CN119592261A

CN119592261A - A sealant composition and its application in insulating glass

Info

Publication number: CN119592261A
Application number: CN202311152036.7A
Authority: CN
Inventors: 杨建春; 岳林林
Original assignee: Beijing Nuowei New Material Technology Co ltd
Current assignee: Beijing Nuowei New Material Technology Co ltd
Priority date: 2023-09-07
Filing date: 2023-09-07
Publication date: 2025-03-11

Abstract

本发明公开一种密封剂用组合物及其在绝热玻璃中的应用。本发明的密封剂用组合物至少包含：硅烷化(对甲基)苯乙烯‑异丁烯共聚物5‑80wt％；热塑性弹性体1‑75wt％；和增粘剂5‑60wt％。本发明的密封剂用组合物用于制造隔热玻璃组件和太阳能光伏时，不仅可以粘结玻璃及其中间间隔物，形成密封的中空腔室，还可以提供粘结并阻隔中空腔室内的气体离开中空腔室。The present invention discloses a sealant composition and its application in insulating glass. The sealant composition of the present invention comprises at least: 5-80wt% of silylated (p-methyl) styrene-isobutylene copolymer; 1-75wt% of thermoplastic elastomer; and 5-60wt% of tackifier. When the sealant composition of the present invention is used to manufacture insulating glass components and solar photovoltaic, it can not only bond glass and its intermediate spacer to form a sealed hollow chamber, but also provide bonding and block the gas in the hollow chamber from leaving the hollow chamber.

Description

Composition for sealant and application of composition in heat-insulating glass

Technical Field

The invention belongs to the technical field of heat-insulating glass, and relates to a composition for a sealant and application of the composition in heat-insulating glass.

Background

Hollow glass assemblies typically include a pair of glass sheets held at a fixed distance from each other by a spacer structure (spacer) and a sealing structure that extends around the inner surfaces of the glass sheets to define a sealed and thermally insulating space between the glass sheets. In an insulated window sash assembly, the spacer is an integral part of the window sash frame and the glass pane is attached to the spacer by a sealant or adhesive composition. A sealant or adhesive composition may also be used to encapsulate the edges of the insulating glass unit to provide a barrier against moisture penetration into the interior of the unit and to prevent insulating gases (e.g., argon) from exiting the chamber.

Chemically cured thermosetting compositions and hot melt butyl compositions are two types of sealants commonly used in the hollow glass industry. Chemical curing systems include liquid polysulfide rubber, polyurethane, thiol-modified polyether polyurethane, and two-component silicones. Hot melt butyl polymers are also known as "cure-free systems" sealants.

Thermoset compositions are typically two-component systems, with the components only being mixed at room temperature at the time of use. There is slow curing which increases the difficulty and expense of production. Hot melt butyl type compositions generally set faster but are greatly affected by ambient temperature, tend to soften at high temperatures, harden at low temperatures, and have a weak final bond.

Other sealant compositions have been developed that include one-part sealants such as thermoplastic hot melt adhesives and air-curable resins that polymerize when exposed to ambient atmosphere. Such sealants create tension when present to bond two different substrates.

The sealant for hollow glass is required to have proper coating viscosity of a substrate during manufacturing, facilitate coating and provide certain initial bonding strength, and also is required to have good bonding strength and air tightness of finished products. Hollow glass manufacturing has a strong need for such suitable sealants.

Disclosure of Invention

In order to solve the technical problems, the invention provides the following technical scheme:

a composition for a sealant, the composition comprising at least:

5 to 80wt% of a silylated (p-methyl) styrene-isobutylene copolymer;

1 to 75% by weight of a thermoplastic elastomer, and

5-60Wt% of tackifier.

According to an embodiment of the present invention, the silane group grafting ratio in the silylated (p-methyl) styrene-isobutylene copolymer is 0.1 to 20mol%. In the present invention, the grafting ratio refers to the number of moles of silane groups per 100 moles of copolymer molecules. Specifically, the grafting ratio is, for example, 1mol%, 2mol%, 3mol%, 4mol%, 5mol%, 6mol%, 7mol%, 8mol%, 9mol%, 10mol%, 15mol%.

According to an embodiment of the present invention, the silylated (p-methyl) styrene-isobutylene copolymer has moisture-curability, i.e., the silylated (p-methyl) styrene-isobutylene copolymer is crosslinked after the silane groups in the silylated (p-methyl) styrene-isobutylene copolymer react with water during practical use, particularly when used as a sealant for insulating glass, thereby increasing the adhesiveness and air tightness of the sealant.

According to an embodiment of the present invention, the silylated (p-methyl) styrene-isobutylene copolymer is selected from at least one of the reactants of (p-methyl) styrene-isobutylene copolymer and silane of the general formula RR' SiY ₂;

In the general formula RR' SiY ₂ of the silane, R is selected from monovalent olefinically unsaturated hydrocarbon or hydrocarbyloxy groups which can react with free radical sites generated on the backbone of the isobutylene copolymer;

R' is selected from alkyl, aryl or Y;

y is selected from hydrolyzable organic groups.

According to an embodiment of the invention, R may be selected from vinyl, allyl, butenyl, 4-pentenyl, 5-hexenyl, cyclohexenyl or cyclopentadienyl groups, preferably R is selected from vinyl.

According to an embodiment of the present invention, Y may be selected from at least one or two or more of an alkoxy group (for example, may be selected from a C ₁-C₄ alkoxy group), an acyloxy group, an oxime group (oximo), and a substituted amino group. Further, the C ₁-C₄ alkoxy group is, for example, at least one or two or more selected from methoxy, ethoxy and butoxy groups. Further, the acyloxy group is selected from, for example, formyloxy, acetoxy, or propionyloxy. Further, the oxime group (oximo) is selected, for example, from-on=c (CH ₃)₂、-ON＝C(CH₃)(C₂H₅) and-on=c (C ₆H₅)₂. Further, the substituted amino group is selected, for example, from alkylamino or arylamino groups, such as-NHCH ₃、-NHC₂H₅, and-NHC ₆H₅.

According to an embodiment of the invention, in the general formula, R' represents alkyl, aryl or Y. Illustratively, R' is selected from methyl, ethyl, propyl, butyl, phenyl, alkylphenyl, or Y. Further, R' is preferably methyl or alkoxy. Specifically, the alkoxy group may be selected from C ₁-C₄ alkoxy groups, and further, the C ₁-C₄ alkoxy group is selected from at least one or two or more of methoxy, ethoxy and butoxy groups.

According to a preferred embodiment of the invention, in the general formula of the silane, R is selected from vinyl groups, R' is selected from methyl groups or Y groups, Y is selected from alkoxy groups (such as ethoxy or methoxy groups).

According to a preferred embodiment of the invention, the silane is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane and methylvinyldimethoxysilane, for example.

According to an embodiment of the present invention, the number average molecular weight of the silylated (p-methyl) styrene-isobutylene copolymer is 2000-1000000, preferably 10000-500000, more preferably 10000-50000, for example 10000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000.

According to an embodiment of the present invention, the content of the silylated (p-methyl) styrene-isobutylene copolymer in the composition is, for example, 10wt%, 20wt%, 30wt%, 40wt%, 50wt%, 60wt%, 70wt%.

According to an embodiment of the invention, the composition further comprises 5-50wt%, such as 10wt%, 20wt%, 30wt%, 40wt% of amorphous poly-alpha-olefin.

According to embodiments of the present invention, the amorphous polyalphaolefin refers to amorphous homopolymers and/or copolymers of monomers such as ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3-ethyl-1-pentene, 1-octene, 1-decene, 1-undecene, and the like. Preferably, the amorphous polyalphaolefin is selected from at least one of atactic polypropylene, propylene/ethylene amorphous copolymer, propylene/1-butene amorphous copolymer, ethylene/propylene/1-butene ternary amorphous copolymer. Also exemplary, the amorphous polyalphaolefin is selected from ethylene/propylene/1-butene terpolymers (APAO), such as APAO obtained by catalytic copolymerization of a mixed monomer of 10-15wt% ethylene, 55-60 wt% propylene and 25-30wt% 1-butene.

According to an embodiment of the invention, the amorphous polyalphaolefin has a number average molecular weight of 5000-100000, for example 6000, 10000, 19000, 50000, 80000, 90000.

Illustratively, the amorphous polyalphaolefin is preferably an ethylene/propylene/1-butene ternary amorphous copolymer (APAO), such as vesoproplast 508 (winning).

According to an embodiment of the present invention, the content of the amorphous poly-alpha-olefin in the composition is, for example, 10wt%, 20wt%, 30wt%, 40wt%, 50wt%.

According to an embodiment of the present invention, the thermoplastic elastomer is selected from at least one of polyisobutylene, isobutylene copolymer, ethylene propylene rubber, butadiene and styrene block copolymer, isoprene and styrene block copolymer, ethylene vinyl acetate, atactic polypropylene, ethylene (meth) acrylate copolymer, etc., preferably isobutylene copolymer.

According to an embodiment of the present invention, the molar content of (p-methyl) styrene in the (p-methyl) styrene-isobutylene copolymer is not more than 20mol%, preferably 0.1 to 20mol%, for example, 0.5mol%, 1mol%, 2mol%, 3mol%, 4mol%, 5mol%, 6mol%, 7mol%, 8mol%, 9mol%, 10mol%, 15mol%.

According to an embodiment of the invention, the thermoplastic elastomer has a number average molecular weight of 2000 to 1000000, for example 5000、10000、20000、30000、40000、50000、60000、70000、80000、90000、100000、200000、300000、400000、500000、600000、700000、800000、900000.

According to an embodiment of the present invention, the thermoplastic elastomer is present in the composition in an amount of, for example, 10wt%, 20wt%, 30wt%, 40wt%, 50wt%, 60wt%, 70wt%.

According to an embodiment of the present invention, the tackifier is at least one selected from the group consisting of a carbon penta petroleum resin, an α -methylstyrene resin, a carbon nona petroleum resin, an aliphatically modified aromatic carbon nona petroleum resin, a phenol modified aromatic resin, and a resin of a carbon nona aromatic/aliphatic olefin derivative.

According to an embodiment of the invention, the adhesion promoter has an average molecular weight of 100-10000, for example 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000.

According to an embodiment of the invention, the softening point of the tackifier is 40-150 ℃, e.g. 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃.

Illustratively, the tackifier is, for example, carbon five petroleum resin (ExxonMobil 1310 LC).

According to an embodiment of the present invention, the tackifier is present in the composition in an amount of, for example, 10wt%, 20wt%, 30wt%, 40wt%, 50wt%.

According to an embodiment of the invention, the composition may further comprise additives.

According to an embodiment of the present invention, the additive is selected from at least one of a filler, a light stabilizer, an antioxidant, a pigment, a flame retardant, and the like.

According to an embodiment of the present invention, the additive may be selected from the additives known in the art, and is not particularly limited in the present invention.

According to an embodiment of the invention, the composition further comprises a crosslinking promoter.

According to an embodiment of the invention, the crosslinking promoter is selected from organotin compounds. Preferably, the organotin compound may be selected from at least one of materials known in the art, such as dialkyltin dicarboxylate (dibutyltin dilaurate), tin carboxylate, stannous carboxylate. Illustratively, the stannous carboxylate is selected from stannous octoate, stannous acetate, preferably stannous octoate.

According to an embodiment of the invention, the crosslinking promoter is present in the composition in an amount of 0.001 to 20wt%, for example 0.01wt%, 0.1wt%, 1wt%, 5wt%, 10wt%, 15wt%.

According to an embodiment of the invention, the viscosity of the composition is 10000-500000 centipoise (150 ℃).

The invention also provides application of the composition for the sealant, which is used for manufacturing insulating glass and solar photovoltaic.

According to embodiments of the present invention, the sealant composition may be applied to a substrate in a manner known in the art, such as in the form of an extruder, hand spray gun, or the like.

According to an embodiment of the invention, the substrate is selected from at least one of glass, polymer, metal, etc., preferably glass.

According to an embodiment of the invention, the sealant composition is applied at a temperature of 60 ℃ to 120 ℃, preferably 70 to 115 ℃, for example 80 ℃, 90 ℃, 100 ℃, 110 ℃.

According to an embodiment of the present invention, the sealant composition has an initial strength of not less than 27kPa, for example, 27 to 50kPa, and for example, 30kPa and 40kPa under coating conditions.

According to an embodiment of the invention, the sealant composition cures upon exposure to conditions of room temperature (10-40 ℃, e.g., 25 ℃) and a relative humidity of 10-90RH% to provide a sealant. Preferably, the relative humidity is, for example, 30RH%, 50RH%, 70RH%.

According to an embodiment of the invention, the sealant has a tensile strength of 420 to 550kPa, e.g. 450kPa, 500kPa, at room temperature (10 to 40 ℃, e.g. 25 ℃).

According to embodiments of the invention, the final lap shear strength of the sealant is 200 to 800kPa, such as 300kPa, 400kPa, 500kPa, 600kPa, 700kPa, within 12 weeks after curing.

According to an embodiment of the invention, the sealant has a shore a hardness of 20-75, such as 30, 40, 50, 60, 70.

According to an embodiment of the present invention, the sealant provides good air tightness. Preferably, the water vapor transmission rate of the sealant (e.g., in the case of a 2mm thick film) is not higher than 2.4g/m ²/day, e.g., preferably 1.0g/m ²/day, 1.5g/m ²/day, 1.9g/m ²/day, 2.0g/m ²/day, 2.1g/m ²/day, 2.2g/m ²/day, 2.3g/m ²/day.

According to embodiments of the invention, the sealant preferably passes the low temperature flexibility test of GB 13477.7 at-30, -20 and-10 ℃.

According to an embodiment of the invention, the sealant passes the 60 ℃ creep resistance test.

According to an embodiment of the invention, the sealant has a failure rate to bond to glass after immersion of less than 50%, preferably less than 5%, for example 40%, 30%, 20%, 10%, 5%, 4%, 3%, 2%, 1%.

Advantageous effects

The composition for the sealant has proper initial viscosity, is convenient to coat, is suitable for connecting glass with substrates such as glass, polymers, metals and the like, realizes good bonding strength and airtightness, and has good solvent resistance, heat resistance and low-temperature characteristics.

When the sealant composition is used for manufacturing heat-insulating glass assemblies and solar photovoltaics, not only can the glass and the intermediate spacers thereof be bonded to form a sealed hollow cavity, but also the sealant composition can be used for bonding and blocking gas in the hollow cavity from leaving the hollow cavity.

Detailed Description

The technical scheme of the invention will be further described in detail below with reference to specific embodiments. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.

Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.

Preparation example 1

Preparation of a para-methylstyrene-isobutylene copolymer:

the yellow polymer prepared in example 1 of the patent document with reference to CN00804495.3 is a silylated para-methylstyrene-isobutylene copolymer.

In the copolymer prepared as described above, the molar content of trimethoxysilyl groups per mole of the copolymer was 2.9mol%, mn=16100, and mw/mn=2.27.

Example 1

The sealant composition was prepared by preheating a mechanical stirring mixer equipped with a vacuum pump to 120℃and adding 100g of butyl rubber (new material collected from Zhejiang, IIR 532), 100g of polyisobutylene (BASF, B12) and stirring for 20min, and then adding 120g of amorphous poly-alpha-olefin (Yingchuang, VESTOPLAST 508) and 120g of tackifying resin (ExxonMobil 1310LC carbon five petroleum resin) and stirring for 15min at 120 ℃. The vacuum pump was turned on and stirring was continued for 30min at 120℃under a pressure of about 10 KPa. 240g of the silylated para-tolueneethylene-isobutylene copolymer of preparation example 1 was added thereto, and stirring was continued for 30 minutes with keeping the temperature. Finally, 0.15g of dibutyltin dilaurate was added, and the mixture was stirred under vacuum for 15 minutes to obtain a sealant composition.

Example 2

Method for preparing a composition for a sealant referring to example 1, each component and its amount are referred to table 1, and a composition for a sealant of example 2 is prepared.

Comparative example 1

The method for producing the sealant composition of this comparative example was as described in example 1, and the respective components and the amounts thereof were as described in table 1, to produce the sealant composition of comparative example 1.

Comparative example 2

This comparative example was basically the same as example 1 except that the silylated para-tolueneethylene-isobutylene copolymer of preparation example 1 was replaced with a silylated amorphous poly-alpha-olefin (winning, VSTOPLAST206,206) to prepare a composition for sealant of this comparative example.

Test case

The test results of lap shear strength, hardness, low temperature flexibility (-10 ℃ C., -20 ℃ C., -30 ℃ C.), glass bonding failure rate, creep resistance and the like were measured by referring to the following test methods, and are recorded in Table 1.

In the test methods described below, room temperature is specifically referred to as 25 ℃ and 50% relative humidity.

Lap shear strength (I)

Lap shear strength was determined with reference to MH/T6099-2013 sealant lap shear strength test method:

(1) The test sample was prepared by preparing a film of 25mm×25mm and 2mm in thickness from the composition for sealant, placing the film on a 100mm×25mm aluminum sheet, placing a 25mm×75mm glass sheet on top of the film, bonding the glass sheet and the aluminum sheet by pressing with force, and then heating at 120 ℃ for 10 minutes to obtain the test sample.

(2) Testing the initial lap shear strength within 1-2min after obtaining the sample;

(3) The final lap shear strength was tested after 12 weeks of test specimen placement.

(II) Water vapor Transmission test

The test was carried out with reference to the cup method in the GB/T1037-2021 plastic film and sheet water vapor permeability test method. The sealant composition was prepared into a film with a thickness of 2mm and heated at 120 ℃ for 10min to obtain a sample, and the permeability coefficient of the sample at 37 ℃ and 90% relative humidity was measured by an infrared sensor method moisture-permeable instrument (LabThink C H) to obtain the water vapor permeability.

(III) hardness

The Shore durometer (Shore A) test was used. Reference is made to the 2mm thick film prepared in method (one) above. Initial hardness was measured after heating at 120 ℃ for 10min, and final hardness was measured after 12 weeks of sample placement.

(IV) Low temperature flexibility test

And the test is referred to GB/T13477.7-2002 test of low-temperature flexibility of the 7 th part of the test method of the building sealing material.

(V) test of failure rate of glass adhesion

A spacer of 50mm by 40mm was placed between two glass sheets of 25mm by 80mm in a jig, the jig was clamped, the two glass sheets formed into a channel due to the spacer spacing, and the above sealant composition was smeared and filled into the channel between the two glass sheets with a spatula to obtain a sample, which was then placed in an oven at 140℃for heating for 10 minutes, taken out and cooled overnight to obtain a glass connector sample.

Glass bonding failure rate of the samples after subjecting the glass connector samples to the following conditions (1) to (3), respectively:

(1) Standing at room temperature for one week;

(2) Immersing in deionized water for one week, taking out, drying (wiping or airing), and testing;

(3) The mixture was left at 60℃for one week at 100% relative humidity.

Creep resistance (six)

(1) The sample preparation method comprises preparing the above sealant composition into films with thickness of 2mm of 25mm×25mm, respectively placing the films on aluminum sheets with thickness of 100mm×25mm, respectively, placing glass sheets with thickness of 25mm×80mm on top of the films, bonding by pressing with force, placing in a 120 deg.C oven, heating for 10min, and standing at room temperature for 4 weeks to obtain the sample.

(2) Test sample one end was suspended with a 500g load and placed in a 60 ℃ oven and the time to failure recorded. The cells were left for 7 days without failure and were considered to pass.

TABLE 1

From the experimental results, the sealant composition of the invention not only has proper initial viscosity and is convenient to coat, but also has excellent wet strength after curing, good water resistance, heat resistance and low temperature characteristics and high bonding capability with a glass substrate. When the glass is used for preparing the heat-insulating glass, not only can stronger cohesive force be provided, but also the gas in the hollow cavity chamber can be prevented from leaving the hollow cavity chamber.

The above description of exemplary embodiments of the application has been provided. The scope of the application is not limited to the embodiments described above. Any modifications, equivalent substitutions, improvements, or the like, which are within the spirit and principles of the present application, should be made by those skilled in the art, and are intended to be included within the scope of the present application.

Claims

1. A sealant composition, characterized in that the composition at least comprises:

Silylated (p-methyl) styrene-isobutylene copolymer 5-80wt%;

Thermoplastic elastomer 1-75wt%; and

Tackifier 5-60wt%.

2. The composition according to claim 1, characterized in that the composition further contains 5-50 wt% of amorphous poly-α-olefin.

Preferably, the grafting rate of silane groups in the silylated (p-methyl)styrene-isobutylene copolymer is 0.1 to 20 mol%.

Preferably, the silylated (p-methyl)styrene-isobutylene copolymer is moisture curable.

Preferably, the silylated (p-methyl)styrene-isobutylene copolymer is selected from at least one of an isobutylene copolymer and a reactant of a silane of the general formula RR′SiY ₂ ;

In the general formula of the silane RR′SiY ₂ , R is selected from a monovalent olefinic unsaturated hydrocarbon or a hydrocarbyloxy group that can react with a free radical point generated on the main chain of the isobutylene copolymer; when R is selected from a hydrocarbyloxy group, it is not hydrolyzable;

R′ is selected from alkyl, aryl or Y;

Y is selected from hydrolyzable organic groups.

3. The composition according to claim 1 or 2, characterized in that in the general formula, R is selected from vinyl, allyl, butenyl, 4-pentenyl, 5-hexenyl, cyclohexenyl or cyclopentadienyl.

Preferably, in the general formula, Y is selected from at least one or two or more of an alkoxy group, an acyloxy group, an oximo group, and a substituted amino group.

Preferably, in the general formula, R′ represents an alkyl group, an aryl group or Y.

Preferably, in the general formula of the silane, R is selected from vinyl, R' is selected from methyl or Y group, and Y is selected from alkoxy.

Preferably, the silane is selected from at least one of vinyltriethoxysilane, vinyltrimethoxysilane and methylvinyldimethoxysilane.

Preferably, the number average molecular weight of the silylated (p-methyl)styrene-isobutylene copolymer is 2,000-1,000,000.

4. The composition according to any one of claims 1 to 3, characterized in that the amorphous poly-α-olefin refers to an amorphous homopolymer and/or copolymer of monomers such as ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3-ethyl-1-pentene, 1-octene, 1-decene, 1-undecene, etc. Preferably, the amorphous poly-α-olefin is selected from at least one of random polypropylene, propylene/ethylene amorphous copolymer, propylene/1-butene amorphous copolymer, and ethylene/propylene/1-butene terpolymer.

Preferably, the number average molecular weight of the amorphous poly-α-olefin is 5,000-100,000.

5. The composition according to any one of claims 1 to 4, characterized in that the thermoplastic elastomer is selected from at least one of polyisobutylene, isobutylene copolymers, ethylene-propylene rubber, butadiene-styrene block copolymers, isoprene-styrene block copolymers, ethylene vinyl acetate, random polypropylene, and ethylene acrylate (methyl) copolymers.

Preferably, in the (p-methyl)styrene-isobutylene copolymer, the molar content of (p-methyl)styrene is not more than 20 mol %.

Preferably, the number average molecular weight of the thermoplastic elastomer is 2,000 to 1,000,000.

6. The composition according to any one of claims 1 to 5, characterized in that the tackifier is selected from at least one of C5 petroleum resins, α-methylstyrene resins, C9 petroleum resins, aliphatic-modified aromatic C9 petroleum resins, phenol-modified aromatic resins, and C9 aromatic/aliphatic olefin derivative resins.

Preferably, the average molecular weight of the tackifier is 100-10000.

Preferably, the softening point of the tackifier is 40-150°C.

7. The composition according to any one of claims 1 to 6, characterized in that the composition further comprises an additive.

Preferably, the additive is selected from at least one of a filler, a light stabilizer, an antioxidant, a pigment, and a flame retardant.

Preferably, the composition further comprises a cross-linking accelerator.

Preferably, the cross-linking accelerator is selected from organotin compounds.

Preferably, in the composition, the content of the cross-linking accelerator is 0.001-20 wt %.

Preferably, the viscosity of the composition is 10,000-500,000 centipoise.

8. Use of the sealant composition according to any one of claims 1 to 7 for manufacturing heat-insulating glass and solar photovoltaic.

9. The use according to claim 8, characterized in that the sealant composition is applied to a substrate.

Preferably, the substrate is selected from at least one of glass, polymer and metal.

Preferably, when the sealant composition is applied, the coating temperature is 60°C-120°C.

Preferably, the sealant composition has an initial strength of not less than 27 kPa under coating conditions.

Preferably, the sealant composition is cured to obtain a sealant when exposed to room temperature and a relative humidity of 10-90 RH%.

10. The use according to claim 8 or 9, characterized in that the tensile strength of the sealant at room temperature is 420-550 kPa.

Preferably, the sealant has a final lap shear strength of 200-800 kPa within 12 weeks after curing.

Preferably, the sealant has a Shore A hardness of 20-75.

Preferably, the sealant provides good airtightness.

Preferably, the sealant passes the low temperature flexibility test of GB 13477.7 at -30°C, -20°C and -10°C.

Preferably, the sealant passes a 60°C creep resistance test.

Preferably, after the sealant is immersed in water, the glass bonding failure rate is less than 50%.