invention, the vinyl silicone oil is at least one of terminal vinyl silicone oil with the viscosity of 500-100000 pcs or silicone oil with vinyl branched chain in the middle; the specific surface area of the fumed silica is more than or equal to 200m2Fumed silica/g.
The fumed silica is adopted as a reinforcing filler and matched with the vinyl silicone oil to form the base material, and the fumed silica with a proper proportion and a proper particle size can improve the dispersion efficiency of the base material in a silicone rubber system and also improve the physical and mechanical properties and the strength performance of the silicone rubber.
As a further description of the technical solution of the present invention, the cross-linking agent is at least one of a pendant hydrogen-containing silicone oil containing at least two silicon-bonded hydrogen atoms, or a hydrogen-containing silicone oil having hydrogen groups at both ends; the hydrogen-containing silicone oil contains 0.05-2% of hydrogen by mass.
The catalyst is Karstedt catalyst, and the purity of the catalyst is 1000-5000 ppm.
The inhibitor is one or more of alkynol and maleic acid derivative.
The inhibitor has the effect of inhibiting the cross-linking and curing of a silicone rubber system, the platinum catalyst has the effect of catalyzing and curing addition type silicone rubber, and the platinum catalyst and the addition type silicone rubber are matched in a proper proportion, so that reasonable operation process time can be reserved for a silicone rubber product in the using process, the improvement of process operation performance is facilitated, and the inhibitor has good use value and economic benefit.
As a further description of the technical scheme of the invention, in the component A and the component B, the molar ratio of Si-H functional groups to alkenyl functional groups (Si-H/alkenyl ratio for short) is (1.0-5.0): 1, preferably (1.0-2.0): 1.
the invention also provides a preparation method of the self-adhesive liquid silicone rubber, which comprises the following steps:
s1, preparing a component A: taking the base material, vinyl silicone oil and a catalyst, and fully mixing;
s2, preparing a component B: taking a base material, an adhesive, a cross-linking agent and an inhibitor, and fully mixing;
s3, mixing the prepared component A and the prepared component B according to the proportion of 1: (1-1.5) were thoroughly mixed to prepare Si-H/Si-Vi ═ (1.0-5.0): 1 self-adhesive liquid silicone rubber.
By the preparation method, the prepared self-adhesive liquid silicone rubber has the strength of 5-10MPa and the hardness of 20-70A. It has a 10% cure time of 10 seconds to 40 seconds and a 90% cure time of 35 seconds to 70 seconds when measured at 120 ℃ for 3 minutes.
The preparation method is used for mixing and preparing the components in a mixing mode, improves the traditional process, can be directly bonded with the plastic material, is in place at one time, and is fully automatic.
Based on the technical scheme, the invention has the following technical effects:
(1) the self-adhesive liquid silicone rubber provided by the invention adopts the first adhesive and the second adhesive in specific parts by weight, and when the self-adhesive liquid silicone rubber is matched with the cross-linking agent for use, after the silicone rubber is subjected to a vulcanization reaction, the benzene ring and the hydrogen group are utilized to form acting force with a large amount of reactive functional groups on the surfaces of base materials such as PC, PA and the like, so that the adhesive force of the self-adhesive liquid silicone rubber on the surfaces of PA, PC and the like is improved, the adhesive effect can be achieved without introducing organic polysiloxane or silane coupling agent with complex functional groups such as acrylate and the like, the compatibility of the components is not required to be.
(2) The self-adhesive liquid silicone rubber provided by the invention is transparent and compatible with a polysiloxane system, and besides the function of providing adhesion, the high-hydrogen-content is also beneficial to the formation of a silicone rubber crosslinking system, so that the self-adhesive addition liquid silicone rubber with good mechanical property and high transparency is obtained.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. The invention provides a preferred embodiment. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
A self-adhesive liquid silicone rubber for bonding PC and PA comprises a component A and a component B;
wherein the component A comprises 80 parts of base stock, 19.8 parts of 1000 mPa.s vinyl silicone oil and 0.2 part of 5000ppm platinum catalyst, and the components are fully mixed; the component B comprises 75 parts of base stock, 19.8 parts of 1000 mPas vinyl silicone oil, 1.13 parts of adhesive, 4 parts of cross-linking agent and 0.1 part of alkynol inhibitor, and the components are fully mixed.
Mixing the A component and the B component prepared in the following ratio of 1:1 proportion, and preparing the self-adhesive liquid silicone rubber with the total Si-H/Si-Vi ratio of 1.8. (Vi is an abbreviation for alkenyl).
Wherein the base material comprises 50 parts of vinyl silicone oil and 43.35 parts of fumed silica, the vinyl silicone oil is terminal vinyl silicone oil with the viscosity of 500-100000 cs, and the fumed silica is white carbon with the specific surface area of more than or equal to 200m2Fumed silica/g.
The mass fraction of the adhesive is 1.5%; the cross-linking agent adopts hydrogen-terminated silicone oil with the mass fraction of 0.16%.
The adhesive is prepared from a first adhesive and a second adhesive according to the proportion of 3:1, and mixing.
The first adhesive is a phenylene mechanism polymer containing a benzene ring structure and at least three silicon-bonded hydrogen atoms, wherein the mass fraction of hydrogen contained in the phenylene mechanism polymer is 1.0-2.0%, and the mass fraction of the benzene ring is 1.0-3.0%.
The second adhesive is side group high hydrogen-containing benzene ring silicone oil containing a benzene ring structure and at least two silicon-bonded hydrogen atoms, the weight fraction of hydrogen contained in the side group high hydrogen-containing benzene ring silicone oil is 1.0-2.0%, the weight fraction of benzene rings is 1.0-3.0%, and the weight fraction of epoxy functional groups is 1.0-3.0%.
The self-adhesive liquid silicone rubber of the embodiment adopts the combination of the cross-linking agent and the specific adhesive, so that the self-adhesive liquid silicone rubber can be strongly combined with the surfaces of PC and PA substrates, and the silicone rubber has high transparency, is environment-friendly and is resistant to boiling in water.
Example 2
A self-adhesive liquid silicone rubber for bonding PC and PA comprises a component A and a component B;
wherein the component A comprises 60 parts of base stock, 39 parts of vinyl silicone oil with the viscosity of 1000mPa & s and 1 part of platinum catalyst of 5000ppm, and the components are fully mixed; the component B comprises 68 parts of base stock, 25 parts of vinyl silicone oil with the viscosity of 1000 mPas, 1.5 parts of adhesive, 5 parts of cross-linking agent and 0.4 part of alkynol inhibitor, and the components are fully mixed.
Mixing the A component and the B component prepared in the following ratio of 1:1 ratio, and preparing the self-adhesive liquid silicone rubber with the total Si-H/Si-Vi ratio of 3.4.
Wherein the mass fraction of the adhesive is 1.6%, and the mass fraction of the cross-linking agent is 0.16% of hydrogen-terminated hydrogen-containing silicone oil.
The adhesive is prepared from a first adhesive and a second adhesive according to the proportion of 3:1, and mixing.
The first adhesive is a phenylene mechanism polymer containing a benzene ring structure and at least three silicon-bonded hydrogen atoms, wherein the mass fraction of hydrogen contained in the phenylene mechanism polymer is 1.0-2.0%, and the mass fraction of the benzene ring is 1.0-3.0%.
The second adhesive is side group high hydrogen-containing benzene ring silicone oil containing a benzene ring structure and at least two silicon-bonded hydrogen atoms, the weight fraction of hydrogen contained in the side group high hydrogen-containing benzene ring silicone oil is 1.0-2.0%, the weight fraction of benzene rings is 1.0-3.0%, and the weight fraction of epoxy functional groups is 1.0-3.0%.
Example 3
A self-adhesive liquid silicone rubber for bonding PC and PA comprises a component A and a component B;
wherein the component A comprises 70 parts of base stock, 28.5 parts of vinyl silicone oil with the viscosity of 1000mPa & s and 1.5 parts of 5000ppm platinum catalyst, and the components are fully mixed; component B comprises 72.71 parts of base stock, 18.9 parts of vinyl silicone oil with the viscosity of 1000 mPas, 1.28 parts of adhesive, 7 parts of cross-linking agent and 0.1 part of alkynol inhibitor, and the components are fully mixed.
Mixing the A component and the B component prepared in the following ratio of 1:1 proportion, and preparing the self-adhesive liquid silicone rubber with the overall Si-H/Si-Vi ratio of 2.8.
Wherein the mass fraction of the adhesive is 1.6%, and the mass fraction of the cross-linking agent is 0.17% of hydrogen-terminated hydrogen-containing silicone oil.
The adhesive is prepared from a first adhesive and a second adhesive in a ratio of 2.5: 1, and mixing.
The first adhesive is a phenylene mechanism polymer containing a benzene ring structure and at least three silicon-bonded hydrogen atoms, wherein the mass fraction of hydrogen contained in the phenylene mechanism polymer is 1.0-2.0%, and the mass fraction of the benzene ring is 1.0-3.0%.
The second adhesive is side group high hydrogen-containing benzene ring silicone oil containing a benzene ring structure and at least two silicon-bonded hydrogen atoms, the weight fraction of hydrogen contained in the side group high hydrogen-containing benzene ring silicone oil is 1.0-2.0%, the weight fraction of benzene rings is 1.0-3.0%, and the weight fraction of epoxy functional groups is 1.0-3.0%.
Example 4
A self-adhesive liquid silicone rubber for bonding PC and PA comprises a component A and a component B;
wherein the component A comprises 65 parts of base material, 34 parts of vinyl silicone oil with the viscosity of 1000mPa & s and 1 part of 5000ppm platinum catalyst, and the components are fully mixed; the component B comprises 60 parts of base stock, 28.2 parts of vinyl silicone oil with the viscosity of 1000 mPas, 1.45 parts of adhesive, 10 parts of cross-linking agent and 0.4 part of alkynol inhibitor, and the components are fully mixed.
Mixing the A component and the B component prepared in the following ratio of 1:1 proportion, and preparing the self-adhesive liquid silicone rubber with the total Si-H/Si-Vi ratio of 1.8.
Wherein the mass fraction of the adhesive is 1.74 percent, and the mass fraction of the cross-linking agent is 0.16 percent of hydrogen-terminated hydrogen-containing silicone oil.
The adhesive is prepared from a first adhesive and a second adhesive according to the following ratio of 2: 1, and mixing.
The first adhesive is a phenylene mechanism polymer containing a benzene ring structure and at least three silicon-bonded hydrogen atoms, wherein the mass fraction of hydrogen contained in the phenylene mechanism polymer is 1.0-2.0%, and the mass fraction of the benzene ring is 1.0-3.0%.
The second adhesive is side group high hydrogen-containing benzene ring silicone oil containing a benzene ring structure and at least two silicon-bonded hydrogen atoms, the weight fraction of hydrogen contained in the side group high hydrogen-containing benzene ring silicone oil is 1.0-2.0%, the weight fraction of benzene rings is 1.0-3.0%, and the weight fraction of epoxy functional groups is 1.0-3.0%.
Comparative example 1
A self-adhesive liquid silicone rubber comprises a component A and a component B;
wherein the component A comprises 80 parts of base stock, 19.8 parts of 1000 mPa.s vinyl silicone oil and 0.2 part of 5000ppm platinum catalyst, and the components are fully mixed;
component B comprises 75 parts of base stock, 20.9 parts of 1000 mPas vinyl silicone oil, 4 parts of cross-linking agent and 0.1 part of alkynol inhibitor, and the preparation method is also the same as that of example 1.
Comparative example 2
A self-adhesive liquid silicone rubber comprises a component A and a component B;
wherein the component A comprises 60 parts of base stock, 39 parts of vinyl silicone oil with the viscosity of 1000mPa & s and 1 part of platinum catalyst of 5000ppm, and the components are fully mixed;
component B comprises 68 parts of base stock, 26.6 parts of vinyl silicone oil with the viscosity of 1000 mPas, 5 parts of cross-linking agent and 0.4 part of alkynol inhibitor, and the preparation method is also the same as that of example 1.
Comparative example 3
A self-adhesive liquid silicone rubber comprises a component A and a component B;
components 70 parts of base stock, 28.5 parts of vinyl silicone oil with the viscosity of 1000 mPa.s and 1.5 parts of 5000ppm platinum catalyst, and fully mixing;
component B comprises 72.71 parts of base stock, 20.2 parts of vinyl silicone oil with the viscosity of 1000 mPas, 7 parts of cross-linking agent and 0.1 part of alkynol inhibitor, and the preparation method is also the same as that of example 1. The total Si-H/Si-Vi ratio is 1.7.
The self-adhesive liquid silicone rubber prepared in the examples 1 to 4 and the comparative examples 1 to 3 is cured at 150 ℃ for 3 to 5 minutes, and the tensile strength and the elongation at break are tested according to JIS K6251-2004, the hardness is tested according to JIS K6253-2006, and the tear strength is tested according to JIS K6252-2001; cleaning the surface of a PC substrate, coating the surface of the substrate with a vacuum defoamed A, B mixture with the thickness of 0.3-1 mm, drying at 110-130 ℃ for 5-10 min, cooling to room temperature, then scratching a cross on an adhesive layer, manually stripping the rubber layer from an integrally formed product, and evaluating the adhesiveness according to cohesive failure (rubber failure rate). The test results are shown in table 1.
TABLE 1 comparison of Properties of self-adhesive liquid Silicone rubbers of examples 1-4 and comparative examples 1-3
Symbol has the following meaning:
o: cohesive failure is more than or equal to 80 percent
And (delta): 30 percent to 80 percent of cohesive failure
X/Δ: 0% < cohesive failure < 30%
X: cohesive failure of 0% (peeling)
As is apparent from Table 1, the self-adhesive liquid silicone rubbers of examples 1 to 4 exhibited excellent performance in the performance indexes of hardness, tensile strength, elongation and tear strength, and the overall performance was stronger than that of the silicone rubbers of comparative examples 1 to 3.
The foregoing is illustrative and explanatory only, and is described in greater detail and detail, but is not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (10)
1. The self-adhesive liquid silicone rubber for bonding PC and PA is characterized by comprising a component A and a component B which are mixed together according to the ratio of 1: 1-1.5;
the component A comprises, by weight, 60-80 parts of base material, 20-40 parts of vinyl silicone oil and 0.1-2 parts of catalyst.
The component B comprises, by weight, 60-80 parts of a base material, 5-25 parts of vinyl silicone oil, 1-6 parts of an adhesive, 2-11 parts of a cross-linking agent and 0.1-1 part of an inhibitor.
2. The self-adhesive liquid silicone rubber according to claim 1, wherein the adhesive comprises a first adhesive and a second adhesive, the first adhesive being a phenylene group mechanism polymer containing a benzene ring structure and at least three silicon-bonded hydrogen atoms;
the second adhesive is phenyl ring silicone oil with high hydrogen content on the side group, and the phenyl ring silicone oil with high hydrogen content on the side group contains a phenyl ring structure and at least two hydrogen atoms bonded with silicon.
3. The self-adhesive liquid silicone rubber according to claim 2, wherein the first adhesive and the second adhesive are added in a ratio of 3: 1-2.
4. The self-adhesive liquid silicone rubber according to claim 2, wherein the phenylene group mechanism polymer has a hydrogen content of 0.5.0 to 2.0% by mass and a benzene ring content of 1.0 to 10.0% by mass.
5. The self-adhesive liquid silicone rubber according to claim 2, wherein the silicone oil with high hydrogen-containing benzene rings in the side groups comprises 0.5 to 2.0% by weight of hydrogen, 0.5 to 10.0% by weight of benzene rings and 0.5 to 10.0% by weight of epoxy functional groups.
6. The self-adhesive liquid silicone rubber according to claim 1, wherein the base material comprises 50-70 parts by weight of vinyl silicone oil and 30-50 parts by weight of fumed silica.
7. The self-adhesive liquid silicone rubber according to claim 1, wherein the vinyl silicone oil is at least one of terminal vinyl silicone oil or silicone oil with vinyl branched chain in the middle, the viscosity of the terminal vinyl silicone oil is 500-100000 cs; the specific surface area of the fumed silica is more than or equal to 200m2Fumed silica/g.
8. The self-adhesive liquid silicone rubber according to claim 1, wherein the crosslinking agent is at least one of a pendant hydrogen-containing silicone oil containing two or more silicon-bonded hydrogen atoms and a hydrogen-containing silicone oil having hydrogen groups at both ends; the catalyst is Karstedt's catalyst.
9. The self-adhesive liquid silicone rubber according to claim 1, wherein the molar ratio of Si-H functional groups to alkenyl functional groups in the a-component to the B-component is (1.0 to 5.0): 1.
10. the method for preparing a self-adhesive liquid silicone rubber according to any one of claims 1 to 9, characterized by comprising the steps of:
s1, preparing a component A: taking the base material, vinyl silicone oil and a catalyst, and fully mixing;
s2, preparing a component B: taking a base material, an adhesive, a cross-linking agent and an inhibitor, and fully mixing;
s3, mixing the prepared component A and the prepared component B according to the proportion of 1: (1-1.5) were thoroughly mixed to prepare Si-H/Si-Vi ═ (1-5.0): 1 self-adhesive liquid silicone rubber.
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