CN108130033B - High-strength silane modified block polyether elastic sealant and preparation method thereof - Google Patents

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

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CN108130033B
CN108130033B CN201711377043.1A CN201711377043A CN108130033B CN 108130033 B CN108130033 B CN 108130033B CN 201711377043 A CN201711377043 A CN 201711377043A CN 108130033 B CN108130033 B CN 108130033B
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block polyether
parts
modified block
silane modified
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CN108130033A (en
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严石静
麦裕良
王雷
栾安博
路芳
王全勇
金震
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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
    • 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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Material Composition (AREA)
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Abstract

The invention discloses a high-strength silane modified block polyether elastic sealant and a preparation method thereof, wherein the high-strength silane modified block polyether elastic sealant is prepared from the following raw materials in parts by mass: silane-terminated block polyether prepolymer: 100 parts of (A); plasticizer: 10-40 parts; nano calcium carbonate: 60-120 parts; white carbon black: 5-12 parts of a solvent; water removal agent: 1-3 parts; ultraviolet absorber: 0.1-1 part; light stabilizer: 0.1-1 part; vulcanizing agent: 1-5 parts; an adhesion promoter: 1-5 parts; catalyst: 0.1 to 1 portion. The preparation method of the high-strength silane modified block polyether elastic sealant is simple, and all the components are mixed uniformly in batches. The high-strength silane modified block polyether elastic sealant can be cured by moisture at room temperature, has high mechanical strength, good elasticity and ultraviolet radiation resistance after being cured, has simple preparation process, and can be used as a high-strength environment-friendly bonding material in various industrial fields.

Description

High-strength silane modified block polyether elastic sealant and preparation method thereof
Technical Field
The invention relates to a high-strength silane modified block polyether elastic sealant and a preparation method thereof.
Background
The silicon modified polyether sealant integrates the structural and performance characteristics of polyurethane and silicone sealant, and has the advantages of environmental friendliness, low staining property, good finishing property, good weather resistance and durability, good bonding property, convenient sizing and the like. The silicon modified polyether sealant is prepared by taking silane modified polypropylene glycol as a base adhesive, adding a filler, a coupling agent and other functional auxiliaries, and stirring and mixing in vacuum. The tensile strength and the shear strength of the vulcanized silicon modified polyether sealant are respectively 1-3.5 MPa and 1-4 MPa, and the tensile strength and the shear strength of the vulcanized polyurethane sealant are respectively more than 6MPa and 5 MPa. Therefore, the strength of the silicon modified polyether sealant is still insufficient, and the silicon modified polyether sealant cannot be applied to occasions requiring high bonding strength and high tensile strength, such as the bonding of rail transit passenger cars and automobile windshields. Researches show that the mechanical strength of the silicon modified polyether sealant can be improved to a certain extent by adding the reinforced filler component, but the effect is not obvious. Therefore, there is a need to develop a high strength silicone modified polyether sealant.
Disclosure of Invention
The invention aims to provide a high-strength silane modified block polyether elastic sealant and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a high-strength silane modified block polyether elastic sealant is composed of the following raw materials in parts by mass:
silane-terminated block polyether prepolymer: 100 parts of (A);
plasticizer: 10-40 parts;
nano calcium carbonate: 60-120 parts;
white carbon black: 5-12 parts of a solvent;
water removal agent: 1-3 parts;
ultraviolet absorber: 0.1-1 part;
light stabilizer: 0.1-1 part;
vulcanizing agent: 1-5 parts;
an adhesion promoter: 1-5 parts;
catalyst: 0.1 to 1 portion.
The general structural formula of the end silane block polyether prepolymer is as follows:
Figure GDA0002570470780000021
wherein R is1Is composed of
Figure GDA0002570470780000022
or-OCH2CH2CH2-；
R2is-OCH2O-、-OCH2CH2O-、-OCO(CH2)1～8CH2O-、
Figure GDA0002570470780000023
Figure GDA0002570470780000024
One of (1);
R3is-CH2CH2CH2CH2O-；
R4Is composed of
Figure GDA0002570470780000025
R5Is C1～C5One of alkyl, methoxy and ethoxy;
R6is methyl or ethyl;
m is an integer of 17 to 138;
n is an integer of 13-110;
z is an integer of 1-20;
the number average molecular weight of the silyl-terminated block polyether prepolymer is 6000-40000.
The plasticizer is polypropylene glycol with the number average molecular weight of 1000-6000.
The white carbon black is gas-phase hydrophobic white carbon black, and the specific surface area of the white carbon black is 100-400 m2/g。
The water removal agent is at least one of oxazolidines, hexamethyldisilazane, vinyl trimethoxy silane and vinyl triethoxy silane.
The ultraviolet absorbent is at least one of benzotriazoles, benzophenones, salicylates, substituted acrylonitrile and triazines.
The light stabilizer is a hindered amine light stabilizer.
The vulcanizing agent is silane containing six trimethoxy groups or triethoxy groups.
The adhesion promoter is at least one of amino siloxane, mercapto siloxane and epoxy siloxane.
The catalyst is at least one of stannous octoate, dibutyltin dilaurate, di-n-octyltin laurate, dibutyltin diacetate, dibutyltin di (dodecyl sulfur) and isooctyl dimethyltin dimercaptoacetate.
The preparation method of the high-strength silane modified block polyether elastic sealant comprises the following steps:
1) adding the silyl-terminated block polyether prepolymer, the plasticizer, the nano calcium carbonate, the white carbon black, the ultraviolet absorbent and the light stabilizer into a stirrer, and stirring for 2-3 hours in vacuum;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding a water removing agent, a vulcanizing agent and an adhesion promoter, and continuing to stir in vacuum for 20-40 min;
3) adding a catalyst, and stirring for 20-40 min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
The invention has the beneficial effects that: the high-strength silane modified block polyether elastic sealant can be cured by moisture at room temperature, has high mechanical strength, good elasticity and ultraviolet radiation resistance after being cured, has simple preparation process, and can be used as a high-strength environment-friendly bonding material in various industrial fields.
1) According to the invention, silane-terminated polyether containing a polytetrahydrofuran chain segment is used as a prepolymer, and the mechanical strength of a base adhesive is increased by introducing the polytetrahydrofuran chain segment;
2) the invention takes silane containing six hydrolysable groups as a vulcanizing agent, thereby increasing the crosslinking density of the sealant;
3) the invention takes nano calcium carbonate, hydrophobic fumed silica and the like as reinforcing fillers, and obviously improves the mechanical strength of the sealant material.
Detailed Description
A high-strength silane modified block polyether elastic sealant is composed of the following raw materials in parts by mass:
silane-terminated block polyether prepolymer: 100 parts of (A);
plasticizer: 10-40 parts;
nano calcium carbonate: 60-120 parts;
white carbon black: 5-12 parts of a solvent;
water removal agent: 1-3 parts;
ultraviolet absorber: 0.1-1 part;
light stabilizer: 0.1-1 part;
vulcanizing agent: 1-5 parts;
an adhesion promoter: 1-5 parts;
catalyst: 0.1 to 1 portion.
Preferably, the structural formula of the end silane block polyether prepolymer is as follows:
Figure GDA0002570470780000031
wherein R is1Is composed of
Figure GDA0002570470780000041
or-OCH2CH2CH2-；
R2is-OCH2O-、-OCH2CH2O-、-OCO(CH2)1～8CH2O-、
Figure GDA0002570470780000042
Figure GDA0002570470780000043
One of (1);
R3is-CH2CH2CH2CH2O-；
R4Is composed of
Figure GDA0002570470780000044
R5Is C1～C5One of alkyl, methoxy and ethoxy;
R6is methyl or ethyl;
m is an integer of 17 to 138; preferably, m is an integer of 34-69;
n is an integer of 13-110; preferably, n is an integer of 27 to 55;
z is an integer of 1-20; preferably, z is an integer of 1 to 7;
the number average molecular weight of the silyl-terminated block polyether prepolymer is 6000-40000; preferably, the number average molecular weight of the silyl-terminated block polyether prepolymer is 8000-30000.
Preferably, the plasticizer is polypropylene glycol with the number average molecular weight of 1000-6000.
Preferably, the white carbon black is gas-phase hydrophobic white carbon black, and the specific surface area is 100-400 m2/g。
More preferably, the white carbon black is gas-phase hydrophobic white carbon black, and the specific surface area of the white carbon black is 130-300 m2/g。
Preferably, the water removal agent is at least one of oxazolidines, hexamethyldisilazane, vinyltrimethoxysilane and vinyltriethoxysilane.
More preferably, the water removing agent is vinyl trimethoxy silane.
Preferably, the ultraviolet absorbent is at least one of benzotriazoles, benzophenones, salicylates, substituted acrylonitriles and triazines.
Preferably, the light stabilizer is a hindered amine light stabilizer.
Preferably, the vulcanizing agent is silane containing six trimethoxy groups or triethoxy groups.
Further preferably, the vulcanizing agent is bis (3-trimethoxysilylpropyl) amine or bis [3- (trimethoxysilyl) propyl]Ethylene diamine,
Figure GDA0002570470780000045
Figure GDA0002570470780000051
Wherein R is methyl or ethyl.
Still more preferably, the vulcanizing agent is bis [3- (trimethoxysilyl) propyl group]Ethylene diamine,
Figure GDA0002570470780000052
Wherein R is methyl or ethyl.
Preferably, the adhesion promoter is at least one of aminosiloxane, mercaptosiloxane and epoxysiloxane.
More preferably, the adhesion promoter is at least one of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, ureidopropyltrimethoxysilane, ureidopropyltriethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, diethylenetriaminopropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane and gamma-mercaptopropyltriethoxysilane.
Still more preferably, the adhesion promoter is at least one of aminopropyltrimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane.
Preferably, the catalyst is at least one of stannous octoate, dibutyltin dilaurate, di-n-octyltin laurate, dibutyltin diacetate, dibutyltin bis (dodecyl sulfur) and isooctyl dimethyltin dimercaptoacetate.
Further preferably, the catalyst is at least one of stannous octoate and dibutyltin dilaurate.
The preparation method of the high-strength silane modified block polyether elastic sealant comprises the following steps:
1) adding the silyl-terminated block polyether prepolymer, the plasticizer, the nano calcium carbonate, the white carbon black, the ultraviolet absorbent and the light stabilizer into a stirrer, and stirring for 2-3 hours in vacuum;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding a water removing agent, a vulcanizing agent and an adhesion promoter, and continuing to stir in vacuum for 20-40 min;
3) adding a catalyst, and stirring for 20-40 min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a high-strength silane modified block polyether elastic sealant is prepared by the following steps:
1) 2kg of dimethoxymethylpropylsilane-terminated block polyether prepolymer (number-average molecular weight 8000), 200g of polypropylene glycol (number-average molecular weight 4000), 2.4kg of nano calcium carbonate, 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 ammonia 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 vinyltrimethoxysilane, 20g of bis [3- (trimethoxysilyl) propyl ] ethylenediamine and 100g N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, 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 high-strength silane modified block polyether elastic sealant.
Note: the structural formula of the dimethoxy methyl propyl silane end-capped block polyether prepolymer in the step 1) is as follows:
Figure GDA0002570470780000061
example 2:
a high-strength silane modified block polyether elastic sealant is prepared by the following steps:
1) 2kg of trimethoxypropylsilane-terminated block polyether prepolymer (number-average molecular weight 12000), 400g of polypropylene glycol (number-average molecular weight 3000), 2kg of nano calcium carbonate, 200g of 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 ammonia light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary stirrer, and heating the materialsStirring for 2.5 hours in vacuum at 100-110 ℃;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding 30g of vinyltrimethoxysilane, 40g of bis [3- (trimethoxysilyl) propyl ] ethylenediamine and 80g N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, and continuing to stir in vacuum for 30 min;
3) and adding 20g of dibutyltin dilaurate, and stirring for 40min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
Note: the structural formula of the trimethoxy propyl silane end-capped block polyether prepolymer in the step 1) is as follows:
Figure GDA0002570470780000062
example 3:
a high-strength silane modified block polyether elastic sealant is prepared by the following steps:
1) 2kg of triethoxymethylsilane-terminated block polyether prepolymer (number average molecular weight 16000), 600g of polypropylene glycol (number average molecular weight 2000), 1.8kg of nano calcium carbonate, 160g of hydrophobic fumed silica (specific surface area 200 m)2Adding 10g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 8g of hindered ammonia light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary mixer, 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 ℃, 20g of vinyl trimethoxy silane and 60g of vinyl trimethoxy silane are added
Figure GDA0002570470780000071
And 60g N- (. beta. -aminoethyl) -gamma. -aminopropyltrimethoxysilane, and stirring under vacuum for 30 min;
3) adding 3g of stannous octoate, and stirring for 30min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
Note: the structural formula of the triethoxymethylsilane-terminated block polyether prepolymer described in step 1) is as follows:
Figure GDA0002570470780000072
example 4:
a high-strength silane modified block polyether elastic sealant is prepared by the following steps:
1) 2kg of trimethoxymethylsilane-terminated block polyether prepolymer (number-average molecular weight 21000), 800g of polypropylene glycol (number-average molecular weight 2000), 1.6kg of nano calcium carbonate, 100g of hydrophobic fumed silica (specific surface area 130 m)2Adding 20g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 2g of hindered ammonia light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary mixer, 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 vinyl trimethoxy silane, 80g of bis [3- (trimethoxysilyl) propyl ] ethylenediamine and 60g N- (beta-aminoethyl) -gamma-aminopropyl triethoxysilane, and continuing to stir in vacuum for 30 min;
3) adding 2g of stannous octoate, and stirring for 30min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
Note: the structural formula of the trimethoxy methyl silane end-capped block polyether prepolymer in the step 1) is as follows:
Figure GDA0002570470780000073
example 5:
a high-strength silane modified block polyether elastic sealant is prepared by the following steps:
1) 2kg of trimethoxymethylsilane-terminated block polyether prepolymer (number average molecular weight 30000), 800g of polypropylene glycol (number average molecular weight 1000), 1.2kg of nano calcium carbonate, 100g of hydrophobic fumed silica (specific surface area 100 m)2Per g), 10g of UV absorber UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 10g of hindered aminesAdding 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, 100g of bis [3- (trimethoxysilyl) propyl ] ethylenediamine and 20g N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, and continuing to stir in vacuum for 25 min;
3) adding 3g of stannous octoate, and stirring for 30min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
Note: the structural formula of the trimethoxy methyl silane end-capped block polyether prepolymer in the step 1) is as follows:
Figure GDA0002570470780000081
comparative example:
the preparation method of the polyether sealant comprises the following steps:
1) 2kg of a dimethoxymethylpropyl-terminated polyether prepolymer (MS-S203H, Brillouin chemical Co., Ltd., Japan, number average molecular weight: 8000 or more), 200g of polypropylene glycol (number average molecular weight: 4000), 2.4kg of nano calcium carbonate, and 240g of hydrophobic fumed silica (specific surface area: 300 m)2Adding 10g of ultraviolet absorbent UV-327(2- (2 ' -hydroxy-3 ', 5 ' -di-tert-butylphenyl) -5-chlorobenzotriazole) and 10g of hindered ammonia light stabilizer Tinuvin770 (bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate) into a planetary mixer, 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 260g 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 polyether sealant.
Test example:
the sealants in examples 1-5 and comparative examples were prepared into standard sample strips, cured for 7 days at 25 ℃ and 50% relative humidity, and then subjected to performance tests, the test results are shown in the following table:
TABLE 1 Performance test results for sealants of examples 1-5 and comparative examples
Figure GDA0002570470780000082
Figure GDA0002570470780000091
Note: the tensile strength and the elongation at break are tested according to the national standard 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 high-strength silane modified block polyether elastic sealant is characterized in that: the composite material is prepared from the following raw materials in parts by mass:
silane-terminated block polyether prepolymer: 100 parts of (A);
plasticizer: 10-40 parts;
nano calcium carbonate: 60-120 parts;
white carbon black: 5-12 parts of a solvent;
water removal agent: 1-3 parts;
ultraviolet absorber: 0.1-1 part;
light stabilizer: 0.1-1 part;
vulcanizing agent: 1-5 parts;
an adhesion promoter: 1-5 parts;
catalyst: 0.1-1 part;
the general structural formula of the end silane block polyether prepolymer is as follows:
Figure FDA0002570470770000011
wherein R is1Is composed of
Figure FDA0002570470770000012
or-OCH2CH2CH2-；
R2is-OCH2O-、-OCH2CH2O-、-OCO(CH2)1～8CH2O-、
Figure FDA0002570470770000013
Figure FDA0002570470770000014
One of (1);
R3is-CH2CH2CH2CH2O-；
R4Is composed of
Figure FDA0002570470770000015
R5Is C1～C5One of alkyl, methoxy and ethoxy;
R6is methyl or ethyl;
m is an integer of 17 to 138;
n is an integer of 13-110;
z is an integer of 1-20;
the number average molecular weight of the silyl-terminated block polyether prepolymer is 6000-40000;
the vulcanizing agent is bis (3-trimethoxysilylpropyl) amine or bis [3- (trimethoxysilyl) propyl]Ethylene diamine,
Figure FDA0002570470770000021
Figure FDA0002570470770000022
At least one of themIn the formula, R is methyl or ethyl.
2. The high strength silane modified block polyether elastomeric sealant of claim 1, wherein: the plasticizer is polypropylene glycol with the number average molecular weight of 1000-6000.
3. The high strength silane modified block polyether elastomeric sealant of 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 100-400 m2/g。
4. The high strength silane modified block polyether elastomeric sealant of claim 1, wherein: the water removal agent is at least one of oxazolidines, hexamethyldisilazane, vinyl trimethoxy silane and vinyl triethoxy silane.
5. The high strength silane modified block polyether elastomeric sealant of claim 1, wherein: the ultraviolet absorbent is at least one of benzotriazoles, benzophenones, salicylates, substituted acrylonitrile and triazines; the light stabilizer is a hindered amine light stabilizer.
6. The high strength silane modified block polyether elastomeric sealant of claim 1, wherein: the adhesion promoter is at least one of amino siloxane, mercapto siloxane and epoxy siloxane.
7. The high strength silane modified block polyether elastomeric sealant of claim 1, wherein: the catalyst is at least one of stannous octoate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin didodecyl sulfide and isooctyl dimercaptoacetate dimethyl tin.
8. The preparation method of the high-strength silane modified block polyether elastic sealant as claimed in any one of claims 1 to 7, is characterized in that: the method comprises the following steps:
1) adding the silyl-terminated block polyether prepolymer, the plasticizer, the nano calcium carbonate, the white carbon black, the ultraviolet absorbent and the light stabilizer into a stirrer, and stirring for 2-3 hours in vacuum;
2) when the temperature of the mixed material in the step 1) is reduced to below 50 ℃, adding a water removing agent, a vulcanizing agent and an adhesion promoter, and continuing to stir in vacuum for 20-40 min;
3) adding a catalyst, and stirring for 20-40 min in vacuum to obtain the high-strength silane modified block polyether elastic sealant.
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