A flexible slow-rebound polyacrylate thin foam composition and its preparation method

Abstract

The present invention discloses a flexible slow-rebound polyacrylate thin foam composition and a preparation method thereof. The composition comprises a triblock acrylic copolymer, a functional polyurethane (meth)acrylate, expandable microspheres and a curing agent, and is prepared through steps such as coating, high-temperature foaming and aging. According to different application fields, the present invention can prepare flexible slow-rebound polyacrylate thin foams with different thicknesses, different surface impact absorption rates at different ball-drop points and different compression strengths by using two types of expandable microspheres with different particle sizes and particle sizes after foaming, and can also prepare flexible slow-rebound polyacrylate thin foams with different heat resistances by the high or low expansion temperature of the expandable microspheres. The foam can be used as a gasket or liner for electronic components such as LCDs, displays, speakers, cameras, lenses and microphones in 3C products.

Description

Technical Field

[0001] The present invention relates to the technical field of thin foam, and specifically relates to a flexible slow-rebound polyacrylate thin foam composition and a preparation method thereof. Background Art

[0002] As the body and screen of electronic products become thinner and thinner, the display screen size becomes larger and larger, and the frame becomes narrower and narrower, the structural design of electronic products not only requires better anchoring and bonding between the body and the display screen, but also has higher requirements for sensitive electronic components such as displays and batteries in terms of waterproofing, shock resistance, and drop resistance. Therefore, there must be a material with waterproof and buffering functions - flexible slow-rebound thin foam around these sensitive electronic components to prevent damage to the sensitive electronic components due to splashing, bumping, or dropping during the use of electronic products.

[0003] Existing flexible slow-rebound foams can be classified into polyacrylate foams, polyethylene foams, polyurethane foams, ethylene-vinyl acetate copolymer foams, silicone foams, and rubber foams according to the type of polymer matrix. Compared with polyacrylate foams, other foams have poor adsorption, waterproofness, and resilience. Secondly, foreign suppliers almost monopolize the flexible slow-rebound thin foams used as gaskets or liners for electronic components such as LCDs, displays, speakers, cameras, lenses, and microphones in 3C products, especially flexible slow-rebound polyacrylate foams with a thickness of 80 - 200 microns. There are few domestic suppliers of flexible slow-rebound thin foams, especially manufacturers of flexible slow-rebound polyacrylate thin foam products, and their products have low ball-drop impact absorption and poor resilience.

[0004] Therefore, the present invention provides a flexible slow-rebound polyacrylate thin foam composition and a preparation method thereof. Summary of the Invention

[0005] In view of the above reasons, the object of the present invention is to provide a flexible slow-rebound polyacrylate thin foam composition and a preparation method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solutions. A flexible slow-rebound polyacrylate thin foam composition, characterized in that it comprises the following components:

[0007] (1) At least one triblock acrylic copolymer elastomer, which is an ABA-type block copolymer elastomer composed of poly(methyl methacrylate) as the hard segment and a polymer of an acrylic acid derivative with a glass transition temperature less than 0°C as the soft segment, wherein poly(methyl methacrylate) accounts for 5.00 - 45.00 wt% of the triblock acrylic copolymer elastomer;

[0008] (2) Polyurethane (meth)acrylate;

[0009] (3) At least two kinds of expandable microspheres, with the starting expansion temperature and the maximum expansion temperature of each kind of expandable microsphere differing by 10 - 60 °C;

[0010] (4) Solvent, curing agent, crosslinking agent.

[0011] More preferably, based on a total of 100.00 wt%, the triblock acrylic copolymer elastomer accounts for 4.10 - 14.3 wt%, the polyurethane (meth)acrylate accounts for 15.10 - 30.20 wt%, the expandable microspheres account for 1.20 - 1.50 wt%, the curing agent accounts for 0.30 - 0.60 wt%, the color paste accounts for 0.00 - 4.20 wt%, the solvent accounts for 48.3 - 78.9 wt%, and the crosslinking agent accounts for 0.40 - 0.90 wt%.

[0012] More preferably, the soft segment is one or two of n-butyl (meth)acrylate, 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, lauryl methacrylate, stearyl (meth)acrylate, and isodecyl (meth)acrylate.

[0013] More preferably, the triblock acrylic copolymer elastomer is one or several of LA2270, LA2250, LA2140, LA2330, LA3320, and LA2114.

[0014] More preferably, the polyurethane (meth)acrylate is one or a mixture of several of bifunctional polyurethane (meth)acrylate, trifunctional polyurethane (meth)acrylate, tetrafunctional polyurethane (meth)acrylate, pentafunctional polyurethane (meth)acrylate, hexafunctional polyurethane (meth)acrylate, octafunctional polyurethane (meth)acrylate, decafunctional polyurethane (meth)acrylate, or pentadecafunctional polyurethane (meth)acrylate.

[0015] More preferably, the compounding principle of the two expandable microspheres is that the particle size after the expansion of the expandable microspheres is less than or equal to the thickness of the foam composition product.

[0016] More preferably, the expandable microspheres are any of the following compoundings:

[0017] A: Any compounding of 551DU 40 and 920DU20, 920DU40, 920DU 80, 920DU 120, 093DU 120, 909DU 80;

[0018] B: Any combination of 051DU 40 and 920DU 20, 920DU 40, 920DU 80, 920DU 120, 930DU 120, 980DU 80, 951DU 120;

[0019] C: Any combination of 031DU 40 and 051DU 40, 909DU 80, 920DU 20;

[0020] D: Any combination of 053DU 40 and 093DU 120, 909DU80, 920DU40, 920DU 80;

[0021] E: A combination of 043DU 80 and 093DU 120;

[0022] F: Any combination of 043DU 40 and 909DU 80, 920DU 40, 920DU80, 920DU120, 930DU 120;

[0023] Preferably, when the thickness of the thin foam composition is 80 - 100 μm, select any one of the combinations of 551DU40 and 920DU 20, 551DU 40 and 920DU40, 051DU40 and 920DU20, 051DU 40 and 920DU 40, 031DU 40 and 051DU 40, 031DU 40 and 920DU 20, 053DU 40 and 920DU 40, and 043DU 40 and 920DU40;

[0024] When the thickness of the thin foam composition is 100 - 150 μm, select any one of the combinations of 551DU 40 and 920DU 20, 551DU40 and 920DU 40, 551DU 40 and 920DU 80, 551DU 40 and 909DU 80, 051DU 40 and 920DU 20, 051DU 40 and 920DU 40, 051DU 40 and 920DU 80, 051DU40 and 980DU80, 031DU 40 and 051DU 40, 031DU 40 and 909DU 80, 031DU 40 and 920DU20, 053DU40 and 909DU 80, 053DU40 and 920DU 40, 053DU 40 and 920DU 80, 043DU 40 and 909DU80, 043DU 40 and 920DU 40, and 043DU 40 and 920DU 80;

[0025] When the thickness of the thin foam composition is 150 - 200 μm, any one of the following compounding methods can be selected: compounding 551DU 40 and 093DU 120, compounding 551DU 40 and 920DU 120, compounding 051DU 40 and 920DU 120, compounding 051DU 40 and 930DU 120, compounding 051DU 40 and 951DU 120, compounding 053DU 40 and 093DU 120, compounding 043DU 80 and 093DU 120, compounding 043DU 40 and 920DU 120, and compounding 043DU 40 and 930DU 120.

[0026] A preparation method of a flexible slow - rebound polyacrylate thin foam composition, characterized in that: at room temperature, a triblock acrylic copolymer elastomer, a polyurethane methacrylate, and a cross - linker are completely dissolved in a solvent; expandable microspheres and a curing agent are added to the mixture and dispersed evenly; then it is coated on a release film, dried, foamed at high temperature, wound into a roll, and cured to obtain the flexible slow - rebound polyacrylate thin foam.

[0027] Preferably, it is foamed at high temperature between 66 - 155 °C.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0029] (1) The flexible slow - rebound polyacrylate thin foam of the present invention is produced by a coating method, with a short foaming time, which reduces its production cost.

[0030] (2) The present invention not only adjusts the resilience of the flexible slow - rebound polyacrylate thin foam by the ratio of triblock acrylic copolymer elastomers with different poly(methyl methacrylate) contents and functional polyurethane (meth)acrylates, but also increases the resilience of the foam by the different expansion particle sizes caused by the different foaming temperatures of two different expandable microsphere blowing agents with the starting expansion temperature and the maximum expansion temperature both separated by 10 - 60 °C. Therefore, the flexible slow - rebound polyacrylate thin foam provided by the present invention has excellent resilience.

[0031] (3) According to different application fields, the present invention can prepare flexible slow - rebound polyacrylate thin foams with different thicknesses, different surface impact absorption rates at the drop - ball point, and different compression strengths not only by using two expandable microsphere blowing agents with different particle sizes and different particle sizes after foaming, but also can produce flexible slow - rebound polyacrylate thin foams with different heat resistances by the high or low expansion temperatures of the expandable microsphere blowing agents.

[0032] (4) The flexible slow-rebound polyacrylate thin foam provided by the present invention achieves its high ball-drop surface impact absorption rate by adjusting the ratio of the triblock acrylic copolymer elastomer and the functional polyurethane (meth)acrylate, and achieves its lower compression strength and larger maximum compression ratio by adjusting the proportion of the expandable microsphere foaming agent. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The raw materials and manufacturers used in the embodiments are listed in Table 1.

[0035] Table 1 Raw materials and manufacturers

[0036]

[0037] Example 1:

[0038] Table 2 Formulation of components in Example 1

[0039] Raw material name Weight percentage (wt%) LA2140 6.3 6115J-80 10.0 DR-U010 10.0 DR-U116 10.2 Benzoyl peroxide 0.9 031DU 40 0.8 051DU 40 0.4 Isocyanate 0.6 Ethyl acetate 60.8

[0040] Step 1. First, dissolve all of LA2140 with ethyl acetate, and then sequentially add 6115J-80, DR-U010, DR-U116 and dibenzoyl peroxide thereto, and then disperse them evenly by stirring.

[0041] Step 2. 30 minutes before coating, add 031DU 40, 051DU 40 and isocyanate to the mixture in Step 1, and then disperse and mix them.

[0042] Step 3. Wait until the composition in Step 2 is dispersed evenly, coat the composition on the release film, first dry it between 30 and 77 °C, foam it between 77 and 120 °C, and then cure it at 70 °C for 3 hours to obtain the flexible slow-rebound polyacrylate thin foam.

[0043] The relevant performance tests of the flexible slow-rebound polyacrylate thin foam prepared in Example 1 are listed in Table 8.

[0044] Example 2:

[0045] Table 3 Formulation of components in Example 2

[0046]

[0047]

[0048] Step 1. First, completely dissolve LA2140 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, Y-1877, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0049] Steps 2 and 3 are the same as those in Example 1. The relevant performance tests of the prepared flexible slow-rebound polyacrylate thin foam are listed in Table 8.

[0050] Example 3:

[0051] Table 4 Formulation of Example 3

[0052] Raw material name Weight percentage (wt%) LA2114 4.1 LA2140 10.2 6115J-80 5.0 DR-U010 5.0 DR-U116 5.1 Benzoyl peroxide 0.4 Y-1877 4.2 920DU 20 0.5 051DU40 1.0 Isocyanate 0.3 Ethyl acetate 64.2

[0053] Step 1. First, completely dissolve LA2140 and LA2114 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, Y-1877, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0054] Step 2. 30 minutes before coating, add 920DU 20, 051DU 40, and isocyanate to the mixture in Step 1, and then disperse and mix them.

[0055] Step 3. Wait until the composition in Step 2 is dispersed evenly, coat the composition on the release film, first dry it between 30 and 77 °C, foam it between 77 and 145 °C, and then cure it at 70 °C for 3 hours to obtain the flexible slow-rebound polyacrylate thin foam.

[0056] The relevant performance tests of the flexible slow-rebound polyacrylate thin foam prepared in Example 3 are listed in Table 8.

[0057] Example 4:

[0058] Table 5 Formulation of Example 4

[0059] Raw material name Weight percentage (wt%) LA2114 4.1 LA2140 10.2 6115J-80 5.0 DR-U010 5.0 DR-U116 5.1 Benzoyl peroxide 0.4 920DU20 0.5 051DU 40 1.0 Isocyanate 0.3 Ethyl acetate 68.4

[0060] Step 1. First, completely dissolve LA2140 and LA2114 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0061] Steps 2 and 3 are the same as those in Example 3. The relevant performance tests of the prepared flexible slow-rebound polyacrylate thin foam are listed in Table 8.

[0062] Example 5:

[0063] Table 6 Formulation of Example 5

[0064] Raw material name Weight percentage (wt%) LA2250 4.1 6115J-80 5.0 DR-U010 5.0 DR-U116 5.1 Benzoyl peroxide 0.4 031DU 40 0.4 051DU 40 0.8 Isocyanate 0.3 Ethyl acetate 78.9

[0065] Step 1. First, dissolve all of LA2250 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0066] Step 2. 30 minutes before coating, add 031DU 40, 051DU 40, and isocyanate to the mixture of Step 1, and then perform dispersion mixing.

[0067] Step 3. Wait until the composition of Step 2 is dispersed evenly, coat the composition onto a release film, first dry it between 30 and 77 °C, foam it between 77 and 120 °C, and then cure it at 70 °C for 3 hours to obtain a flexible slow-rebound polyacrylate thin foam.

[0068] Example 6:

[0069] Table 7 Composition formula of Example 6

[0070] Raw material name Weight percentage (wt%) LA2114 4.1 LA2140 10.2 6115J-80 10.0 DR-U010 10.0 DR-U116 10.2 Benzoyl peroxide 0.9 920DU 20 0.5 051DU 40 1.0 Isocyanate 0.6 Ethyl acetate 48.3 Y-1877 4.2

[0071] Step 1. First, dissolve all of LA2140 and LA2114 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, Y-1877, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0072] Step 2. 30 minutes before coating, add 920DU 20, 051DU 40, and isocyanate to the mixture of Step 1, and then perform dispersion mixing.

[0073] Step 3. Wait until the composition of Step 2 is dispersed evenly, coat the composition onto a release film, first dry it between 30 and 77 °C, foam it between 77 and 145 °C, and then cure it at 70 °C for 3 hours to obtain a flexible slow-rebound polyacrylate thin foam.

[0074] Comparative Example 1: Do not add triblock acrylic copolymer elastomer.

[0075] Table 8 Composition formula of Comparative Example 1

[0076]

[0077]

[0078] Step 1. First, successively add 6115J-80, DR-U010, DR-U116, and benzoyl peroxide to ethyl acetate, and then disperse them evenly by stirring.

[0079] Steps 2 and 3 are the same as those in Example 1. The relevant performance tests of the prepared white flexible slow-rebound polyacrylate thin foam are listed in Table 8.

[0080] Comparative Example 2: No expandable microsphere foaming agent is added.

[0081] Table 9 Formulation of Comparative Example 2

[0082] Raw material name Weight percentage (wt%) LA2140 7.5 6115J-80 10.0 DR-U010 10.0 DR-U116 10.2 Benzoyl peroxide 0.9 Isocyanate 0.6 Ethyl acetate 60.8

[0083] Step 1. First, dissolve all of LA2140 with ethyl acetate, and then successively add 6115J-80, DR-U010, DR-U116, and benzoyl peroxide thereto, and then disperse them evenly by stirring.

[0084] Step 2. 30 minutes before coating, add isocyanate to the mixture in Step 1, and then disperse and mix.

[0085] Step 3 is the same as that in Comparative Example 1.

[0086] The relevant performance tests of the white flexible slow-rebound polyacrylate thin foam prepared in Comparative Example 2 are listed in Table 10.

[0087] The performance of the flexible slow-rebound polyacrylate thin foam is tested by the following methods:

[0088] The falling ball point impact absorption rate is that a stainless steel ball with a specified weight makes a free fall from a baffle 100 mm away from the sensor disc onto the sensor disc, and the force value on the sensor is read out by a computer. The test is repeated at least ten times. Among them, the average value of the force value on the sensor disc without foam is recorded as F1, and the average value of the force value on the sensor disc with the flexible slow-rebound polyacrylate thin foam is recorded as F2. The calculation formula is as follows:

[0089]

[0090] 1. The falling ball surface impact absorption rate is that a stainless steel ball with a specified weight makes a free fall from a baffle 100 mm away from the sensor disc onto a 5-mm tempered glass placed on the surface of the sensor disc, and the force value on the sensor is read out by a computer. The test is repeated at least ten times. Among them, the average value of the force value on the 5-mm tempered glass placed on the sensor disc is recorded as F3, and the average value of the force value on the 5-mm tempered glass with the flexible slow-rebound polyacrylate thin foam pasted on the sensor disc is recorded as F4. The calculation formula is as follows:

[0091]

[0092] 2. Compressive strength test

[0093] (1) Cut the flexible slow-rebound polyacrylate thin foam into pieces of 25 mm × 25 mm, stack them to a total thickness greater than 10 mm, with a quantity of 5, and measure the initial thickness H of each sample.

[0094] (2) Use the compression test mode and output mode of the TH-8203A computerized desktop tensile testing machine, test at a speed of 10 mm / min and a maximum force control value of 980 N. The 25% compression strength, 50% compression strength, and maximum compression ratio can be obtained through the TM2101 test software.

[0095] Table 10 Properties of the flexible slow-rebound polyacrylate thin foam in Examples 1-4

[0096]

[0097] Conclusion: The following conclusions can be drawn from the relevant performance tests of Examples 1-6 in Table 10:

[0098] (1) After adding the color paste (comparing Example 1 with 2 and Example 3 with 4), both the surface impact absorption rate at the ball-drop point and the maximum compression ratio decrease, while the compression strength increases.

[0099] (2) The heat resistance of the flexible slow-rebound polyacrylate thin foam made with expandable microsphere foaming agents with a high expansion temperature (Examples 3, 4, and 6) is better than that of the foam made with expandable microsphere foaming agents with a low expansion temperature (Examples 1, 2, and 5).

[0100] (3) The surface impact absorption rate of the foam without adding triblock acrylic copolymer elastomer (Comparative Example 1) is 16.14% lower than that of the foam with triblock acrylic copolymer elastomer (Example 1).

[0101] (4) The surface impact absorption rate of the foam without adding expandable microsphere foaming agent (Comparative Example 2) is 10.24% lower than that of the foam with expandable microsphere foaming agent (Example 1), and the 25% and 50% compression strengths are 0.058 MPa and 0.034 MPa higher respectively.

[0102] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flexible slow-rebound polyacrylate thin foam composition, characterized in that, It comprises the following components: (1) At least one triblock acrylic copolymer elastomer, which is an ABA-type block copolymer elastomer composed of poly(methyl methacrylate) as the hard segment and a polymer of an acrylic acid derivative with a glass transition temperature less than 0 °C as the soft segment, wherein the poly(methyl methacrylate) accounts for 5.00 - 45.00 wt% of the triblock acrylic copolymer elastomer; (2) Polyurethane (meth)acrylate; (3) At least two expandable microspheres, and the starting expansion temperature and the maximum expansion temperature of each expandable microsphere are separated by 10 - 60 °C; (4) Solvent, curing agent, crosslinking agent; Based on a total of 100.00 wt%, the triblock acrylic copolymer elastomer accounts for 4.10 - 14.3 wt%, the polyurethane (meth)acrylate accounts for 15.10 - 30.20 wt%, the expandable microspheres account for 1.20 - 1.50 wt%, the curing agent accounts for 0.30 - 0.60 wt%, the color paste accounts for 0.00 - 4.20 wt%, the solvent accounts for 48.3 - 78.9 wt%, and the crosslinking agent accounts for 0.40 - 0.90 wt%.

2. The flexible slow-rebound polyacrylate thin foam composition according to claim 1, wherein: The soft segment is one or two of n-butyl (meth)acrylate, 2-ethylhexyl acrylate, ethoxyethoxyethyl acrylate, methyl laurate acrylate, stearic acid (meth)acrylate, and isodecyl (meth)acrylate.

3. A flexible slow-rebound polyacrylate thin foam composition according to claim 1, characterized in that: The polyurethane (meth)acrylate is one or a mixture of bifunctional polyurethane (meth)acrylate, trifunctional polyurethane (meth)acrylate, tetrafunctional polyurethane (meth)acrylate, pentafunctional polyurethane (meth)acrylate, hexafunctional polyurethane (meth)acrylate, octafunctional polyurethane (meth)acrylate, decafunctional polyurethane (meth)acrylate, or pentadecafunctional polyurethane (meth)acrylate.

4. The flexible slow-rebound polyacrylate thin foam composition according to claim 1, characterized in that: The compounding principle of the two expandable microspheres is that the particle size after expansion of the expandable microspheres is less than or equal to the thickness of the foam composition product.

5. The flexible slow-rebound polyacrylate thin foam composition according to claim 4, wherein: The expandable microspheres are any of the following compoundings: A: Any compounding of 551DU 40 and 920DU 20, 920DU 40, 920DU 80, 920DU 120, 093DU 120, 909DU80; B: Any compounding of 051DU 40 and 920DU 20, 920DU 40, 920DU 80, 920DU 120, 930DU 120, 980DU80, 951DU120; C: Any compounding of 031DU 40 and 051DU 40, 909DU 80, 920DU 20; D: Any compounding of 053DU 40 and 093DU 120, 909DU 80, 920DU 40, 920DU 80; E: Compounding of 043DU 80 and 093DU 120; F: Any compounding of 043DU 40 and 909DU 80, 920DU 40, 920DU 80, 920DU 120, 930DU 120; 6. A flexible slow-rebound polyacrylate thin foam composition according to claim 5, characterized in that: When the thickness of the thin foam composition is 80-100 μm, select any one of the following compoundings: compounding of 551DU 40 and 920DU 20, compounding of 551DU 40 and 920DU 40, compounding of 051DU 40 and 920DU 20, compounding of 051DU 40 and 920DU 40, compounding of 031DU 40 and 051DU 40, compounding of 031DU 40 and 920DU 20, compounding of 053DU 40 and 920DU 40, and compounding of 043DU 40 and 920DU 40; When the thickness of the thin foam composition is 100-150 μm, select any one of the following compoundings: compounding of 551DU 40 and 920DU 20, compounding of 551DU 40 and 920DU 40, compounding of 551DU 40 and 920DU 80, compounding of 551DU 40 and 909DU 80, compounding of 051DU 40 and 920DU 20, compounding of 051DU 40 and 920DU 40, compounding of 051DU 40 and 920DU 80, compounding of 051DU 40 and 980DU 80, compounding of 031DU 40 and 051DU 40, compounding of 031DU 40 and 909DU 80, compounding of 031DU 40 and 920DU 20, compounding of 053DU 40 and 909DU 80, compounding of 053DU 40 and 920DU 40, compounding of 053DU 40 and 920DU 80, compounding of 043DU 40 and 909DU 80, compounding of 043DU 40 and 920DU 40, and compounding of 043DU 40 and 920DU 80; When the thickness of the thin foam composition is 150-200 μm, select any one of the following compoundings: compounding of 551DU 40 and 093DU 120, compounding of 551DU 40 and 920DU 120, compounding of 051DU 40 and 920DU 120, compounding of 051DU 40 and 930DU 120, compounding of 051DU 40 and 951DU 120, compounding of 053DU 40 and 093DU 120, compounding of 043DU 80 and 093DU 120, compounding of 043DU 40 and 920DU 120, and compounding of 043DU 40 and 930DU 120; 7. A preparation method of a flexible slow-rebound polyacrylate thin foam composition, characterized in that: At room temperature, completely dissolve the triblock acrylic copolymer elastomer, polyurethane methacrylate and crosslinking agent in a solvent; add the expandable microspheres and curing agent to the mixture and disperse evenly; coat it on a release film, dry it, foam it at high temperature, wind it into a roll, and cure it to obtain the flexible slow-rebound polyacrylate thin foam; Based on a total of 100.00 wt%, among which the triblock acrylic copolymer elastomer accounts for 4.10 - 14.3 wt%, the polyurethane (meth) acrylate accounts for 15.10 - 30.20 wt%, the expandable microspheres account for 1.20 - 1.50 wt%, the curing agent accounts for 0.30 - 0.60 wt%, the color paste accounts for 0.00 - 4.20 wt%, the solvent accounts for 48.3 - 78.9 wt%, and the crosslinking agent accounts for 0.40 - 0.90 wt%.

8. The preparation method of a flexible slow-rebound polyacrylate thin foam composition according to claim 7, characterized in that: High-temperature foaming is carried out between 66 and 155 °C.

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