CN109251714A - A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass and preparation method thereof - Google Patents
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass and preparation method thereof Download PDFInfo
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- CN109251714A CN109251714A CN201810936193.XA CN201810936193A CN109251714A CN 109251714 A CN109251714 A CN 109251714A CN 201810936193 A CN201810936193 A CN 201810936193A CN 109251714 A CN109251714 A CN 109251714A
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
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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
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, it is mixed by component A and B component, the weight ratio of the component A and B component is (10-15): 1, wherein, the component A is made of the raw material of following parts by weight: 150-250 parts of end capped polyether, 250-300 parts of plasticizer, 400-550 parts of filler, 2-5 parts of coupling agent；The B component is made of the raw material of following parts by weight: 150-200 parts of polyether polyol, 80-160 parts of pigment, 40-100 parts of curing agent, 2-5 parts of catalyst.Sealant gas leakage prevention ability of the present invention is strong, water vapor penetrating power is good, anti-uv-ray is strong and the intensity of glue, elasticity capacity, cementability are good, easily operated.
Description
Technical field
The present invention relates to Polyurethane Sealant for Laminated Glass technical field more particularly to a kind of high-strength bi-component polyurethane
Insulating glass sealant and preparation method thereof.
Background technique
Polyurethane sealant (polyurethanesealant) system with polyurethane rubber and base polyurethane prepolymer for use as be mainly at
The sealant divided.Such sealant has high tensile strength, excellent elasticity, wearability, oil resistivity and cold resistance, but water-fast
Property, it is especially alkaline-resisting aqueous not good enough.Heating vulcanization type, room temperature vulcanized and three kinds of heat molten type can be divided into.Wherein room temperature vulcanized
It is divided into one pack system and bi-component again.It is widely used in building, square, highway as inlay sealing material and automobile system
It makes, glass installation, the sealing of electronic filling, submarine and rocket etc., Polyurethane Sealant for Laminated Glass is in polyurethane sealant
Important branch, polyurethane hollow glass belongs to the polyurethone sealant of the bi-component of room temperature vulcanized.It is mainly used as hollow
The second of glass seals, and hence obtain one's name Polyurethane Sealant for Laminated Glass.With Polyurethane Sealant for Laminated Glass phase same-action
There are also hollow glass silicone sealant and polysulfide insulating glass sealant.They are all the second sealants of hollow glass.
Raising to polyurethane hollow glass intensity and service performance is our problems faceds, to push polyurethane hollow glass
The technology of sealant develops.
Summary of the invention
The purpose of the present invention is to solve disadvantages existing in the prior art, and a kind of high-strength bi-component proposed is poly-
Urethane insulating glass sealant and preparation method thereof.
To achieve the goals above, present invention employs following technical solutions:
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, the component A and B
The weight ratio of component is (10-15): 1, wherein the component A is made of the raw material of following parts by weight: end capped polyether 150-250
Part, 250-300 parts of plasticizer, 400-550 parts of filler, 2-5 parts of coupling agent；The B component is made of the raw material of following parts by weight:
150-200 parts of polyether polyol, 80-160 parts of pigment, 40-100 parts of curing agent, 2-5 parts of catalyst.
Preferably, the optimum weight ratio of the component A and B component is 12:1.
Preferably, the end capped polyether virgin rubber viscosity is 20000-40000PaS.
Preferably, the plasticizer viscosity is the dibutyl phthalate of 100-500PaS.
Preferably, the filler is nm-class active calcium carbonate, activated Calcium carbonate, active coarse whiting, silicon powder and talcum powder
At least one, and filler optimum combination is the combination of 250-300 parts of nm-class active calcium carbonate with 150-250 parts of activated Calcium carbonate,
And nm-class active calcium carbonate partial size is 15-40 nanometers.
Preferably, the curing agent is low molecular weight polyamide, cycloaliphatic polyisocyanate and two-component curing agent
It is at least one.
Preferably, the catalyst is at least one of amines catalyst, organo-metallic catalyst, organo-bismuth, organic zinc.
Preferably, the coupling agent is aminopropyl triethoxysilane, propyl trimethoxy silicane and aminopropyl trimethoxy
At least one of base silane.
Preferably, the pigment is carbon black or white carbon black.
The present invention also provides a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass, including it is as follows
Step:
The preparation of S1:A component, the end capped polyether for being 20000-40000PaS by viscosity, viscosity are the neighbour of 100-500PaS
Dibatyl phithalate, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 50 DEG C -80 DEG C in temperature, vacuum degree
For -0.07Mpa~-0.1Mpa, revolving speed disperses 1-3 hours under the conditions of being 500-600rpm, and component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.07Mpa~-0.1Mpa in vacuum degree, stirring 2-3 is small under the conditions of 40-80 DEG C
When, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass.
Compared with prior art the invention has the benefit that sealant gas leakage prevention ability of the present invention is strong, water vapor
Penetrating power is good, anti-uv-ray is strong and the intensity of glue, elasticity capacity, cementability are good, easily operated.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Embodiment 1
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, the component A and B
The weight ratio of component is 12:1, wherein the component A is made of the raw material of following parts by weight: 150 parts of end capped polyether, plasticizer
250 parts, 400 parts of filler, 2 parts of coupling agent；The B component is made of the raw material of following parts by weight: 150 parts of polyether polyol, face
80 parts, 40 parts of curing agent, 2 parts of catalyst of material.
Specifically, the end capped polyether virgin rubber viscosity is 20000PaS.
Specifically, the plasticizer viscosity is the dibutyl phthalate of 100PaS.
Specifically, the filler is nm-class active calcium carbonate and activated Calcium carbonate, and nm-class active calcium carbonate is 250 parts,
Activated Calcium carbonate is 150 parts, and nm-class active calcium carbonate partial size is 15 nanometers.
Specifically, the curing agent is low molecular weight polyamide.
Specifically, the catalyst is amines catalyst.
Specifically, the coupling agent is aminopropyl triethoxysilane.
Specifically, the pigment is carbon black.
The present invention also provides a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass, including it is as follows
Step:
The preparation of S1:A component, the end capped polyether for being 20000PaS by viscosity, viscosity are the phthalic acid two of 100PaS
Butyl ester, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 50 DEG C in temperature, vacuum degree is -0.07Mpa, revolving speed
To disperse 1 hour under the conditions of 500rpm, component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.07Mpa in vacuum degree, stirs 2 hours under the conditions of 40 DEG C, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass.
Embodiment 2
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, the component A and B
The weight ratio of component is 11:1, wherein the component A is made of the raw material of following parts by weight: 200 parts of end capped polyether, plasticizer
260 parts, 450 parts of filler, 3 parts of coupling agent；The B component is made of the raw material of following parts by weight: 160 parts of polyether polyol, face
100 parts, 60 parts of curing agent, 3 parts of catalyst of material.
Specifically, the end capped polyether virgin rubber viscosity is 25000PaS.
Specifically, the plasticizer viscosity is the dibutyl phthalate of 200PaS.
Specifically, the filler is nm-class active calcium carbonate and activated Calcium carbonate, and nm-class active calcium carbonate is 250 parts,
Activated Calcium carbonate is 200 parts, and nm-class active calcium carbonate partial size is 20 nanometers.
Specifically, the curing agent is low molecular weight polyamide and cycloaliphatic polyisocyanate.
Specifically, the catalyst is amines catalyst and organo-metallic catalyst.
Specifically, the coupling agent is aminopropyl triethoxysilane and propyl trimethoxy silicane.
Specifically, the pigment is carbon black.
The present invention also provides a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass, including it is as follows
Step:
The preparation of S1:A component, the end capped polyether for being 30000PaS by viscosity, viscosity are the phthalic acid two of 200PaS
Butyl ester, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 60 DEG C in temperature, vacuum degree is -0.08Mpa, revolving speed
To disperse 1.5 hours under the conditions of 540rpm, component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.08Mpa in vacuum degree, stirs 2.5 hours under the conditions of 50 DEG C, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass.
Embodiment 3
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, the component A and B
The weight ratio of component is 13:1, wherein the component A is made of the raw material of following parts by weight: 220 parts of end capped polyether, plasticizer
280 parts, 500 parts of filler, 4 parts of coupling agent；The B component is made of the raw material of following parts by weight: 180 parts of polyether polyol, face
120 parts, 80 parts of curing agent, 4 parts of catalyst of material.
Specifically, the end capped polyether virgin rubber viscosity is 35000PaS.
Specifically, the plasticizer viscosity is the dibutyl phthalate of 400PaS.
Specifically, the filler is nm-class active calcium carbonate and activated Calcium carbonate, and nm-class active calcium carbonate is 300 parts,
Activated Calcium carbonate is 200 parts, and nm-class active calcium carbonate partial size is 30 nanometers.
Specifically, the curing agent is cycloaliphatic polyisocyanate.
Specifically, the catalyst is organo-bismuth and organic zinc.
Specifically, the coupling agent is aminopropyl trimethoxysilane.
Specifically, the pigment is white carbon black.
The present invention also provides a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass, including it is as follows
Step:
The preparation of S1:A component, the end capped polyether for being 30000PaS by viscosity, viscosity are the phthalic acid two of 400PaS
Butyl ester, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 70 DEG C in temperature, vacuum degree is -0.09Mpa, revolving speed
To disperse 3 hours under the conditions of 580rpm, component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.09Mpa in vacuum degree, stirs 3 hours under the conditions of 70 DEG C, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass.
Embodiment 4
A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, the component A and B
The weight ratio of component is 15:1, wherein the component A is made of the raw material of following parts by weight: 250 parts of end capped polyether, plasticizer
300 parts, 550 parts of filler, 5 parts of coupling agent；The B component is made of the raw material of following parts by weight: 200 parts of polyether polyol, face
160 parts, 100 parts of curing agent, 5 parts of catalyst of material.
Specifically, the end capped polyether virgin rubber viscosity is 40000PaS.
Specifically, the plasticizer viscosity is the dibutyl phthalate of 500PaS.
Specifically, the filler is nm-class active calcium carbonate and activated Calcium carbonate, and nm-class active calcium carbonate is 300 parts,
Activated Calcium carbonate is 250 parts, and nm-class active calcium carbonate partial size is 40 nanometers.
Specifically, the curing agent is low molecular weight polyamide.
Specifically, the catalyst is organo-metallic catalyst.
Specifically, the coupling agent is aminopropyl triethoxysilane.
Specifically, the pigment is white carbon black.
The present invention also provides a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass, including it is as follows
Step:
The preparation of S1:A component, the end capped polyether for being 40000PaS by viscosity, viscosity are the phthalic acid two of 500PaS
Butyl ester, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 80 DEG C in temperature, vacuum degree is -0.1Mpa, revolving speed
To disperse 3 hours under the conditions of 600rpm, component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.1Mpa in vacuum degree, stirs 3 hours under the conditions of 80 DEG C, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass
Sealant gas leakage prevention ability of the present invention is strong, water vapor penetrating power is good, anti-uv-ray is strong and the intensity of glue,
Elasticity capacity, cementability are good, easily operated.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass, is mixed by component A and B component, it is characterised in that:
The weight ratio of the component A and B component is (10-15): 1, wherein the component A is made of the raw material of following parts by weight: sealing end
150-250 parts of polyethers, 250-300 parts of plasticizer, 400-550 parts of filler, 2-5 parts of coupling agent；The B component is by following parts by weight
Raw material composition: 150-200 parts of polyether polyol, 80-160 parts of pigment, 40-100 parts of curing agent, 2-5 parts of catalyst.
2. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
The optimum weight ratio of component A and B component is 12:1.
3. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
End capped polyether virgin rubber viscosity is 20000-40000PaS.
4. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Plasticizer viscosity is the dibutyl phthalate of 100-500PaS.
5. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Filler is at least one of nm-class active calcium carbonate, activated Calcium carbonate, active coarse whiting, silicon powder and talcum powder, and filler is optimal
Combination is the combination of 250-300 parts of nm-class active calcium carbonate with 150-250 parts of activated Calcium carbonate, and nm-class active calcium carbonate partial size
It is 15-40 nanometers.
6. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Curing agent is at least one of low molecular weight polyamide, cycloaliphatic polyisocyanate and two-component curing agent.
7. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Catalyst is at least one of amines catalyst, organo-metallic catalyst, organo-bismuth, organic zinc.
8. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Coupling agent is at least one of aminopropyl triethoxysilane, propyl trimethoxy silicane and aminopropyl trimethoxysilane.
9. a kind of high-strength bi-component Polyurethane Sealant for Laminated Glass according to claim 1, it is characterised in that: described
Pigment is carbon black or white carbon black.
10. a kind of preparation method of high-strength bi-component Polyurethane Sealant for Laminated Glass described in claim 1, feature exist
In: include the following steps:
The preparation of S1:A component, the end capped polyether for being 20000-40000PaS by viscosity, viscosity are the neighbour of 100-500PaS
Dibatyl phithalate, nm-class active calcium carbonate, activated Calcium carbonate are added in dispersion machine, are 50 DEG C -80 DEG C in temperature, vacuum degree
For -0.07Mpa~-0.1Mpa, revolving speed disperses 1-3 hours under the conditions of being 500-600rpm, and component A is made；
The pure and mild pigment of polyether polyols is uniformly mixed by the preparation of S2:B component, and base pigment is made, then by curing agent, catalysis
High speed disperser is added in agent, base pigment, is -0.07Mpa~-0.1Mpa in vacuum degree, stirring 2-3 is small under the conditions of 40-80 DEG C
When, B component is made；
S3: component A obtained and B component are mixed in proportion to get high-strength bi-component Polyurethane Sealant for Laminated Glass.
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| CN201810936193.XA CN109251714A (en) | 2018-08-16 | 2018-08-16 | A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass and preparation method thereof |
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| CN201810936193.XA CN109251714A (en) | 2018-08-16 | 2018-08-16 | A kind of high-strength bi-component Polyurethane Sealant for Laminated Glass and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110055024A (en) * | 2019-05-10 | 2019-07-26 | 无锡市万力粘合材料股份有限公司 | Hollow glass warms up side spacer bar polyurethane hot melt adhesive composite and preparation method thereof |
| CN111892900A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | High-elasticity two-component polyurethane sealant and preparation method thereof |
| CN111892901A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Fast-curing two-component polyurethane sealant for hollow glass and preparation method thereof |
| CN111892898A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Anti-ultraviolet-aging two-component polyurethane hollow glass sealant and preparation method thereof |
| CN111892899A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Low-temperature easily-extruded double-component polyurethane hollow glass sealant and preparation method thereof |
| CN116948589A (en) * | 2023-09-20 | 2023-10-27 | 山东一诺威新材料有限公司 | Sealed high-modulus hollow glass edge sealing adhesive and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892900A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | High-elasticity two-component polyurethane sealant and preparation method thereof |
| CN111892901A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Fast-curing two-component polyurethane sealant for hollow glass and preparation method thereof |
| CN111892898A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Anti-ultraviolet-aging two-component polyurethane hollow glass sealant and preparation method thereof |
| CN111892899A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Low-temperature easily-extruded double-component polyurethane hollow glass sealant and preparation method thereof |
| CN110055024A (en) * | 2019-05-10 | 2019-07-26 | 无锡市万力粘合材料股份有限公司 | Hollow glass warms up side spacer bar polyurethane hot melt adhesive composite and preparation method thereof |
| CN116948589A (en) * | 2023-09-20 | 2023-10-27 | 山东一诺威新材料有限公司 | Sealed high-modulus hollow glass edge sealing adhesive and preparation method thereof |
| CN116948589B (en) * | 2023-09-20 | 2023-12-12 | 山东一诺威新材料有限公司 | Sealed high-modulus hollow glass edge sealing adhesive and preparation method thereof |
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Application publication date: 20190122 |
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