CN116640501A - Preparation and experimental method of high-hardness polyurethane foam skinning coating - Google Patents

Abstract

The application relates to the technical field of high polymer materials, and discloses a preparation and experimental method of a high-hardness polyurethane foam skinning coating, which comprises the following materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylic ester, waterborne polyurethane, a leveling agent, modified palygorskite, a catalyst, hydrated neodymium carbonate, a stripping aid, matting powder, a coupling agent, a thickening agent and a pH regulator. The experimental result shows that the formaldehyde removal rate of the polyurethane foam skinning coating is reduced when the pH value is biased to be neutral, and the coating drying time is effectively reduced, so that the material proportion influences the product use effect of the polyurethane foam skinning coating, the control of the pH value is also important in the preparation process of the polyurethane foam skinning coating, the pH value also influences the product effect after the preparation of the polyurethane foam skinning coating, and a new thought and improvement point is provided for the preparation of the polyurethane foam skinning coating.

Description

Preparation and Experimental Method of a High Hardness Polyurethane Foam Skin Coating

technical field

The invention relates to the technical field of polymer materials, in particular to a preparation and experiment method of a high-hardness polyurethane foam crust coating.

Background technique

Rigid foam is made of synthetic resin as the main raw material, under the action of a variety of additives, such as catalysts, etc., by mixing and spraying under high pressure. There are two types of polyurethane foam, soft and non-skinned. The soft foam is open and the hard foam is closed-cell structure; Polyurethane soft foam is often used in sofa furniture, pillows, cushions, toys, clothing and sound insulation linings. It is a new type with heat preservation and waterproof functions. Half, is the lowest thermal conductivity of all. Mainly used in buildings, roof waterproof and thermal insulation integration, cold storage thermal insulation, pipeline thermal insulation materials, construction, refrigerated trucks and cold storage thermal insulation materials, polyurethane foam crust coating often affects the pH value of the product coating during preparation and use. The final use effect of the layer is greatly affected. Therefore, this application now proposes a preparation and experimental method of a high-hardness polyurethane foam skin coating to optimize the preparation process of the polyurethane foam skin coating.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides a preparation and experimental method of a high-hardness polyurethane foam skin coating, which has the advantages of optimizing the preparation process of the polyurethane foam skin coating and improving the use effect of the product.

(2) Technical solution

In order to achieve the above object, the present invention provides the following technical solutions: a high-hardness polyurethane foam crust coating, comprising the following materials in parts by mass:

75-85 parts of polyether polyol

Toluene diisocyanate 80-100 parts

60-80 parts of polyether polyol

Acrylate 15-20 parts

150-200 parts of water-based polyurethane

Leveling agent 5-6 parts

Modified palygorskite 10-12 parts

Catalyst 5-6 parts

25-30 parts of hydrated neodymium carbonate

3-4 parts of peeling aid

Matting powder 2-4 parts

1-2 parts of coupling agent

Thickener 3-6 parts

4-8 parts of pH regulator;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S102. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S103, adding a pH regulator to step S102 to adjust the pH value;

S104, finally adding water-based polyurethane and stripping agent to fully mix to obtain polyurethane slurry coarse material;

S105, adding matting powder to the polyurethane slurry coarse material matting treatment;

S106, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S107. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Preferably, the coupling agent is a 1:1 mixed product of vinyltriethoxysiloxane and y-methacryloxypropyltrimethoxysiloxane.

Preferably, the thickener is one of modified starch, modified cellulose, and propylene glycol alginate.

Preferably, when the water-based polyurethane is added in the step S104, it is added twice, the first time is 35%, and the second time is 65%. After the water-based polyurethane is completely added, a leveling agent and a catalyst are added to promote further progress of the reaction.

Preferably, when drying the polyurethane foam coating in the step S107, the drying temperature is 45° C., and the drying time is 15 minutes. The polyurethane foam coating passes through a drying oven at a speed of 16 m/min for uniform drying.

Preferably, performance testing is performed on the prepared high-hardness polyurethane foam skin coating, and the polyurethane foam skin coating hardness, coating drying time and environmental protection are tested.

Compared with the prior art, the present invention provides a preparation and experimental method of a high-hardness polyurethane foam crust coating, which has the following beneficial effects:

1. The preparation and experimental method of this high-hardness polyurethane foam crust coating, as can be seen from the results of the experiment, the formaldehyde removal rate of the polyurethane foam crust coating has declined when the pH value is biased towards neutral, and its coating is dry The time is effectively reduced, so it can be seen that not only the ratio of materials affects the product use effect of the polyurethane foam skin coating, but also the control of the pH value in the preparation process of the polyurethane foam skin coating is also important, and the pH value also affects Based on the product effect after the polyurethane foam skin coating is prepared, new ideas and improvements are provided for the preparation of the polyurethane foam skin coating.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

A high-hardness polyurethane foam crust coating, comprising the following materials in parts by mass:

75-85 parts of polyether polyol

Toluene diisocyanate 80-100 parts

60-80 parts of polyether polyol

Acrylate 15-20 parts

150-200 parts of water-based polyurethane

Leveling agent 5-6 parts

Modified palygorskite 10-12 parts

Catalyst 5-6 parts

25-30 parts of hydrated neodymium carbonate

3-4 parts of peeling aid

Matting powder 2-4 parts

1-2 parts of coupling agent

Thickener 3-6 parts

4-8 parts of pH regulator;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S102. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S103, adding a pH regulator to step S102 to adjust the pH value;

S104, finally adding water-based polyurethane and stripping agent to fully mix to obtain polyurethane slurry coarse material;

S105, adding matting powder to the polyurethane slurry coarse material matting treatment;

S106, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S107. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Further, the coupling agent is a product obtained by mixing vinyltriethoxysiloxane and y-methacryloxypropyltrimethoxysiloxane at a ratio of 1:1.

Further, the thickener is one of modified starch, modified cellulose, and propylene glycol alginate.

Further, when water-based polyurethane is added in step S104, it is added in two steps, 35% is added for the first time, and 65% is added for the second time. After the water-based polyurethane is added completely, a leveling agent and a catalyst are added to promote further progress of the reaction.

Further, in the step S107, when drying the polyurethane foam coating, the drying temperature is 45° C., and the drying time is 15 minutes. The polyurethane foam coating is uniformly dried through a drying oven at a speed of 16 m/min.

Further, performance testing was carried out on the prepared high-hardness polyurethane foam skin coating, and the polyurethane foam skin coating hardness, coating drying time and environmental protection were tested.

Embodiment one:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

75 parts of polyether polyol

80 parts of toluene diisocyanate

Polyether polyol 60

Acrylic 15 parts

150 parts of water-based polyurethane

Leveling agent 5 parts

Modified palygorskite 10 parts

Catalyst 5 parts

25 parts of hydrated neodymium carbonate

3 parts peeling aid

Matting powder 2 parts

1 part coupling agent

3 parts thickener

4 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Embodiment two:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Embodiment three:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

85 parts of polyether polyol

100 parts of toluene diisocyanate

80 parts of polyether polyol

Acrylic 20 parts

200 parts of water-based polyurethane

Leveling agent 6 parts

Modified palygorskite 12 parts

Catalyst 6 parts

30 parts of hydrated neodymium carbonate

4 parts peeling aid

Matting powder 4 parts

2 parts of coupling agent

Thickener 6 parts

8 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Comparative example one:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

70 parts of polyether polyol

75 parts of toluene diisocyanate

65 parts of polyether polyol

Acrylic 12 parts

140 parts of water-based polyurethane

Leveling agent 4.5 parts

Modified palygorskite 8 parts

Catalyst 4.5 parts

23 parts of hydrated neodymium carbonate

2.5 parts of peeling aid

Matting powder 1.5 parts

0.75 parts of coupling agent

Thickener 2.5 parts

3.5 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Comparative example two:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

90 parts of polyether polyol

110 parts of toluene diisocyanate

85 parts of polyether polyol

Acrylic 25 parts

220 parts of water-based polyurethane

Leveling agent 6.5 parts

Modified palygorskite 14 parts

Catalyst 6.5 parts

35 parts of hydrated neodymium carbonate

4.5 parts of peeling aid

Matting powder 4.5 parts

2.5 parts of coupling agent

Thickener 6.5 parts

9 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

To embodiment one, embodiment two, embodiment three, comparative example one, comparative example two, the polyurethane foam crust coating prepared under five different proportions is carried out experimental detection, detects and selects the polyurethane foam crust coating of same specification It was tested for formaldehyde removal rate, paint film hardness, coating adhesion, and coating drying time. The test results are as follows.

According to the above test results, it can be seen that the data of the polyurethane foam crust coating prepared under the ratio of Example 2 performed better, so the ratio of Example 2 was used for preparation of the polyurethane foam crust coating.

Adopt the polyurethane foam skin coating prepared under the proportioning of embodiment two to carry out pH value to the product quality impact after polyurethane foam skin coating is prepared;

Embodiment four:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value to 6.0;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Embodiment five:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value to 7.0;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Embodiment six:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value to 8.0;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Comparative example three:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value to 5.5;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Comparative example four:

A high-hardness polyurethane foam skin coating, including materials: polyether polyol, toluene diisocyanate, polyether polyol, acrylate, water-based polyurethane, leveling agent, modified palygorskite, catalyst, hydrated neodymium carbonate, Stripping aids, matting powders, coupling agents, thickeners, pH regulators;

The preparation method of described high hardness polyurethane foam crust coating is as follows:

S101. Prepare the following materials:

80 parts of polyether polyol

90 parts of toluene diisocyanate

70 parts of polyether polyol

Acrylate 17.5 parts

175 parts of water-based polyurethane

Leveling agent 5.5 parts

Modified palygorskite 11 parts

Catalyst 5.5 parts

27.5 parts of hydrated neodymium carbonate

3.5 parts of peeling aid

Matting powder 3 parts

1.5 parts of coupling agent

Thickener 4.5 parts

6 parts of pH regulator;

S102, mixing water-based polyurethane with modified palygorskite and a coupling agent in water at a ratio of 1:16:120 to obtain a modified palygorskite slurry;

S103. Put the modified palygorskite slurry and polyether polyol into a mixing tank for stirring for 2 hours, and add a thickener to the stirring tank and continue stirring for 1.5 hours;

S104, adding a pH regulator to step S102 to adjust the pH value to 8.5;

S105, finally adding water-based polyurethane and stripping agent and fully mixing to obtain polyurethane slurry coarse material;

S106, adding matting powder to the polyurethane slurry coarse material matting treatment;

S107, putting the polyurethane slurry coarse material into a foaming machine to form a polyurethane foam coating;

S108. The polyurethane foam coating is coated on the coated base layer and then dried to obtain the polyurethane foam coating.

Experimental test is carried out to the polyurethane foam crust coating prepared under embodiment four, embodiment five, embodiment six, comparative example three, comparative example four, test result is as follows:

From the results of the above experiments, it can be seen that the formaldehyde removal rate of the polyurethane foam skin coating in the five embodiments of the five examples has declined when the pH value is biased towards neutral, and the coating drying time has been effectively reduced, so it can be seen that not only the material The proportion of the polyurethane foam crust coating affects the product use effect. It is also important to control the pH value during the preparation of the polyurethane foam crust coating. The pH value also affects the product effect after the polyurethane foam crust coating is prepared. , which provides new ideas and improvements for the preparation of polyurethane foam crust coating.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (6)

1. A high hardness polyurethane foam skinning coating characterized by: comprises the following materials in parts by weight:

75-85 parts of polyether polyol

Toluene diisocyanate 80-100 parts

60-80 parts of polyether polyol

Acrylic ester 15-20 parts

150-200 parts of aqueous polyurethane

5-6 parts of leveling agent

10-12 parts of modified palygorskite

5-6 parts of catalyst

25-30 parts of hydrated neodymium carbonate

Stripping aid 3-4 parts

2-4 parts of extinction powder

1-2 parts of coupling agent

3-6 parts of thickening agent

4-8 parts of pH regulator;

the preparation method of the high-hardness polyurethane foam skinning coating comprises the following steps:

s101, mixing aqueous polyurethane with modified palygorskite and a coupling agent according to a ratio of 1:16:120 in water to obtain a modified palygorskite slurry;

s102, placing the modified palygorskite slurry and polyether polyol into a mixing kettle for stirring for 2 hours, and adding a thickening agent into the stirring kettle for continuous stirring for 1.5 hours;

s103, adding a pH regulator into the step S102 to regulate the pH value;

s104, finally adding water-based polyurethane and a stripping aid, and fully mixing to obtain polyurethane slurry coarse material;

s105, performing extinction treatment on the polyurethane slurry coarse material, and adding extinction powder into the polyurethane slurry coarse material to perform extinction treatment;

s106, placing the polyurethane slurry coarse material into a foaming machine to form polyurethane foam paint;

and S107, coating the polyurethane foam coating on the coating base layer, and drying to obtain the polyurethane foam coating.

2. A high hardness polyurethane foam skinning coating according to claim 1 wherein: the coupling agent is a product obtained by mixing vinyl triethoxy siloxane and y-methacryloxypropyl trimethoxy siloxane according to a ratio of 1:1.

3. A high hardness polyurethane foam skinning coating according to claim 1 wherein: the thickener is one of modified starch, modified cellulose and propylene glycol alginate.

4. A high hardness polyurethane foam skinning coating according to claim 1 wherein: in the step S104, the aqueous polyurethane is added twice, wherein 35% of the aqueous polyurethane is added for the first time, 65% of the aqueous polyurethane is added for the second time, and the leveling agent and the catalyst are added after the aqueous polyurethane is added completely to promote the further reaction.

5. A high hardness polyurethane foam skinning coating according to claim 1 wherein: the drying temperature is 45 ℃ and the drying time is 15min when the polyurethane foam coating is dried in the step S107, and the polyurethane foam coating is uniformly dried through a drying box at the speed of 16 m/min.

6. A method for testing a high hardness polyurethane foam skinning coating applied to the high hardness polyurethane foam skinning coating of claim 1, comprising the steps of: and performing performance detection on the prepared high-hardness polyurethane foam skinning coating, and testing the hardness, the coating drying time and the environmental protection of the polyurethane foam skinning coating.