CN112724909A

CN112724909A - High-shear-strength two-component polyurethane corner adhesive and preparation method thereof

Info

Publication number: CN112724909A
Application number: CN202011609418.4A
Authority: CN
Inventors: 王小伟; 潘守伟; 陈权; 程梦平
Original assignee: Guangzhou Conghua Zhaoshun New Material Co ltd; Guangzhou Jointas Chemical Co Ltd
Current assignee: Guangzhou Conghua Zhaoshun New Material Co ltd; Guangzhou Jointas Chemical Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-30

Abstract

The invention provides a high-shear-strength two-component polyurethane corner adhesive which comprises a component A and a component B in percentage by mass; the component A comprises: 15% -30% of NCO-terminated polyurethane prepolymer; 15 to 35 percent of polymethylene polyphenyl polyisocyanate; 30 to 50 percent of nano calcium carbonate; water removal agent A0-4%; 0-4% of fumed silica; the component B comprises: 20 to 40 percent of polypropylene carbonate trihydric alcohol; 10 to 30 percent of polypropylene carbonate dihydric alcohol; 30 to 50 percent of nano calcium carbonate; water removal agent B0-5%; 0.5 to 3 percent of adhesion promoter; 0.01 to 0.3 percent of catalyst; 0-4% of fumed silica. The polypropylene carbonate polyol is added into the polyurethane corner adhesive prepared by the invention, so that the strength of the polyurethane corner adhesive is higher than that of the conventional polyether corner adhesive, and the shear strength is improved to 15 MPa.

Description

High-shear-strength two-component polyurethane corner adhesive and preparation method thereof

Technical Field

The invention relates to the technical field of sealants/adhesives, in particular to a high-shear-strength two-component polyurethane corner adhesive and a preparation method thereof.

Background

With the continuous improvement of the economic level of China, the construction industry becomes a new industry for economic development, and the energy conservation of buildings also becomes a main trend for the development of China. Compared with the traditional doors and windows made of aluminum alloy and the like, the system doors and windows have excellent energy-saving effect, so that the system doors and windows are strongly promoted in the market. Therefore, the corner-combining structural adhesive for corner combining also comes into the spring. The angle strength after angle combination is an important performance index for measuring the quality of the system door and window, most angle combination processes on the market are mechanically fixed at present, and are difficult to adapt to the door and window in the production and installation processes, and are not damaged due to moving errors during carrying, transportation and installation construction and various forces encountered in long-term use. The correct angle combination mode is punching glue injection, so that the angle code and the aluminum profile are really and permanently bonded together. Therefore, products that can be used for corner-setting adhesives require not only high strength and high adhesion, but also certain flexibility and sealability.

At present, the single-component polyurethane corner adhesive is used in domestic door and window assembly plants, and compared with the double-component polyurethane corner adhesive, the single-component polyurethane corner adhesive has low shearing resistance and bonding strength and long curing time, and can not meet the construction requirements of the door and window plants. Even if the two-component polyurethane corner adhesive is mostly of a common polyether type, the two-component polyurethane corner adhesive also has the defects of poor strength and poor adhesion, so that the final two-component polyurethane corner adhesive product cannot meet the requirements of high strength and high adhesion, is not suitable for corner adhesion of doors and windows of a system, and cannot meet the requirements of high strength performance of the market.

Therefore, how to develop a high-strength two-component corner-forming adhesive is an urgent problem to be solved.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a two-component polyurethane corner adhesive with high shear strength and a preparation method thereof, wherein the prepared two-component polyurethane corner adhesive has high adhesive property and shear strength.

The invention provides a high-shear-strength two-component polyurethane corner adhesive which comprises a component A and a component B in percentage by mass;

the component A comprises:

or the component A comprises:

the component B comprises:

the total amount of the component A and the component B respectively satisfies 100%.

Preferably, the NCO-terminated polyurethane prepolymer is obtained by polymerizing polypropylene carbonate diol and diisocyanate.

Preferably, the molecular weight of the polypropylene carbonate dihydric alcohol is 1000-3000;

the diisocyanate is diphenylmethane diisocyanate.

Preferably, the water removal agent A is one or more of oxazolidine water removal agent and molecular sieve activated powder;

the water removing agent B is one or more of vinyl trimethoxy silane and molecular sieve activated powder.

Preferably, in the component B, the molecular weight of the polypropylene carbonate trihydric alcohol is 500-1000;

the molecular weight of the polypropylene carbonate dihydric alcohol is 500-3000.

Preferably, the polypropylene carbonate diol comprises polypropylene carbonate diol with a molecular weight of 500 and polypropylene carbonate diol with a molecular weight of 1000;

the mass ratio of the 500 molecular weight polypropylene carbonate dihydric alcohol to the 1000 molecular weight polypropylene carbonate dihydric alcohol is preferably (1-3): 1.

preferably, the adhesion promoter is obtained by condensation reaction of methyl triethoxysilane, gamma-aminopropyl triethoxysilane and gamma-glycidoxypropyl trimethoxysilane.

Preferably, the catalyst is one or more of stannous octoate, di-n-butyl tin dilaurate, organic bismuth and organic zinc.

The invention provides a preparation method of the two-component polyurethane corner adhesive, which comprises the following steps:

adding an NCO-terminated polyurethane prepolymer into a planetary kettle, adding polymethylene polyphenyl polyisocyanate, nano calcium carbonate, a water removing agent A and fumed silica, and stirring in a vacuum state to obtain a component A;

adding the polypropylene carbonate trihydric alcohol, the polypropylene carbonate dihydric alcohol and the nano calcium carbonate into a planetary kettle, heating to 110-130 ℃, stirring and dehydrating under a vacuum state, then cooling to 40-60 ℃, adding the water removing agent, the adhesion promoter, the catalyst and the fumed silica, and stirring under a vacuum state to obtain the component B.

Compared with the prior art, the invention provides the high-shear-strength two-component polyurethane corner adhesive which comprises a component A and a component B in percentage by mass.

The invention obtains the following beneficial effects:

1) the prepared polyurethane corner adhesive is added with the polypropylene carbonate polyol to replace polyether polyol used in corner adhesive products on the market, the polypropylene carbonate polyol has carbonate bonds, and the two ends of the polypropylene carbonate polyol are of polyether structures, so that the strength of the polyurethane corner adhesive is higher than that of the conventional polyether corner adhesive, and the shearing strength is improved to 15 MPa.

2) The poly (propylene carbonate) polyol is synthesized by taking carbon dioxide as an initial raw material, adding an initiator and carrying out catalytic copolymerization with propylene oxide, has good mechanical property and low cost, can relieve greenhouse effect by consuming carbon dioxide gas in large-scale production, and has great significance for environmental protection, energy conservation and emission reduction.

3) The adhesion promoter used by the polyurethane corner-bonding adhesive prepared by the invention is a copolymer of epoxy silane coupling agent, amino silane coupling agent and methyl triethoxysilane which is refluxed for 6 hours at 120 ℃, and the adhesion of the polyurethane corner-bonding adhesive prepared by the invention to aluminum material is better than that of the polyurethane corner-bonding adhesive prepared by singly using epoxy silane coupling agent or amino silane coupling agent.

4) The polyurethane corner-forming adhesive prepared by the invention does not contain solvent and o-benzene plasticizer, and meets the requirement of environmental protection.

Detailed Description

the component A comprises:

or the component A comprises:

the component B comprises:

the NCO-terminated polyurethane prepolymer is obtained by polymerizing polypropylene carbonate dihydric alcohol and diisocyanate.

In the invention, the molecular weight of the polypropylene carbonate dihydric alcohol is preferably 1000-3000, and more preferably any one or more of the polypropylene carbonate dihydric alcohol with the molecular weight of 1000, the polypropylene carbonate dihydric alcohol with the molecular weight of 2000 and the polypropylene carbonate dihydric alcohol with the molecular weight of 3000.

The above molecular weight index average molecular weight.

The diisocyanate is preferably diphenylmethane diisocyanate.

The weight ratio of the polypropylene carbonate dihydric alcohol to the diisocyanate is preferably (1-4): 1.

the polymerization temperature is preferably 60 to 100 ℃, and more preferably 80 ℃.

The polymerization time is preferably 1 to 3 hours, and more preferably 3 hours.

The mass content of the NCO-terminated polyurethane prepolymer in the component A is preferably 15-30%, more preferably 20-30%, and specifically 15%, 20%, 25%, 30%, or an interval value with any value as an upper limit value or a lower limit value.

The content of the polymethylene polyphenyl polyisocyanate in the component a is preferably 15% to 35% by mass, more preferably 20% to 30% by mass, and specifically may be selected from 15%, 20%, 25%, 30%, 35% by mass, or an interval value in which any of the above values is an upper limit value or a lower limit value.

The content of the nano calcium carbonate in the component a is preferably 30% to 50%, more preferably 40% to 50%, and specifically may be selected from 30%, 35%, 40%, 45%, 46%, 46.5%, 48.7%, 49%, 49.7%, 50%, or an interval value where any of the above values is an upper limit value or a lower limit value.

In the component A, the water removal agent A is preferably one or more of oxazolidine water removal agent and molecular sieve activated powder.

The molecular sieve activating powder is preferably 4A-grade molecular sieve activating powder.

The mass content of the water scavenger a in the component a is preferably 0 to 4%, more preferably 0.1 to 3.5%, and even more preferably 0.3 to 3.5%, and may be selected from 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 2%, 3%, 3.5%, or an interval value where any of the above values is an upper limit value or a lower limit value.

The mass content of the oxazolidine water remover in the component A is preferably 0-0.5%, more preferably 0.1-0.5%, and even more preferably 0.3-0.5%, and specifically may be selected from 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, or an interval value in which any of the above values is an upper limit value or a lower limit value.

The mass content of the molecular sieve activation powder in the component A is preferably 1-3%, and more preferably 3%.

The fumed silica is preferably 200m in specific surface area²Hydrophobic fumed silica per gram.

The mass content of the fumed silica in the component A is preferably 0-4%, more preferably 0.5-1%, and specifically can be selected from 0.5% or 1%.

In some further embodiments of the invention, component a comprises:

further preferably, the component a comprises:

preferably, the water scavenger a comprises:

0.5 percent of oxazolidine water remover;

3 percent of molecular sieve activation powder.

The NCO-terminated polyurethane prepolymer, the nano calcium carbonate, the water remover A and the fumed silica are the same as above, and are not described again.

In the invention, the total content of the components A meets 100 percent.

In the component B, the molecular weight of the polypropylene carbonate triol is preferably 500-1000, and more preferably 500.

The content of the polypropylene carbonate triol in the component B is preferably 20 to 40% by mass, more preferably 30 to 40% by mass, even more preferably 30 to 36% by mass, and specifically may be selected from 30% or 36% by mass.

The molecular weight of the polypropylene carbonate dihydric alcohol is preferably 500-3000, more preferably 500-1000, and further preferably one or more of the polypropylene carbonate dihydric alcohol with the molecular weight of 500, the polypropylene carbonate dihydric alcohol with the molecular weight of 1000, the polypropylene carbonate dihydric alcohol with the molecular weight of 2000 and the polypropylene carbonate dihydric alcohol with the molecular weight of 3000.

The content of the polypropylene carbonate diol in the component B is preferably 10-30% by mass, and more preferably 20-25% by mass.

In some embodiments of the invention, the polypropylene carbonate diol comprises polypropylene carbonate diol having a molecular weight of 500 and polypropylene carbonate diol having a molecular weight of 1000.

The mass ratio of the 500 molecular weight polypropylene carbonate dihydric alcohol to the 1000 molecular weight polypropylene carbonate dihydric alcohol is preferably (1-3): 1, more preferably (1 to 1.5): 1.

the content of the polypropylene carbonate glycol with the molecular weight of 500 in the component B is preferably 10-15% by mass, and more preferably 10% or 15% by mass.

The content of the polypropylene carbonate glycol with the molecular weight of 1000 in the component B is preferably 10-15% by mass, and more preferably 10% by mass.

The content of the nano calcium carbonate in the component B is preferably 30% to 50%, more preferably 35% to 40%, and specifically may be selected from 35%, 36%, 37%, 38%, 39%, 40%, or an interval value where any of the above values is an upper limit value or a lower limit value.

The water removing agent B in the component B is preferably one or more of vinyl trimethoxy silane and molecular sieve activated powder.

The mass content of the water scavenger B in the component B is preferably 0-5%, more preferably 3-4%, and specifically may be selected from 3%, 3.5% or 4%, or an interval value in which any value is an upper limit value or a lower limit value.

In some embodiments of the invention, the water scavenger B comprises vinyltrimethoxysilane and a molecular sieve activating powder.

The mass content of the vinyltrimethoxysilane is preferably 0.1 to 1 percent, more preferably 0.5 to 1 percent, and specifically can be selected from 0.1 percent, 0.5 percent, 1 percent, or an interval value with any value of the above values as an upper limit value or a lower limit value.

The mass content of the molecular sieve activated powder is preferably 1% to 4%, more preferably 2% to 3%, and specifically may be selected from 1%, 2%, 3%, 4%, or an interval value in which any of the above values is an upper limit value or a lower limit value.

The adhesion promoter is preferably obtained by condensation reaction of methyl triethoxysilane, gamma-aminopropyl triethoxysilane and gamma-glycidoxypropyl trimethoxysilane.

The condensation reaction temperature is preferably 100-140 ℃, and more preferably 120 ℃.

The time of the polymerization reaction is preferably 4 to 8 hours, and more preferably 6 hours.

The mass ratio of the methyl triethoxysilane to the gamma-aminopropyl triethoxysilane to the gamma-glycidoxypropyl trimethoxysilane is preferably (4-7): (3-4): 1, and more preferably 5:3.5: 1.

The mass content of the adhesion promoter in component B is preferably 0.5% to 3%, more preferably 1% to 3%, and may be selected from 1%, 2%, 3%, or a range where any of the above values is an upper limit value or a lower limit value.

The adhesion promoter used by the existing polyurethane corner glue is a single epoxy silane coupling agent or amino silane coupling agent, the adhesion promoter added into the polyurethane corner glue prepared by the invention is a copolymer of the epoxy silane coupling agent, the amino silane coupling agent and methyl triethoxysilane which are refluxed for 6 hours at 120 ℃, and the adhesion of the polyurethane corner glue prepared by singly using the epoxy silane coupling agent or the amino silane coupling agent to aluminum materials is better.

The catalyst is preferably one or more of stannous octoate, di-n-butyltin dilaurate, organobismuth and organozinc, and is more preferably organobismuth.

The mass content of the catalyst in the component B is preferably 0.01% to 0.3%, more preferably 0.05% to 0.1%, and specifically may be selected from 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 1%, or a range where any of the above values is an upper limit value or a lower limit value.

The mass content of the fumed silica in the component B is preferably 0 to 4%, more preferably 0.1 to 1%, and even more preferably 0.1 to 0.5%, and specifically may be selected from 0.1%, 0.2%, 0.3%, 0.4%, and 0.5%, or an interval value in which any of the above values is an upper limit value or a lower limit value.

In the invention, the total content of the components B meets 100 percent.

The high-shear-strength two-component polyurethane corner adhesive is prepared by mixing the component A and the component B.

The volume ratio of the component A and the component B is preferably 1: 1.

Specifically, the component A and the component B are respectively packaged and mixed according to the volume ratio of 1:1, and the high-shear-strength two-component polyurethane corner adhesive can be obtained.

The polypropylene carbonate dihydric alcohol belongs to polypropylene carbonate polyol (PPC), and the structural formula is as follows:

as can be seen from the above structural formula, the polypropylene carbonate polyol has a carbonate bond and both ends have a polyether structure. The two-component polyurethane corner adhesive synthesized by adopting the polypropylene carbonate polyol has the strength of polyester and the flexibility of polyether, the tensile and shear strength can reach 15MPa, and the requirements of high strength, high hardness and good flexibility of the corner adhesive are met.

The invention provides a preparation method of the high-shear-strength two-component polyurethane corner adhesive, which comprises the following steps:

adding the polypropylene carbonate trihydric alcohol, the polypropylene carbonate dihydric alcohol and the nano calcium carbonate into a planetary kettle, heating to 110-130 ℃, preferably 120 ℃, stirring and dehydrating under a vacuum state, then cooling to 40-60 ℃, preferably 50 ℃, adding the dehydrator, the adhesion promoter, the catalyst and the fumed silica, and stirring under the vacuum state to obtain a component B;

the stirring time is preferably 0.5-1 h.

The NCO-terminated polyurethane prepolymer is preferably prepared according to the following method:

reacting polypropylene carbonate dihydric alcohol with diisocyanate under a vacuum condition, sampling and detecting NCO content, and obtaining the NCO-terminated polyurethane prepolymer after the-NCO content reaches a theoretical value.

The reaction temperature is preferably 70-90 ℃, and the reaction time is preferably 2-4 h.

In some embodiments of the present invention, the NCO-terminated polyurethane prepolymer is prepared by the following method:

weighing and adding metered polypropylene carbonate dihydric alcohol into a dry stirring kettle, heating to 60 ℃ while stirring, slowly adding metered diphenylmethane diisocyanate, gradually heating to 80 ℃ in vacuum, reacting for 3 hours at constant temperature, sampling and detecting NCO content, and obtaining the NCO-terminated polyurethane prepolymer after-NCO content reaches a theoretical value.

In order to further illustrate the present invention, the following will describe the high shear strength two-component polyurethane corner glue and the preparation method thereof in detail with reference to the examples.

Example 1 preparation of reflow adhesion promoters:

220g of methyltriethoxysilane, 154g of gamma-aminopropyltriethoxysilane and 44g of gamma-glycidoxypropyltrimethoxysilane are added into a flask with a stirring, vacuum and refluxing device, the stirring is started, and the temperature is raised to 120 ℃ for refluxing for 6 hours, so that the refluxing adhesion promoter is obtained.

Example 2

1) Preparation of NCO-terminated polyurethane prepolymer:

870g of polypropylene carbonate dihydric alcohol with the molecular weight of 1000 is weighed and added into a dry stirring kettle, the temperature is raised to 60 ℃ while stirring, 500g of MDI is slowly added, the temperature is gradually raised to 80 ℃ under vacuum, and the constant temperature reaction is carried out for 3 hours, so as to obtain the prepolymer.

Preparation of component A:

and (3) adding 20 parts of prepolymer, 30 parts of polymeric MDI, 48.7 parts of nano calcium carbonate, 0.3 part of oxazolidine water remover and 1 part of hydrophobic fumed silica into a planetary stirrer, and stirring and dispersing for 1 hour under a vacuum state to obtain the component A.

Preparation of the component B:

30 parts of polypropylene carbonate triol with the molecular weight of 500, 15 parts of polypropylene carbonate diol with the molecular weight of 500 and 10 parts of polypropylene carbonate diol with the molecular weight of 1000 are added into a planetary stirrer, vacuum dehydration is carried out at 120 ℃ for 2 hours, then the temperature is reduced to 60 ℃, 39 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of the reflow adhesion promoter prepared in the example 1, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.06% of organic bismuth catalyst are added, and stirring is carried out for 2 hours under the vacuum state, so as to obtain the component B.

Respectively packaging A, B components into 600ml 1:1 rubber tubes, and mixing according to the volume ratio of 1:1 when in use to obtain the high-shear-strength two-component polyurethane corner adhesive.

Example 3

Preparation of NCO-terminated polyurethane prepolymer:

Preparation of component A:

adding 30 parts of prepolymer, 20 parts of polymeric MDI, 49.7 parts of nano calcium carbonate and 0.3 part of oxazolidine water remover into a planetary stirrer, and stirring and dispersing for 1 hour under a vacuum state to obtain the component A.

Preparation of the component B:

adding 36 parts of polypropylene carbonate triol with the molecular weight of 500, 10 parts of polypropylene carbonate diol with the molecular weight of 500 and 10 parts of polypropylene carbonate diol with the molecular weight of 1000 into a planetary stirrer, carrying out vacuum dehydration at 120 ℃ for 2 hours, then cooling to 60 ℃, adding 38 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of the reflux adhesion promoter prepared in example 1, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.06% of organic bismuth catalyst, and stirring for 2 hours in a vacuum state to obtain a component B.

Example 4

Preparation of NCO-terminated polyurethane prepolymer:

770g of 2000 molecular weight polypropylene carbonate dihydric alcohol is weighed and added into a dry stirring kettle, the temperature is raised to 60 ℃ while stirring, 250g of MDI is slowly added, the temperature is gradually raised to 80 ℃ under vacuum, and the constant temperature reaction is carried out for 3 hours, so as to obtain the prepolymer.

Preparation of component A:

20 parts of prepolymer, 30 parts of polymeric MDI, 49 parts of nano calcium carbonate, 0.5 part of oxazolidine water remover and 0.5 part of hydrophobic fumed silica are added into a planetary mixer and stirred and dispersed for 1 hour under a vacuum state to obtain the component A.

Preparation of the component B:

30 parts of polypropylene carbonate triol with the molecular weight of 500, 15 parts of polypropylene carbonate diol with the molecular weight of 500 and 10 parts of polypropylene carbonate diol with the molecular weight of 1000 are added into a planetary stirrer, vacuum dehydration is carried out at 120 ℃ for 2 hours, then the temperature is reduced to 60 ℃, 38 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of the reflow adhesion promoter prepared in the example 1, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.06% of organic bismuth catalyst are added, and stirring is carried out for 2 hours under the vacuum state, so as to obtain the component B.

Example 5

Preparation of NCO-terminated polyurethane prepolymer:

weighing 1000g of 3000 molecular weight polypropylene carbonate dihydric alcohol, adding the weighed dihydric alcohol into a dry stirring kettle, heating to 60 ℃ while stirring, slowly adding 250g of MDI, gradually heating to 80 ℃ under vacuum, and reacting for 3 hours at constant temperature to obtain the prepolymer.

Preparation of component A:

adding 20 parts of prepolymer, 30 parts of polymeric MDI, 46.5 parts of nano calcium carbonate, 0.5 part of oxazolidine water removing agent and 3 parts of 4A-grade molecular sieve activating powder into a planetary stirrer, and stirring and dispersing for 1 hour under a vacuum state to obtain a component A.

Preparation of the component B:

30 parts of polypropylene carbonate triol with the molecular weight of 500, 15 parts of polypropylene carbonate diol with the molecular weight of 500 and 10 parts of polypropylene carbonate diol with the molecular weight of 1000 are added into a planetary stirrer, vacuum dehydration is carried out at 120 ℃ for 2 hours, then the temperature is reduced to 60 ℃, 38 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of the reflow adhesion promoter prepared in the example 1, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.08 percent of organic bismuth catalyst are added, and stirring is carried out for 2 hours under the vacuum state, so as to obtain the component B.

Example 6

Preparation of NCO-terminated polyurethane prepolymer:

Preparation of component A:

adding 50 parts of prepolymer, 45.5 parts of nano calcium carbonate, 0.5 part of oxazolidine water removal agent, 3 parts of 4A-grade molecular sieve activation powder and 1 part of hydrophobic fumed silica into a planetary stirrer, and stirring and dispersing for 1 hour under a vacuum state to obtain a component A.

Preparation of the component B:

30 parts of polypropylene carbonate triol with the molecular weight of 500, 5 parts of polypropylene carbonate dihydric alcohol with the molecular weight of 3000 and 20 parts of polypropylene carbonate dihydric alcohol with the molecular weight of 1000 are added into a planetary stirrer, vacuum dehydration is carried out at 120 ℃ for 2 hours, then the temperature is reduced to 60 ℃, 39 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of reflux adhesion promoter, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.1% of ZC-E are added, and stirring is carried out for 2 hours under the vacuum state, thus obtaining the component B.

Comparative example 1

Preparation of NCO-terminated polyurethane prepolymer:

870g of polyoxypropylene glycol with the molecular weight of 1000 is weighed and added into a dry stirring kettle, the temperature is raised to 60 ℃ while stirring, 500g of MDI is slowly added, the temperature is gradually raised to 80 ℃ under vacuum, and the constant temperature reaction is carried out for 3 hours, so that the prepolymer is obtained.

Preparation of component A:

Preparation of the component B:

adding 30 parts of polyether triol with the molecular weight of 500, 15 parts of polyether diol with the molecular weight of 500 and 10 parts of polyether diol with the molecular weight of 1000 into a planetary stirrer, dehydrating in vacuum at 120 ℃ for 2 hours, then cooling to 60 ℃, adding 39 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of 3- (2-aminoethyl) -aminopropyl trimethoxy silane, 0.5 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activated powder and 0.06% of organic bismuth catalyst, and stirring for 2 hours in a vacuum state to obtain a component B.

Comparative example 2

Preparation of NCO-terminated polyurethane prepolymer:

Preparation of component A:

Preparation of the component B:

30 parts of polyether triol with the molecular weight of 500, 5 parts of polypropylene carbonate dihydric alcohol with the molecular weight of 3000 and 20 parts of polyether dihydric alcohol with the molecular weight of 1000 are added into a planetary stirrer, vacuum dehydration is carried out for 2 hours at the temperature of 120 ℃, then the temperature is reduced to 60 ℃, 38.5 parts of nano calcium carbonate, 0.5 part of vinyl trimethoxy silane, 2 parts of reflux adhesion promoter, 1 part of hydrophobic fumed silica, 3 parts of 4A-grade molecular sieve activating powder and 0.08 percent of ZC-E are added, and stirring is carried out for 2 hours under the vacuum state, so as to obtain the component B.

Test example

The polyurethane corner-block adhesives prepared in examples 2 to 6 and comparative examples 1 to 2 were subjected to shear strength property tests.

The shear strength detection method comprises the following steps: an aluminum anodic oxide sheet is used for preparing a glue layer lap joint sample sheet with the thickness of 0.2mm and the width of 12.5mm, and the sample sheet is maintained for 24 hours at the temperature of 23 ℃ and the humidity of 50 percent and then subjected to a shear performance test on an electronic universal testing machine, wherein the results are shown in table 1.

TABLE 1 polyurethane corner adhesive Performance test results

As can be seen from the above examples and comparative examples, the invention prepares the polyurethane corner adhesive by adding polypropylene carbonate polyol, and greatly improves the tensile and shear strength of the corner adhesive.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A high-shear strength two-component polyurethane corner adhesive comprises a component A and a component B in percentage by mass;

the component A comprises:

or the component A comprises:

the component B comprises:

2. the two-component polyurethane corner joint compound according to claim 1, wherein the NCO-terminated polyurethane prepolymer is obtained by polymerizing polypropylene carbonate diol and diisocyanate.

3. The two-component polyurethane corner joint compound according to claim 2, wherein the molecular weight of the polypropylene carbonate diol is 1000 to 3000;

the diisocyanate is diphenylmethane diisocyanate.

4. The two-component polyurethane corner adhesive according to claim 1, wherein the water scavenger A is one or more of an oxazolidine water scavenger and a molecular sieve activated powder;

5. The two-component polyurethane corner adhesive according to claim 1, wherein in the component B, the molecular weight of the polypropylene carbonate triol is 500-1000;

6. The two-part polyurethane corner joint compound of claim 5, wherein the polypropylene carbonate diol comprises 500 molecular weight polypropylene carbonate diol and 1000 molecular weight polypropylene carbonate diol;

7. the two-component polyurethane corner adhesive according to claim 1, wherein the adhesion promoter is obtained by condensation reaction of methyltriethoxysilane, gamma-aminopropyltriethoxysilane, and gamma-glycidoxypropyltrimethoxysilane.

8. The two-part polyurethane corner cube according to claim 1, wherein the catalyst is one or more of stannous octoate, di-n-butyltin dilaurate, organobismuth, and organozinc.

9. The preparation method of the two-component polyurethane corner-combining glue of any one of claims 1 to 8, comprising the following steps: