CN114015227B

CN114015227B - Quick-curing slow-rebound acrylic foam and preparation method and application thereof

Info

Publication number: CN114015227B
Application number: CN202111579639.6A
Authority: CN
Inventors: 张玉山; 邹学良; 朱玲玲; 陈洪野; 吴小平
Original assignee: Cybrid Technologies Inc
Current assignee: Cybrid Technologies Inc
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2023-06-16
Anticipated expiration: 2041-12-22
Also published as: CN114015227A

Abstract

The invention provides a quick-curing slow-rebound acrylic foam and a preparation method and application thereof, wherein the quick-curing slow-rebound acrylic foam comprises the following raw materials in parts by weight: 100 parts of an acrylic polymer; 1-10 parts of isocyanate; 0.3-15 parts of foaming agent; 0.5-6 parts of chain extender; 0.03-1 part of delay catalyst. The acrylic foam has the advantages of rapid curing effect and excellent slow rebound effect, effectively improves the buffering and sound insulation properties of the foam, and is suitable for being used as a buffering material for sealing, buffering and other electronic equipment.

Description

Quick-curing slow-rebound acrylic foam and preparation method and application thereof

Technical Field

The invention belongs to the technical field of foam materials, and relates to a quick-curing slow-rebound acrylic foam and a preparation method and application thereof.

Background

The slow rebound foam is also called low rebound foam and zero pressure foam. The slow rebound foam is a foam material with viscoelasticity, when the foam is deformed under the action of external force, the strain is delayed from the change of stress, so that the foam does not return immediately under the action of external force, but returns to the original shape slowly after 5-40 seconds, and the foam material has the memory property, which is also called memory foam. The slow rebound foam can conform to the shape of a carrier due to the rebound resilience, the specific cell structure and the porosity of the slow rebound foam, so that the contact area is maximized, the stress gradient is minimized, the stress concentration point can be relieved, the force dispersibility is achieved, the high energy absorption, the good buffering performance and the good processability are achieved, and therefore the slow rebound foam is often used as a buffering material, a sound absorbing material, a slip-resistant material and the like, and the slow rebound material is widely applied in life due to the impact force absorption characteristic. Is widely applied to the fields of kiloelectronics, electrical appliances, digital codes, automobiles, communication and the like.

CN112680139a discloses an acrylic foam damping foam, the acrylic foam damping foam is applied to the OLED module, including from membranous layer and acrylic foam layer, from membranous layer and the cotton layer of acrylic foam coincide each other, the cotton layer of acrylic foam is formed by acrylic foam coating liquid coating stoving, the cotton coating liquid of acrylic foam adopts following component to make: acrylic polymer, isocyanate, foaming microsphere, inorganic filler, dispersant, inorganic pigment and organic solvent. The acrylic foam adhesive tape prepared by the invention can absorb impact force, has excellent impact absorptivity, can be widely used around liquid crystal as a buffer material by utilizing the characteristic, and has excellent durability without water decomposition caused by overlarge humidity. However, the acrylic foaming damping foam of the invention has slower curing speed, higher density and lower rebound resilience to be further improved.

Accordingly, in the art, development of a fast curing slow rebound acrylic foam is desired.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a quick-curing slow-rebound acrylic foam and a preparation method and application thereof. The acrylic foam has the advantages of rapid curing effect and excellent slow rebound effect, effectively improves the buffering and sound insulation performances of the foam, can effectively absorb impact kinetic energy by utilizing the characteristics, and is very suitable for being used as a buffering material for sealing, buffering and other electronic equipment.

To achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a quick-curing slow-rebound acrylic foam, which is prepared from the following raw materials in parts by weight:

in the present invention, an acrylic polymer having high elasticity is used as a main resin, and the content of primary hydroxyl groups in the acrylic polymer is high, so that the polymer has high reactivity and a soft segment is provided. The addition of the foaming agent enables a plurality of foam cell structures with different sizes and even distribution to be formed in the prepared acrylic foam, and the foam cells absorb impact kinetic energy, so that the acrylic foam has an excellent buffering effect and has small compression residual deformation. The catalyst is delayed to ensure that the material has longer operation time at normal temperature and does not influence the post-curing of the product, and when the material reaches the excitation temperature, the catalyst and isocyanate (serving as a curing agent) are delayed to act synergistically, so that the gel and the curing reaction are completed rapidly.

In the preparation raw materials of the quick-curing slow-rebound acrylic foam, the dosage of isocyanate can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts and the like.

In the preparation raw materials of the rapid-curing slow-rebound acrylic foam, the amount of the foaming agent can be 0.3 part, 0.5 part, 1 part, 3 parts, 5 parts, 8 parts, 10 parts, 12 parts, 13 parts or 15 parts, and the like.

In the preparation raw materials of the quick-curing slow-rebound acrylic foam, the usage amount of the chain extender can be 0.5 part, 1 part, 2 parts, 3 parts, 4 parts, 5 parts or 6 parts, etc.

In the preparation raw materials of the quick-curing slow-rebound acrylic foam, the delay catalyst can be used in an amount of 0.03 part, 0.05 part, 0.08 part, 0.1 part, 0.15 part, 0.2 part, 0.3 part, 0.5 part, 0.6 part, 0.8 part or 1 part, and the like.

Preferably, the number average molecular weight of the acrylic polymer is 3000-20000, for example 3000, 4000, 5000, 8000, 10000, 15000 or 20000, etc.

Preferably, the hydroxyl value of the acrylic polymer is 50 to 150mgKOH/g, for example, 50mgKOH/g, 60mgKOH/g, 70mgKOH/g, 80mgKOH/g, 90mgKOH/g, 100mgKOH/g, 110mgKOH/g, 120mgKOH/g, 130mgKOH/g, 140mgKOH/g, 150mgKOH/g, or the like.

Preferably, the acrylic polymer has a solids content of 30-80%, such as 30%, 40%, 50%, 60%, 70% or 80%, etc.

Preferably, the acrylic polymer comprises any one or a combination of at least two of polyester resin, polyurethane resin, epoxy resin, silicone resin, natural rubber blend modified acrylic polymer or natural rubber graft modified acrylic polymer.

Preferably, the isocyanate comprises any one or a combination of at least two of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene Diisocyanate (HDI) or Lysine Diisocyanate (LDI).

As a preferred embodiment of the present invention, the isocyanate comprises any one or a combination of at least two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate or hexamethylene diisocyanate. These isocyanates are selected to have a better curing effect than other isocyanates.

Preferably, the foaming agent comprises an organic chemical foaming agent or an inorganic chemical foaming agent. Chemical blowing agents are compounds which, after thermal decomposition, release gases such as carbon dioxide and nitrogen and form fine pores in the polymer composition, and are generally referred to as thermally decomposable chemical blowing agents having powdery character, which are uniformly dispersed in plastics and rubber, and which do not generate gases under low temperature conditions, and which decompose rapidly to generate a large amount of gases when reaching processing temperatures, thereby foaming them.

Preferably, the organic chemical foaming agent comprises any one or a combination of at least two of azo compounds, sulfonyl hydrazides, nitroso compounds, tri-imidazole compounds or azide compounds.

Preferably, the organic chemical blowing agent comprises any one or a combination of at least two of azobisisobutyronitrile, p-toluenesulfonyl hydrazide, dinitroso pentamethylene tetramine, or p-toluenesulfonyl azide.

Preferably, the inorganic chemical blowing agent comprises any one or a combination of at least two of sodium bicarbonate, ammonium carbonate, ammonium nitrate or sodium borohydride.

Preferably, the chain extender comprises any one or a combination of at least two of 1, 4-Butanediol (BDO), 1, 6-hexanediol, glycerol, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol, diethylaminoethanol (DEAE), 3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA), formaldehyde modified MOCA, ethylenediamine (DA) or N, N-dihydroxyl (diisopropyl) aniline (HPA). Chain extenders are substances which react with functional groups on the linear polymer chains to extend the molecular chains and increase the molecular weight.

Preferably, the delay catalyst comprises any one or a combination of at least two of (acetylacetonate) dibutyl tin dilaurate, (acetylacetonate) triethylenediamine, (acetylacetonate) zinc octoate or (acetylacetonate) ethanolamine. Compared with the conventional catalyst, the delayed catalyst ensures that the material has longer operation time at normal temperature and does not influence the post-curing of the product, the material starts to play a role in catalysis when reaching the excitation temperature, the material can instantaneously and geometrically increase, and the gel and curing reaction is rapidly completed, so that the mixing of the raw materials and longer operation time can be realized.

In a second aspect, the present invention provides a method for preparing the rapid-curing slow-rebound acrylic foam according to the first aspect, the method comprising the following steps:

(1) Mixing the formula amount of acrylic polymer, a delay catalyst, a chain extender, a foaming agent and an organic solvent, adding isocyanate, and dispersing and stirring to obtain a mixed solution;

(2) Coating the mixed solution on a substrate, and foaming and molding to obtain the quick-curing slow-rebound acrylic foam.

The preparation method of the invention is simple and easy to operate.

Preferably, the organic solvent includes any one of an ester organic solvent, a ketone organic solvent, an ether organic solvent, an alcohol organic solvent, an aromatic hydrocarbon organic solvent, an aliphatic organic solvent, or dimethyl sulfoxide, and preferably an ester organic solvent or a ketone organic solvent.

Preferably, the ester organic solvent comprises any one or a combination of at least two of methyl acetate, ethyl acetate, propyl acetate or butyl acetate.

Preferably, the ketone organic solvent comprises any one or a combination of at least two of acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone.

Preferably, the ether-type organic solvent includes any one or a combination of at least two of tetrahydrofuran, tetrahydropyran, and dioxane.

Preferably, the alcohol-based organic solvent includes any one or a combination of at least two of methanol, ethanol, t-butanol, isopropanol, or ethylene glycol.

Preferably, the aromatic hydrocarbon organic solvent includes any one or a combination of at least two of benzene, toluene, xylene, naphthalene, or naphtha.

Preferably, the aliphatic hydrocarbon organic solvent comprises any one or a combination of at least two of hexane, cyclohexane, octane, nonane, decane, undecane, dodecane or mineral essential oil.

Preferably, the organic solvent is added in an amount of 20 to 60 parts, for example, 20 parts, 30 parts, 40 parts, 50 parts, 60 parts, or the like, based on 100 parts by weight of the acrylic polymer.

Preferably, the substrate includes any one of a monolayer film, a composite polyester film, a coated polyester film, or a polymer co-extruded resin film.

Preferably, the substrate comprises any one of polyethylene terephthalate, polyimide, polyamide, aluminized film, polypropylene, or polytetrafluoroethylene. In the invention, the substrate serves as a carrier in the preparation of the fast-curing slow-rebound acrylic foam.

Preferably, the mixing of step (1) is high speed mixing.

Preferably, the mixing time in step (1) is 30 to 60 minutes, for example 30 minutes, 40 minutes, 50 minutes or 60 minutes, etc.

Preferably, the dispersing stirring in the step (1) is high-speed dispersing stirring.

Preferably, the dispersing and stirring time in the step (1) is 30-60 min, for example 30min, 40min, 50min or 60min, etc.

Preferably, the foaming molding in step (2) is performed in an oven, and the temperature of the oven is set as follows: the temperature of the first section of oven is 60-70 ℃ (e.g. 60 ℃, 65 ℃ or 70 ℃ etc.), the temperature of the second section of oven is 60-70 ℃ (e.g. 60 ℃, 65 ℃ or 70 ℃ etc.), the temperature of the third section of oven is 70-80 ℃ (e.g. 70 ℃, 75 ℃ or 80 ℃ etc.), the temperature of the fourth section of oven is 80-90 ℃ (e.g. 80 ℃, 85 ℃ or 90 ℃ etc.), the temperature of the fifth section of oven is 80-90 ℃ (e.g. 80 ℃, 85 ℃ or 90 ℃ etc.), the temperature of the sixth section of oven is 130-140 ℃ (e.g. 130 ℃, 135 ℃ or 140 ℃ etc.), the temperature of the seventh section of oven is 130-140 ℃ (e.g. 130 ℃, 135 ℃ or 140 ℃ etc.).

Preferably, the foaming time in step (2) is 1-3min, for example 1min, 2min or 3min.

Preferably, the thickness of the fast curing slow rebound acrylic foam of step (2) is 50 to 400 μm, for example 50 μm, 100 μm, 200 μm, 300 μm or 400 μm, etc.

In a third aspect, the present invention provides an application of the rapid-curing slow-rebound acrylic foam of the first aspect in a cushioning material.

Compared with the prior art, the invention has at least the following beneficial effects:

(1) In the present invention, an acrylic polymer having high elasticity is used as a main resin, and the content of primary hydroxyl groups in the acrylic polymer is high, so that the polymer has high reactivity and a soft segment is provided. The addition of the foaming agent enables a plurality of foam cell structures with different sizes and uniform distribution to be formed in the prepared acrylic foam, and the foam cells absorb impact kinetic energy, so that the acrylic foam has excellent buffering effect and small compression residual deformation (50% compression permanent deformation is less than or equal to 5%).

(2) In the invention, the catalyst is delayed to ensure that the material has longer operation time at normal temperature and does not influence the post curing of the product, and when the material reaches the excitation temperature, the catalyst and isocyanate are delayed to act synergistically, so that the gel and curing reaction is completed rapidly.

Detailed Description

The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.

Example 1

In this embodiment, a quick-curing slow-rebound acrylic foam is provided, and the preparation raw materials of the quick-curing slow-rebound acrylic foam comprise the following components in parts by weight:

wherein the number average molecular weight of the acrylic polymer (brand: jack chemical YZ-H305) is 4000, the hydroxyl value is 54mgKOH/g, and the solid content is 40%; the isocyanate is toluene diisocyanate; the foaming agent is azodiisobutyronitrile; the chain extender is 1, 4-butanediol; the delay catalyst is (acetylacetonate) dibutyl tin dilaurate.

The preparation method comprises the following steps:

(1) Mixing, dispersing and stirring the formula amount of acrylic polymer, a delay catalyst, a chain extender, a foaming agent and an organic solvent at a high speed for 40min, adding isocyanate, and mixing, dispersing and stirring at a high speed for 30min to obtain a mixed solution;

(2) Coating the mixed solution on a substrate, putting the substrate into an oven for heating, and foaming and forming to obtain the rapid-curing slow-rebound acrylic foam.

Wherein the organic solvent is ethyl acetate; the addition amount of the organic solvent is 40 parts by weight based on 100 parts by weight of the acrylic polymer; the substrate is polyethylene terephthalate.

The oven temperature was set as follows: the temperature of the first section of oven is 65 ℃, the temperature of the second section of oven is 65 ℃, the temperature of the third section of oven is 75 ℃, the temperature of the fourth section of oven is 85 ℃, the temperature of the fifth section of oven is 85 ℃, the temperature of the sixth section of oven is 135 ℃, and the temperature of the seventh section of oven is 135 ℃; the foaming molding time is 3min.

Example 2

wherein the number average molecular weight of the acrylic polymer (brand: jack chemical YZ-H706) is 5000, the hydroxyl value is 70mgKOH/g, and the solid content is 60%; the isocyanate is isophorone diisocyanate; the foaming agent is p-toluenesulfonyl hydrazine; the chain extender is 1, 6-hexanediol; the delay catalyst is (acetylacetonate) triethylenediamine.

The preparation method comprises the following steps:

(1) Mixing, dispersing and stirring the formula amount of acrylic polymer, a delay catalyst, a chain extender, a foaming agent and an organic solvent at a high speed for 30min, adding isocyanate, and mixing, dispersing and stirring at a high speed for 60min to obtain a mixed solution;

Wherein the organic solvent is butyl acetate; the addition amount of the organic solvent is 60 parts by weight based on 100 parts by weight of the acrylic polymer; the substrate is polyethylene terephthalate.

The oven temperature settings were the same as in example 1.

Example 3

wherein the acrylic polymer (brand: jack chemical YZ-H638) has a number average molecular weight of 8000, a hydroxyl value of 75mgKOH/g, and a solid content of 60%; the isocyanate is diphenylmethane diisocyanate; the foaming agent is dinitroso pentamethylene tetramine; the chain extender is glycerol; the delay catalyst is zinc (acetylacetonate) octoate.

The preparation method comprises the following steps:

(1) Mixing, dispersing and stirring the formula amount of acrylic polymer, a delay catalyst, a chain extender, a foaming agent and an organic solvent at a high speed for 50min, adding isocyanate, and mixing, dispersing and stirring at a high speed for 50min to obtain a mixed solution;

Wherein the organic solvent is methyl ethyl ketone; the addition amount of the organic solvent is 40 parts by weight based on 100 parts by weight of the acrylic polymer; the substrate is polyethylene terephthalate.

The oven temperature settings were the same as in example 1.

Example 4

wherein the acrylic polymer (brand: jack chemical Z-H880) has a number average molecular weight of 10000, a hydroxyl value of 100mgKOH/g and a solid content of 80%; the isocyanate is hexamethylene diisocyanate; the foaming agent is p-toluenesulfonyl azide; the chain extender is ethylenediamine; the delay catalyst is (acetylacetonate) ethanolamine.

The preparation method comprises the following steps:

(1) Mixing, dispersing and stirring the formula amount of acrylic polymer, a delay catalyst, a chain extender, a foaming agent and an organic solvent at a high speed for 60 minutes, adding isocyanate, and mixing, dispersing and stirring at a high speed for 40 minutes to obtain a mixed solution;

Wherein the organic solvent is toluene; the addition amount of the organic solvent is 55 parts by weight based on 100 parts by weight of the acrylic polymer; the substrate is polyethylene terephthalate.

The oven temperature settings were the same as in example 1.

Example 5

This example differs from example 1 only in that the blowing agent azobisisobutyronitrile was replaced with an equivalent amount of the foaming microspheres in CN112680139a, all other conditions being the same as in example 1.

Example 6

This example differs from example 1 only in that toluene diisocyanate was replaced with an equivalent amount of lysine diisocyanate, with the other conditions being the same as example 1.

Example 7

This example differs from example 1 only in that the delay catalyst (acetylacetonate) dibutyltin dilaurate was replaced with an equivalent amount of dibutyltin dilaurate, all other things being equal to example 1.

Comparative example 1

This comparative example differs from example 1 only in that the foaming agent is not included in the preparation raw material, and the other conditions are the same as in example 1.

Comparative example 2

This comparative example differs from example 2 only in that the weight part of the blowing agent is 25 parts, and the other conditions are the same as in example 2.

Comparative example 3

This comparative example differs from example 3 only in that diphenylmethane diisocyanate was not included in the preparation raw material, and the other conditions were the same as in example 3.

Comparative example 4

This comparative example differs from example 4 only in that the chain extender is not included in the preparation starting material, and the other conditions are the same as example 4.

Comparative example 5

This comparative example differs from example 3 only in that the preparation raw material does not include zinc octoate as a delay catalyst (acetylacetone), and the other conditions are the same as in example 3.

The acrylic foam provided in examples 1-7 and comparative examples 1-5 were subjected to performance testing as follows:

1. thickness test

(1) At least the outermost three turns of film should be removed when sampling from the film roll;

(2) Placing the taken sample in a standard test environment for at least 3 hours;

(3) And placing the sample between the upper head plane and the lower head plane of the measuring head of the thickness gauge, enabling the foam to face upwards, slowly lowering the upper measuring head during test, and finally covering the surface of the foam. In 1 second after the upper measuring head is lowered, the reading of a dial gauge of the thickness gauge is recorded, and the reading is expressed in mm and is accurate to 0.001mm;

(4) 9 points are measured on each single chip, data are recorded, and an average value is calculated; wherein the distance between every 2 points is not less than 50mm.

2. Density testing

(3) Cutting a sample into samples with the size of 10cm x 10cm under the condition of room temperature, wherein the weight of the test monomer foam is m, and the thickness test method is recorded as h as the test condition;

(4) The density calculation formula: ρ=m/h×100.

3. Compressive Strength test

(1) Taking a rolled or sheet sample, firstly cutting the product into strips with the size of 50mm multiplied by 200mm, and standing for more than 2 hours under the test condition;

(2) Overlapping samples layer by layer to prepare 25mm x 10mm samples, and standing for 24 hours in a laboratory at constant temperature after the completion;

(3) Testing the sample by using a universal mechanical press at a compression speed of 5mm/min, and performing compression test on the sample;

(4) Compression strength data values corresponding to 25% and 50% compression rates were taken, respectively.

4. Compression set test: the test was carried out according to the method of GB/T6669-2008.

5. Ball drop impact test

(1) Taking a rolled or sheet sample, firstly cutting the product into strips with the size of 100mm multiplied by 100mm, and standing for more than 2 hours under the test condition;

(2) Cell-phone apron glass, sample specification: 60mm is equal to 120mm is equal to 0.7mm, and the acrylic foam material is attached;

(3) The stainless steel ball, weight 55g, diameter at 25mm size, carry out impact test to the cell-phone glass apron that the foam is laminated at 500mm height, observe whether the sample is intact.

The results of the performance test are shown in Table 1.

TABLE 1

As can be seen from Table 1, the acrylic foam prepared in examples 1 to 4 of the present invention had a density of 0.3 to 0.5g/cm ³ The foaming thickness can be adjusted between 100 and 400 mu m, the foam has good compression strength and rebound resilience, the compression set is less than or equal to 5 percent, and the foam has good impact absorption performance and buffering and damping performance, and can well protect products. By utilizing the characteristics, the acrylic foam can be used as a buffer material to be applied around liquid crystal, and the detection results of the examples 1-4 are all in the range of the test requirements, so that the use requirements are met.

The acrylic foam prepared in examples 5 to 7 had a thickness and a density satisfying the performance requirements, but had an unsatisfactory compression resistance, and could not rebound after long-term compression, and had a compression strength larger or lower according to examples 5 to 7.

The performance of the acrylic foam prepared in the comparative example is not in accordance with the requirement, the acrylic foam has no obvious buffering performance, the test glass is broken, meanwhile, the compression deformation is large, the rebound cannot be very good, and the slow rebound performance and the buffering effect cannot be achieved.

The applicant states that the present invention is described by the above examples for the rapid curing and slow rebound acrylic foam of the present invention and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be practiced by relying on the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.

Claims

1. The quick-curing slow-rebound acrylic foam is characterized by comprising the following raw materials in parts by weight:

the hydroxyl value of the acrylic polymer is 50-150mgKOH/g;

the isocyanate comprises any one or a combination of at least two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate or hexamethylene diisocyanate;

the foaming agent comprises an organic chemical foaming agent or an inorganic chemical foaming agent;

the organic chemical foaming agent comprises any one or a combination of at least two of azo compounds, sulfonyl hydrazides compounds, nitroso compounds, triisomidazoles compounds and azide compounds;

the inorganic chemical foaming agent comprises any one or a combination of at least two of sodium bicarbonate, ammonium carbonate, ammonium hydrogen nitrate or sodium borohydride;

the chain extender comprises any one or a combination of at least two of 1, 4-butanediol, 1, 6-hexanediol, glycerol, trimethylolpropane, diethylene glycol, triethylene glycol, neopentyl glycol, sorbitol, diethylaminoethanol, 3 '-dichloro-4, 4' -diaminodiphenylmethane, formaldehyde modified 3,3 '-dichloro-4, 4' -diaminodiphenylmethane, ethylenediamine or N, N-dihydroxyl (diisopropyl) aniline;

the delay catalyst comprises any one or a combination of at least two of acetylacetone/dibutyl tin dilaurate, acetylacetone/triethylenediamine, acetylacetone/zinc octoate or acetylacetone/ethanolamine.

2. The quick setting, slow rebound acrylic foam of claim 1 wherein the acrylic polymer has a number average molecular weight of 3000 to 20000.

3. The quick setting, slow rebound acrylic foam of claim 1 wherein the acrylic polymer has a solids content of 30 to 80%.

4. The quick setting, slow rebound acrylic foam of claim 1 wherein the organic chemical blowing agent comprises azobisisobutyronitrile, p-toluenesulfonyl hydrazide _、 Any one or a combination of at least two of dinitroso pentamethylene tetramine or p-toluenesulfonyl azide.

5. The method for preparing the rapid-curing slow-rebound acrylic foam according to any one of claims 1 to 4, wherein the method comprises the steps of:

6. The method according to claim 5, wherein the organic solvent comprises any one of an ester organic solvent, a ketone organic solvent, an ether organic solvent, an alcohol organic solvent, an aromatic hydrocarbon organic solvent, an aliphatic hydrocarbon organic solvent, and dimethyl sulfoxide.

7. The method according to claim 6, wherein the organic solvent comprises an ester organic solvent or a ketone organic solvent.

8. The method according to claim 6, wherein the organic solvent is an ester organic solvent comprising any one or a combination of at least two of methyl acetate, ethyl acetate, propyl acetate, and butyl acetate.

9. The method according to claim 6, wherein the ketone-based organic solvent comprises any one or a combination of at least two of acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone.

10. The method according to claim 6, wherein the ether-based organic solvent comprises any one or a combination of at least two of tetrahydrofuran, tetrahydropyran and dioxane.

11. The method according to claim 6, wherein the alcoholic organic solvent comprises any one or a combination of at least two of methanol, ethanol, t-butanol, isopropanol, and ethylene glycol.

12. The method according to claim 6, wherein the aromatic hydrocarbon organic solvent comprises any one or a combination of at least two of benzene, toluene, xylene, naphthalene, and naphtha.

13. The method according to claim 6, wherein the aliphatic hydrocarbon organic solvent comprises any one or a combination of at least two of hexane, cyclohexane, octane, nonane, decane, undecane, dodecane, and mineral essential oil.

14. The method according to claim 5, wherein the organic solvent is added in an amount of 20 to 60 parts by weight based on 100 parts by weight of the acrylic polymer.

15. The method according to claim 5, wherein the substrate comprises any one of a monolayer film, a composite polyester film, a coated polyester film, and a polymer co-extruded resin film.

16. The method according to claim 5, wherein the substrate comprises any one of polyethylene terephthalate, polyimide, polyamide, aluminized film, polypropylene, and polytetrafluoroethylene.

17. The method of claim 5, wherein the mixing in step (1) is high speed mixing.

18. The method according to claim 5, wherein the mixing time in the step (1) is 30 to 60 minutes.

19. The method according to claim 5, wherein the dispersion stirring in the step (1) is high-speed dispersion stirring.

20. The method according to claim 5, wherein the time of the dispersion stirring in the step (1) is 30 to 60 minutes.

21. The method of claim 5, wherein the foam molding in step (2) is performed in an oven at the following temperature settings: the temperature of the first section of oven is 60-70 ℃, the temperature of the second section of oven is 60-70 ℃, the temperature of the third section of oven is 70-80 ℃, the temperature of the fourth section of oven is 80-90 ℃, the temperature of the fifth section of oven is 80-90 ℃, the temperature of the sixth section of oven is 130-140 ℃, and the temperature of the seventh section of oven is 130-140 ℃.

22. The method according to claim 5, wherein the foaming time in the step (2) is 1 to 3 minutes.

23. The method according to claim 5, wherein the thickness of the rapid-curing slow-rebound acrylic foam in the step (2) is 50 to 400. Mu.m.

24. Use of the fast curing slow rebound acrylic foam according to any one of claims 1-4 in cushioning materials.