Release paper fabric capable of being used for mold pressing integral forming and preparation method thereof

Abstract

The invention discloses a release paper fabric capable of being used for mould pressing integral forming, the release paper fabric comprises release paper, a silica gel layer and a fabric layer, the silica gel layer comprises the following components in parts by mass: 80-100 parts of silica gel, 0.1-0.3 part of a defoaming agent, 1.5-2 parts of a coupling agent and 3-15 parts of a functional material; the functional material is selected from at least one of a cool feeling aid, graphene, titanium dioxide and zinc oxide. The release paper fabric is high in applicability, has good high temperature resistance and excellent hydrolysis resistance and illumination resistance, not only can meet the processing requirements of a mold pressing integrated forming process, but also can keep stable in a high-temperature and high-humidity environment, and is not easy to degrade or discolor.

Description

Technical Field

[0001] The present invention relates to the technical field of clothing production, and particularly relates to a release paper fabric that can be used for one-piece molding by die pressing and a preparation method thereof. Background Art

[0002] Release paper fabrics have good waterproof, oil-proof and tear-resistant properties, so they can be used in products such as outdoor sportswear, hiking shoes, and handbags, thereby improving the durability and protection of the products. However, the current release paper fabrics have insufficient high-temperature resistance and insufficient tension, and will burn out or break after die pressing. These technical limitations enable the release paper to only be conventionally compounded, and cannot meet the processing requirements of higher requirements, thus affecting the applicability of the release paper fabric. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a release paper fabric that can be used for one-piece molding by die pressing and a preparation method thereof. It uses silicone as a transfer coating, which can improve its high-temperature resistance and tension, and at the same time has excellent hydrolysis resistance and light resistance, and can meet the processing requirements of one-piece molding by die pressing.

[0004] The present invention provides the following technical solutions:

[0005] The present invention provides a release paper fabric that can be used for one-piece molding by die pressing, which includes a release paper, a silicone layer and a fabric layer. The silicone layer includes the following components in parts by mass: 80-100 parts of silicone, 0.1-0.3 parts of defoamer, 1.5-2 parts of coupling agent, and 3-15 parts of functional materials; the functional materials are selected from at least one of a cool feeling aid, graphene, titanium dioxide and zinc oxide.

[0006] Preferably, the thickness of the silicone layer is 0.1-0.3 mm.

[0007] Preferably, the functional materials include a cool feeling aid, graphene, titanium dioxide and zinc oxide, and the mass ratio of the cool feeling aid, graphene, titanium dioxide and zinc oxide is (3-8):(1-5):(2-5):(2-5). The cool feeling aid can endow the release paper fabric with a cool feeling; the graphene can improve the light-shielding and heat-insulating effects; the titanium dioxide and zinc oxide can jointly provide an anti-ultraviolet effect; the graphene and zinc oxide can endow the release paper fabric with an antibacterial effect.

[0008] Preferably, the median particle size of the titanium dioxide is 50-200 nm.

[0009] Preferably, the median particle size of the zinc oxide is 20-100 nm.

[0010] Preferably, the graphene is silane-modified graphene.

[0011] Preferably, the silicone layer further comprises 5-8 parts by mass of a diluent.

[0012] Preferably, the cool feeling aid is selected from one of xylitol microcapsules, mineral cool feeling agents and paraffin microcapsules.

[0013] Preferably, the coupling agent is a silane coupling agent.

[0014] Furthermore, the silicone layer and the release paper are adhered together by glue, and the silicone layer and the fabric layer are compounded together by hot pressing.

[0015] The present invention also provides a preparation method of the above-mentioned release paper fabric for integral molding by die pressing, which is characterized by comprising the following steps:

[0016] S1. Prepare silicone slurry, add a coupling agent to liquid silicone and stir evenly, then add functional materials and stir, after dispersing evenly, add an antifoaming agent and stir until there are no bubbles on the surface;

[0017] S2. Uniformly coat glue on the surface of the release paper, then cover with the silicone slurry to prepare a silicone layer, and carry out pre-curing by UV light. When the curing degree of the silicone slurry reaches 30-50%, cover the fabric layer on the silicone layer, heat to 100-120 °C and carry out pre-pressing under a pressure of 1-2 MPa, then heat to 150-180 °C and carry out hot pressing and compounding under a pressure of 5-10 MPa to obtain a release paper fabric for integral molding by die pressing.

[0018] Preferably, the curing time of the UV light is 10-30 s.

[0019] Preferably, the pre-pressing time is 1-3 min, and the hot pressing time is 2-3 min.

[0020] Preferably, the functional materials include a cool feeling aid, graphene, titanium dioxide and zinc oxide. First add titanium dioxide and zinc oxide, stir evenly and then add graphene, disperse evenly, and finally add the cool feeling aid to avoid the cool feeling aid being coated by the other functional materials and thus affecting its effect.

[0021] The present invention has the following technical effects:

[0022] The release paper fabric of the present invention uses silicone as the transfer coating, which can endow the release paper fabric with good high-temperature resistance, excellent hydrolysis resistance and light resistance. It can not only meet the processing requirements of the compression molding and one-step forming process, but also maintain stability in high-temperature and high-humidity environments and is not prone to degradation or discoloration. Secondly, the silicone layer also has high elasticity and abrasion resistance, making the release paper fabric not prone to creases and wrinkles. Adding functional materials to the silicone layer can further improve the functionality of the release paper fabric. The release paper fabric on the reverse side of this invention adopts a solvent-free technology, has no peculiar smell and good environmental performance. Detailed Embodiments

[0023] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0024] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0025] To more fully understand the technical content of the present invention, the technical solutions of the present invention will be further introduced and described below in conjunction with specific embodiments.

[0026] Embodiment 1

[0027] A release paper fabric applicable to compression molding and one-step forming includes a release paper, a silicone layer and a fabric layer. The silicone layer includes the following components in parts by mass: 100 parts of silicone, 0.3 parts of defoamer, 2 parts of silane coupling agent, 11 parts of functional materials and 6 parts of diluent.

[0028] The functional materials include 4 parts of paraffin microcapsules, 2 parts of silane-modified graphene, 2 parts of titanium dioxide and 3 parts of zinc oxide.

[0029] The preparation method of the release paper fabric applicable to compression molding and one-step forming in this embodiment includes the following steps:

[0030] S1. Prepare the silicone slurry. By mass, add the diluent to the liquid silicone and mix evenly, then add the silane coupling agent and stir evenly; add titanium dioxide and zinc oxide, disperse evenly, then add silane-modified graphene and disperse evenly, then add paraffin microcapsules and mix evenly; finally add the defoamer and stir until there are no bubbles on the surface;

[0031] S2. Uniformly coat glue on the surface of the release paper, then cover it with a silicone slurry with a thickness of 0.3 mm to prepare a silicone layer, and perform pre-curing for 30 s by UV light irradiation. When the curing degree of the silicone slurry reaches 50%, cover the fabric layer on the silicone layer, heat it to 120 °C and perform pre-pressing for 1.5 min under a pressure of 1.5 MPa, then heat it to 180 °C and perform high-temperature pressing and compounding for 2 min under a pressure of 8 MPa to obtain a release paper fabric that can be used for one-step molding by die pressing.

[0032] Example 2

[0033] A release paper fabric that can be used for one-step molding by die pressing, which includes a release paper, a silicone layer and a fabric layer. The silicone layer includes the following components in parts by mass: 95 parts of silicone, 0.2 part of defoamer, 2 parts of silane coupling agent, 15 parts of functional material and 8 parts of diluent.

[0034] The functional material includes 6 parts of mineral cool feeling agent, 3 parts of silane-modified graphene, 3 parts of titanium dioxide and 3 parts of zinc oxide.

[0035] The preparation method of the release paper fabric that can be used for one-step molding by die pressing in this example includes the following steps:

[0036] S1. Prepare a silicone slurry. By mass, add a diluent to liquid silicone and mix evenly, then add a silane coupling agent and stir evenly; add titanium dioxide and zinc oxide, after dispersing evenly, then add silane-modified graphene and disperse evenly, and then add a mineral cool feeling agent and mix evenly; finally, add a defoamer and stir until there are no bubbles on the surface;

[0037] S2. Uniformly coat glue on the surface of the release paper, then cover it with a silicone slurry with a thickness of 0.3 mm to prepare a silicone layer, and perform pre-curing for 20 s by UV light irradiation. When the curing degree of the silicone slurry reaches 40%, cover the fabric layer on the silicone layer, heat it to 100 °C and perform pre-pressing for 2 min under a pressure of 2 MPa, then heat it to 160 °C and perform high-temperature pressing and compounding for 1 min under a pressure of 10 MPa to obtain a release paper fabric that can be used for one-step molding by die pressing.

[0038] Example 3

[0039] A release paper fabric that can be used for one-step molding by die pressing, which includes a release paper, a silicone layer and a fabric layer. The silicone layer includes the following components in parts by mass: 80 parts of silicone, 0.1 part of defoamer, 1.5 parts of silane coupling agent, 3 parts of xylitol microcapsules.

[0040] The preparation method of the release paper fabric that can be used for one-step molding by die pressing in this example includes the following steps:

[0041] S1. Prepare the silica gel slurry. By mass fraction, add a silane coupling agent to the liquid silica gel and stir evenly; then add xylitol microcapsules and mix evenly; finally, add an antifoaming agent and stir until there are no bubbles on the surface.

[0042] S2. Uniformly coat glue on the surface of the release paper, and then cover it with a silica gel slurry with a thickness of 0.3 mm to prepare a silica gel layer. Use UV light to pre-cure for 10 s. When the curing degree of the silica gel slurry reaches 40%, cover the fabric layer on the silica gel layer, heat to 110 °C and pre-press for 3 min under a pressure of 1 MPa, then heat to 160 °C and perform high-temperature pressing and compounding for 3 min under a pressure of 5 MPa to obtain a release paper fabric that can be used for one-piece molding by die pressing.

[0043] Example 4

[0044] A release paper fabric that can be used for one-piece molding by die pressing, which includes a release paper, a silica gel layer and a fabric layer. The silica gel layer includes the following components by mass fraction: 90 parts of silica gel, 0.2 part of antifoaming agent, 1.8 parts of silane coupling agent, 7 parts of functional material and 5 parts of diluent.

[0045] The functional material includes 5 parts of mineral cool feeling agent and 2 parts of silane-modified graphene.

[0046] The preparation method of the release paper fabric that can be used for one-piece molding by die pressing in this example includes the following steps:

[0047] S1. Prepare the silica gel slurry. By mass fraction, add a diluent to the liquid silica gel and mix evenly, then add a silane coupling agent and stir evenly; add silane-modified graphene and disperse evenly, then add a mineral cool feeling agent and mix evenly; finally, add an antifoaming agent and stir until there are no bubbles on the surface.

[0048] S2. Uniformly coat glue on the surface of the release paper, and then cover it with a silica gel slurry with a thickness of 0.3 mm to prepare a silica gel layer. Use UV light to pre-cure for 15 s. When the curing degree of the silica gel slurry reaches 30%, cover the fabric layer on the silica gel layer, heat to 100 °C and pre-press for 2 min under a pressure of 1.5 MPa, then heat to 150 °C and perform high-temperature pressing and compounding for 3 min under a pressure of 8 MPa to obtain a release paper fabric that can be used for one-piece molding by die pressing.

[0049] To illustrate the technical effects of the present invention, the release paper fabrics of Examples 1-4 were used to prepare hats by one-piece molding by die pressing. Among them, the temperature of one-piece molding by die pressing was 200 °C and the time was 210 s. The appearance of the hats prepared in Examples 1-4 was observed, and their appearances were all complete, without discoloration or cracking, indicating that they can be applied to the one-piece molding by die pressing process.

[0050] For the hats prepared in Examples 1-4, referring to the AATCC 195-2019 standard, the Q-max cool feeling degree after 0 and 5 washes was tested using a heat flow tester, and the test results are shown in Table 1 below:

[0051] Table 1 Results of anti-deformation test and appearance observation

[0052] Q-max value after 0 water washings Q-max value after 5 water washings Example 1 0.25 0.21 Example 2 0.21 0.18 Example 3 0.22 0.19 Example 4 0.20 0.178

[0053] As shown in Table 1, the hats made from the release paper fabric of the present invention after die pressing and integral forming have good cool feeling degree, and can still maintain more than 80% of the Q-max value after 5 washes, indicating that it has good cool feeling durability.

[0054] To further illustrate the technical effects of the present invention, Comparative Examples 1-7 were set up on the basis of Example 1 as follows:

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 1 is only that it does not contain functional materials.

[0057] Comparative Example 2

[0058] The difference between this comparative example and Example 1 is only that it does not include a silica gel layer.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 1 is only that the mass fraction of graphene is 5 parts, and the graphene is unmodified graphene.

[0061] Comparative Example 4

[0062] The difference between this comparative example and Example 1 is only that the fabric layer is covered on the silica gel layer when the curing degree of the silica gel slurry is 20%.

[0063] Comparative Example 5

[0064] The difference between this comparative example and Example 1 is only that the fabric layer is covered on the silica gel layer when the curing degree of the silica gel slurry is 60%.

[0065] Comparative Example 6

[0066] The difference between this comparative example and Example 1 is only that the cool feeling aid, silane-modified graphene, titanium dioxide and zinc oxide are simultaneously added to the silica gel slurry for mixing.

[0067] Comparative Example 7

[0068] The difference between this comparative example and Example 1 is only that the pre-pressing pressure is 1 MPa and the pressing and compounding pressure is 12 MPa.

[0069] To better illustrate the technical effects of the present invention, visual inspection, heat resistance test, cool feeling test, mechanical property test and UV resistance test were respectively carried out on Example 1 and Comparative Examples 1-7. The test results are shown in Table 2 below.

[0070] Among them, for the heat resistance test, the release paper fabrics of Example 1 and Comparative Examples 1-7 were placed at 200 °C for 24 h to conduct a thermal aging test, and whether there were phenomena such as cracking, delamination or yellowing of the fabric was observed.

[0071] For the mechanical property test, the peel strength of the release paper fabrics of Example 1 and Comparative Examples 1-7 was tested according to ASTM D903 standard.

[0072] For the UV resistance test: The release paper fabrics of Example 1 and Comparative Examples 1-7 were irradiated with ultraviolet rays under the same conditions, and the cracking and yellowing conditions were observed after 10 days of irradiation.

[0073] Table 2 Results of visual inspection, heat resistance test, mechanical properties and UV resistance test

[0074]

[0075]

[0076] As shown in Table 2, when the technical solution of the present invention is changed, it has a certain negative impact on the appearance and various properties of the prepared release paper fabric. When the silicone layer is not used, the release paper fabric cannot meet the process requirements of compression molding due to insufficient high-temperature resistance and tension; when the functional materials and their preparation processes of the present invention are changed, it is easy to affect the efficacy of each different functional material itself; when the preparation process parameters of the present invention are changed, it is easy to affect the appearance and peel strength of the product.

[0077] Therefore, the release paper fabric of the present invention can meet the process requirements of compression molding, and at the same time, functional materials can be added under the condition of ensuring strength, adding new effects to the release paper fabric while further improving the UV resistance and heat resistance effects.

[0078] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A release paper fabric that can be used for integrated molding, characterized in that: It comprises release paper, a silicone layer and a fabric layer, wherein the silicone layer comprises the following components in parts by weight: 80-100 parts of silicone, 0.1-0.3 parts of a defoaming agent, 1.5-2 parts of a coupling agent and 3-15 parts of a functional material; the functional material is selected from at least one of a cooling agent, graphene, titanium dioxide and zinc oxide.

2. The release paper fabric for integrated molding according to claim 1, characterized in that: The functional material comprises a cooling agent, graphene, titanium dioxide and zinc oxide, wherein the mass ratio of the cooling agent, graphene, titanium dioxide and zinc oxide is (3-8): (1-5): (2-5): (2-5).

3. The release paper fabric for integrated molding according to claim 1, characterized in that: The graphene is silane-modified graphene.

4. The release paper fabric for integrated molding according to claim 3, characterized in that: The silica gel layer also includes 5-8 parts by weight of a diluent.

5. The release paper fabric for integrated molding according to claim 1, characterized in that: The cooling agent is selected from one of xylitol microcapsules, mineral cooling agents and paraffin microcapsules.

6. The release paper fabric for integrated molding according to claim 1, characterized in that: The coupling agent is a silane coupling agent.

7. The release paper fabric for integrated molding according to claim 1, characterized in that: The silicone layer and the release paper are bonded together by glue, and the silicone layer and the fabric layer are compounded together by high-temperature pressing.

8. The method for preparing a release paper fabric that can be used for integrated molding according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Prepare silica gel slurry, add coupling agent to liquid silica gel and stir evenly, then add functional material and stir, add defoamer after evenly dispersing, and stir until there are no bubbles on the surface; S2. Apply glue evenly on the surface of the release paper, then cover it with silicone slurry to prepare a silicone layer, use UV light to pre-cure, and when the curing degree of the silicone slurry reaches 30-50%, cover the fabric layer on the silicone layer, heat it to 100-120°C and pre-press it at a pressure of 1-2MPa, then heat it to 150-180°C, and perform high-temperature pressing and compounding at a pressure of 5-10MPa to obtain a release paper fabric that can be used for one-piece molding.

9. The method for preparing a release paper fabric that can be used for integrated molding according to claim 8, characterized in that: The UV light curing time is 10-30s.

10. The method for preparing a release paper fabric that can be used for integrated molding according to claim 8, characterized in that: The pre-pressing time is 1-3 minutes, and the high-temperature pressing time is 2-3 minutes.

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