CN110791249A - Two-component polyurethane sealant - Google Patents
Two-component polyurethane sealant Download PDFInfo
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- CN110791249A CN110791249A CN201911151204.4A CN201911151204A CN110791249A CN 110791249 A CN110791249 A CN 110791249A CN 201911151204 A CN201911151204 A CN 201911151204A CN 110791249 A CN110791249 A CN 110791249A
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a two-component polyurethane sealant which is prepared by mixing a component A and a component B, wherein the component A and the component B are characterized in that the following components are ensured in percentage by weight: the component A comprises: 30-60% of polyurethane prepolymer resin; 10-30% of reinforcing filler; 10-30% of other inorganic fillers; 0.05 to 0.5 percent of catalyst; 0.05 to 0.5 percent of other additives; the component B comprises: 10-60% of active hydrogen-containing compound; 10-30% of reinforcing filler; 0.05 to 0.5 percent of catalyst; 0.05 to 0.5 percent of other additives. The curing rate of the invention is faster and adjustable, for example, the surface is dried within 30 minutes and the whole adhesive layer is uniformly cured and molded, and after 8 hours, the adhesive has enough initial adhesion and high mechanical strength (compared with silane modified sealant, the adhesive can have strength higher than 30 percent, the operation time is controllable, and the curing reaction is more uniform.
Description
Technical Field
The invention belongs to the technical field of polyurethane sealants, and particularly relates to a two-component polyurethane sealant.
Background
The polyurethane sealant is a paste formed by mixing polyurethane prepolymer resin serving as a matrix and raw materials such as a filler, a plasticizer, a catalyst and the like, has the comprehensive properties of good elasticity, high mechanical strength, good bonding and sealing performance, excellent high and low temperature resistance, excellent chemical resistance and the like, and is widely applied to many industrial fields such as transportation, buildings and the like. The single-component polyurethane sealant is relatively simple in process, convenient to use and most widely applied.
The curing of the single-component polyurethane sealant is a moisture reaction in the air, a relatively compact curing layer can be formed after the surface of the adhesive layer reacts with moisture, and the compact curing layer is thicker and thicker along with the proceeding of the curing reaction and gradually influences the permeation of the moisture in the air, so that the curing rate is slower and slower, and particularly the proceeding of a subsequent process is often influenced for a system with a thicker adhesive layer. Compared with the prior art, the two-component polyurethane sealant has the advantages that the curing reaction does not depend on external moisture, so the reaction speed is greatly increased, the curing reaction of the glue layer is uniform, the bonding strength can be quickly established, and the two-component polyurethane sealant is particularly suitable for bonding and sealing occasions with thick glue layers.
The commonly used sealant is mostly black and white, and both black and white sealants have reinforcement requirements. The reinforcing function includes imparting higher tensile strength, elongation, elasticity, hardness, heat resistance, etc. to the product. In the formula, proper carbon black or white carbon black filler is selected to play a role in colloid reinforcement.
At present, most of common polyurethane sealant patents are concentrated on a single-component system, the number of the two-component systems is small, and particularly, the obtained sealant has the characteristics of high curing speed, high strength, controllable operation time, uniform curing reaction and the like and has strong practicability. More closely, a two-component silicone modified polyurethane sealant (e.g., CN101838513B) has significantly reduced mechanical properties due to its introduction of a siloxane structure into the host resin structure. More importantly, the production process is more complicated, the cost of raw materials is obviously increased, the price of the product is greatly increased, and the market competitiveness of the product is weakened.
Disclosure of Invention
In order to solve the practical problems that the existing single-component polyurethane sealant layer is slow in curing and long in time for building the strength of the sealant layer, particularly for occasions with deep sealant layers such as a filling structure, the invention aims to provide a double-component polyurethane sealant with high curing rate and high mechanical bonding strength.
The invention also aims to provide a preparation method of the two-component polyurethane sealant.
In order to realize one of the purposes of the invention, the adopted technical scheme is as follows:
a two-component polyurethane sealant is prepared by mixing a component A and a component B, wherein the component A and the component B are calculated according to the weight percentage and ensure the following components:
the component A comprises:
30-60% of polyurethane prepolymer resin;
10 to 40 percent of plasticizer
10-30% of reinforcing filler;
10-30% of other inorganic fillers;
0.05 to 0.5 percent of catalyst;
0.05 to 0.5 percent of other additives;
the component B comprises:
10-60% of active hydrogen-containing compound;
10 to 60 percent of plasticizer
10-30% of reinforcing filler;
0.05 to 0.5 percent of catalyst;
0.05 to 0.5 percent of other additives.
In a preferred embodiment of the present invention, the polyurethane prepolymer resin is pre-synthesized from the following components, by weight:
30-80 parts of polyol (with the functionality of 2-3);
20-40 parts of polyfunctional isocyanate;
0.05-0.5 part of catalyst.
In a preferred embodiment of the present invention, the polyol comprises any one or more of polyether polyol (functionality 2-3, molecular weight 2000-12000), polyester polyol (functionality 2, molecular weight 500-4000), polybutadiene diol, polytetrahydrofuran diol, or modified polyol based on any of the foregoing polyols.
In a preferred embodiment of the present invention, the polyfunctional isocyanate includes any one or more of toluene diisocyanate, diphenylmethane-4, 4' -diisocyanate, polymethylene polyphenyl polyisocyanate, isophorone diisocyanate, hexamethyl diisocyanate or dicyclohexylmethane diisocyanate.
In a preferred embodiment of the present invention, the reinforcing filler comprises any one or more of carbon black or white carbon.
In a preferred embodiment of the present invention, the active hydrogen-containing compound includes any one or more of polyoxypropylene diol, polyoxypropylene triol, polytetrahydrofuran diol, castor oil, soybean oil, polyester diol which is liquid at ordinary temperature, or water.
In a preferred embodiment of the present invention, the plasticizer comprises: phthalate esters such as any one or more of diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), phosphate esters such as triphenyl phosphate (TPP), triethyl phosphate (TEP), tributyl phosphate (TBP).
In a preferred embodiment of the present invention, the other additives include any one or more of a uv resistant agent, an antioxidant, a silane coupling agent.
In a preferred embodiment of the invention, the other inorganic filler comprises any one or more of calcium carbonate, kaolin or titanium dioxide.
In a preferred embodiment of the present invention, the catalyst comprises: any one or more of trimethylene diamine, dibutyltin dilaurate, stannous octoate, diethylenetriamine, dimethylhexadecylamine, triethanolamine, triethylene diamine, N-ethyl morpholine or modified tertiary amine catalysts.
In order to realize the second purpose of the invention, the adopted technical scheme is as follows:
a preparation method of a two-component polyurethane sealant comprises the following steps:
a component A prepolymerization step:
adding the polyol into a container, heating to 100 ℃, performing vacuum dehydration, cooling (the vacuum dehydration time is about 2 hours), adding the polyfunctional isocyanate at a temperature of not higher than 80 ℃ while stirring, and obtaining the polyurethane prepolymer resin for later use under the protection of nitrogen (the nitrogen protection reaction time is about 1 hour);
the preparation method of the component A sealing colloid comprises the following steps:
uniformly stirring and mixing the polyurethane prepolymer resin, the reinforcing filler dried by the vacuum oven, the other inorganic fillers and the plasticizer dehydrated in vacuum, continuously stirring for about 10 minutes, adding the other additives, continuously stirring for about 5 minutes, and hermetically packaging under the protection of nitrogen to obtain the component A colloid with viscous appearance and uniform texture;
and (3) uniformly stirring the active hydrogen-containing compound, the reinforcing filler dried by the vacuum oven and the plasticizer dehydrated in vacuum, continuously stirring for about 10 minutes, adding the other additives, continuously stirring for about 5 minutes, and hermetically packaging under the protection of nitrogen to obtain the component B colloid with viscous appearance and uniform texture.
The invention has the beneficial effects that:
the curing rate of the invention is faster and adjustable, for example, the surface is dried within 30 minutes and the whole adhesive layer is uniformly cured and molded, and after 8 hours, the adhesive has enough initial adhesion and high mechanical strength (compared with silane modified sealant, the adhesive can have strength higher than 30 percent, the operation time is controllable, and the curing reaction is more uniform.
Detailed Description
The main principle of the invention is as follows: the NCO group contained in the polyurethane prepolymer resin of the component A and the hydroxyl (-OH) group of the component B are fully mixed and react in the presence of a catalyst to achieve the aim of quick and uniform reaction. The components in the formula play a role in a synergistic manner: the structure of the prepolymer resin endows the product with basic performance and adhesiveness; the reinforcing filler plays a reinforcing role, the too little effect is not obvious, and the viscosity of the too much system is too high; the catalyst is used for adjusting the reaction rate and endowing the product with a feasible operation process.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: 800 g of trifunctional polyether (hydroxyl value 35) and 40 g of polyether (PPG2000) with the molecular weight of 2000 and the functionality of 2 are added into a three-neck flask, stirred and heated to 100 ℃, vacuum-dehydrated for 2 hours, then vacuumized, stirred and added with 90 g of diphenylmethane diisocyanate, and kept reacting for 1 hour to obtain the polyurethane prepolymer resin 1.
Step two: preparation of component A colloid: the preparation method comprises the following steps of uniformly mixing 35 parts of polyurethane prepolymer resin 1, 25 parts of dehydrated plasticizer diisodecyl phthalate (DIDP), 20 parts of carbon black and 20 parts of calcium carbonate in a double-planet stirring kettle, opening vacuum, increasing the rotating speed and stirring for 10 minutes. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant which respectively account for 0.05 weight percent of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the A-component polyurethane colloid with viscous appearance and uniform texture.
Step three: and (3) preparation of component B colloid: 40 parts of polyether (PPG2000) with molecular weight of 2000 and functionality of 2 subjected to dehydration treatment and 20 parts of diisodecyl phthalate (DIDP) serving as a plasticizer subjected to vacuum dehydration are slowly and uniformly stirred in a double-planet stirring kettle, then 20 parts of carbon black and 20 parts of calcium carbonate dried in a vacuum oven are added, and the mixture is stirred for 10 minutes by opening the vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.05% of the total amount, continuously stirring for 5 minutes, and discharging to obtain the component B colloid of the polyurethane sealant with viscous appearance and uniform texture.
Example 2
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: 1000 g of trifunctional polyether (hydroxyl value 35) and 40 g of polyether (PPG1000) with the molecular weight of 1000 and the functionality of 2 are added into a three-neck flask, stirred and heated to 110 ℃, vacuum-dehydrated for 2 hours, then vacuumized, 105 g of diphenylmethane diisocyanate is added while stirring, and the reaction is maintained for 1 hour to obtain the polyurethane prepolymer resin 2.
Step two: preparation of component A colloid: 33 parts of polyurethane prepolymer resin, 28 parts of dehydrated flame-retardant plasticizer triethyl phosphate (TEP), 21 parts of carbon black and 18 parts of calcium carbonate are uniformly mixed in a double-planet stirring kettle, and then the mixture is stirred for 10 minutes by opening vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant which respectively account for 0.05 weight percent of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the A-component polyurethane colloid with viscous appearance and uniform texture.
Step three: and (3) preparation of component B colloid: polyether (PPG1000) with molecular weight of 1000 and functionality of 2 and 27 parts of dehydrated plasticizer flame retardant plasticizer triethyl phosphate (TEP) are slowly stirred uniformly in a double-planet stirring kettle, 20 parts of carbon black and 20 parts of calcium carbonate dried in a vacuum oven are added, and the mixture is stirred for 10 minutes by opening vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.05% of the total amount, continuously stirring for 5 minutes, and discharging to obtain the component B colloid of the polyurethane sealant with viscous appearance and uniform texture.
Example 3
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: the same as in example 1, polyurethane prepolymer resin 1.
Step two: preparation of component A colloid: uniformly mixing 35 parts of polyurethane prepolymer resin 1, 25 parts of dehydrated plasticizer diisodecyl phthalate (DIDP), 20 parts of white carbon black and 20 parts of calcium carbonate in a double-planet stirring kettle, opening vacuum, increasing the rotating speed and stirring for 10 minutes. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant which respectively account for 0.05 weight percent of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the A-component polyurethane colloid with viscous appearance and uniform texture.
Step three: and (3) preparation of component B colloid: 3 parts of deionized water and 50 parts of vacuum-dehydrated plasticizer diisodecyl phthalate (DIDP) are slowly and uniformly stirred in a double-planet stirring kettle, 20 parts of vacuum oven-dried white carbon black and 20 parts of calcium carbonate are added, and the mixture is stirred for 10 minutes by opening vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.05% of the total amount, continuously stirring for 5 minutes, and discharging to obtain the component B colloid of the polyurethane sealant with viscous appearance and uniform texture.
Example 4
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: the same as in example 1, polyurethane prepolymer resin 1.
Step two: preparation of component A colloid: uniformly mixing 35 parts of polyurethane prepolymer resin 1, 25 parts of dehydrated plasticizer diisodecyl phthalate (DIDP), 20 parts of white carbon black and 20 parts of calcium carbonate in a double-planet stirring kettle, opening vacuum, increasing the rotating speed and stirring for 10 minutes. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant which respectively account for 0.05 weight percent of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the A-component polyurethane colloid with viscous appearance and uniform texture.
Step three: and (3) preparation of component B colloid: 3 parts of deionized water and 50 parts of vacuum-dehydrated plasticizer diisodecyl phthalate (DIDP) are slowly and uniformly stirred in a double-planet stirring kettle, 20 parts of vacuum oven-dried white carbon black and 20 parts of calcium carbonate are added, and the mixture is stirred for 10 minutes by opening vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.1% of the total amount, continuously stirring for 5 minutes, and discharging to obtain the component B colloid of the polyurethane sealant with viscous appearance and uniform texture.
Example 5
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: the same as in example 1, polyurethane prepolymer resin 1.
Step two: preparation of component A colloid: uniformly mixing 35 parts of polyurethane prepolymer resin 1, 25 parts of dehydrated plasticizer diisodecyl phthalate (DIDP),5 parts of white carbon black and 35 parts of calcium carbonate in a double-planet stirring kettle, opening vacuum, increasing the rotating speed and stirring for 10 minutes. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant which respectively account for 0.05 weight percent of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the A-component polyurethane colloid with viscous appearance and uniform texture.
Step three: and (3) preparation of component B colloid: 3 parts of deionized water and 50 parts of vacuum-dehydrated plasticizer diisodecyl phthalate (DIDP) are slowly and uniformly stirred in a double-planet stirring kettle, 20 parts of vacuum oven-dried white carbon black and 20 parts of calcium carbonate are added, and the mixture is stirred for 10 minutes by opening vacuum and increasing the rotating speed. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.05% of the total amount, continuously stirring for 5 minutes, and discharging to obtain the component B colloid of the polyurethane sealant with viscous appearance and uniform texture.
Comparative example
The method comprises the following steps: synthesis of A component polyurethane prepolymer resin: into a three-neck flask, 900 g of trifunctional polyether (hydroxyl value 35) and 40 g of polyether (PPG2000) having a molecular weight of 2000 and a functionality of 2 were added, and the mixture was stirred, heated to 110 ℃ and dehydrated under vacuum for 2 hours, then the mixture was vacuumed, and 90 g of diphenylmethane diisocyanate was added while stirring, and the reaction was maintained for 1 hour to obtain polyurethane prepolymer resin 3.
Step two: preparation of component A colloid: mixing 35 parts of polyurethane prepolymer resin 2, 25 parts of dehydrated plasticizer diisodecyl phthalate (DIDP) and 15 parts of white carbon black uniformly in a double-planet stirring kettle, opening vacuum, increasing the rotating speed and stirring for 10 minutes. Then adding catalyst dibutyltin dilaurate, uvioresistant agent and antioxidant in 0.05% of the total amount, continuously stirring for 5 minutes, discharging, sealing and packaging to obtain the single-component polyurethane sealant with viscous appearance and uniform texture.
Evenly mixing the A, B components at normal temperature according to a mixing ratio, and testing, wherein the surface drying time is the time for the surface of the sealant to lose adhesion by touching with a foreign object; after 8 hours, the curing condition is that the glue layer is cut by a knife after being placed at normal temperature for 8 hours, and whether the glue layer is cured or not and the curing depth condition are observed; the mechanical properties are tested according to ISO 527-2: 1993; the normal temperature shearing bonding strength is tested according to the GB/T7124-2008 standard. The test results are shown in table 1 below:
TABLE 1
Data are measured after 7 days at ambient temperature.
Compared with the single-component polyurethane sealant in the comparative example, the two-component polyurethane sealant in the embodiment has the advantages of fast curing speed and uniform curing condition, and meets the requirements of deep adhesive layer and fast process. Meanwhile, compared with the example 4 and the example 3, the surface drying time is shortened due to the increase of the using amount of the catalyst in the example 4; the too small amount of reinforcing filler in example 5 is a factor of the final decrease in mechanical properties.
Claims (10)
1. A two-component polyurethane sealant is prepared by mixing a component A and a component B, wherein the component A and the component B are characterized in that the following components are ensured in percentage by weight:
the component A comprises:
30-60% of polyurethane prepolymer resin;
10-30% of reinforcing filler;
10-30% of other inorganic fillers;
0.05 to 0.5 percent of catalyst;
0.05 to 0.5 percent of other additives;
the component B comprises:
10-60% of active hydrogen-containing compound;
10-30% of reinforcing filler;
0.05 to 0.5 percent of catalyst;
0.05 to 0.5 percent of other additives.
2. The two-component polyurethane sealant of claim 1 wherein the polyurethane prepolymer resin is pre-synthesized from the following components in weight percent:
30-80 parts of polyol (with the functionality of 2-3);
20-40 parts of polyfunctional isocyanate;
0.05-0.5 part of catalyst.
3. The two-component polyurethane sealant of claim 2 wherein the polyol comprises any one or more of a polyether polyol (functionality 2-3, molecular weight 2000-12000), a polyester polyol (functionality 2, molecular weight 500-4000), a polybutadiene diol, a polytetrahydrofuran diol, or a modified polyol based on any of the foregoing polyols.
4. The two-component polyurethane sealant according to claim 2 wherein the polyfunctional isocyanate comprises any one or more of toluene diisocyanate, diphenylmethane-4, 4' -diisocyanate, polymethylene polyphenyl polyisocyanate, isophorone diisocyanate, hexamethyl diisocyanate or dicyclohexylmethane diisocyanate.
5. The two-component polyurethane sealant of claim 1 wherein said reinforcing filler comprises any one or more of carbon black or white carbon.
6. The two-component polyurethane sealant of claim 1 wherein the active hydrogen-containing compound comprises any one or more of polyoxypropylene diol, polyoxypropylene triol, polytetrahydrofuran diol, castor oil, soybean oil, polyester diol which is liquid at ambient temperature, or water.
7. The two-component polyurethane sealant of claim 1 wherein the plasticizer comprises any one or more of phthalic acid esters such as diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), phosphoric acid esters such as triphenyl phosphate (TPP), triethyl phosphate (TEP), and tributyl phosphate (TBP).
8. The two-component polyurethane sealant of claim 1 wherein said catalyst comprises: any one or more of trimethylene diamine, dibutyltin dilaurate, stannous octoate, diethylenetriamine, dimethylhexadecylamine, triethanolamine, triethylene diamine, N-ethyl morpholine or modified tertiary amine catalysts.
9. The two-component polyurethane sealant of claim 1 wherein said other additives include any one or more of a uv light inhibitor, an antioxidant, a silane coupling agent.
10. The method of preparing a two-component polyurethane sealant according to any one of claims 1 to 9, comprising the steps of:
a component A prepolymerization step:
adding the polyol into a container, heating to 100 ℃, performing vacuum dehydration, cooling, adding the polyfunctional isocyanate while stirring at a temperature of not higher than 80 ℃, and performing nitrogen protection reaction to obtain the polyurethane prepolymer resin for later use;
the preparation method of the component A sealing colloid comprises the following steps:
uniformly stirring and mixing the polyurethane prepolymer resin, the reinforcing filler dried by the vacuum oven, the other inorganic fillers and the plasticizer dehydrated in vacuum, continuously stirring, adding the other additives, continuously stirring, and hermetically packaging under the protection of nitrogen to obtain the component A colloid with viscous appearance and uniform texture;
and (3) uniformly stirring the active hydrogen-containing compound, the reinforcing filler dried by the vacuum oven and the plasticizer dehydrated in vacuum, continuously stirring, adding the other additives, continuously stirring, and hermetically packaging under the protection of nitrogen to obtain the component B colloid with viscous appearance and uniform texture.
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| CN111234766A (en) * | 2020-03-17 | 2020-06-05 | 北京华腾新材料股份有限公司 | Ultralow-temperature and cold-heat impact resistant two-component polyurethane adhesive and preparation method thereof |
| CN111467995A (en) * | 2020-04-30 | 2020-07-31 | 合肥德胜包装材料有限公司 | Preparation process of polyurethane sealing glue |
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| CN106753178A (en) * | 2016-12-28 | 2017-05-31 | 成都硅宝科技股份有限公司 | Dual-component polyurethane fluid sealant and preparation method thereof |
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| CN111467995A (en) * | 2020-04-30 | 2020-07-31 | 合肥德胜包装材料有限公司 | Preparation process of polyurethane sealing glue |
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