An air hole improver, its preparation method and application

Abstract

The application provides a pore modifier, a preparation method and application thereof. The pore modifier comprises 0.3-2.5 parts of polydimethylsiloxane, 0.08-1.5 parts of hydroxyl polysiloxane and 0.3-3 parts of C8-C15 alkyl modified polysiloxane by weight. The pore modifier can effectively improve the pores on the surface of a polyurethane product, is beneficial to demolding of the polyurethane product, has less mold residues, and the obtained polyurethane product has good skin quality and is basically free of corrosion.

Description

Technical Field

[0001] This invention belongs to the field of mold release material technology, specifically relating to a porosity improver, its preparation method, and its application. Background Technology

[0002] Polyurethane foam materials typically include physical foaming and chemical foaming. Physical foaming involves the vaporization of physical foaming agents such as 141b and dichloromethane upon heating; chemical foaming involves the reaction of water with isocyanate to produce carbon dioxide. During the foam molding process, if the material does not completely impregnate the mold, air pockets will appear in the unimpregnated areas, affecting product performance and production efficiency.

[0003] Currently, common methods for improving porosity include directly blending plasticizers into the A component of polyurethane to increase the material's spreading rate on the mold surface. However, adding plasticizers can lead to issues such as easy migration and poor compatibility; therefore, the effect on improving porosity needs further improvement.

[0004] In addition, mold release agents are typically used to ensure a smooth separation between the molding material and the mold; a mold release agent is a type of release film between the product and the mold. Traditionally, mold release agents used in the polyurethane industry are divided into water-based and oil-based agents. Oil-based mold release agents usually use a large amount of solvent, which can easily damage the environment, while water-based mold release agents use water as the solvent, making them more environmentally friendly. However, traditional water-based mold release agents for polyurethane are prone to the following problems: 1. Polyurethane material adheres to the mold; 2. Residue remains on the mold surface, affecting and corroding the surface of the polyurethane product; 3. Ineffective wetting of the mold surface, affecting the surface molding condition of the polyurethane product.

[0005] Therefore, developing a porosity improver that can effectively improve the porosity of polyurethane surfaces, prevent polyurethane materials from sticking to molds, provide good demolding performance, and effectively improve the surface quality and production efficiency of polyurethane products is an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a pore-improving agent, its preparation method, and its application. The pore-improving agent effectively improves the porosity of polyurethane products, facilitates demolding, reduces mold residue, and results in polyurethane products with high-quality skin and minimal corrosion.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a pore improver, which, by weight, comprises 0.3 to 2.5 parts of polydimethylsiloxane, 0.08 to 1.5 parts of hydroxyl polysiloxane, and 0.3 to 3 parts of C8 to C15 alkyl-modified polysiloxane.

[0009] In this invention, polydimethylsiloxane, hydroxyl polysiloxane, and C8-C15 alkyl-modified polysiloxane are compounded in specific amounts to obtain a pore improver that can effectively improve the pores on the surface of polyurethane products, making the polyurethane easy to demold, with less mold residue, and the resulting polyurethane products have good surface quality and are basically free from corrosion.

[0010] In this invention, 0.3 to 2.5 parts of polydimethylsiloxane can be, for example, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, etc.

[0011] In this invention, if the content of polydimethylsiloxane is too high, the storage stability of the porosity improver will be poor and product residue will remain on the mold surface after demolding; if the content is too low, the wetting effect of the porosity improver will be poor.

[0012] In this invention, 0.08 to 1.5 parts of hydroxyl polysiloxane can be, for example, 0.08 parts, 0.085 parts, 0.09 parts, 0.095 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, 0.8 parts, 0.85 parts, 0.9 parts, 0.95 parts, 1 part, 1.05 parts, 1.1 parts, 1.15 parts, 1.2 parts, 1.25 parts, 1.3 parts, 1.35 parts, 1.4 parts, 1.45 parts, 1.5 parts, etc.

[0013] In this invention, if the content of the hydroxyl polysiloxane is too high, it will easily corrode the surface of the polyurethane product; if the content is too low, the stability of the pore improver will be poor.

[0014] In this invention, 0.3 to 3 parts of C8 to C15 alkyl-modified polysiloxane can be, for example, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, etc.

[0015] In this invention, if the content of the C8-C15 alkyl-modified polysiloxane is too high, it will cause oil damage on the surface of the polyurethane product and leave residues on the mold surface after demolding; if the content is too low, it will affect the wetting effect of the porosity improver and the porosity improvement effect on the polyurethane surface.

[0016] In this invention, the polydimethylsiloxane has the following structure: n is selected from an integer ≥10, such as ≥10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, etc.; more preferably, it is an integer between 10 and 30.

[0017] Preferably, the number average molecular weight of the polydimethylsiloxane is 1300 to 4000, for example, it can be 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3600, 3800, 4000, etc.

[0018] Preferably, the hydroxyl polysiloxane has the structure shown in Formula I.

[0019]

[0020] In Formula I, n1 is selected from integers ≥10, such as ≥10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, etc.; more preferably, it is an integer between 10 and 30.

[0021] Preferably, the number average molecular weight of the hydroxyl polysiloxane is 1300 to 4000, for example, it can be 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3600, 3800, 4000, etc.

[0022] Preferably, the C8-C15 alkyl-modified polysiloxane has the structure shown in Formula II.

[0023]

[0024] In Formula II, R3, R4, R5, and R6 are each independently selected from H, C1 to C15 straight-chain or branched alkyl groups, and at least one of R3, R4, R5, and R6 is selected from C8 to C15 straight-chain alkyl groups; n3 is selected from an integer ≥5, for example, it can be 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, etc.; n4 is selected from an integer ≥1, for example, it can be 1, 2, 4, 6, 8, 10, 12, 14, 15, 16, 18, 20, etc.

[0025] In this invention, the C1-C15 straight-chain or branched alkyl groups can be, for example, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, or C15 straight-chain or branched alkyl groups; exemplary, including but not limited to methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, n-octyl, isooctyl, n-nonyl, n-decyl, n-dodecyl, n-tetradecyl, etc.; the C8-C15 straight-chain alkyl groups can be, for example, C8, C9, C10, C11, C12, C13, C14, or C15 straight-chain alkyl groups; exemplary, including but not limited to n-octyl, n-nonyl, n-decyl, n-dodecyl, n-tetradecyl, etc., preferably at least one of n-octyl, n-decyl, n-dodecyl, and n-tetradecyl, particularly preferably one of n-dodecyl and n-tetradecyl.

[0026] Preferably, in Formula II, n3 is selected from integers from 5 to 10, and n4 is selected from integers from 1 to 15.

[0027] Preferably, the number average molecular weight of the C8-C15 alkyl-modified polysiloxane is 1500-6000, for example, it can be 1500, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000, 4200, 4400, 4600, 4800, 5000, 5200, 5600, 5800, 6000, etc.

[0028] Preferably, the pore improver further comprises 1 to 4 parts by weight of long-chain alkyl alcohol polyethylene glycol ether, for example, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, 4 parts, etc.

[0029] Preferably, the long-chain alkyl alcohol polyethylene glycol ether has the structure shown in Formula III.

[0030]

[0031] In Formula III, R1 and R2 are each independently selected from C10 to C15 straight-chain alkyl groups; n2 is selected from integers from 100 to 150.

[0032] In this invention, the C10 to C15 straight-chain alkyl group can be, for example, a C10, C11, C12, C13, C14, or C15 straight-chain alkyl group; exemplary, including but not limited to at least one of n-decyl, n-dodecyl, and n-tetradecyl; more preferably n-dodecyl and / or n-tetradecyl.

[0033] In this invention, n2 is selected from integers from 100 to 150, such as 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, etc.

[0034] In this invention, the number average molecular weight of the long straight-chain alkyl alcohol polyethylene glycol ether is 4000 to 7000, for example, it can be 4000, 4200, 4400, 4600, 4800, 5000, 5200, 5400, 5600, 5800, 6000, 6200, 6400, 6600, 6800, 7000, etc.

[0035] In this invention, the ether segment of the long-chain alkyl alcohol polyethylene glycol ether is highly polar, while the terminal long alkyl chain is highly nonpolar. Even with a small molecular weight, it can further improve the emulsifying performance, effectively disperse and emulsify hydroxyl polysiloxanes with a certain degree of polarity, and form a stable emulsion in the aqueous system. In addition, the excellent dispersibility of the long-chain alkyl alcohol polyethylene glycol ether can also effectively improve the uniformity of each component in the pore modifier.

[0036] Preferably, the pore improver further comprises 1 to 7 parts of surfactant by weight, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts, 6.2 parts, 6.4 parts, 6.6 parts, 6.8 parts, 7 parts, etc.

[0037] Preferably, the surfactant includes any one or a combination of at least two of cationic emulsifiers, anionic emulsifiers, and nonionic surfactants.

[0038] Preferably, the surfactant comprises any one or a combination of at least two of sodium dodecyl sulfate, polyoxyethylene sorbitan monooleate (Tween-80), sorbitan anhydride monooleate (SPAN-80), glyceryl monostearate, and octylphenyl polyoxyethylene ether (Triton); more preferably, sodium dodecyl sulfate and / or octylphenyl polyoxyethylene ether.

[0039] Preferably, the mass ratio of the polydimethylsiloxane, hydroxyl polysiloxane, and C8-C15 alkyl-modified polysiloxane is (0.4-2.5):1:(0.4-2.5), wherein the specific values ​​in (0.4-2.5) can be independently, for example, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc., and the preferred mass ratio is (0.4-2.0):1:(0.4-2.0).

[0040] Preferably, the pore improver further includes 30 to 110 parts of solvent by weight, for example, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 78 parts, 80 parts, 82 parts, 85 parts, 88 parts, 90 parts, 92 parts, 95 parts, 98 parts, 100 parts, 102 parts, 105 parts, 110 parts, etc.

[0041] Preferably, the solvent includes water.

[0042] In a second aspect, the present invention provides a method for preparing the pore improver described in the first aspect, the method comprising the following steps:

[0043] The porosity improver is obtained by mixing polydimethylsiloxane, hydroxyl polysiloxane, and C8-C15 alkyl-modified polysiloxane.

[0044] Preferably, the mixed material further includes at least one of long-chain alkyl alcohol polyethylene glycol ethers, surfactants, and solvents.

[0045] Preferably, the mixing is performed under ultrasonic conditions.

[0046] In this invention, the power of the ultrasound is 400-800W, for example, it can be 400W, 500W, 600W, 700W, 800W, etc.

[0047] Preferably, the mixing time is ≥3h, for example, it can be 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, etc.

[0048] In this invention, the preparation method includes: mixing polydimethylsiloxane, hydroxyl polysiloxane, C8-C15 alkyl-modified polysiloxane, long-chain alkyl alcohol polyethylene glycol ether, surfactant and a portion of solvent (accounting for 30-60% of the total solvent mass) uniformly, then adding the remaining solvent, and mixing for 3 hours or more under ultrasonic power of 400-800W to obtain the porosity improver.

[0049] Thirdly, the present invention provides an application of the porosity improver described in the first aspect in polyurethane demolding.

[0050] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] The polyurethane pore improver provided by this invention is a compound of polydimethylsiloxane, hydroxyl polysiloxane and C8-C15 alkyl-modified polysiloxane in specific amounts. The resulting pore improver can effectively improve the pores on the surface of polyurethane products, making the polyurethane easy to demold, with less mold residue, and the resulting polyurethane products have good surface quality and are basically non-corrosive. Detailed Implementation

[0053] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0054] All materials used in this invention are commercially available or prepared using conventional methods; unless otherwise specified, the materials used in this invention are as follows:

[0055] Polydimethylsiloxane: The number average molecular weight (Mn) is approximately 2100, and the polydimethylsiloxane has the structure shown in Formula IV.

[0056]

[0057] Hydroxypolysiloxane: with a number-average molecular weight of approximately 2100, the hydroxypolysiloxane has the structure shown in Formula V.

[0058]

[0059] C14 alkyl-modified polysiloxane: number average molecular weight is about 3200, and the C14 alkyl-modified polysiloxane has the structure shown in Formula VI.

[0060]

[0061] Long-chain alkyl alcohol polyethylene glycol ether: with a number average molecular weight of approximately 4700, the long-chain alkyl alcohol polyethylene glycol ether has the structure shown in Formula VII.

[0062]

[0063] It should be noted that the differences between polydimethylsiloxanes, hydroxyl polysiloxanes, C8-C15 alkyl-modified polysiloxanes, and long straight-chain alkyl alcohol polyethylene glycol ethers with different number-average molecular weights lie only in their degree of polymerization, i.e., n, n1, n3, n4, and n2. Unless otherwise specified, C8-C15 alkyl refers to straight-chain alkyl. The structure of C8-C15 alkyl-modified polysiloxanes with different alkyl groups is the same as that of Formula VI, except that the C14 alkyl group is replaced by any one of the other C8-C15 alkyl groups.

[0064] Examples 1-20, Comparative Examples 1-4

[0065] Examples 1-20 and Comparative Examples 1-4 each provide a pore improver, the formulations of which are shown in Tables 1-4; wherein, " / " indicates that the component is not in the formulation; "mass ratio of the three" indicates the mass ratio of polydimethylsiloxane, hydroxyl polysiloxane and C8-C15 alkyl-modified polysiloxane; the preparation method of the pore improver includes: mixing hydroxyl polysiloxane, optional long straight-chain alkyl alcohol polyethylene glycol ether, C8-C15 alkyl-modified polysiloxane, surfactant and 34.5% of the formulation amount of deionized water, stirring evenly, continuing to add polydimethylsiloxane and stirring evenly, adding the remaining deionized water and stirring evenly, and sonicating at 600W power for 3h to obtain the pore improver.

[0066] Table 1

[0067]

[0068]

[0069] Table 2

[0070]

[0071] Table 3

[0072]

[0073]

[0074] Table 4

[0075]

[0076] Application examples

[0077] This application example provides the application of the pore improver provided in Examples 1-20 and Comparative Examples 1-4 in the demolding of polyurethane shoe materials.

[0078] The preparation method of polyurethane footwear material includes the following steps:

[0079] (1) Preparation of component A: Select the JF-P-8051 product from Huafeng New Materials Co., Ltd., add an appropriate amount of foaming agent (water, with a mass of 0.6% of the total mass of component A) and catalyst (organic amine catalyst, with a mass of 0.5% of component A), mix at 40℃ for 10 min, discharge and seal for storage to obtain component A (a polyol component).

[0080] (2) Preparation of component B: The product JF-I-8021 from Huafeng New Materials Co., Ltd. was selected as the isocyanate component.

[0081] (3) Spraying of pore improver: The pore improver of the above embodiment or comparative example is loaded into the spraying equipment (the effective content of the sprayed pore improver is the same, that is, the total content of other components excluding water), and sprayed evenly onto the shoe sole mold at 45℃~55℃. Then, the solvent on the surface of the mold is dried with an air gun to complete the spraying of the mold release agent on the surface of the shoe sole mold.

[0082] (4) Mix components A and B evenly, controlling the molar ratio of reactive groups to isocyanate groups in component A to isocyanate groups in component B to be 1:1. Inject the mixture into a mold, react at 60°C for 4 minutes, mold, demold, and cure at 65°C for 24 hours to obtain the polyurethane resin shoe sole molded product. By controlling the mass of components A and B injected into the mold to be consistent and ensuring sufficient foaming, a density of 0.45 g / cm³ is obtained for both components. 3 Polyurethane resin molded shoe soles.

[0083] The obtained polyurethane resin molded shoe soles were subjected to performance tests, and the test methods are as follows:

[0084] (1) Molding density: Tested using the drainage method;

[0085] (2) Forming pore grade (number of pores on the bottom surface of the formed shoe sole): The pore condition on the bottom surface of the shoe sole is observed by visual inspection. Grade A is the best and Grade E is the worst. Grade A means that there are about 20-30 pores in the groove of the pattern on the bottom of the formed shoe sole. For each grade decrease, the number of pores increases by about 15.

[0086] (3) Demolding condition: Class A is determined by the number of demolding times after a single spraying of the porosity improver. Class A is three consecutive demoldings with no resin residue, Class B is two consecutive demoldings with no resin residue, Class C is one demolding with no resin residue, and Class D is a single spraying with resin residue.

[0087] (4) Oil damage area: During the molding process of polyurethane shoe soles, the presence of pore improver on the mold surface may cause local depressions on the bottom surface of the molded polyurethane shoe sole. The area of ​​the depression is called the oil damage area. The oil damage area is obtained by calculating the percentage of the depression area to the shoe sole area.

[0088] (5) Corrosion area: During the molding process of polyurethane shoe soles, the presence of pore improvers on the mold surface may cause local corrosion-like pits (i.e., skin corrosion) to appear on the side skin of the shoe sole. The corrosion area is obtained by calculating the percentage of the corrosion area to the side area of ​​the shoe sole.

[0089] The specific test results are shown in Table 5. Among them, the commercially available porosity modifier W-1615 product from Guangdong Baosheng Polyurethane Technology Co., Ltd. was used as control group 1; and the commercially available porosity modifier 13186 product from Ruian Xinquan Chemical Co., Ltd. was used as control group 2.

[0090] Table 5

[0091]

[0092]

[0093] As shown in Table 1, the polyurethane pore improver provided by the present invention is a compound of polydimethylsiloxane, hydroxyl polysiloxane and C8-C15 alkyl-modified polysiloxane in a specific amount. The resulting pore improver can effectively improve the pores on the surface of polyurethane products, making the polyurethane easy to demold, with less mold residue, and the resulting polyurethane products have good surface quality and are basically free from corrosion.

[0094] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pore improver, characterized in that, The pore improver comprises, by weight, 0.3 to 2.5 parts of polydimethylsiloxane, 0.08 to 1.5 parts of hydroxyl polysiloxane, and 0.3 to 3 parts of C8 to C15 alkyl-modified polysiloxane.

2. The porosity improver according to claim 1, characterized in that, The number-average molecular weight of the polydimethylsiloxane is 1300–4000; Preferably, the hydroxyl polysiloxane has the structure shown in Formula I: In Formula I, n1 is selected from integers ≥ 10; Preferably, the number-average molecular weight of the hydroxyl polysiloxane is 1300 to 4000.

3. The porosity improver according to claim 1 or 2, characterized in that, The C8-C15 alkyl-modified polysiloxane has the structure shown in Formula II; In Formula II, R3, R4, R5, and R6 are each independently selected from H, C1 to C15 straight-chain or branched alkyl groups, and at least one of R3, R4, R5, and R6 is selected from C8 to C15 straight-chain alkyl groups. n3 is selected from integers ≥5, and n4 is selected from integers ≥1; Preferably, in formula II, n3 is selected from integers from 5 to 10, and n4 is selected from integers from 1 to 15; Preferably, the number average molecular weight of the C8-C15 alkyl-modified polysiloxane is 1500-6000.

4. The porosity improver according to any one of claims 1 to 3, characterized in that, The pore improver further includes 1 to 4 parts by weight of long-chain alkyl alcohol polyethylene glycol ether; Preferably, the long-chain alkyl alcohol polyethylene glycol ether has the structure shown in Formula III; In Formula III, R1 and R2 are each independently selected from C10 to C15 straight-chain alkyl groups; n2 is selected from integers from 100 to 150.

5. The porosity improver according to any one of claims 1 to 4, characterized in that, The pore improver further includes 1 to 7 parts by weight of surfactant; Preferably, the surfactant comprises any one or a combination of at least two of cationic emulsifiers, anionic emulsifiers, and nonionic surfactants; Preferably, the surfactant comprises any one or a combination of at least two of sodium dodecyl sulfate, polyoxyethylene sorbitan monooleate, sorbitan anhydride monooleate, glyceryl monostearate, and octylphenyl polyoxyethylene ether; more preferably, sodium dodecyl sulfate and / or octylphenyl polyoxyethylene ether.

6. The porosity improver according to any one of claims 1 to 5, characterized in that, The mass ratio of polydimethylsiloxane, hydroxyl polysiloxane and C8-C15 alkyl-modified polysiloxane is (0.4-2.5):1:(0.4-2.5), preferably (0.4-2.0):1:(0.4-2.0).

7. The porosity improver according to any one of claims 1 to 6, characterized in that, The porosity improver further includes 30 to 110 parts of solvent by weight; Preferably, the solvent includes water.

8. A method for preparing a pore improver according to any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: The porosity improver is obtained by mixing polydimethylsiloxane, hydroxyl polysiloxane, and C8-C15 alkyl-modified polysiloxane.

9. The preparation method according to claim 8, characterized in that, The mixed material also includes at least one of long-chain alkyl alcohol polyethylene glycol ethers, surfactants, or solvents; Preferably, the mixing is performed under ultrasonic conditions; Preferably, the mixing time is ≥3h.

10. The application of a porosity modifier according to any one of claims 1 to 7 in polyurethane demolding.

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