CN115304816A - Polyurethane foam sheet for simulated printing and preparation method thereof - Google Patents

Abstract

The invention relates to a polyurethane foam sheet for simulation printing and a preparation method thereof, and belongs to the technical field of polyurethane. The foam sheet is foamed by prepolymer, white material and hydrogen peroxide solution. The white material is mixed with an antibacterial foaming agent. The porous sponge-like zinc oxide material is used as a carrier and dispersed in lignosulfonic acid. Add oxalic acid dropwise to the sodium solution, oxalic acid is chelated with zinc-containing micropowder, oxalic acid is attached to the surface of zinc oxide, sodium lignosulfonate is precipitated under acidic conditions, and the complex of oxalic acid and zinc oxide is attached to its surface as a nucleating material , During the foaming process, hydrogen peroxide and surface-loaded oxalic acid react to generate carbon dioxide and water, in which carbon dioxide forms primary pores, and the water in hydrogen peroxide and the water generated by the reaction react with isocyanate groups to form carbon dioxide pores. Foaming process, easy to control foaming, fine and uniform cells, used in shoe uppers, high simulation and good mechanical properties.

Description

A kind of polyurethane foam sheet for simulated printing and preparation method thereof

technical field

The invention belongs to the technical field of polyurethane, and in particular relates to a polyurethane foam sheet for simulated printing and a preparation method thereof.

Background technique

The traditional shoe upper is made of splicing fabrics of different textures and colors. This kind of shoe upper has through-seams, which makes the shoe upper not waterproof. In addition, the cutting, splicing and sewing of shoe upper materials are difficult, and the product quality Consistency is poor, and a kind of imitation printed upper is gradually emerging in the prior art, as Chinese patent CN114474812A discloses the manufacture method of imitated printed upper, and it adopts polyurethane foam sheet as raw material, prepares waterproof vamp by emulated printing.

The traditional polyurethane foam sheet is to react polyester or polyether polyol with organic isocyanate to form a prepolymer with terminal isocyanate groups, and then add various measured additives to the prepolymer for reaction to form urea bonds Carry out chain growth reaction and foaming reaction at the same time to make foaming materials; foaming agents include physical and chemical foaming agents. The foaming principle of physical foaming agents is to pass into easily vaporized materials. During the process, the foaming agent vaporizes to form pores. The foaming of this type of foaming material is uneven and the degree of foaming is difficult to control; the most common chemical type of foaming agent is water. Water reacts with isocyanate groups to form carbon dioxide to form pores. This type of foaming The material molding process is easy to control, but the mechanical properties of the foamed material obtained after doping with a large amount of water are not very good, and it is difficult to apply it to the shoe upper material for hot pressing.

Contents of the invention

In order to solve the technical problems mentioned in the background technology, the object of the present invention is to provide a polyurethane foam sheet for simulation printing and a preparation method thereof.

The purpose of the present invention can be achieved through the following technical solutions:

A kind of preparation method of polyurethane foam sheet for imitation printing, comprises the steps:

Step S1: Take a reactor equipped with a thermometer and a stirrer, add polyadipate-1,4-butylene glycol ester diol, place the reactor in an oil bath at 110°C for constant temperature heating, and then vacuumize Dehydration to 5mmHg for 2 hours under pressure to complete the dehydration treatment of polyadipate-1,4-butylene glycol ester diol;

Step S2: Take the polymerization kettle equipped with a reflux condenser, clean the polymerization kettle with dry nitrogen, add dehydrated polyadipate-1,4-butylene glycol ester diol and tetrahydrofuran and stir to dissolve, then add isophor Stir and mix the ketone diisocyanate, then heat up to 58-65°C and react for 75-85min to make a prepolymer;

Step S3: Take the antibacterial foaming agent, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil and add them to the mixer and mix them evenly to make a white material;

Step S4: Mix the prepolymer and white material and add it to the polymerization kettle, raise the temperature to 75-80°C and stir for 3-4 hours, then add hydrogen peroxide solution and stir for 5 minutes at high speed, then transfer to the mold cavity for foaming treatment , followed by drying and cutting to make foam sheets.

Further, the dosage ratio of poly-1,4-butylene adipate diol, tetrahydrofuran and isophorone diisocyanate is 30-35g: 110-150mL: 17-22g.

Further, the dosage ratio of the antibacterial foaming agent, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil is 5-8g: 40-50mL: 0.5-1g: 10-15mL.

Further, the amount ratio of prepolymer, white material and hydrogen peroxide solution is 90-110g:55-68g:12-15g, and the concentration of hydrogen peroxide solution is 60%.

Further, the specific process of foaming treatment includes:

Pressurized curing and foaming: add steam to pressurize to 5-6bar, the temperature is 120-130°C, and foam for 55-80min;

Homogenized foaming at constant temperature: transfer it to a constant temperature and humidity box, set the temperature at 60°C, and set the humidity at 90% to stand for foaming for 3-5 hours.

Described antibacterial foaming agent is prepared by following method:

Step A1: Dissolve zinc acetate in ethanol solution, add ammonia water dropwise under ultrasonic dispersion, let it stand for 5 hours after the dropwise addition, centrifuge to remove the jelly in the lower layer, spin dry, and then transfer it to an oxidation furnace for roasting to make zinc-containing micropowder;

Further, the dosage ratio of zinc acetate, ethanol solution and ammonia water is 10g:80-100mL:9-14mL, the concentration of ethanol solution is 20-30%, and the concentration of ammonia water is 10-15%.

Further, the oxygen content in the oxidation furnace is 50-80%, the calcination temperature is 820-950° C., and the calcination time is 2-3 hours.

Step A2: Dissolve sodium lignosulfonate in water to make a dispersion liquid, then add zinc-containing micro-powder into the dispersion liquid for ultrasonic dispersion, then add oxalic acid solution dropwise under stirring, oxalic acid is chelated with zinc-containing micro-powder, and oxalic acid adheres On the surface of the zinc-containing micropowder, sodium lignosulfonate is precipitated under acidic conditions, and the complex of oxalic acid and zinc-containing micropowder is used as a nucleating material to adhere to the surface, and the lower layer is separated by centrifugation and vacuum-dried to make an antibacterial foaming agent.

Further, the mass fraction of sodium lignosulfonate in the dispersion is 5.8-7.5%, and the dosage ratio of the dispersion, zinc-containing micropowder and oxalic acid is 30-50mL:6-8g:2-5mL.

Beneficial effects of the present invention:

The invention adopts an antibacterial foaming agent and hydrogen peroxide solution to foam synergistically. The antibacterial foaming agent reacts with zinc acetate and ammonia water to form a zinc-containing complex gel, which is then oxidized and roasted to form a zinc-containing micropowder. It is a porous spongy zinc oxide material with a high specific surface area and good loading capacity. It is dispersed in a sodium lignosulfonate solution and added with oxalic acid. The oxalic acid is chelated with the zinc-containing micro-powder, and the oxalic acid is attached to the surface of the zinc-containing micro-powder. Sodium lignosulfonate precipitates under acidic conditions and adheres to its surface with a complex of oxalic acid and zinc-containing micropowder as a nucleating material. During the foaming process, hydrogen peroxide reacts with surface-loaded oxalic acid to generate carbon dioxide and water. Among them, carbon dioxide forms primary pores, and the water in hydrogen peroxide and the water generated by the reaction react with isocyanate groups to form carbon dioxide pores. With the two-stage foaming process, compared with the existing physical foaming process, the foaming process is relaxed and the foaming The foam is easy to control, and the foam is uniformly foamed from the inside of the foaming material, and the cells are more fine and uniform, which is beneficial to improve the degree of simulation. The problem of mechanical property decline caused by foaming; at the same time, zinc oxide is used as a load material in the present invention, which has a certain antibacterial effect, making the foaming sheet suitable for shoe upper materials.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, 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 creative efforts fall within the protection scope of the present invention.

Example 1

The present embodiment prepares a kind of antibacterial foaming agent, and specific implementation process is as follows:

Step A1: Dissolve zinc acetate in ethanol solution, add ammonia water dropwise under ultrasonic dispersion, let it stand for 5 hours after dropping, centrifuge to remove the jelly in the lower layer, spin dry, and then transfer to an oxidation furnace for roasting to make zinc-containing micropowder. Among them, the dosage ratio of zinc acetate, ethanol solution, and ammonia water is 10g: 80mL: 9mL, the ultrasonic dispersion frequency is 28kHz, the concentration of ethanol solution is 20%, and the concentration of ammonia water is 15%. Oxygen is introduced into the oxidation furnace to adjust the furnace The oxygen content of the atmosphere is 50%, the firing temperature is set to 820°C, and the firing time is set to 3h;

Step A2: Stir and mix sodium lignosulfonate and water to form a dispersion with a mass fraction of 5.8%, then add the zinc-containing micropowder into the dispersion for ultrasonic dispersion, dissolve oxalic acid in water, and set the stirring rate to 180rpm, Add the oxalic acid solution dropwise to the dispersion system of zinc-containing micro-powder, after the dropwise addition, precipitates are continuously precipitated, the reaction solution is transferred to a centrifuge and centrifuged for 10 minutes, and the lower layer is vacuum-dried to make an antibacterial foaming agent, dispersion liquid, zinc-containing The dosage ratio of fine powder and oxalic acid is 30mL: 6g: 2mL.

Example 2

The present embodiment prepares a kind of antibacterial foaming agent, and specific implementation process is as follows:

Step A1: Dissolve zinc acetate in ethanol solution, add ammonia water dropwise under ultrasonic dispersion, let it stand for 5 hours after dropping, centrifuge to remove the jelly in the lower layer, spin dry, and then transfer to an oxidation furnace for roasting to make zinc-containing micropowder. Among them, the dosage ratio of zinc acetate, ethanol solution, and ammonia water is 10g: 90mL: 12mL, the ultrasonic dispersion frequency is 28kHz, the concentration of ethanol solution is 25%, and the concentration of ammonia water is 10%. The oxygen content of the atmosphere is 60%, the firing temperature is set to 880°C, and the firing time is set to 2.5h;

Step A2: Stir and mix sodium lignosulfonate and water to form a dispersion with a mass fraction of 6.8%, then add the zinc-containing micropowder into the dispersion for ultrasonic dispersion, dissolve oxalic acid in water, and then set the stirring rate to 180rpm, Add the oxalic acid solution dropwise to the dispersion system of zinc-containing micro-powder, after the dropwise addition, precipitates are continuously precipitated, the reaction solution is transferred to a centrifuge and centrifuged for 10 minutes, and the lower layer is vacuum-dried to make an antibacterial foaming agent, dispersion liquid, zinc-containing The dosage ratio of fine powder and oxalic acid is 40mL: 7g: 4mL.

Example 3

The present embodiment prepares a kind of antibacterial foaming agent, and specific implementation process is as follows:

Step A1: Dissolve zinc acetate in ethanol solution, add ammonia water dropwise under ultrasonic dispersion, let it stand for 5 hours after dropping, centrifuge to remove the jelly in the lower layer, spin dry, and then transfer to an oxidation furnace for roasting to make zinc-containing micropowder. Among them, the dosage ratio of zinc acetate, ethanol solution, and ammonia water is 10g: 100mL: 14mL, the ultrasonic dispersion frequency is 28kHz, the concentration of ethanol solution is 30%, and the concentration of ammonia water is 10%. The oxygen content of the atmosphere is 80%, the firing temperature is set to 950°C, and the firing time is set to 2h;

Step A2: Stir and mix sodium lignosulfonate and water to form a dispersion with a mass fraction of 7.5%, then add the zinc-containing micropowder into the dispersion for ultrasonic dispersion, dissolve oxalic acid in water, and set the stirring rate to 180rpm, Add the oxalic acid solution dropwise to the dispersion system of zinc-containing micropowder, after dropping, the precipitation is continuously precipitated, the reaction solution is transferred to a centrifuge and centrifuged for 10 minutes, and the lower layer is vacuum-dried to make an antibacterial foaming agent, dispersion liquid, zinc-containing The dosage ratio of fine powder and oxalic acid is 50mL:8g:5mL.

Example 4

This implementation prepares a polyurethane foam sheet for simulation printing, and the specific implementation process is as follows:

Step S1: Take a reactor equipped with a thermometer and a stirrer, add polyadipate-1,4-butylene glycol ester diol, place the reactor in an oil bath at 110°C for constant temperature heating, and then vacuumize Dehydration at 5mmHg for 2 hours to make dehydrated poly-1,4-butylene adipate diol;

Step S2: Take the polymerization kettle equipped with a reflux condenser, clean the polymerization kettle with dry nitrogen, add dehydrated polyadipate-1,4-butylene glycol ester diol and tetrahydrofuran and stir to dissolve, then add isophorone di Stir and mix the isocyanate, heat it up to 58°C and react for 85 minutes to make a prepolymer, wherein the dosage ratio of polyadipate-1,4-butylene glycol ester diol, tetrahydrofuran and isophorone diisocyanate is 30g: 110mL: 17g;

Step S3: Take the antibacterial foaming agent prepared in Example 1, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil and add them to the mixer and mix them evenly to make a white material, wherein the antibacterial foaming agent The dosage ratio of agent, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil is 5g: 40mL: 0.5g: 10mL;

Step S4: Mix the prepolymer and white material and add them to the polymerization tank, raise the temperature to 75°C and stir for 4 hours, then add hydrogen peroxide solution and mix at high speed for 5 minutes, in which the prepolymer, white material and hydrogen peroxide The dosage ratio of the solution is 90g: 55g: 12g, the concentration of the hydrogen peroxide solution is 60%, and it is transferred into the mold cavity for scraping, and the thickness is controlled to be 1.8±0.3mm. ℃, pressure curing and foaming for 80 minutes, and then demolded and transferred to a constant temperature and humidity box. Blisters.

Example 5

This implementation prepares a polyurethane foam sheet for simulation printing, and the specific implementation process is as follows:

Step S1: Take a reactor equipped with a thermometer and a stirrer, add polyadipate-1,4-butylene glycol ester diol, place the reactor in an oil bath at 110°C for constant temperature heating, and then vacuumize Dehydration at 5mmHg for 2 hours to make dehydrated poly-1,4-butylene adipate diol;

Step S2: Take the polymerization kettle equipped with a reflux condenser, clean the polymerization kettle with dry nitrogen, add dehydrated polyadipate-1,4-butylene glycol ester diol and tetrahydrofuran and stir to dissolve, then add isophorone di Stir and mix the isocyanate, heat it up to 62°C and react for 80 minutes to make a prepolymer, wherein the dosage ratio of polyadipate-1,4-butylene glycol ester diol, tetrahydrofuran and isophorone diisocyanate is 30g: 130mL: 20g;

Step S3: Take the antibacterial foaming agent prepared in Example 2, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil and add them to the mixer and mix evenly to make a white material, wherein the antibacterial foaming agent The dosage ratio of agent, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil is 7g: 45mL: 0.8g: 12mL;

Step S4: Mix the prepolymer and white material and add them to the polymerization tank, raise the temperature to 80°C and stir for 3.5 hours, then add hydrogen peroxide solution and stir and mix at high speed for 5 minutes, in which the prepolymer, white material and peroxide The dosage ratio of the hydrogen solution is 100g: 62g: 14g, the concentration of the hydrogen peroxide solution is 60%, and it is transferred into the mold cavity for scraping, and the thickness is controlled to be 1.8±0.3mm. 120°C, pressure curing and foaming for 68 minutes, then demolded and transferred to a constant temperature and humidity box, set the temperature at 60°C, humidity at 90%, constant temperature homogenization and foaming for 4 hours, dried and cut after cooling, and made Foam sheet.

Example 6

This implementation prepares a polyurethane foam sheet for simulation printing, and the specific implementation process is as follows:

Step S1: Take a reactor equipped with a thermometer and a stirrer, add polyadipate-1,4-butylene glycol ester diol, place the reactor in an oil bath at 110°C for constant temperature heating, and then vacuumize Dehydration at 5mmHg for 2 hours to make dehydrated poly-1,4-butylene adipate diol;

Step S2: Take the polymerization kettle equipped with a reflux condenser, clean the polymerization kettle with dry nitrogen, add dehydrated polyadipate-1,4-butylene glycol ester diol and tetrahydrofuran and stir to dissolve, then add isophorone di Stir and mix the isocyanate, heat up to 65°C and react for 75 minutes to make a prepolymer, wherein the dosage ratio of polyadipate-1,4-butylene glycol ester diol, tetrahydrofuran and isophorone diisocyanate is 35g: 150mL: 22g;

Step S3: Take the antibacterial foaming agent prepared in Example 3, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil and add them to the mixer and mix evenly to make a white material, wherein the antibacterial foaming agent The dosage ratio of agent, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil is 8g: 50mL: 1g: 15mL;

Step S4: Mix the prepolymer and white material and add it to the polymerization tank, raise the temperature to 80°C and stir for 3 hours, then add hydrogen peroxide solution and mix at high speed for 5 minutes, in which the prepolymer, white material and hydrogen peroxide The dosage ratio of the solution is 110g: 68g: 15g, the concentration of the hydrogen peroxide solution is 60%, and it is transferred into the mold cavity for scraping, and the thickness is controlled to be 1.8±0.3mm. ℃, pressure curing and foaming for 55 minutes, then demolded and transferred to a constant temperature and humidity box, set the temperature at 60 ℃, humidity at 90%, constant temperature homogenization and foaming for 3 hours, dried and cut after cooling, and made hair Blisters.

Comparative example 1

This contrast adopts dichloromethane and water to be foaming agent replacement antibacterial foaming agent and hydrogen peroxide solution foaming system in embodiment 5, and concrete implementation process is as follows:

Step S1: using the same method as in Example 5 to prepare dehydrated poly-1,4-butylene adipate diol;

Step S2: Prepare the prepolymer by the same method as in Example 5;

Step S3: Add dichloromethane, water, 1,4-butanediol, dibutyltin dilaurate and methyl silicone oil into a blender and mix evenly to make a white material, wherein dichloromethane, water, 1 , Adjust the ratio of 4-butanediol, dibutyltin dilaurate and methyl silicone oil to 5.5mL: 10mL: 45mL: 0.8g: 12mL;

Step S4: Mix the prepolymer and white material, add them to the polymerization kettle and mix them for 5 minutes, transfer them into the mold cavity and scrape them, control the thickness to 1.8±0.3mm, and then pressurize and maintain the foaming and constant temperature uniform foaming in sequence. Afterwards, it is dried and cut to make a foam sheet.

Get the foam sheet prepared by Example 4-Example 6 and Comparative Example 1, and carry out the following performance tests, and the specific test data are as shown in Table 1:

Table 1

From the data in Table 1, it can be seen that the density of the foamed sheet prepared by the present invention is 0.632-0.671g/cm ³ , which has the characteristics of a porous lightweight foamed material, the tensile strength is 4.07-4.32MPa, and the elongation at break is 394-425%. , has good tensile properties, the tear strength is 16.57-17.31kN/m, the maximum puncture force is 22.3-25.5N, has good anti-destructive properties, and is suitable for shoe upper materials.

In order to verify the applicability of the foam sheets prepared in Examples 4-Example 6 and Comparative Example 1 for vamp embossing, three samples were taken from each group to prepare stepped silicone molds, and the compression amount was 0.2 mm , 0.5mm and 1mm, press the sample on the silicone mold, set the pressing pressure to 5kg/cm ² , high-frequency hot pressing, observe the surface state after embossing, check the flatness before and after embossing and the pressing error , the specific data are shown in Table 2:

Table 2

It can be seen from the data in Table 2 that the foamed sheet prepared by the present invention has a good surface condition, and the surface remains flat after high-frequency heat press printing, and the pressing error is only 0.013-0.017mm, which has a high degree of simulation for shoe upper printing.

Get the foam sheet prepared by Example 4-Example 6 and Comparative Example 1, with reference to the GB/T15979-2002 standard antibacterial test, the specific test data are as shown in Table 3:

table 3

It can be seen from the data in Table 3 that the foamed sheet prepared by the present invention has a certain antibacterial effect, and can play an antibacterial and deodorizing effect when applied to shoe upper materials.

In the description of the specification, descriptions referring to the terms "one embodiment", "example", "specific example" and the like mean that specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one of the present invention. Examples or examples. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above content is only an example and description of the present invention. Those skilled in the art will make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the invention or exceed the rights of the present invention. The scope defined in the claims should all belong to the protection scope of the present invention.

Claims (9)

1. A polyurethane foaming sheet for simulated printing is characterized by being formed by foaming a prepolymer, a white material and a hydrogen peroxide solution, wherein the white material is mixed with an antibacterial foaming agent;

the antibacterial foaming agent is prepared by the following method:

step A1: dissolving zinc acetate in ethanol solution, dropwise adding ammonia water under ultrasonic dispersion state, standing for 5h, centrifuging to obtain lower layer jelly, evaporating to dryness, and calcining in an oxidation furnace to obtain zinc-containing micropowder;

step A2: dissolving sodium lignosulfonate in water to prepare a dispersion solution, adding zinc-containing micro powder, performing ultrasonic dispersion, dripping oxalic acid solution under stirring, centrifuging, separating a lower layer, and performing vacuum drying to prepare the antibacterial foaming agent.

2. The polyurethane foam sheet for simulated printing according to claim 1, wherein the ratio of the zinc acetate, the ethanol solution and the ammonia water is 10g:80-100mL:9-14mL, the concentration of the ethanol solution is 20-30%, and the concentration of the ammonia water is 10-15%.

3. The polyurethane foam sheet for the simulated printing according to claim 1, wherein the oxygen content in the oxidation furnace is 50-80%, the baking temperature is 820-950 ℃, and the baking time is 2-3h.

4. The polyurethane foam sheet for the simulated printing according to claim 1, wherein the using amount ratio of the dispersion liquid, the zinc-containing micro powder and the oxalic acid is 30-50mL:6-8g:2-5mL, and the mass fraction of the sodium lignin sulfonate in the dispersion liquid is 5.8-7.5%.

5. The method for preparing the polyurethane foam sheet for the simulated printing according to claim 1, which is characterized by comprising the following steps:

step S1: heating poly (1, 4-butanediol adipate) diol to 110 ℃, vacuumizing to 5mmHg, and performing pressure maintaining dehydration for 2 hours to complete the dehydration treatment of the poly (1, 4-butanediol adipate) diol;

step S2: cleaning a polymerization kettle by using dry nitrogen, adding dehydrated poly (1, 4-butylene glycol adipate) diol and tetrahydrofuran, stirring for dissolving, adding isophorone diisocyanate, stirring for mixing, heating to 58-65 ℃, reacting for 75-85min, and preparing a prepolymer;

and step S3: adding an antibacterial foaming agent, 1, 4-butanediol, dibutyltin dilaurate and methyl silicone oil into a stirrer, and uniformly mixing to prepare a white material;

and step S4: mixing the prepolymer and the white material, adding the mixture into a polymerization kettle, heating to 75-80 ℃, stirring for reaction for 3-4h, adding a hydrogen peroxide solution, stirring and mixing for 5min, transferring the mixture into a die cavity for foaming treatment, and then sequentially drying and cutting to prepare a foaming sheet.

6. The method for preparing polyurethane foam sheet for emulation printing according to claim 5, wherein the amount ratio of 1, 4-butanediol adipate, tetrahydrofuran and isophorone diisocyanate is 30-35g:110-150mL:17-22g.

7. The method for preparing a polyurethane foam sheet for a simulated printing as claimed in claim 5, wherein the ratio of the antibacterial foaming agent to the 1, 4-butanediol, dibutyltin dilaurate and methyl silicone oil is 5-8g:40-50mL:0.5-1g:10-15mL.

8. The preparation method of the polyurethane foam sheet for the simulated printing as claimed in claim 5, wherein the dosage ratio of the prepolymer, the white material and the hydrogen peroxide solution is 90-110g:55-68g:12-15g, the concentration of the hydrogen peroxide solution is 60%.

9. The method for preparing the polyurethane foam sheet for the simulated printing according to claim 5, wherein the foaming treatment sequentially comprises the following steps:

pressure curing and foaming: introducing steam, pressurizing to 5-6bar at 120-130 deg.C, and foaming for 55-80min;

homogenizing and foaming at constant temperature: and (4) transferring the mixture into a constant temperature and humidity box, setting the temperature to be 60 ℃ and the humidity to be 90%, and standing and foaming for 3-5 hours.