CN112608714A - Industrial heat-resistant silane modified polyether sealant and preparation method thereof - Google Patents
Industrial heat-resistant silane modified polyether sealant 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
- C09J183/10—Block or graft copolymers containing polysiloxane sequences
- C09J183/12—Block or graft copolymers containing polysiloxane sequences containing polyether sequences
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/42—Block-or graft-polymers containing polysiloxane sequences
- C08G77/46—Block-or graft-polymers containing polysiloxane sequences containing polyether sequences
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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
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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Abstract
The application discloses an industrial heat-resistant silane modified polyether sealant in the technical field of adhesives, which is prepared from the following raw materials in parts by weight: 80-100 parts of silane modified polyether, 50-80 parts of plasticizer, 160-200 parts of filler, 0.1-10 parts of thixotropic agent, 1-2 parts of ultraviolet absorber, 1-2 parts of light stabilizer, 4-7 parts of water removing agent, 3-6 parts of coupling agent and 1-2 parts of catalyst. The silane modified polyether sealant prepared by adopting the formula and the method can be widely applied to the industrial fields of rail transit, automobile manufacturing, containers and the like.
Description
Technical Field
The invention belongs to the technical field of adhesives, and particularly relates to an industrial heat-resistant silane modified polyether sealant and a preparation method thereof.
Background
The three most common sealants in the market at present are: polythios, silicones and polyurethanes, and polythios are increasingly being phased out due to the slow curing at low temperatures and poor durability. The terminal NCO group of the polyurethane sealant is sensitive to moisture, has poor storage stability, is easy to generate air holes during curing and has low curing speed; the silicone sealant has no paintability, and the glue layer is easy to separate out. The silane modified polyether sealant, also called MS (polyurethane) sealant, has the advantages of both polyurethane type and silicone type sealants, shows excellent adhesion and paintability and good environmental friendliness; no solvent and is very friendly to human body, thus having wide market prospect in recent years.
However, the main chain of the silane modified polyether is polyether, and the carbon-carbon bond and the carbon-oxygen bond in the structure of the silane modified polyether are not as good as the silicon-oxygen bond, so that the use field of the silane modified polyether sealant is limited due to poor heat resistance. Chinese patent CN101906246B discloses a single-component heat-resistant silane modified sealant, which improves heat resistance by introducing phenyl to a silane modified polyether main chain by using phenyltrimethoxysilane and adding a heat stabilizer and an anti-aging agent, but the introduction of the phenyltrimethoxysilane can cause the silane modified polyether to become brittle as a whole and the elastic property to be reduced, so that the defect can be slightly improved by compounding with a proper amount of titanium dioxide or titanium oxide, but the performance requirement for buildings cannot be fundamentally met.
Based on this, chinese patent CN109207109A discloses "a heat-resistant silane modified polyether sealant", which improves the heat resistance of the sealant by introducing derivatives of calix [8] arene, but the segment structures of the derivatives of the phenyl or calix [8] arene introduced in the two patents are essentially mainly carbon-carbon bonds with lower bond energy, and the carbon-carbon bonds are broken under high temperature conditions, resulting in the performance degradation of the sealant, and the problem of poor heat resistance of the silane modified polyether sealant cannot be fundamentally solved. Therefore, the development of an industrial environment-friendly silane modified polyether sealant which has good heat resistance and good mechanical property and can be coated is urgently needed in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an industrial heat-resistant silane modified polyether sealant, which solves the problem of poor heat resistance of the silane modified polyether sealant in terms of molecular structure.
One of the purposes of the invention is to provide an industrial heat-resistant silane modified polyether sealant, which comprises silane modified polyether as raw materials, wherein the structural formula of the silane modified polyether is as follows:
wherein n and m are the number of repeating units, the value of n is 3-300, and the value of m is 20-500; r is methyl or ethyl, R' is methyl, methoxy or ethoxy; the molecular weight of the silane modified polyether is 8000-25000, and the viscosity is 10000-50000 mPa.s.
According to the invention, from the viewpoint of further improving the heat resistance and paintability of the sealant, preferably, the long-chain structures at two ends of the silane modified polyether are macromolecular polyethers, the ratio of n to m is 1:1, and the end group of the silane modified polyether is trimethoxy.
Specifically, the raw materials of the industrial heat-resistant silane modified polyether sealant comprise the following components in parts by weight:
80-100 parts of silane modified polyether;
50-80 parts of a plasticizer;
160-200 parts of a filler;
0.1-10 parts of thixotropic agent;
1-2 parts of an ultraviolet absorber;
1-2 parts of a light stabilizer;
4-7 parts of a water removing agent;
3-6 parts of a coupling agent;
1-2 parts of a catalyst.
Further, the plasticizer is at least one of polypropylene glycol or phthalate. Preferably, the plasticizer is polypropylene glycol which is not easy to precipitate and has good compatibility with the polymer.
Further, the filler is at least one of nano calcium carbonate, heavy calcium carbonate, kaolin or silicon micropowder; the thixotropic agent is at least one of polyamide wax or fumed silica. Preferably, in order to ensure the workability and the mechanical property, the filler is the combination of nano calcium carbonate and heavy calcium carbonate according to the ratio of 2: 1.
Further, the ultraviolet absorbent is at least one of salicylate ultraviolet absorbent, benzophenone ultraviolet absorbent or benzotriazole ultraviolet absorbent; the light stabilizer is at least one of hindered amine light stabilizers.
Further, the water removing agent is at least one of oligomer vinyltrimethoxysilane, vinyltrimethoxysilane or vinyltriethoxysilane. Preferably, the water removing agent is oligomer vinyl trimethoxy silane with better environmental protection property.
Further, the coupling agent is at least one of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-aminopropyltrimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and gamma-aminopropyltriethoxysilane.
Further, the catalyst is at least one of dibutyltin dilaurate, stannous octoate and tin chelate. Preferably, when the silane modified polyether terminal group is trimethoxy, the catalyst is dibutyltin dilaurate.
According to the present invention, it is preferable that the composition further contains a pigment in an amount of 0 to 5 parts by weight relative to 100 parts by weight of the silane-modified polyether resin.
The invention also aims to provide a preparation method of the industrial heat-resistant silane modified polyether sealant, which comprises the following steps:
step A: weighing raw materials in proportion, mixing the silane modified polyether, the plasticizer, the filler and the thixotropic agent, and stirring at a low speed for 20min to be uniform;
and B: b, stirring the stirred substance in the step A at a high speed for 2 hours under the conditions that the vacuum degree is-0.085 MPa to 0.1MPa and the temperature is 100 ℃ to 120 ℃ to obtain a mixed material I;
and C: cooling the mixed material I to below 40 ℃, adding a water removing agent, and stirring at a high speed for 10min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa to obtain a mixed material II;
step D: adding an ultraviolet absorbent, a light stabilizer and a coupling agent into the mixed material II, and stirring at a high speed for 10min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa to obtain a mixed material III;
step E: adding a catalyst into the mixed material III, stirring at a high speed for 20min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa, and discharging to obtain the silane modified polyether sealant.
The second object of the present invention is to provide a silane-modified polyether having the following structural formula:
wherein n and m are the number of repeating units, the value of n is 3-300, and the value of m is 20-500; r is methyl or ethyl, R' is methyl, methoxy or ethoxy; the average molecular weight of the silane modified polyether is 8000-25000, and the viscosity is 10000-50000 mPa.s.
The silane modified polyether is subjected to hydrosilylation reaction with hydrogen-containing silicone oil, and silane coupling agent is used for silane end capping to obtain the silane modified polyether with the above 3 structures.
Compared with the prior art, the invention has the following beneficial effects:
the silane modified polyether structure of the invention is characterized in that a polydimethylsiloxane chain segment is introduced into a traditional silane modified polyether chain segment, the Si-O chain segment proportion in a polymer is increased and the specific gravity of the polymer is controlled, so that the silane modified polyether is obtained, the heat resistance and the durability of the sealant are greatly improved, the sealant is prevented from being pulverized and cracked at high temperature, and the adhesive force between a surface coating and the sealant after spraying is not influenced; in addition, because the C-C bond energy is greater than the C-N bond energy, the long-chain structures at two ends can adopt a pure polyether structure without carbamate, the heat resistance of the sealant is further improved, and the introduced polysiloxane chain segment has high flexibility, so that the flexibility of the sealant can be ensured, and the sealant is prevented from becoming brittle and cracking.
The silane modified polyether provided by the invention can adjust the end group structure to obtain polymers with different activities, can adopt polydimethylsiloxane chain segments with different molecular weights, can adjust the molecular weight and viscosity of the sealant according to application requirements, and can ensure the heat resistance and finishing property of the sealant by selecting the polydimethylsiloxane with the polymerization degree of 10-100 so as to meet the spraying requirement of the process sealant.
Detailed Description
The following is further detailed by way of specific embodiments:
example 1
85 parts of silane modified polyether with the average molecular weight of 14274, 50 parts of polypropylene glycol PPG3000, 10 parts of diisodecyl phthalate, 120 parts of nano calcium carbonate, 50 parts of heavy calcium carbonate, 10 parts of kaolin, 6 parts of polyether with the specific surface area of 150m2Adding the fumed silica/g into a high-speed dispersion machine, stirring at a low speed for 20min until the mixture is uniform, heating the material to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; and (3) cooling the mixed material to below 45 ℃, adding 3 parts of carbon black color paste, 5.5 parts of oligomer vinyl trimethoxy silane, 1.5 parts of benzotriazole ultraviolet absorbent, 1.5 parts of hindered amine light stabilizer, 3 parts of N-beta- (aminoethyl) -gamma-aminopropyl trimethoxy silane, 0.5 part of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 0.7 part of dibutyltin dilaurate, stirring for 40min under the vacuum degree of-0.085 MPa, and discharging to obtain the industrial heat-resistant silane modified polyether sealant.
Example 2
Adding 96 parts of silane modified polyether with the average molecular weight of 10012, 40 parts of diisononyl phthalate, 100 parts of nano calcium carbonate, 40 parts of kaolin, 20 parts of silica powder, 5 parts of titanium dioxide and 2 parts of polyamide wax into a high-speed dispersion machine, stirring at a low speed for 20min until the materials are uniform, heating the materials to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; and (3) cooling the mixed material to below 45 ℃, adding 6.7 parts of vinyl trimethoxy silane, 1 part of salicylate ultraviolet absorbent, 1 part of hindered amine light stabilizer, 4.2 parts of gamma-aminopropyl trimethoxysilane and 0.2 part of chelated tin, stirring for 40min under the vacuum degree of-0.085 MPa, and discharging to obtain the industrial heat-resistant silane modified polyether sealant.
Example 3
98 parts of silane modified polyether with average molecular weight of 23500, 75 parts of polypropylene glycol PPG3000, 128 parts of nano calcium carbonate, 64 parts of heavy calcium carbonate and 7 parts of polyether with specific surface area of 150m2Adding the fumed silica/g into a high-speed dispersion machine, stirring at a low speed for 20min until the mixture is uniform, heating the material to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; and (3) cooling the mixed material to below 45 ℃, adding 5 parts of oligomer vinyl trimethoxy silane, 2 parts of a benzophenone ultraviolet absorbent, 2 parts of a hindered amine light stabilizer, 3.6 parts of gamma-aminopropyl triethoxysilane, 1.8 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane and 0.8 part of stannous octoate, stirring for 40min under the vacuum degree of-0.085 MPa, and discharging to obtain the industrial heat-resistant silane modified polyether sealant.
Example 4
98 parts of silane modified polyether with average molecular weight of 23500, 70 parts of polypropylene glycol PPG3000, 10 parts of diisodecyl phthalate, 128 parts of nano calcium carbonate, 50 parts of heavy calcium carbonate, 10 parts of kaolin, 7 parts of resin with specific surface area of 150m2Adding the fumed silica/g into a high-speed dispersion machine, stirring at a low speed for 20min until the mixture is uniform, heating the material to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; when the temperature of the mixed material is reduced to below 45 ℃, 7 parts of vinyl triethoxysilane, 2 parts of salicylate ultraviolet absorbent, 2 parts of hindered amine light stabilizer and 4 parts of gamma-methacryloyloxyAnd stirring the propyl trimethoxy silane, 1.2 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.4 parts of dibutyltin dilaurate under the vacuum degree of-0.085 MPa for 40min, and discharging to obtain the silane modified polyether sealant.
Comparative example 1
98 parts of commercial trimethoxy terminated silane modified polyether, 75 parts of polypropylene glycol PPG3000, 128 parts of nano calcium carbonate, 64 parts of heavy calcium carbonate and 7 parts of polyether with the specific surface area of 150m2Adding the fumed silica/g into a high-speed dispersion machine, stirring at a low speed for 20min until the mixture is uniform, heating the material to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; and (3) cooling the mixed material to below 45 ℃, adding 5.2 parts of oligomer vinyl trimethoxy silane, 2 parts of a benzophenone ultraviolet absorbent, 2 parts of a hindered amine light stabilizer, 3.6 parts of gamma-aminopropyl triethoxysilane, 1.8 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane and 0.8 part of stannous octoate, stirring for 40min under the vacuum degree of-0.085 MPa, and discharging to obtain the industrial heat-resistant silane modified polyether sealant.
Comparative example 2
98 parts of silane modified polyether with n value of 500 and average molecular weight of 23500, 75 parts of polypropylene glycol PPG3000, 128 parts of nano calcium carbonate, 64 parts of heavy calcium carbonate and 7 parts of heavy calcium carbonate with specific surface area of 150m2Adding the fumed silica/g into a high-speed dispersion machine, stirring at a low speed for 20min until the mixture is uniform, heating the material to 110 ℃, and stirring for 2h under the vacuum degree of-0.085 MPa to obtain a mixed material; and (3) cooling the mixed material to below 45 ℃, adding 5.2 parts of oligomer vinyl trimethoxy silane, 2 parts of a benzophenone ultraviolet absorbent, 2 parts of a hindered amine light stabilizer, 3.6 parts of gamma-aminopropyl triethoxysilane, 1.8 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane and 0.8 part of stannous octoate, stirring for 40min under the vacuum degree of-0.085 MPa, and discharging to obtain the industrial heat-resistant silane modified polyether sealant.
Performance testing
The test method of the tensile strength and the elongation at break of the sealant comprises the following steps: reference GB/T528-2009;
testing the adhesive force of the sealant and the coating: reference GB/T9286-1998;
the method for testing the quality loss rate of the sealant comprises the following steps: reference GB/T13477.19;
the silane modified polyether sealants of examples 1-4 and comparative examples 1-2 were tested by using the relevant standards, and the test results are shown in the following table:
TABLE 1 relevant test results of silane modified polyether sealants of examples 1-4 and comparative examples 1-2
According to the test results in table 1, the comprehensive mechanical properties of example 3 are best and the mass loss rate is lowest by optimizing the mixture ratio of the components; the conventional silane modified polyether sold in the market is selected in the comparative example 1, the high temperature resistance is poor, the conventional silane modified polyether is softened after being aged for 7 days at 120 ℃, and the sealant has no strength; the comparative example 2 selects the silane modified polyether with larger n value, the coating adhesive force of the sealant is influenced by excessive proportion of polysiloxane chain segments, the advantage that the silane modified polyether sealant can be coated is lost, and the use of products is limited.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The industrial heat-resistant silane modified polyether sealant comprises silane modified polyether and is characterized in that: the structural formula of the silane modified polyether is as follows:
wherein n and m are the number of repeating units, the value of n is 3-300, and the value of m is 20-500; r is methyl or ethyl, R’Is methyl, methoxy or ethoxy; the molecular weight of the silane modified polyether is 8000-25000, and the viscosity is 10000-50000 mPa.s.
2. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 1, wherein: the raw materials comprise the following components in parts by weight:
80-100 parts of silane modified polyether;
50-80 parts of a plasticizer;
160-200 parts of a filler;
0.1-10 parts of thixotropic agent;
1-2 parts of an ultraviolet absorber;
1-2 parts of a light stabilizer;
4-7 parts of a water removing agent;
3-6 parts of a coupling agent;
1-2 parts of a catalyst.
3. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the plasticizer is at least one of polypropylene glycol or phthalate.
4. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the filler is at least one of nano calcium carbonate, heavy calcium carbonate, kaolin or silica micropowder; the thixotropic agent is at least one of polyamide wax or fumed silica.
5. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the ultraviolet absorbent is at least one of salicylate ultraviolet absorbent, benzophenone ultraviolet absorbent or benzotriazole ultraviolet absorbent; the light stabilizer is at least one of hindered amine light stabilizers.
6. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the water removing agent is at least one of oligomer vinyl trimethoxy silane, vinyl trimethoxy silane or vinyl triethoxy silane.
7. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the coupling agent is at least one of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-aminopropyltrimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and gamma-aminopropyltriethoxysilane.
8. The industrial heat-resistant silane-modified polyether sealant as claimed in claim 2, wherein: the catalyst is at least one of dibutyltin dilaurate, stannous octoate and chelated tin.
9. The preparation method of the industrial heat-resistant silane modified polyether sealant as claimed in any one of claims 2 to 8, characterized by comprising the following steps:
step A: weighing raw materials in proportion, mixing the silane modified polyether, the plasticizer, the filler and the thixotropic agent, and stirring at a low speed for 20min to be uniform;
and B: b, stirring the stirred substance in the step A at a high speed for 2 hours under the conditions that the vacuum degree is-0.085 MPa to 0.1MPa and the temperature is 100 ℃ to 120 ℃ to obtain a mixed material I;
and C: cooling the mixed material I to below 40 ℃, adding a water removing agent, and stirring at a high speed for 10min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa to obtain a mixed material II;
step D: adding an ultraviolet absorbent, a light stabilizer and a coupling agent into the mixed material II, and stirring at a high speed for 10min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa to obtain a mixed material III;
step E: adding a catalyst into the mixed material III, stirring at a high speed for 20min under the condition that the vacuum degree is-0.085 MPa-0.1 MPa, and discharging to obtain the silane modified polyether sealant.
10. A silane modified polyether, which is characterized in that: the silane modified polyether has the following structural formula:
wherein n and m are the number of repeating units, the value of n is 3-300, and the value of m is 20-500; r is methyl or ethyl, R’Is methyl, methoxy or ethoxy; the average molecular weight of the polymer is 8000-25000, and the viscosity is 10000-50000 mPa.s.
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| CN113249075A (en) * | 2021-04-15 | 2021-08-13 | 快思瑞科技(上海)有限公司 | Sealant composition, silane modified polyether sealant and preparation method thereof |
| CN113621123A (en) * | 2021-09-07 | 2021-11-09 | 福州大学 | Antibacterial enhanced low-temperature-resistant slow-resilience polyurethane sponge and preparation method thereof |
| CN113621336A (en) * | 2021-07-28 | 2021-11-09 | 杭州之江新材料有限公司 | High-temperature curing silane modified polyether sealant and preparation method and use method thereof |
| CN114874747A (en) * | 2022-05-05 | 2022-08-09 | 安徽斯迈特新材料股份有限公司 | Preparation method of high-temperature-resistant and strong-ultraviolet-resistant MS (Murashige & Skoog) adhesive |
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