CN114940864A

CN114940864A - Infant garden wall surface based on novel erasable coating

Info

Publication number: CN114940864A
Application number: CN202210501205.2A
Authority: CN
Inventors: 袁玉; 蒋静宇; 陈林; 徐进
Original assignee: Nantong Construction Design And Research Institute Co ltd
Current assignee: Nantong Construction Design And Research Institute Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-08-26
Anticipated expiration: 2042-05-10
Also published as: CN114940864B

Abstract

The application relates to a kindergarten wall based on novel erasable coating relates to the field of coating, including the wall body with can wipe the coating, can wipe the coating will wipe coating in wall body surface obtains, can wipe the coating and include the component of following mass fraction: 140-160 parts of 2, 4-toluene diisocyanate; trimethylolpropane 210-240; 17-22 parts of a waterproof agent; 12-16 parts of a light absorbent; 2-3 parts of a defoaming agent; 3-5 parts of a leveling agent; 6-8 parts of a chain extender; 160 portions and 180 portions of deionized water. This application adds the light absorbent in erasable coating, can effectively reduce the glossiness of coating, and then the reducible effect of often seeing the produced visual fatigue degree of wall.

Description

Infant garden wall surface based on novel erasable coating

Technical Field

The application relates to the field of coatings, in particular to a kindergarten wall surface based on novel erasable coatings.

Background

Kindergarten is the preschool education institution that carries out nursing and education to infant in a set, admits three to six years old infant usually, and the culture of children in kindergarten includes writing and drawing, and lively children can have the action of writing on the wall, and general wall is painted by the pen after, the clearance is also difficult.

The Chinese patent application with publication number CN102443345A discloses a waterborne polyurethane wall paint and a preparation method thereof, which is physically prepared from the following components in percentage by weight: a component A: 50-60% of a polyol resin dispersion; 0.6-0.8% of a dispersant; 0.5-0.7% of a wetting and leveling agent; 0.3-0.6% of defoaming agent; 0.4-0.8% of rheological additive; 0.1-0.15% of a bactericide; 1.5-2.5% of a film-forming assistant; a proper amount of pH regulator; 10-20% of water and 20-30% of pigment and filler; b, component B: the curing agent component comprises 5-10: 1 of the component A and the component B in weight ratio; the waterborne polyurethane wall paint has excellent performance, is environment-friendly, easy to clean, stain-resistant, wear-resistant and weather-resistant, and has excellent chemical resistance, so that the requirements of the waterborne polyurethane wall paint in the application fields of schools, kindergartens, hospitals, pharmaceutical factories, building outer walls and the like are met.

However, after the brightness of the wall paint is too high due to the irradiation of light after writing on the wall surface, children may feel visual fatigue by frequently seeing the bright wall surface, and therefore, it is necessary to develop a rewritable coating with reduced glossiness.

Disclosure of Invention

In order to reduce the gloss of the coating, the present application provides a kindergarten wall surface based on a novel erasable coating.

The application provides a kindergarten's wall adopts following technical scheme based on novel erasable coating:

the utility model provides a kindergarten wall based on novel erasable coating, includes the wall body and can wipe the coating, can wipe the coating and coat in the wall body surface obtains, can wipe the coating and include the component of following mass fraction:

140 portions of 2, 4-toluene diisocyanate

Trimethylolpropane 210-240-

17-22 parts of waterproofing agent

12-16 parts of light absorbent

2-3 parts of defoaming agent

3-5 parts of flatting agent

6-8 parts of chain extender

160 portions and 180 portions of deionized water.

The light absorbing agent can enable the paint to have a matte effect, and after the paint is coated on the wall surface, the wall surface can have a soft effect, so that indoor light is softer, and the phenomenon that children feel dull when looking at the wall surface for a long time can be effectively reduced; due to the addition of the waterproof agent, after the coating is wiped for many times, on one hand, the wall body cannot be damaged due to water stain penetrating through the coating, and on the other hand, the use durability of the polyurethane erasable coating is improved.

Preferably, the preparation method of the light absorbent is as follows:

mixing dimethylolpropionic acid methyl ester, isophorone diisocyanate and a polymerization inhibitor, heating for reaction, cooling to room temperature, adding hydroxyethyl acrylate, adding deionized water after reaction, and shearing to obtain the light absorbent.

The isophorone diisocyanate and methyl dimethylolpropionate react to form a prepolymer, the prepolymer enables the surface of the coating to form nano-scale microspheres, the microsphere structure enables the surface of the coating to have low glossiness and high light transmittance, the water resistance of polyurethane can be improved by acrylate, the prepolymer is in an exothermic reaction during synthesis, a double-bond polymerization side reaction can possibly occur at high temperature, and the polymerization inhibitor can reduce the occurrence of the side reaction.

Preferably, the mass ratio of the dihydroxy methyl methacrylate to the hydroxyethyl acrylate is 1 (1-2).

The stability of the light absorbent can be improved by controlling the mass ratio between methyl dimethylolpropionate and hydroxyethyl acrylate within the above range.

Preferably, the polymerization inhibitor is hydroquinone.

After hydroquinone is oxidized into quinone structure in the reaction, the polymerization between double bonds can be effectively reduced, thereby reducing the generation of side reactions.

Preferably, the reaction temperature is 65 to 75 ℃.

The temperature after the temperature rise is controlled within the range, so that the stability of the light absorbent can be improved.

Preferably, the water repellent comprises isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol.

The polypropylene glycol and isophorone diisocyanate react to generate polymeric molecules, the molecular arrangement in the polymeric molecules is tighter, so that the movement of water vapor among molecules of the whole system can be reduced, a good waterproof effect is achieved, the 1, 4-butanediol enables the molecular arrangement in the polymeric molecules to be denser, the movement of water vapor among the polymer molecules is hindered, and a good waterproof effect can be achieved.

Preferably, the mass ratio of the isophorone diisocyanate to the polypropylene glycol to the 1, 4-butanediol is 1 (0.2-0.5) to (0.6-0.8).

The waterproof performance of the waterproof agent can be improved by controlling the mass ratio of the isophorone diisocyanate, the polypropylene glycol and the 1, 4-butanediol within the range.

Preferably, the chain extender is maleic acid.

Preferably, the defoamer is polydimethylsiloxane.

The polydimethylsiloxane can reduce the surface tension of the coating and reduce the formation of foam in the stirring process of the coating, thereby improving the stability of the coating.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the light absorbing agent is added into the coating, so that the wall surface can have a soft effect, the glossiness is reduced, and indoor light is softer; the waterproof effect of the coating can be improved by adding the waterproof agent;

2. after isophorone diisocyanate and methyl dimethylolpropionate react, a prepolymer is generated, and after the coating is coated, nano-scale microspheres are formed on the surface of the coating, and the glossiness of the coating surface is reduced due to the microsphere structure, so that the wall is softer;

the chain extender 1, 4-butanediol is added into the coating, so that the chain extension can be performed on the polymer molecules on one hand, the performance of the coating is improved, and on the other hand, the molecular arrangement of the polymer molecules is denser, so that the movement of water vapor between the polymer molecules is hindered, and the coating has good waterproof performance.

Drawings

Fig. 1 is a cross-sectional view of a kindergarten wall based on a novel rewritable coating in an embodiment of the present application.

Description of reference numerals: 1. a wall surface body; 2. the coating can be wiped.

Detailed Description

The present application is further described in detail with reference to the following embodiments, in which the wall surface includes a wall surface body 1 and an erasable coating 2, and the erasable coating 2 is obtained by applying an erasable coating on the surface of the wall surface body 1.

Example 1

Weighing 12g of isophorone diisocyanate, dimethylol methyl propionate and hydroxyethyl acrylate according to the mass ratio of 1:1: 1; mixing weighed methyl dimethylolpropionate and isophorone diisocyanate, adding 3g of polymerization inhibitor, heating to 65 ℃, reacting for 2h to obtain a prepolymer, cooling the prepolymer to room temperature, adding hydroxyethyl acrylate into the prepolymer, reacting for 3h, adding 20ml of deionized water, and shearing at the speed of 3000r/min for 15min to obtain a light absorbent; wherein the polymerization inhibitor is hydroquinone.

Weighing 17g of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol according to the mass ratio of 1:0.2: 0.8; the preparation method comprises the steps of dehydrating weighed polypropylene glycol, mixing the dehydrated polypropylene glycol with weighed isophorone diisocyanate, reacting for 2.5 hours at 75 ℃ to obtain polymeric molecules, adding an appropriate amount of acetone into the polymeric molecules for dilution, adding weighed 1, 4-butanediol after the polymeric molecules are cooled to room temperature, reacting for 3 hours at 75 ℃, distilling under reduced pressure after the reaction is finished, removing residual acetone, and adding an appropriate amount of absolute ethyl alcohol to obtain the waterproof agent.

Weighing 140g of 2, 4-toluene diisocyanate, 210g of trimethylolpropane and 160mL of deionized water, mixing to obtain a polyurethane system, adding the light absorbing agent, the waterproofing agent, 2g of defoaming agent, 3g of flatting agent and 6g of chain extender into the polyurethane system, and fully stirring for 2 hours to ensure that the system is uniform, thus obtaining the matte erasable coating; wherein the defoaming agent is selected from polydimethylsiloxane, the flatting agent is selected from polymethylphenylsiloxane, and the chain extender is selected from maleic acid.

Example 2

Weighing 16g of isophorone diisocyanato, dimethylol methyl propionate and hydroxyethyl acrylate according to the mass ratio of 1:1: 2; mixing weighed methyl dimethylolpropionate with isophorone diisocyanate, adding 5g of polymerization inhibitor, heating to 75 ℃, reacting for 2h to obtain a prepolymer, cooling the prepolymer to room temperature, adding hydroxyethyl acrylate into the prepolymer, reacting for 3h, adding 30ml of deionized water, and shearing at 3000r/min for 15min to obtain a light absorbent; wherein the polymerization inhibitor is hydroquinone.

22g of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol are weighed according to the mass ratio of 1:0.5: 0.6; dehydrating the weighed polypropylene glycol, bonding the dehydrated polypropylene glycol with the weighed isophorone diisocyanate, reacting for 2.5 hours at 75 ℃ to obtain polymeric molecules, adding a proper amount of acetone into the polymeric molecules for dilution, adding the weighed 1, 4-butanediol after the polymeric molecules are cooled to room temperature, reacting for 3 hours at 75 ℃, distilling under reduced pressure after the reaction is finished, removing residual acetone, and adding a proper amount of absolute ethyl alcohol to obtain the waterproof agent.

Weighing 160g of 2, 4-toluene diisocyanate, 240g of trimethylolpropane and 240mL of deionized water, mixing to obtain a polyurethane system, adding the light absorbing agent, the waterproofing agent, 3g of defoaming agent, 5g of flatting agent and 8g of chain extender into the polyurethane system, and fully stirring for 2 hours to ensure that the system is uniform, thus obtaining the matte erasable coating; wherein, the defoaming agent is selected from polydimethylsiloxane, the flatting agent is selected from polymethylphenylsiloxane, and the chain extender is selected from maleic acid.

Example 3

Weighing 14g of isophorone diisocynate, dimethylol methyl propionate and hydroxyethyl acrylate according to the mass ratio of 1:1: 1.5; mixing weighed methyl dimethylolpropionate and isophorone diisocyanate, adding 4g of polymerization inhibitor, heating to 70 ℃, reacting for 2h to obtain a prepolymer, cooling the prepolymer to room temperature, adding hydroxyethyl acrylate into the prepolymer, reacting for 3h, adding 25ml of deionized water, and shearing at the speed of 3000r/min for 15min to obtain a light absorbent; wherein the polymerization inhibitor is hydroquinone.

Weighing 20g of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol according to the mass ratio of 1:0.4: 0.7; dehydrating the weighed polypropylene glycol, bonding the dehydrated polypropylene glycol with the weighed isophorol diisocyanate, reacting for 2.5 hours at 75 ℃ to obtain polymeric molecules, adding an appropriate amount of acetone into the polymeric molecules for dilution, adding the weighed 1, 4-butanediol after the polymeric molecules are cooled to room temperature, reacting for 3 hours at 75 ℃, distilling under reduced pressure after the reaction is finished, removing residual acetone, and then adding an appropriate amount of absolute ethyl alcohol to obtain the waterproof agent.

Weighing 150g of 2, 4-toluene diisocyanate, 225g of trimethylolpropane and 200mL of deionized water, mixing to obtain a polyurethane system, adding the light absorbing agent, the waterproof agent, 2g of the defoaming agent, 4g of the leveling agent and 7g of the chain extender into the polyurethane system, and fully stirring for 2 hours to ensure that the system is uniform, thus obtaining the matte erasable coating; wherein, the defoaming agent is selected from polydimethylsiloxane, the flatting agent is selected from polymethylphenylsiloxane, and the chain extender is selected from maleic acid.

Example 4

Example 4 based on example 3, example 4 only differs from example 3 in that: in the preparation of the light absorbent in example 4, the mass ratio of the isophorone diisocyanate, the dimethylol methyl propionate and the hydroxyethyl propionate is 1:2: 1.5.

Example 5

Example 5 based on example 3, example 5 only differs from example 3 in that: in the preparation of the light absorbent in example 5, the mass ratio of the isophorone diisocyanate, the dimethylol methyl propionate and the hydroxyethyl propionate is 1:1: 3.

Example 6

Example 6 example 3 is referenced, and example 6 differs from example 3 only in that: in the preparation of the water repellent in example 6, the mass ratio of isophorone diisocyanate, polypropylene glycol, and 1, 4-butanediol was measured to be 1:0.7: 0.7.

Example 7

Example 7 based on example 3, example 7 differs from example 3 only in that: in the preparation of the water repellent in example 7, the mass ratio of isophorone diisocyanate, polypropylene glycol, and 1, 4-butanediol was measured to be 1:0.4: 1.

Example 8

Example 8 example 3 is referenced, and example 8 differs from example 3 only in that: in the preparation of the waterproofing agent in example 8, the mass ratio of the isophorone diisocyanate, the polypropylene glycol, and the 1, 4-butanediol is 1.5: 0.4: 0.7.

comparative example 1

Comparative example 1 is based on example 3, and comparative example 1 differs from example 3 only in that: in comparative example 1, polypropylene glycol was replaced with methyl methacrylate.

Comparative example 2

Comparative example 2 based on example 3, comparative example 2 differs from example 3 only in that: in comparative example 2, 1, 4-butanediol was replaced with dimethylolbutyric acid.

Comparative example 3

Comparative example 3 based on example 3, comparative example 3 differs from example 3 only in that: comparative example 3 methyl dimethylolpropionate was replaced with polytetrahydrofuran diol.

Performance test

The matte polyurethane coatings of examples 1-8, comparative examples 1-3 were sampled and the following coating performance tests were performed:

(1) gloss Property test of coating

Selecting GB/T13891 plus 2008 determination method of specular gloss of architectural finishing material as a standard, testing each sample for 3 times, taking an average value after measurement, and filling the measurement result into table 1;

(2) test of Water resistance of coating

Selecting GB/T18244-2000 building waterproof material aging test method as a standard, testing each sample for 3 times, taking an average value after measurement, and filling the measurement result into table 1;

(3) abrasion resistance test of coating

The GB/T1768-2006 method for measuring the abrasion resistance of the colored paint and the varnish is selected as a standard, the samples are tested for 3 times per minute, the average value is taken after the measurement, and the measurement result is filled in the table 1.

TABLE 1

As can be seen from Table 1, the gloss of the coatings of examples 1-3 is below 5, so that the matte polyurethane coating prepared by the method has a good soft light effect; the water impermeability test results of examples 1-3 are all water impermeability test results, so that the matte polyurethane coating prepared by the method has a good waterproof effect; the wear resistance of the examples 1-3 is below 0.0300g, so that the matte polyurethane coating prepared by the method has a good wear resistance effect.

As can be seen from table 1, example 3 differs from example 4 in that: the mass ratio of isophorone diisocyanate to methyl dimethylolpropionate to hydroxyethyl acrylate in example 3 is 1:1:1.5, the mass ratio of isophorone diisocyanate to methyl dimethylolpropionate to hydroxyethyl acrylate in example 4 is 1:2:1.5, the gloss of example 3 is 3.7, the gloss of example 4 is 6.4, and the gloss of example 4 is improved compared with example 3, which is probably because the content of hydrophilic groups in the prepolymer is increased after the ratio of methyl dimethylolpropionate is increased, and the polyurethane prepolymer emulsion is dispersed into particles with smaller particle size in water, so that a relatively flat film is formed during film formation, the convex structure is not obvious, and the gloss is improved by a smooth surface, so the gloss of example 4 is improved.

As can be seen from table 1, example 3 differs from example 5 in that: the mass ratio of isophorone diisocyanate to methyl dimethylolpropionate to hydroxyethyl acrylate in example 3 is 1:1:1.5, the mass ratio of isophorone diisocyanate to methyl dimethylolpropionate to hydroxyethyl acrylate in example 4 is 1:1:3, the gloss of example 3 is 3.7, the gloss of example 5 is 7.2, and the gloss of example 5 is improved compared with example 3, which is probably because the emulsion stability is affected after the proportion of hydroxyethyl acrylate is improved, and the emulsion breaking phenomenon is serious due to a large amount of hydroxyethyl acrylate, so that the particle size is reduced, the surface is smooth during film forming, and the gloss is improved.

The abrasion resistance of example 3 was 0.019g, the abrasion resistance of example 5 was 0.065g, and the abrasion resistance of example 5 was lower than that of example 3, probably because the excessive hydroxyethyl acrylate was bonded to trimethylolpropane in the system, and the content of soft segment in the molecular chain was increased, so that the density of rigid segment in the system was decreased, the stability of the system was decreased, and the abrasion resistance was also decreased.

As can be seen from table 1, the difference between example 3 and example 6 is that: the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 3 is 1:0.4:0.7, the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 6 is 1:0.7:0.7, the waterproof performance of example 3 is detected as water impermeability, the waterproof performance of example 6 is detected as sample wetting, the waterproof performance of example 6 is reduced compared with example 3, probably because molecules are difficult to be arranged in an aggregation manner after the content of polypropylene glycol is increased, the movement of water vapor molecules among polymer molecules is difficult to be hindered, the association effect of water vapor molecules and hydrogen bonds is difficult to be improved after the content of hydrogen bonds is reduced, so that the movement of water vapor molecules among polymer molecules is difficult to generate a blocking effect, and the waterproof performance of the coating is reduced, the waterproof performance of example 6 is degraded.

The abrasion resistance of example 3 was 0.019g, the abrasion resistance of example 6 was 0.068g, and the abrasion resistance of example 6 was lower than that of example 3, probably because the amount of the organic synthetic intermediate obtained by combining hydroxyethyl acrylate with trimethylolpropane in the system was decreased after the ratio of polypropylene glycol was increased, the adhesion and hardness of the coating were decreased, and the abrasion resistance of the coating was decreased.

As can be seen from table 1, the difference between example 3 and example 7 is that: the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 3 is 1:0.4:0.7, the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 7 is 1:0.4:1, the result of the water impermeability test in example 3 is that no water seeps, the result of the water impermeability test in example 7 is that the sample has a wetting phenomenon, and the waterproof performance of example 7 is reduced compared with example 3, probably because the content of bubbles in the system is increased significantly, the viscosity of the system is too large, bubbles are difficult to remove, the stability of the whole system is reduced, the effect of blocking water vapor is also reduced, and the waterproof performance of the coating is reduced, so the waterproof performance of example 7 is reduced.

The reason why the abrasion resistance of example 3 was 0.019g and the abrasion resistance of example 7 was 0.064g was that the abrasion resistance of example 7 was lower than that of example 3, probably because the viscosity of the whole system was too high and the stability of the whole system was lowered after the content of 1, 4-butanediol was too large, the hardness and mechanical properties of the coating were both lowered, and the abrasion resistance was lowered.

As can be seen from table 1, the difference between example 3 and example 8 is that: the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 3 is 1:0.4:0.7, the mass ratio of isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol in example 8 is 1..5:0.4:0.7, the waterproof performance of example 3 is detected to be water-proof, the waterproof performance of example 8 is detected to be sample wetting, and the waterproof performance of example 8 is reduced compared with example 3, which is probably because the ratio of 1, 4-butanediol is reduced after the ratio of isophorone diisocyanate is increased, molecules in the system are difficult to be closely arranged, water vapor molecules are easy to move between polymers, so that the water vapor molecules easily pass through the system, and the waterproof performance of example 8 is reduced.

The abrasion resistance of example 3 is 0.019g, the abrasion resistance of example 8 is 0.057g, and the abrasion resistance of example 8 is reduced compared with example 3, which is probably because the proportion of isophorone diisocyanate is increased, the isocyanate group in the system is more in the system, and the steric hindrance of the isocyanate group is larger, so the interaction between the system and the polar group on the surface of the group is smaller, the bonding strength of the system is not high, the interaction between molecules is difficult to be improved, the mechanical property of the coating is reduced, and the abrasion resistance is also reduced.

As can be seen from table 1, example 3 differs from comparative example 1 in that: comparative example 1 the polypropylene glycol was replaced with methyl methacrylate, and the waterproofing performance of comparative example 1 was reduced compared to example 3, probably because the crosslinking degree of the system itself was reduced, the compactness of the coating was reduced, and moisture was more easily permeated into the inside of the membrane body and through the system, and the waterproofing performance of comparative example 1 was reduced.

The abrasion resistance of example 3 was 0.019g and that of comparative example 1 was 0.054g, and the abrasion resistance of comparative example 1 was reduced compared to example 3, probably because the mechanical properties of the system were reduced and the abrasion resistance of comparative example 1 was reduced because methyl methacrylate decreased the density of the system, thereby decreasing the hardness of the system film.

As can be seen from table 1, example 3 differs from comparative example 2 in that: comparative example 2 in which 1, 4-butanediol was replaced with dimethylolbutyric acid, comparative example 2 was inferior to example 3 in water-impermeability, which is probably due to the exothermic reaction between isocyanate and hydroxyl groups and the uneven distribution of dimethylolbutyric acid in the system, which worsened the overall stability of the system and the effect of blocking water vapor, thus reducing the water-impermeability.

The abrasion resistance of example 3 is 0.019g, the abrasion resistance of comparative example 2 is 0.052g, and the abrasion resistance of comparative example 2 is reduced compared with that of example 3, which is probably because the interaction between systems is reduced after the system stability is reduced, the viscosity strength of the system is difficult to be improved, the mechanical property of the coating is reduced, and the abrasion resistance is also reduced.

As can be seen from table 1, example 3 differs from comparative example 3 in that: comparative example 3 in which methyl dimethylolpropionate was replaced with polytetrahydrofuran diol, comparative example 3 showed an increase in gloss compared to example 3, probably because the emulsion particles formed from polytetrahydrofuran diol were soft and difficult to form significantly convex particles, and the surface of the whole system was relatively flat and smooth, and thus the gloss was increased.

The present embodiment is merely illustrative, and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope and spirit of the present invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a kindergarten wall based on novel erasable coating which characterized in that: the wall surface comprises a wall surface body and an erasable coating, wherein the erasable coating is obtained by coating an erasable coating on the surface of the wall surface body, and the erasable coating comprises the following components in parts by mass:

140 portions of 2, 4-toluene diisocyanate

Trimethylolpropane 210-240-

17-22 parts of waterproofing agent

12-16 parts of light absorbent

2-3 parts of defoaming agent

3-5 parts of flatting agent

6-8 parts of chain extender

160 portions and 180 portions of deionized water.

2. A kindergarten wall surface based on novel erasable paint according to claim 2, characterized in that: the preparation method of the light absorbent comprises the following steps:

3. A kindergarten wall surface based on novel erasable paint according to claim 2, characterized in that: the mass ratio of the dihydroxy methyl methacrylate to the hydroxyethyl acrylate is 1 (1-2).

4. A kindergarten wall surface based on novel erasable paint according to claim 2, characterized in that: the polymerization inhibitor is hydroquinone.

5. The new type of erasable paint based kindergarten wall surface as claimed in claim 2, wherein: the reaction temperature is 65-75 ℃.

6. The kindergarten wall surface based on the novel erasable paint as claimed in claim 1, characterized in that the waterproof agent comprises isophorone diisocyanate, polypropylene glycol and 1, 4-butanediol.

7. The kindergarten wall surface based on novel erasable paint of claim 6, characterized in that: the mass ratio of the isophorone diisocyanate to the polypropylene glycol to the 1, 4-butanediol is 1 (0.2-0.5) to 0.6-0.8.

8. The kindergarten wall surface based on novel erasable paint of claim 1, characterized in that: the chain extender is maleic acid.

9. The kindergarten wall surface based on novel erasable paint of claim 1, characterized in that: the defoaming agent is polydimethylsiloxane.