CN108504318B - High-transparency and high-strength silane modified polyether elastic sealant and preparation method thereof - Google Patents

High-transparency and high-strength silane modified polyether elastic sealant and preparation method thereof Download PDF

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CN108504318B
CN108504318B CN201810206325.3A CN201810206325A CN108504318B CN 108504318 B CN108504318 B CN 108504318B CN 201810206325 A CN201810206325 A CN 201810206325A CN 108504318 B CN108504318 B CN 108504318B
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modified polyether
silane
silane modified
sealant
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CN108504318A (en
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王雷
麦裕良
严石静
栾安博
金震
王全勇
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Institute of Chemical Engineering of Guangdong Academy of Sciences
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Guangdong Research Institute Of Petrochemical And Fine Chemical Engineering
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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
    • C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
    • C09J171/02—Polyalkylene oxides
    • 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
    • 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
    • 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
    • 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
    • C08K2201/002—Physical properties
    • C08K2201/006—Additives being defined by their surface area
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
    • 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
    • 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

Abstract

The invention discloses a silane modified polyether elastic sealant with high transparency and high strength and a preparation method thereof. The silane modified polyether elastic sealant with high transparency and high strength is prepared from the following raw materials in parts by mass: 100 parts of a base polymer; 10-40 parts of a plasticizer; 5-25 parts of white carbon black; 1-5 parts of a crosslinking agent; 0.5-3 parts of a water removing agent; 0.1-1 part of ultraviolet absorbent; 0.1-1 part of a light stabilizer; 0.2-3 parts of an adhesion promoter; 0.2-1 part of a catalyst; also discloses a preparation method of the silane modified polyether elastic sealant. The high-transparency and high-strength silane modified polyether elastic sealant can be cured by moisture at room temperature, has the tensile strength of more than 5MPa and the light transmittance of more than 80 percent after being cured, has the characteristics of good elasticity, ultraviolet radiation resistance, simple preparation process and the like, and can be used as a high-strength environment-friendly bonding material in various industrial fields.

Description

High-transparency and high-strength silane modified polyether elastic sealant and preparation method thereof
Technical Field
The invention relates to a silane modified polyether elastic sealant with high transparency and high strength and a preparation method thereof.
Background
The silicon modified polyether sealant has the characteristic of moisture curing due to the special polyether main chain structure and siloxane end group structure of the basic polymer, thereby having the performance advantages of polyurethane and silicone sealant, and having the performance and application characteristics of environmental friendliness, low stain, good finishing property, good weather resistance and durability, good bonding property, convenient sizing and the like. Thus, it has very wide applications in the fields of construction, rail transit, automobiles, electronic appliances, and other industries.
Most of the conventional silicon modified polyether sealants are opaque paste-like rubber materials, and the strength is relatively low, so that the application of the conventional silicon modified polyether sealants in occasions requiring high bonding strength, high tensile strength and high transparency is limited, and the conventional silicon modified polyether sealants cannot replace transparent silicone rubber and high-mechanical-strength polyurethane sealants in the bonding fields of high-grade home interior decoration and automobile windshields. In the prior art, CN106833321A discloses a transparent mildew-proof silane modified polyether sealant and a preparation method thereof, wherein the sealant comprises the following components by weight: 55-88 parts of base polymer, 0-12 parts of plasticizer, 8-20 parts of filler, 0.3-2 parts of water removing agent, 0-1 part of ultraviolet absorbent, 0-1 part of antioxidant, 0.2-2 parts of catalyst and 0.2-5 parts of coupling agent. Although the sealant has good mildew-proof effect, the surface drying time of 1-2 h is still long, the appearance is transparent, and the specific light transmittance is unknown. CN106634770A and CN107177340A successively disclose a single-component transparent silicon modified polyether sealant and a waterproof and mildew-proof silane modified polyether sealant and respective preparation methods thereof, and although a sealing rubber material prepared based on an alpha-silane end-capped modified polyether base polymer has relatively short surface drying time (25-40min) and certain light transmittance (60-90%), the tensile strength (0.9-1.8MPa) is low. In general, transparent silane-modified polyether sealants still have the problem of unbalanced properties, and therefore, there is a need for a silicon-modified polyether sealant with appropriate surface drying time, high transparency and high strength.
Disclosure of Invention
The invention aims to provide a silane modified polyether elastic sealant with high transparency and high strength and a preparation method thereof. In the invention, the high transparency means that the light transmittance of the silane modified polyether elastic sealant is more than 80% according to a GB/T2410-2009 test, and the high strength means that the tensile strength of the silane modified polyether elastic sealant is more than 5MPa according to a GB/T528-2009 test.
The technical scheme adopted by the invention is as follows:
a silane modified polyether elastic sealant with high transparency and high strength is prepared from the following raw materials in parts by mass:
Figure BDA0001595993700000011
Figure BDA0001595993700000021
the basic polymer is at least one of silane terminated polypropylene glycol with the branching degree of more than or equal to 3 and silane terminated polyether with polytetrahydrofuran chain segment.
In the silane modified polyether elastic sealant, the number average molecular weight of a basic polymer is 6000 to 30000 daltons.
In the silane modified polyether elastic sealant, the white carbon black is gas phase hydrophobic white carbon black, and the specific surface area of the white carbon black is 100m2/g～400m2/g。
In the silane modified polyether elastic sealant, a cross-linking agent is composed of the following raw materials in percentage by mass: 80-100% of a primary crosslinking agent and 0-20% of a secondary crosslinking agent;
the structural general formula of the main crosslinking agent is as follows:
Figure BDA0001595993700000022
wherein R is1Is composed of
Figure BDA0001595993700000023
-OCH2CH2O-、-OCH2CH2CH2O-、-OCH2CH2OCH2CH2Any one of O < - >;
R2is composed of
Figure BDA0001595993700000024
Any one of the above;
R3is C1～C5Any one of alkyl, methoxy and ethoxy;
R4is methyl or ethyl;
the secondary cross-linking agent is at least one of methyl tributyl ketoxime silane, vinyl tributyroxime silane, hexamethylene diamine methyl triethoxysilane, diethyl amine methyl triethoxysilane and anilino methyl trimethoxysilane.
In the silane modified polyether elastic sealant, the plasticizer is at least one of polyether polyol with the number average molecular weight of 1000-4000 daltons, didecyl phthalate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate and triethylene glycol dibenzoate.
In the silane modified polyether elastic sealant, the water removing agent is at least one of hexamethyldisilazane, vinyl trimethoxy silane and vinyl triethoxy silane.
In the silane modified polyether elastic sealant, the ultraviolet absorbent is at least one of benzotriazole, benzophenone, salicylate, substituted acrylonitrile and triazine absorbent; the light stabilizer is hindered amine light stabilizer.
In the silane modified polyether elastic sealant, the adhesion promoter is at least one of amino siloxane, mercapto siloxane and epoxy siloxane.
In the silane modified polyether elastic sealant, the catalyst is an organic tin compound.
The preparation method of the silane modified polyether elastic sealant with high transparency and high strength comprises the following steps:
1) adding a basic polymer, a plasticizer, white carbon black, an ultraviolet absorbent and a light stabilizer into a stirrer, heating to 100-110 ℃, and stirring in vacuum to obtain a mixed material;
2) cooling the mixed material in the step 1) to below 50 ℃, adding a water removing agent, a cross-linking agent and an adhesion promoter, and continuing vacuum stirring;
3) adding a catalyst, and stirring in vacuum to obtain the silane modified polyether elastic sealant with high transparency and high strength.
The invention has the beneficial effects that:
the high-transparency and high-strength silane modified polyether elastic sealant can be cured by moisture at room temperature, has the tensile strength of more than 5MPa and the light transmittance of more than 80 percent after being cured, has the characteristics of good elasticity, ultraviolet radiation resistance, simple preparation process and the like, and can be used as a high-strength environment-friendly bonding material in various industrial fields.
Specifically, the method comprises the following steps:
1) the invention takes silane terminated polypropylene glycol with a branched structure (the branching degree is more than or equal to 3), silane terminated polyether containing polytetrahydrofuran chain segment or a composition thereof as a prepolymer, and increases the mechanical strength of base glue by increasing the crosslinking point of a basic polymer or introducing the polytetrahydrofuran chain segment;
2) according to the invention, silane containing ether bond groups and six hydrolyzable groups is used as a main cross-linking agent, and methyl tributyrinoxime silane, vinyl tributyrinoxime silane, methyl trimethoxy silane, methyl triethoxy silane and the like are used as secondary cross-linking agents, so that the high transparency and the proper surface drying time of the sealant are ensured, and the cross-linking density of the sealant is increased, thereby improving the mechanical strength of the sealant;
3) the invention takes hydrophobic gas-phase silicon dioxide and the like as the reinforcing filler, thereby obviously improving the mechanical strength of the sealant material;
4) the cured sealing adhesive disclosed by the invention is high in mechanical strength and transparency, and meets the requirements of high transparency and high strength of the silicon modified polyether sealing adhesive according to the tensile strength of more than 5MPa and the light transmittance of more than 80 percent tested by GB/T528-.
Detailed Description
A silane modified polyether elastic sealant with high transparency and high strength is prepared from the following raw materials in parts by mass:
Figure BDA0001595993700000041
the basic polymer is at least one of silane terminated polypropylene glycol with the branching degree of more than or equal to 3 and silane terminated polyether with polytetrahydrofuran chain segment.
Preferably, in the silane modified polyether elastic sealant, the number average molecular weight of the basic polymer is 6000 to 30000 daltons; further preferably, the number average molecular weight of the base polymer is 10000 to 20000 daltons.
Preferably, in the silane modified polyether elastic sealant, the white carbon black is gas phase hydrophobic white carbon black, and the specific surface area of the white carbon black is 100m2/g～400m2/g。
Preferably, in the silane modified polyether elastic sealant, the cross-linking agent is composed of the following raw materials in percentage by mass: 80-100% of a primary crosslinking agent and 0-20% of a secondary crosslinking agent;
the structural general formula of the main crosslinking agent is as follows:
Figure BDA0001595993700000042
wherein R is1Is composed of
Figure BDA0001595993700000043
-OCH2CH2O-、-OCH2CH2CH2O-、-OCH2CH2OCH2CH2Any one of O < - >;
R2is composed of
Figure BDA0001595993700000044
Any one of the above;
R3is C1～C5Any one of alkyl, methoxy and ethoxy;
R4is methyl or ethyl;
further preferably, the primary crosslinking agent is an alpha-functionality coupling agent containing six hydrolyzable groups, and the structural formula is as follows:
Figure BDA0001595993700000051
preferably, the secondary crosslinking agent is at least one of methyltributanone oxime silane, vinyl tributone oxime silane, hexamethylene diamine methyl triethoxysilane, diethylamino methyl triethoxysilane and anilino methyl trimethoxysilane.
Preferably, in the silane modified polyether elastic sealant, the plasticizer is at least one of polyether polyol with the number average molecular weight of 1000-4000 daltons, didecyl phthalate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate and triethylene glycol dibenzoate.
Preferably, in the silane modified polyether elastic sealant, the water removing agent is at least one of hexamethyldisilazane, vinyltrimethoxysilane and vinyltriethoxysilane.
Preferably, in the silane modified polyether elastic sealant, the ultraviolet absorbent is at least one of benzotriazole, benzophenone, salicylate, substituted acrylonitrile and triazine absorbent.
Preferably, in the silane modified polyether elastic sealant, the light stabilizer is a hindered amine light stabilizer; further preferably, the hindered amine light stabilizer is at least one selected from 770, 944, 622, 783, 791 and HS-508.
Preferably, in the silane modified polyether elastic sealant, the adhesion promoter is at least one of amino siloxane, mercapto siloxane and epoxy siloxane; more preferably, the adhesion promoter is at least one of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, ureidopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, diethylenetriaminopropyltrimethoxysilane and gamma-glycidyloxypropyltrimethoxysilane; still more preferably, the adhesion promoter is at least one of aminopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane and gamma-glycidoxypropyltrimethoxysilane.
Preferably, in the silane modified polyether elastic sealant, the catalyst is an organic tin compound; more preferably, the catalyst is at least one of stannous octoate, dibutyltin dilaurate, di-n-octyltin dilaurate, dibutyltin diacetate and dibutyltin di (dodecyl sulfur); still more preferably, the catalyst is at least one of stannous octoate and dibutyltin dilaurate.
The preparation method of the silane modified polyether elastic sealant with high transparency and high strength comprises the following steps:
1) adding a basic polymer, a plasticizer, white carbon black, an ultraviolet absorbent and a light stabilizer into a stirrer, heating to 100-110 ℃, and stirring in vacuum to obtain a mixed material;
2) cooling the mixed material in the step 1) to below 50 ℃, adding a water removing agent, a cross-linking agent and an adhesion promoter, and continuing vacuum stirring;
3) adding a catalyst, and stirring in vacuum to obtain the silane modified polyether elastic sealant with high transparency and high strength.
Preferably, in the step 1) of the preparation method, the vacuum stirring time is 2-3 h; in the step 2) of the preparation method, the vacuum stirring time is 10min to 30 min; in the step 3) of the preparation method, the vacuum stirring time is 10min to 30 min.
Preferably, the vacuum degree of the vacuum stirring in the preparation method is 0.09MPa to 0.095 MPa.
The present invention will be described in further detail with reference to specific examples. The starting materials used in the examples are, unless otherwise specified, commercially available from conventional sources.
Example 1:
the high clarity and high strength silane modified polyether elastomeric sealant of example 1 was prepared as follows:
1) 2kg of trimethoxypropylsilane-terminated branched polypropylene glycol (degree of branching 3, number average molecular weight 10000 Dalton), 200g of polypropylene glycol (number average molecular weight 4000 Dalton), 240g of hydrophobic fumed silica (specific surface area 300 m)2Adding 10g of ultraviolet absorbent UV-326(2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole) and 10g of hindered amine light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 3 hours;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding 60g of vinyl trimethoxy silane, 20g of cross-linking agent I and 20g N- (beta-aminoethyl) -gamma-aminopropyl triethoxysilane, and continuing to stir in vacuum for 20 min;
3) and adding 20g of dibutyltin dilaurate, and stirring for 20min in vacuum to obtain the silane modified polyether elastic sealant with high transparency and high strength.
The cross-linking agent I in the step 2) has the following structural formula:
Figure BDA0001595993700000061
example 2:
the high clarity and high strength silane modified polyether elastomeric sealant of example 2 was prepared as follows:
1) 2kg of a trimethoxypropylsilane-terminated branched polypropylene glycol (degree of branching of 4, number average molecular weight 16000 Dalton), 400g of a polypropylene glycol (number average molecular weight 3000 Dalton), 200g of a hydrophobic fumed silica (specific surface area 300 m)2Adding 2g of ultraviolet absorbent UV-326(2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole) and 20g of hindered amine light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 2.5 h;
2) after the temperature of the mixture obtained in step 1) is reduced to below 50 ℃, 30g of vinyltrimethoxysilane, 40g of a crosslinking agent I (the same as the crosslinking agent I used in example 1) and 20g N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane are added, and the vacuum stirring is continued for 30 min;
3) and adding 20g of dibutyltin dilaurate, and stirring for 20min in vacuum to obtain the high-strength silane modified polyether elastic sealant.
Example 3:
the high clarity and high strength silane modified polyether elastomeric sealant of example 3 was prepared as follows:
1) 2kg of a triethoxymethylsilane-terminated polyether block prepolymer (number average molecular weight 16000 Dalton, comprising two polypropylene glycol blocks having a number average molecular weight of 6000 Dalton and one polytetrahydrofuran block having a number average molecular weight of 4000 Dalton), 600g of polypropylene glycol (number average molecular weight 2000 Dalton), 160g of hydrophobic fumed silica (specific surface area 200 m)2Per g), 10g of UV absorber UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 8g of hindered amineAdding a light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 2 hours;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding 20g of vinyltrimethoxysilane, 54g of a cross-linking agent II, 6g of hexamethylenediamine methyl triethoxysilane and 10g N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, and continuing to stir in vacuum for 30 min;
3) adding 4g of stannous octoate, and stirring for 30min in vacuum to obtain the high-strength silane modified polyether elastic sealant.
The structural formula of the cross-linking agent II in the step 2) is as follows:
Figure BDA0001595993700000071
example 4:
the high clarity and high strength silane modified polyether elastomeric sealant of example 4 was prepared as follows:
1) 2kg of trimethoxymethylsilane-terminated polyether block prepolymer (number average molecular weight 20000 Dalton, comprising two polypropylene glycol blocks having a number average molecular weight 8000 Dalton and two polytetrahydrofuran blocks having a number average molecular weight 2000 Dalton), 800g of polypropylene glycol (number average molecular weight 2000 Dalton), 100g of hydrophobic fumed silica (specific surface area 130m2Adding 20g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 2g of hindered amine light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 2 hours;
2) after the temperature of the mixed material in the step 1) is reduced to below 50 ℃, 20g of vinyl trimethoxy silane, 80g of cross-linking agent II (the same as the cross-linking agent II used in the example 3) and 60g of gamma-glycidyl ether oxypropyl trimethoxy silane are added, and the vacuum stirring is continued for 30 min;
3) adding 5g of stannous octoate, and stirring for 30min in vacuum to obtain the high-strength silane modified polyether elastic sealant.
Example 5:
the high clarity and high strength silane modified polyether elastomeric sealant of example 5 was prepared as follows:
1) 1kg of trimethoxypropylsilane-terminated branched polypropylene glycol (degree of branching of 4, number average molecular weight 16000 Dalton), 1kg of trimethoxymethylsilane-terminated block polyether prepolymer (number average molecular weight 20000 Dalton, comprising two polypropylene glycol segments with a number average molecular weight of 8000 Dalton and two polytetrahydrofuran segments with a number average molecular weight of 2000 Dalton), 800g of polypropylene glycol (number average molecular weight 1000 Dalton), 100g of hydrophobic fumed silica (specific surface area 100m2Adding 10g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 10g of hindered amine light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 2 hours;
2) after the temperature of the mixed material in the step 1) is reduced to below 50 ℃, 20g of vinyl trimethoxy silane, 80g of cross-linking agent II (the same as the cross-linking agent II used in the example 3), 20g of methyl tributyrinoxime silane and 20g of gamma-glycidoxypropyl trimethoxy silane are added, and the vacuum stirring is continued for 25 min;
3) adding 6g of stannous octoate, and stirring for 30min in vacuum to obtain the silane modified polyether elastic sealant with high transparency and high strength.
Comparative example:
the polyether sealant of comparative example 1 was prepared as follows:
1) 2kg of a dimethoxymethylpropyl-terminated polyether prepolymer (MS-S203H, Brillouin chemical Co., Ltd., Japan, number average molecular weight of more than 8000 dalton), 200g of polypropylene glycol (number average molecular weight of 2000 dalton), 240g of hydrophobic fumed silica (specific surface area of 300 m)2Adding 10g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 10g of hindered amine light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, heating the materials to 100-110 ℃, and stirring in vacuum for 3 hours;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding 40g of vinyl trimethoxy silane, 60g of aminopropyl trimethoxy silane and 60g N- (beta-aminoethyl) -gamma-aminopropyl triethoxy silane, and continuing to stir in vacuum for 30 min;
3) and adding 20g of dibutyltin dilaurate, and stirring for 30min in vacuum to obtain the silane modified polyether sealant.
Test example:
the sealants in examples 1 to 5 and comparative example were prepared into standard sample strips, cured for 7 days at 25 ℃ in an environment of 50% relative humidity, and then subjected to performance tests, the test results being shown in table 1.
TABLE 1 Performance test results for sealants of examples 1-5 and comparative examples
Figure BDA0001595993700000091
Note: the tensile strength and the elongation at break are tested according to the national standard GB/T528-.
From the comparison of the test results in table 1, it can be seen that compared with the comparative example, the mechanical strength and transparency of the sealant prepared in examples 1-5 after curing are significantly improved, and the requirements of high transparency and high strength of the silicon modified polyether sealant are met, namely the tensile strength tested according to GB/T528-.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (8)

1. A silane modified polyether elastic sealant with high transparency and high strength is characterized in that: the composite material is prepared from the following raw materials in parts by mass:
Figure FDA0002796270200000011
the basic polymer is at least one of silane terminated polypropylene glycol with the branching degree of more than or equal to 3 and silane terminated block polyether containing polytetrahydrofuran chain segment;
the cross-linking agent is composed of the following raw materials in percentage by mass: 80-100% of a primary crosslinking agent and 0-20% of a secondary crosslinking agent;
the main crosslinking agent is an alpha-functionality coupling agent containing six hydrolyzable groups, and the structural formula of the main crosslinking agent is as follows:
Figure FDA0002796270200000012
the secondary cross-linking agent is at least one of methyltributone oxime silane, vinyl tributyloxime silane, hexamethylene diamine methyl triethoxysilane, diethylamino methyl triethoxysilane and anilino methyl trimethoxysilane;
the ultraviolet absorbent is at least one of benzotriazole, benzophenones, salicylates, substituted acrylonitrile and triazine absorbents;
the light stabilizer is a hindered amine light stabilizer.
2. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the number average molecular weight of the base polymer is 6000 to 30000 daltons.
3. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the white carbon black is gas phase hydrophobic white carbon black, and the specific surface area of the white carbon black is 100m2/g～400m2/g。
4. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the plasticizer is at least one of polyether polyol with the number average molecular weight of 1000-4000 daltons, didecyl phthalate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate and triethylene glycol dibenzoate.
5. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the water removing agent is at least one of hexamethyldisilazane, vinyl trimethoxy silane and vinyl triethoxy silane.
6. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the adhesion promoter is at least one of amino siloxane, mercapto siloxane and epoxy siloxane.
7. The high clarity and high strength silane modified polyether elastomeric sealant as claimed in claim 1, wherein: the catalyst is an organic tin compound.
8. The preparation method of the silane modified polyether elastic sealant with high transparency and high strength as claimed in any one of claims 1 to 7, is characterized in that: the method comprises the following steps:
1) adding a basic polymer, a plasticizer, white carbon black, an ultraviolet absorbent and a light stabilizer into a stirrer, heating to 100-110 ℃, and stirring in vacuum to obtain a mixed material;
2) cooling the mixed material in the step 1) to below 50 ℃, adding a water removing agent, a cross-linking agent and an adhesion promoter, and continuing vacuum stirring;
3) adding a catalyst, and stirring in vacuum to obtain the silane modified polyether elastic sealant with high transparency and high strength.
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