CN114621724B - Double-component organic silicon sealant and preparation method thereof - Google Patents
Double-component organic silicon sealant and preparation method thereof Download PDFInfo
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- 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
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Abstract
The invention belongs to the technical field of organic silicon materials, and in particular relates to a bi-component organic silicon sealant, which comprises the following components in percentage by mass: the component A and the component B of the composition 1 are prepared from the following raw materials: 50-100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 50-100 parts of nano calcium carbonate and 0-20 parts of plasticizer; the raw materials of the component B are as follows: 100 parts of component B base material, 0-8 parts of cross-linking agent, 0.5-5 parts of silane coupling agent and 0.1-1 part of catalyst; wherein the raw materials of the component B base material are as follows: 100 parts of modified end-capped polysiloxane, 30-80 parts of nano calcium carbonate, 0-20 parts of extender filler and 2-5 parts of water removal protective agent, wherein the modified end-capped polysiloxane is modified oximido polydimethylsiloxane. The bi-component organic silicon sealant has high storage stability and quick solidification.
Description
Technical Field
The invention belongs to the technical field of organic silicon materials, and particularly relates to a bi-component organic silicon sealant and a preparation method thereof.
Background
In the context of the state enforcing the "two carbon" policy, the photovoltaic energy industry is further rapidly evolving. The solar photovoltaic power generation system is a novel power generation system for directly converting solar radiation energy into electric energy, and the solar panel is also called a photovoltaic module and is one of core parts in the solar photovoltaic power generation system. The power generation life of the photovoltaic module is generally designed to be 25-30 years, and during this period, the photovoltaic module is subjected to severe climatic environments such as exposure to sunlight, wind blowing, rain, snow and the like, and is required to have excellent ultraviolet resistance and atmospheric aging resistance in order to meet such severe service conditions. Compared with other types of sealants, the single-component organosilicon sealant has excellent weather resistance and ultraviolet resistance, and is a currently mainstream sealant for solar photovoltaic modules in the market. The curing mechanism of the single-component organosilicon sealant is that moisture in the air is absorbed to cure from the surface to the inside, the curing speed is low, the average thickness of the single-component organosilicon sealant can only be cured for 3-4 mm in 24 hours, the requirements of quick, continuous and automatic production in the photovoltaic industry are difficult to meet, the curing room needs to be placed for curing for 2-3 hours after the construction of the sealant is finished, and the production efficiency is low.
The double-component organosilicon sealant has the characteristic of simultaneous internal and external curing, and is suitable for continuous production. Patent CN112646542A, CN104845377a discloses a bi-component sealant for a photovoltaic module, which solves the problem of rapid curing, but the mixing ratio of the bi-components needs to be controlled between 6:1 and 20:1, the requirement on the metering precision of mixing equipment is high when the bi-component sealant is used, and the phenomena of unstable performance, even non-curing, of the organosilicon sealant are easily caused when the mixing ratio fluctuates, so the application limitation is large.
Patents CN102703022A, CN106147695A and CN106701009a disclose a mixing ratio of 1:1, the base polymer of the double-component quick-curing organosilicon sealant contains polyalkoxy end-capped polydimethylsiloxane besides alpha, omega-dihydroxy polydimethylsiloxane, and the three components belong to dealcoholization systems, and have the technical defects that: the vulcanizing property gradually decreases along with the extension of the storage time, even the vulcanizing property cannot be vulcanized, the reliability is low, and the vulcanizing property is difficult to be suitable for the photovoltaic industry.
Therefore, the development of the double-component organic silicon sealant with low requirement on the metering precision of mixing equipment, quick curing and excellent storage stability has important significance.
Disclosure of Invention
The invention aims at providing a bi-component organic silicon sealant which has the advantages of excellent storage stability, quick solidification and low requirement on metering precision of mixing equipment, and is beneficial to realizing continuous industrial production.
The basic conception of the technical scheme adopted by the invention is as follows:
the double-component organic silicon sealant comprises the following components in percentage by mass: the component A and the component B of the composition 1 are prepared from the following raw materials: 50-100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 50-100 parts of nano calcium carbonate and 0-20 parts of plasticizer; the raw materials of the component B are as follows: 100 parts of component B base material, 0-8 parts of cross-linking agent, 0.5-5 parts of silane coupling agent and 0.1-1 part of catalyst; wherein the raw materials of the component B base material are as follows: 100 parts of modified end-capped polysiloxane, 30-80 parts of nano calcium carbonate, 0-20 parts of extender filler and 2-5 parts of water removal protective agent, wherein the modified end-capped polysiloxane is one or more of substances shown in formulas 1-3:
wherein n is an integer of 100 to 1500.
As one embodiment, the modified blocked polysiloxane has a kinematic viscosity at 25℃of 2 to 150 Pa.s.
As an aspect, the water removal protectant is phenyltributylketoxime silane.
As a scheme, the nano calcium carbonate is active nano calcium carbonate with the surface treated as follows: the treating agent is 2-2.5% stearic acid and 1-1.25% sodium dodecyl benzene sulfonate, and the calcium carbonate and the treating agent are mixed in a stirrer for 60-120min at 50-100 ℃ to obtain the active nano calcium carbonate with the particle size of 20-90nm.
Optionally, the extender is one of heavy calcium carbonate, silica micropowder and aluminum hydroxide.
As an aspect, the catalyst H is an organic tin carboxylate and its chelate, and optionally, is selected from one or more of dibutyl tin dilaurate, dibutyl tin diacetate, dioctyl tin dilaurate, dibutyl tin dilaurate, stannous octoate, tin bis Ding Yixian acetonate, and tin dibutyl acetoacetate.
As an alternative, the plasticizer is an inert polysiloxane, preferably a methyl-terminated polydimethylsiloxane, having a kinematic viscosity at 25℃of from 0.1 to 20 Pa.s.
As an aspect, the crosslinking agent includes one or more of methyltributyloxidoxysilane, vinyltributylketoximosilane, phenyltributylketoximosilane, and tetrabutylketoximosilane.
As one scheme, the silane coupling agent comprises one or more than two of gamma-aminopropyl trimethoxysilane, gamma-aminopropyl triethoxysilane, N-aminoethyl-gamma-aminopropyl trimethoxysilane, octyl trimethoxysilane, gamma-glycidoxypropyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
As a scheme, the raw materials of the component A are as follows: 80-100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 60-100 parts of nano calcium carbonate and 5-20 parts of plasticizer; the raw materials of the component B are as follows: 100 parts of component B base material, 3-6 parts of cross-linking agent, 2-5 parts of silane coupling agent and 0.2-0.5 part of catalyst; wherein the raw materials of the component B base material are as follows: 100 parts of modified end-capped polysiloxane, 60-80 parts of nano calcium carbonate, 10-20 parts of extender filler and 2-5 parts of water removal protective agent.
The invention provides application of a bi-component organic silicon sealant, which is used in the photovoltaic, electronic or automobile fields, wherein A, B components are mixed according to a mass ratio of 1:1 are mixed and used.
The invention also provides a preparation method of the bi-component organic silicon sealant, which comprises the following steps:
preparing a component A: adding alpha, omega-dihydroxyl polydimethylsiloxane, nano calcium carbonate and plasticizer into a stirrer with a heating system and a decompression system, heating to 120-130 ℃, stirring for 2-3 hours under the condition of vacuum degree of 0.085-0.099, and cooling to room temperature after dehydration;
preparing a component B: adding modified end-capped polysiloxane, a water removal protective agent, nano calcium carbonate and an incremental filler into a stirrer with a heating and decompression system, heating to 110-130 ℃, and stirring for 2-3 hours under the condition of 0.085-0.099 of vacuum degree to prepare a component B base material; cooling the base material of the component B to room temperature, adding a cross-linking agent, a coupling agent and a catalyst, and stirring for 30-60 min at normal temperature under reduced pressure to obtain the component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Compared with the prior art, the invention has the following technical advantages:
1. the bi-component organic silicon sealant provided by the invention is fast in solidification, and the mass or volume ratio of the bi-components is 1:1, the requirement on the metering precision of the mixing equipment is low.
2. The B component of the bi-component organosilicon sealant adopts modified oximido polydimethylsiloxane, and has better storage stability and shelf life reaching 12 months compared with the dealcoholization system (for example, comparative example 1) adopted in the prior art.
3. Compared with polyalkoxy end-capped polydimethylsiloxane in the prior art, the bi-component organosilicon sealant has higher reactivity and higher deep curing rate, is basically cured within 2 hours after mixed sizing, and meets the requirement of continuous production of photovoltaic modules.
4. The B-component base material of the bi-component organosilicon sealant adopts phenyl tributyl ketoxime silane as a dehydration protective agent, and forms protection for the modified oximido polydimethylsiloxane in the dehydration process, and meanwhile, the problems of unstable storage of sizing materials caused by methanol generated by hydrolysis of the conventional dehydration protective agent (for example, vinyl trimethoxy silane) are avoided.
5. The preparation method of the bi-component organic silicon sealant has simple process, is beneficial to operation and has high production efficiency.
6. The bi-component organic silicon sealant disclosed by the invention is high in reliability, is especially suitable for the photovoltaic field, and is beneficial to realizing continuous production of photovoltaic modules.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention are clearly and completely described below. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
In the following examples, "parts" are parts by weight, and represent a relationship of the proportions of materials to be fed, and when a uniform unit of measurement, such as g or kg, is used in the same case.
Unless otherwise specified, the chemical reagents or raw materials employed in the examples of the present invention are commercially available.
As a specific example, the nano calcium carbonate used in examples 1 to 5 below has a particle size of 20 to 90nm.
As one case, the density of the A and B components of the present invention is near 1:1, the density ratio is 0.9 to 1.1, for example, 0.9, 0.92, 0.95, 0.97, 1, 1.02, 1.05, 1.08, 1.1.
The modified end-capped polysiloxanes used in the examples below were one or more of the materials represented by formulas 1-3:
wherein n is an integer of 100 to 1500.
The modified end-capped polysiloxanes of formulas 1-3 above can be prepared by the following method:
100 parts of alpha, omega-dihydroxypolydimethylsiloxane and 1-3 parts of methyltributyloximony silane (the product corresponds to formula 1) or tetrabutylketoxime silane (the product corresponds to formula 2) or vinyl tributylketoxime silane (the product corresponds to formula 3) are respectively stirred and reacted for 1-2 hours at the temperature of 20-50 ℃ and the vacuum degree of 0.085-0.099.
Example 1
And (3) preparing a component A:
adding 100 parts of 20 Pa.s alpha, omega-dihydroxyl polydimethylsiloxane, 100 parts of nano calcium carbonate and 5 parts of 0.35 Pa.s methyl end-capped polydimethylsiloxane into a stirrer with a heating and decompression system, heating to 120 ℃ and stirring for 3 hours under the condition of vacuum degree of 0.085-0.099, and cooling to room temperature after dehydration to obtain a component A;
and (2) preparing a component B:
100 parts of 20 Pa.s modified end-capped polysiloxane has the following structure, wherein n has the value of 1000:
adding 80 parts of nano calcium carbonate, 20 parts of heavy calcium carbonate and 2 parts of phenyl tributyl ketoxime silane into a stirrer with a heating and decompression system, heating to 120 ℃, and stirring for 3 hours under the condition of 0.085-0.099 of vacuum degree to prepare a component B base material;
cooling the base material of the component B to room temperature, adding 5 parts of methyltributylketone oxime silane, 2 parts of gamma-aminopropyl triethoxysilane, 1 part of gamma-glycidoxypropyl trimethoxysilane and 0.2 part of dibutyl tin dilaurate, and stirring for 60 minutes under the condition of normal temperature and vacuum degree of 0.085-0.099 to prepare the component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Example 2
Preparation of A component
100 parts of 20 Pa.s alpha, omega-dihydroxyl polydimethylsiloxane, 100 parts of nano calcium carbonate and 5 parts of 0.35 Pa.s methyl end-capped polydimethylsiloxane are added into a stirrer with a heating and decompression system, the temperature is raised to 120 ℃ and the mixture is stirred for 3 hours under the condition of 0.085-0.099 of vacuum degree, and the mixture is cooled to room temperature after dehydration, so that a component A is obtained;
and (2) preparing a component B:
100 parts of 20 Pa.s modified end-capped polysiloxane is taken, and the structure is as follows, wherein n has the value of 1000:
adding 80 parts of nano calcium carbonate, 20 parts of silica micropowder and 3 parts of phenyltributyl ketoxime silane into a stirrer with a heating and decompression system, heating to 120 ℃, and stirring for 3 hours under the condition of 0.085-0.099 of vacuum degree to prepare a component B base material;
cooling the base material of the component B to room temperature, adding 5 parts of methyltributylketone oxime-based silane, 2 parts of gamma-aminopropyl trimethoxysilane, 1 part of gamma-glycidoxypropyl trimethoxysilane and 0.2 part of dioctyl tin dilaurate, and stirring for 60min under the condition of normal temperature vacuum degree of 0.085-0.099 to prepare the component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Example 3
And (3) preparing a component A:
adding 100 parts of 20 Pa.s alpha, omega-dihydroxyl polydimethylsiloxane, 100 parts of nano calcium carbonate and 5 parts of 0.35 Pa.s methyl end-capped polydimethylsiloxane into a stirrer with a heating and decompression system, heating to 120 ℃ and decompressing and stirring for 3 hours, and cooling to room temperature after dehydration to obtain a component A;
and (2) preparing a component B:
100 parts of 20 Pa.s modified end-capped polysiloxane is structured as follows, wherein n takes the value of 1000:
adding 80 parts of nano calcium carbonate, 20 parts of aluminum hydroxide and 5 parts of phenyl tributyl ketoxime silane into a stirrer with a heating and decompression system, heating to 120 ℃ and stirring for 3 hours under reduced pressure to obtain a component B base material, cooling the base material to room temperature, adding 5 parts of methyl tributyl ketoxime silane, 2 parts of N-aminoethyl-gamma-aminopropyl trimethoxysilane octyl trimethoxysilane, 1 part of gamma-methacryloxypropyl trimethoxysilane and 0.2 part of dibutyl acetoacetic acid ethyl tin, and stirring for 60 minutes under the condition of normal temperature vacuum degree of 0.085-0.099 to obtain a component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Example 4
And (3) preparing a component A:
adding 100 parts of 20 Pa.s alpha, omega-dihydroxyl polydimethylsiloxane, 70 parts of nano calcium carbonate and 20 parts of 1.0 Pa.s methyl end-capped polydimethylsiloxane into a stirrer with a heating and decompression system, heating to 120 ℃ and stirring for 3 hours under the condition of vacuum degree of 0.085-0.099, and cooling to room temperature after dehydration to obtain a component A;
and (2) preparing a component B:
100 parts of 80 Pa.s modified end-capped polysiloxane is structured as follows, wherein n takes the value of 1500:
60 parts of nano calcium carbonate, 10 parts of heavy calcium carbonate and 4 parts of phenyl tributyl ketoxime silane are added into a stirrer with a heating and decompression system, the temperature is raised to 120 ℃, and the mixture is stirred for 3 hours under the condition of 0.085-0.099 of vacuum degree, so that a component B base material is prepared;
cooling the base material of the component B to room temperature, adding 3-methyl tributylketoxime group silane, 2 parts of vinyl tributylketoxime group silane, 1 part of gamma-aminopropyl triethoxy silane, 1 part of gamma-glycidoxypropyl trimethoxy silane and 0.5 part of dibutyl tin dilaurate, and stirring for 60 minutes under the condition of normal temperature vacuum degree of 0.085-0.099 to prepare the component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Example 5
And (3) preparing a component A:
adding 100 parts of 20 Pa.s alpha, omega-dihydroxyl polydimethylsiloxane, 70 parts of nano calcium carbonate and 20 parts of 1.0 Pa.s methyl end-capped polydimethylsiloxane into a stirrer with a heating and decompression system, heating to 120 ℃ and stirring for 3 hours under the condition of vacuum degree of 0.085-0.099, and cooling to room temperature after dehydration to obtain a component A;
and (2) preparing a component B:
100 parts of 80 Pa.s modified end-capped polysiloxane is structured as follows, wherein n takes the value of 1500:
60 parts of nano calcium carbonate, 10 parts of heavy calcium carbonate and 4-phenyl tributyl ketoxime silane are added into a stirrer with a heating and decompression system, the temperature is raised to 120 ℃, and the mixture is stirred for 3 hours under the condition of 0.085-0.099 of vacuum degree, so that a component B base material is prepared;
cooling the base material of the component B to room temperature, adding 3-methyl tributylketoxime silane, 2 parts of phenyl tributylketoxime silane, 1 part of gamma-aminopropyl trimethoxysilane, 1 part of gamma-glycidoxypropyl trimethoxysilane and 0.5 part of dioctyl tin dilaurate, and stirring for 60min under the condition of normal temperature vacuum degree of 0.085-0.099 to obtain a component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
Example 6
The difference from example 1 is that the nano calcium carbonate is activated calcium carbonate with the surface treated by stearic acid, and the specific method is as follows: the treating agent is 2% of stearic acid and 1% of sodium dodecyl benzene sulfonate by mass of nano calcium carbonate, and the treating process is that the calcium carbonate and the treating agent are mixed in a stirrer for 100min at 90 ℃ to obtain the active nano calcium carbonate with the particle size of 20-90nm.
Comparative example 1
The only difference from example 1 is that the modified end-blocked polysiloxane of component B is replaced by an alkoxy-blocked polysiloxane of the structure wherein n has the value 1000:
meanwhile, the cross-linking agent methyltributylketonoxime silane was changed to methyltrimethoxysilane, and the other was the same as in example 1.
Comparative example 2
The only difference from example 1 is that the water-scavenging protective agent phenyltributylketoxime silane in the base-stock of component B is replaced by vinyltrimethoxysilane, the others remaining the same as in example 1.
Comparative example 3
The only difference from example 1 is the removal of the phenyltributylketoxime silane from the B-component base.
After cooling the base to room temperature, it was found that the viscosity of the base had become significantly thicker and there was signs of crosslinking, and the B-component formulation could not be continued, since no water-removal protectant was added during the base dehydration.
Test examples
The silicone sealants of examples 1 to 6 and comparative examples 1 to 3 of the present invention were subjected to performance test under the same conditions, and the specific method was as follows:
1) Testing the surface drying time and the deep curing rate of the obtained organosilicon sealant according to the national standard GB/T13477-2002;
2) The hardness of the obtained organosilicon sealant is tested according to the national standard GB/T531.1-2008;
3) Testing the tensile strength and the elongation at break of the obtained organosilicon sealant according to the national standard GB/T528-2009;
4) The prepared silicone sealant was stored in a rubber tube at room temperature for 1 year, and the condition during storage was monitored.
The test results are specifically shown in table 1.
TABLE 1
As can be seen from the performance data of comparative examples 1 and 1, the modified oxime-based polydimethylsiloxane is used as the base polymer for the component B, the silicone sealant has small difference in performance change before and after one year of storage at room temperature and is more stable in storage, and the alkoxy-terminated polysiloxane is adopted in comparative example 1, so that the alkoxy-terminated polysiloxane is a scheme commonly adopted in the market at present, and has great difference in performance before and after the storage stability and poor storage stability.
As can be seen from the performance data of comparative examples 1 and 2, phenyl tributyl ketoxime silane is adopted as a water removal protective agent in the process of removing the base material of the component B, modified oximido polydimethylsiloxane is protected in the dehydration process, the product has small performance change difference before and after one year of storage at room temperature and is more stable in storage, and vinyl trimethoxy silane is adopted in comparative example 2, so that methanol is easily generated by hydrolysis, the storage of sizing materials is unstable and the storage stability is poor.
As can be seen from comparative examples 1 and 3, if a water removal protective agent, such as phenyltributyl ketoxime silane or vinyltrimethoxysilane, is not used in the process of removing the base material of the component B, the base material is easily self-crosslinked in the process of heating and dehydrating due to high activity of the modified oximido polydimethylsiloxane, so that the preparation of the component B cannot be continued, and a two-component organosilicon sealant product cannot be obtained.
Compared with example 1, the active nano calcium carbonate subjected to optimization treatment has relatively better mechanical properties.
Claims (12)
1. The double-component organic silicon sealant comprises the following components in percentage by mass: the component A and the component B of the composition 1 are prepared from the following raw materials: 50-100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 50-100 parts of nano calcium carbonate and 0-20 parts of plasticizer; the raw materials of the component B are as follows: 100 parts of component B base material, 3-8 parts of cross-linking agent, 0.5-5 parts of silane coupling agent and 0.1-1 part of catalyst; wherein the raw materials of the component B base material are as follows: 100 parts of modified end-capped polysiloxane, 30-80 parts of nano calcium carbonate, 0-20 parts of extender filler and 2-5 parts of water removal protective agent, wherein the modified end-capped polysiloxane is one or more of substances shown in formulas 1-3:
wherein n is an integer of 100 to 1500;
the water removal protective agent is phenyl tributyl ketoxime silane;
the component B base material is obtained by adding modified end-capped polysiloxane, a water removal protective agent, nano calcium carbonate and an incremental filler into a stirrer with a heating and decompression system, heating to 110-130 ℃ and stirring for 2-3 hours under the condition of vacuum degree of 0.085-0.099;
the cross-linking agent comprises one or more than two of methyl tributyl ketoxime silane, vinyl tributyl ketoxime silane, phenyl tributyl ketoxime silane and tetrabutyl ketoxime silane.
2. The two-component silicone sealant according to claim 1, wherein the nano calcium carbonate is an active nano calcium carbonate having a surface treated as follows: the treating agent is stearic acid with the mass of 2-2.5% of nano calcium carbonate and sodium dodecyl benzene sulfonate with the mass of 1-1.25%, the nano calcium carbonate and the treating agent are mixed in a stirrer for 60-120min at 50-100 ℃ to finally obtain the active nano calcium carbonate with the particle size of 20-90nm.
3. The two-part silicone sealant according to claim 1, wherein the modified end-capped polysiloxane has a dynamic viscosity of 2 to 150 Pa-s at 25 ℃.
4. The two-component silicone sealant of claim 1, wherein the extender filler is one of heavy calcium carbonate, silica fume, and aluminum hydroxide.
5. The two-part silicone sealant according to claim 1, wherein the catalyst is a tin organic carboxylate and its chelates.
6. The two-part silicone sealant according to claim 1, wherein the catalyst is selected from one or more of dibutyl tin dilaurate, dibutyl tin diacetate, dioctyl tin dilaurate, dibutyl tin dilaurate, stannous octoate, tin bis Ding Yixian acetonate, and tin dibutyl acetoacetate.
7. The two-part silicone sealant according to claim 1, wherein the plasticizer is an inert polysiloxane.
8. The two-component silicone sealant according to claim 1, wherein the plasticizer is methyl-terminated polydimethylsiloxane having a dynamic viscosity of 0.1 to 20 Pa-s at 25 ℃.
9. The two-component silicone sealant according to claim 1, wherein the silane coupling agent comprises one or more of γ -aminopropyl trimethoxysilane, γ -aminopropyl triethoxysilane, N-aminoethyl- γ -aminopropyl trimethoxysilane, octyl trimethoxysilane, γ -glycidoxypropyl trimethoxysilane, γ -methacryloxypropyl trimethoxysilane.
10. The two-component silicone sealant according to claim 1, wherein the raw materials of the a component are: 80-100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 60-100 parts of nano calcium carbonate and 5-20 parts of plasticizer; the raw materials of the component B are as follows: 100 parts of component B base material, 3-6 parts of cross-linking agent, 2-5 parts of silane coupling agent and 0.2-0.5 part of catalyst; wherein the raw materials of the component B base material are as follows: 100 parts of modified end-capped polysiloxane, 60-80 parts of nano calcium carbonate, 10-20 parts of extender filler and 2-5 parts of water removal protective agent.
11. Use of a two-component silicone sealant according to any of claims 1-10, wherein the two-component silicone sealant is used in the photovoltaic, electronic or automotive field, wherein A, B components are combined according to a mass ratio of 1:1 are mixed and used.
12. The method for preparing the two-component silicone sealant according to any one of claims 1 to 10, comprising the steps of:
preparing a component A: adding alpha, omega-dihydroxyl polydimethylsiloxane, nano calcium carbonate and plasticizer into a stirrer with a heating system and a decompression system, heating to 120-130 ℃, stirring for 2-3 hours under the condition of vacuum degree of 0.085-0.099, and cooling to room temperature after dehydration;
preparing a component B: adding modified end-capped polysiloxane, a water removal protective agent, nano calcium carbonate and an incremental filler into a stirrer with a heating and decompression system, heating to 110-130 ℃, and stirring for 2-3 hours under the condition of 0.085-0.099 of vacuum degree to prepare a component B base material; cooling the base material of the component B to room temperature, adding a cross-linking agent, a coupling agent and a catalyst, and stirring for 30-60 min at normal temperature under reduced pressure to obtain the component B;
the component A and the component B are mixed according to the mass ratio of 1:1, mixing to obtain the double-component organic silicon sealant.
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