CN116333575A - Green multi-substrate universal rainproof and stain-resistant light-transmitting coating for solar power supply wireless communication system and preparation method thereof - Google Patents
Green multi-substrate universal rainproof and stain-resistant light-transmitting coating for solar power supply wireless communication system and preparation method thereof Download PDFInfo
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- CN116333575A CN116333575A CN202310308441.7A CN202310308441A CN116333575A CN 116333575 A CN116333575 A CN 116333575A CN 202310308441 A CN202310308441 A CN 202310308441A CN 116333575 A CN116333575 A CN 116333575A
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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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Abstract
A green multi-substrate universal rainproof and stain-resistant light-transmitting coating for a solar power supply wireless communication system and a preparation method thereof relate to the technical field of coatings, and are characterized in that firstly, nano silica sol and konjak glucomannan are utilized to prepare sol dispersion liquid in advance, then modified hydroxyethyl acrylate copolymer emulsion is utilized to obtain nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion, and finally, the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion are mixed with polyisocyanate and then coated to form the coating. The invention shows that the surface coating compatible with various base materials can be successfully prepared by controlling the particle size of the nano silica sol, a dispersion system, the preparation process of the konjak glucomannan composite modified sol and other conditions, and the invention has the characteristics of good base material binding force, strong micro-gap permeability, rain and pollution resistance, light transmission, safe and environment-friendly preparation process, green and simple coating process and the like.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a green multi-substrate universal rainproof and stain-resistant light-transmitting coating for a solar power supply wireless communication system and a preparation method thereof.
Background
With the rising of new energy industry, the distributed power supply represented by solar energy and energy storage system can be separated from the dependence on the power grid, and the independent, high-reliability and modularized easy-assembly performance are taken as cores, so that the distributed power supply becomes a preferable scheme for providing energy for the communication system. The solar energy and energy storage system combined with wireless communication plays an important role in temporary scenes of inconvenient wiring construction in polar regions, mountainous regions, lakes, seas and the like at banks, database machine rooms, military facilities, machine offices and the like in cities.
The existing solar power supply wireless communication system is greatly advanced towards full wireless in the aspects of installation, construction, equipment disassembly and reuse, and near-field wireless power supply is no longer a technical barrier. However, in practical application, the temporary scene of building the solar power supply wireless communication system is often severe in working environment, and serious loss is caused by problems of circuit faults, shell corrosion and the like caused by rain erosion. In addition, because of the complex source of pollutants in part of working scenes, the power generation efficiency of the solar panel surface is often reduced due to the fact that the surface is covered by the pollutants, and the tissue cleaning and sweeping are time-consuming and labor-consuming. Considering that the existing three-proofing coating has 3 problems:
a. the absorption is serious in the ultraviolet light wave band, and the power generation efficiency of the solar panel can be affected;
b. the coating cannot be universally used for various base materials and hardware connection joints of a solar power supply wireless communication system;
c. volatile VOC of the oily solvent has adverse effects on human body and environment.
Therefore, a green multi-substrate universal waterproof and anti-fouling transparent coating is needed to solve the above problems faced by the solar wireless communication system.
Disclosure of Invention
Aiming at the technical problems existing at present, the invention provides the green multi-substrate universal rainproof and stain-resistant light-transmitting coating for the solar power supply wireless communication system and the preparation method thereof, and the coating has the advantages of simple construction operation, proper cost, excellent light transmission, good waterproof and dustproof performances and the like, and is perfectly suitable for the solar power supply wireless communication system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a green multi-substrate universal rainproof and stain-resistant transparent coating for a solar power supply wireless communication system is prepared by firstly preparing sol dispersion liquid in advance by utilizing nano silica sol and konjak glucomannan, then utilizing modified hydroxyethyl acrylate copolymer emulsion to obtain nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion, and finally mixing the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion with polyisocyanate and coating to form the coating; wherein the dynamic viscosity of the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion is less than 1000 mPa.s, the hydroxyl value range is 100-140 mg KOH/g, the pH range is 3-5.5, and the mass solid content range is 35-55%.
A preparation method of a green multi-substrate universal rainproof and stain-resistant light-transmitting coating for a solar power supply wireless communication system comprises the following steps:
1) Placing the water/ethanol dispersion liquid of the nano silica sol into a beaker, adding konjak glucomannan powder, and adjusting the pH value of a reaction system to 7.5-9.5 by using ammonia water; maintaining the temperature for a period of time, and then homogenizing and stirring by high-speed shearing, emulsifying to form nano silica sol and konjac glucomannan to prepare sol dispersion liquid;
2) Centrifuging the dispersion liquid, removing the upper transparent clear liquid and the bottom sediment, taking the middle viscous liquid, and heating, rotationally evaporating and concentrating to obtain high-viscosity fluid, namely the konjac glucomannan modified nano silica sol high-viscosity fluid;
3) Stirring and mixing the konjak glucomannan modified nano silica sol high-viscosity fluid and the hydroxyethyl acrylate copolymer emulsion at a low speed, and obtaining the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion after the reaction is completed;
4) The nanometer sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion is used as the component A, and is mixed with polyisocyanate used as the component B and then is coated, so that the green multi-substrate universal rainproof and anti-fouling light-transmitting coating for the solar power supply wireless communication system is obtained.
As a preferable technical scheme of the preparation method, the invention comprises the following steps:
the water/ethanol dispersion liquid of the nano silica sol adopted in the step 1) has hydroxyl groups as the surface groups of the silica sol, the particle size of the silica sol is 2-200 nm, the solid content of the silica sol is 1-60%, and the ethanol in the dispersion liquid is as follows: the mass ratio of the water is 1:9-9:1.
In the step 1), the mass ratio of the nano silica sol dispersion liquid to the konjak glucomannan powder is 10:1-1000:1.
The konjak glucomannan powder adopted in the step 1) has the number average molecular weight of less than 120 ten thousand and the water content of less than 20 percent.
In the step 1), the pH is regulated, the temperature is controlled to be 10-55 ℃ and maintained for 5-20 min, then stirring and dispersing are carried out for 1-3 times at the stirring rotation speed of 3000-20000 r/min, the time for each time is 0.5-5 min, and the total reaction time is 0.5-15 min.
In the step 2), the middle-section viscous liquid is taken to remove ethanol and water by vacuum rotary evaporation at the temperature of 40-90 ℃, and the obtained konjak glucomannan modified nano silica sol high-viscosity fluid has the mass solid content of more than 30% and the ethanol content of less than 1%.
The main component of the hydroxyethyl acrylate copolymer emulsion adopted in the step 3) is a block type polymer, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate and polymerized polyfunctional polyester with hydroxyethyl acrylate as monomers, the dynamic viscosity is less than 500 mPa.s, the hydroxyl value range is 90-120 mg KOH/g, the pH range is 3-5.5, and the mass solid content range is 35-55%.
In the step 3), the mass ratio of the solid content between the high-viscosity fluid of the konjak glucomannan modified nano silica sol and the hydroxyethyl acrylate copolymer emulsion is 1:4-100, the reaction temperature is 5-30 ℃, the rotating speed is 60-150 r/min, and the reaction time is 5-300 min.
The polyisocyanate adopted in the step 4) has NCO content of 18-24%, viscosity of 800-3000 mPa.s, free HDI monomer of less than or equal to 0.1% and polyoxyethylene ether modified side chain.
The mass ratio of the component A to the component B in the step 4) is 2-10:1, and the components are mixed by manual stirring or mechanical stirring; after mixing, each time the wet film thickness is less than 75 mu m, the curing condition is that the temperature is more than 10 ℃, and when the humidity is less than 80%, natural drying or heating and drying are adopted, wherein the heating temperature is less than 120 ℃.
The invention prepares sol dispersion liquid by nano silica sol and konjak glucomannan, controls the uniform particle size by a centrifugal sedimentation separation method after high-speed stirring and dispersion, and obtains the aqueous sol with low ethanol content by vacuum concentration treatment. The aqueous sol modified hydroxyethyl acrylate copolymer emulsion is used as an A component of a two-component coating, is mixed with polyisocyanate used as a B component, and the controllable modified coating is obtained through the proportion of different modifying agents. Finally, the coating is coated outside the surface of the solar power supply wireless communication system hardware by a coating process, so that the rainproof, stain-resistant and light-transmitting surface coating is obtained. And a series of experimental results show that the surface coating compatible with various base materials can be successfully prepared by controlling the particle size of the nano silica sol, a dispersion system, the preparation process of the konjac glucomannan composite modified sol and other conditions, and the coating has the characteristics of good base material binding force, strong micro-gap permeability, rain resistance, stain resistance, light transmission, safe and environment-friendly preparation process, green and simple coating process and the like.
Compared with the prior art, the invention has the following advantages:
1) The invention realizes that the nano silica sol and natural polymer composite sol are utilized to modify hydroxyethyl acrylate copolymer emulsion, and then the hydroxyethyl acrylate copolymer emulsion is compounded with polyisocyanate to form the surface coating compatible with various base materials. The preparation conditions are green and mild, the process is stable and controllable, the whole preparation system is safe and environment-friendly, easy to construct, simple and convenient to operate, the conditions are easy to control, the product composition is easy to control, the product is uniform, and the preparation method is suitable for large-scale industrial production.
2) The invention adopts the konjak glucomannan natural polymer as the interfacial agent, realizes good compatibility to various base materials, does not add other VOC auxiliary substances in the preparation process, is environment-friendly, and is an environment-friendly synthesis process.
3) The invention solves the problems of compatibility, rain resistance, stain resistance and light transmission of various base materials faced by a solar wireless communication system, simultaneously realizes a water-based system, high ultraviolet transmittance, high light transmission, high adhesive force, high stain resistance, high waterproof capability, has the advantages of simple coating, mild coating condition, environmental protection and the like, and can be widely applied to the field of coating application of outdoor electronic systems under other complex conditions.
4) The green multi-substrate universal rainproof and pollution-resistant light-transmitting device is applicable to the surface of a solar power supply wireless communication system, the solar power supply wireless communication system comprises a solar cell panel, a power supply conversion module, a connecting wire, a communication module and the like, and the material of the solar power supply wireless communication system comprises PVC rubber, PC resin, ABS resin, polysilicon and the like, so that the product adaptability is wider.
Drawings
The following examples and drawings are provided to further describe the green multi-substrate universal rainproof and stain-resistant light-transmitting coating for solar power wireless communication system and the preparation method thereof
FIG. 1 is a diagram showing the actual results of painting the coating material obtained in example 1 on different substrates.
FIG. 2 is a graphical representation of the application of the coating prepared in example 2 to various substrates.
Fig. 3a, b are graphs of contact angle measurements of the coatings obtained in examples 1, 2, respectively.
Fig. 4 is a graph of adhesion test of the coating obtained in example 1.
FIG. 5 is a graph showing the water absorption of the coating obtained in example 1 (A1 and A2 correspond to 60 ℃ C. And room temperature conditions, respectively).
FIG. 6 is an SEM sectional view of the coating obtained in example 1.
FIG. 7 is a graph showing the comparison of the effect of the contamination resistance test.
Detailed Description
Example 1
1) 12g of nano silica sol dispersion liquid (particle diameter 20-40 nm, solid content 15% and ethanol/water 1:4) is weighed and placed in a reactor, then 1g of konjak glucomannan powder (number average molecular weight 100 ten thousand, water content less than 5%) is added, the mixture is subjected to water bath heat preservation for 10min at 20 ℃, and high-speed shearing, emulsifying and homogenizing stirring are carried out for 5min at 10000 r/min. Centrifuging the dispersion liquid after the reaction is completed, removing the upper transparent clear liquid and the bottom sediment, taking the middle viscous liquid, removing ethanol by rotary evaporation at 40 ℃, and obtaining the konjak glucomannan modified nano silica sol high-viscosity fluid by rotary evaporation until the solid content is 40% and the ethanol content is less than 0.5%.
2) 1g of konjak glucomannan modified nano-silica sol high-viscosity fluid is weighed and placed in a reactor, and then hydroxyethyl acrylate copolymer emulsion (dynamic viscosity is less than 500 mPa.s, hydroxyl value: 105mg KOH/g, pH range 4-5, mass solids content 48%) 9g, water bath at 20 deg.C for 10min, stirring slowly at 150r/min for 5min. And obtaining the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion after the reaction is completed.
3) Weighing 4g of nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion and 1g of polyisocyanate (NCO content 22%, viscosity: 2000 mPa.s, the free HDI monomer is less than or equal to 0.1 percent), the mixture is stirred for 3 minutes by hand and kept stand for 5 minutes, and the green multi-substrate universal rainproof and anti-fouling light-transmitting coating is obtained.
4) The green multi-substrate universal rainproof and stain-resistant light-transmitting coating is brushed on the surfaces of various substrates, the thickness of a wet film is 45 mu m, and the green multi-substrate universal rainproof and stain-resistant light-transmitting coating is formed by natural drying for 48 hours in sunny days at 20 ℃.
Example 2
1) 12g (mass ratio, the latter is the same) of nano silica sol dispersion liquid (particle diameter 50-80 nm, solid content 15% and ethanol/water 1:4) is weighed and placed in a reactor, then 1g of konjak glucomannan powder (number average molecular weight 100 ten thousand, water content less than 5%) is added, water bath at 40 ℃ is used for heat preservation for 10min, and high-speed shearing, emulsifying and homogenizing stirring are carried out for 15min at 5000 r/min. Centrifuging the dispersion liquid after the reaction is completed, removing the upper transparent clear liquid and the bottom sediment, taking the middle viscous liquid, removing ethanol by rotary evaporation at 80 ℃, and obtaining the konjak glucomannan modified nano silica sol high-viscosity fluid by rotary evaporation until the solid content is 40% and the ethanol content is less than 0.5%.
2) 1g of konjak glucomannan modified nano-silica sol high-viscosity fluid is weighed and placed in a reactor, and then hydroxyethyl acrylate copolymer emulsion (dynamic viscosity is less than 500 mPa.s, hydroxyl value: 105mg KOH/g, pH range 4-5, mass solids content 48%) 5g, water bath at 20 deg.C for 10min, stirring slowly at 120r/min for 10min. And obtaining the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion after the reaction is completed.
3) Weighing 4g of nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion and 1g of polyisocyanate (NCO content 22%, viscosity: 2000 mPa.s, the free HDI monomer is less than or equal to 0.1 percent), the mixture is stirred for 3 minutes by hand and kept stand for 5 minutes, and the green multi-substrate universal rainproof and anti-fouling light-transmitting coating is obtained.
4) The green multi-substrate universal rainproof and stain-resistant transparent coating is brushed on the surfaces of various substrates, the thickness of a wet film is 30 mu m, the green multi-substrate universal rainproof and stain-resistant transparent coating is naturally dried for 2 hours in sunny days at 20 ℃, and the green multi-substrate universal rainproof and stain-resistant transparent coating is cured for 30 minutes at 80 ℃ to form the rainproof and stain-resistant transparent coating.
FIGS. 1 and 2 are pictorial views showing the coating materials prepared in examples 1 and 2, respectively, applied to different substrates. The substrates in fig. 1a and b correspond to resin and glass, respectively, and the substrates in fig. 2a and b correspond to wood and stone, respectively. As can be seen from fig. 1 and 2, the coating prepared by the invention can be uniformly and evenly distributed on resin, glass, wood and stone, and has excellent adhesive force.
The coatings prepared in examples 1 and 2 were respectively coated on glass substrates, and the contact angle test was performed on the prepared coatings, and as shown in fig. 3, the coatings were found to have a contact angle of more than 90 degrees and good surface self-cleaning ability.
The paint prepared in example 1 was applied to a glass substrate and subjected to an adhesion test, and as a result, as shown in fig. 4, it can be seen that the cross-cut adhesion was the best grade 0.
The coating prepared in example 1 was applied to a glass substrate, dried, and then the coating was peeled off, and the water absorption rate (at normal temperature, 60 ℃) of the coating was measured, and as shown in fig. 5, it was found that the coating had extremely low water absorption rate and reached a stable value quickly, remained stable for a period of time of up to 70 hours or more, and thus had good outdoor water repellency.
The coating prepared in example 1 was painted on a glass substrate, the coating was peeled off after drying, and then observed by a scanning electron microscope, and as shown in fig. 6, it was found that spherical silica sol was uniformly distributed and spherical functional particles were complete.
The paint (c), the white bidding paint (a) and the transparent bidding paint (b) prepared in the embodiment 1 are respectively coated on stone substrates, and then are respectively coated with ink (carbon black), carbon black, sesame oil and blue ink for pollution resistance test, and the comparison photographs after pollution and cleaning are shown in fig. 7, so that the paint prepared in the invention has the pollution resistance of far-exceeding bidding.
The coatings prepared in examples 1 and 2 were applied to surfaces of polysilicon, ABS resin, PC-ABS resin and glass, and the hardness of the coatings was measured, and the results are shown in Table 1.
TABLE 1
It can be seen from table 1 that a coating with a higher hardness can be obtained on a variety of substrates, with a certain scratch resistance.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (10)
1. A green multi-substrate universal rainproof and stain-resistant light-transmitting coating for a solar power supply wireless communication system is characterized in that firstly, a sol dispersion liquid is prepared by utilizing nano silica sol and konjak glucomannan in advance, then a nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion is obtained by utilizing a modified hydroxyethyl acrylate copolymer emulsion thereof, and finally, the coating is formed by mixing the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion with polyisocyanate and then coating the mixture; wherein the dynamic viscosity of the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion is less than 1000 mPa.s, the hydroxyl value range is 100-140 mg KOH/g, the pH range is 3-5.5, and the mass solid content range is 35-55%.
2. A method for preparing the green multi-substrate universal rainproof and stain resistant light-transmitting coating for a solar powered wireless communication system as claimed in claim 1, which is characterized by the following steps:
1) Placing the water/ethanol dispersion liquid of the nano silica sol into a beaker, adding konjak glucomannan powder, and adjusting the pH value of a reaction system to 7.5-9.5 by using ammonia water; maintaining the temperature for a period of time, and then homogenizing and stirring by high-speed shearing, emulsifying to form nano silica sol and konjac glucomannan to prepare sol dispersion liquid;
2) Centrifuging the dispersion liquid, removing the upper transparent clear liquid and the bottom sediment, taking the middle viscous liquid, and heating, rotationally evaporating and concentrating to obtain high-viscosity fluid, namely the konjac glucomannan modified nano silica sol high-viscosity fluid;
3) Stirring and mixing the konjak glucomannan modified nano silica sol high-viscosity fluid and the hydroxyethyl acrylate copolymer emulsion at a low speed, and obtaining the nano sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion after the reaction is completed;
4) The nanometer sol and konjak glucomannan composite sol modified hydroxyethyl acrylate copolymer emulsion is used as the component A, and is mixed with polyisocyanate used as the component B and then is coated, so that the green multi-substrate universal rainproof and anti-fouling light-transmitting coating for the solar power supply wireless communication system is obtained.
3. The process according to claim 2, wherein the aqueous/alcoholic dispersion of nanosilicon sol used in step 1) has hydroxyl groups on the surface of the silica sol, a particle size of 2 to 200nm, a solids content of 1 to 60%, and ethanol in the dispersion: the mass ratio of the water is 1:9-9:1; the number average molecular weight of the konjak glucomannan powder is less than 120 ten thousand, and the water content is less than 20%.
4. The preparation method according to claim 2, wherein the mass ratio of the nano silica sol dispersion to the konjac glucomannan powder in the step 1) is 10:1 to 1000:1.
5. The preparation method according to claim 2, wherein the temperature is controlled to be 10-55 ℃ for 5-20 min after the pH is regulated in the step 1), and then the mixture is stirred and dispersed for 1-3 times at a stirring speed of 3000-20000 r/min, wherein the time for each time is 0.5-5 min, and the total reaction time is 0.5-15 min.
6. The preparation method of claim 2, wherein the middle viscous liquid obtained in the step 2) is subjected to vacuum rotary evaporation at the temperature of 40-90 ℃ to remove ethanol and water, so that the konjak glucomannan modified nano silica sol high-viscosity fluid is obtained, wherein the mass solid content is more than 30%, and the ethanol content is less than 1%.
7. The process according to claim 2, wherein the hydroxyethyl acrylate copolymer emulsion used in step 3) has a solid content of a block type polymer, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate and a polymer type polyfunctional polyester having a monomer of hydroxyethyl acrylate, a kinetic viscosity of < 500 mPa.s, a hydroxyl value of 90 to 120mg KOH/g, a pH of 3 to 5.5 and a mass solids content of 35 to 55%.
8. The preparation method of claim 2, wherein the mass ratio of the solid content of the konjak glucomannan modified nano-silica sol high-viscosity fluid and the hydroxyethyl acrylate copolymer emulsion in the step 3) is 1:4-100, the reaction temperature is 5-30 ℃, the rotating speed is 60-150 r/min, and the reaction time is 5-300 min.
9. The process according to claim 2, wherein the polyisocyanate used in step 4) has an NCO content of 18 to 24%, a viscosity of 800 to 3000 mPa.s and a free HDI monomer of not more than 0.1% and a polyoxyethylene ether-modified side chain.
10. The preparation method according to claim 2, wherein the mass ratio of the component A to the component B in the step 4) is 2-10:1, and the components are mixed by manual stirring or mechanical stirring; after mixing, each time the wet film thickness is less than 75 mu m, the curing condition is that the temperature is more than 10 ℃, and when the humidity is less than 80%, natural drying or heating and drying are adopted, wherein the heating temperature is less than 120 ℃.
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