Silica gel leather attached polyurethane sponge product and preparation method thereof

Abstract

The invention provides a silica gel leather attached polyurethane sponge product and a preparation method thereof, and belongs to the technical field of composite material products. The composite material comprises a release film layer, a hand feeling layer, a silica gel leather layer and a polyurethane sponge layer from top to bottom, and the silica gel leather attached polyurethane sponge product is creatively prepared by utilizing the preparation method provided by the invention; the problems that odor / VOC of an existing PVC leather attached polyurethane sponge product and an existing PU leather attached polyurethane sponge product for automobile interiors exceeds the standard, aging, yellowing and falling are prone to occurring, and cleaning and maintenance are not easy are effectively solved, and the problems that genuine leather (cowhide, sheepskin and pigskin) attached polyurethane sponge products are small in quantity and high in price are effectively solved. And a brand new choice is provided for the automotive trim industry.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material products and relates to a silicone leather laminated polyurethane sponge product and a preparation method thereof. Background Art

[0002] With the increase in the number of cars and the increasing demand for car riding comfort among car consumers, the automotive industry chain has put forward higher and higher requirements for automotive interior materials. Among them, odor / VOC, aging, yellowing / falling, cleaning and maintenance and other issues have become the focus of attention of automobile manufacturers and the automotive industry chain. The mainstream PVC leather laminated polyurethane sponge products and PU leather laminated polyurethane sponge products for automotive interiors have been criticized by more and more consumers due to their excessive odor / VOC, easy aging, yellowing and falling, and difficult cleaning and maintenance. The development of leather laminated sponge products with low odor and low VOC, not easy to age, yellow and fall, easy to clean and maintain, and cheaper than genuine leather (cowhide, sheepskin, pigskin) laminated polyurethane sponge products has become an urgent need for consumers and industry enterprises.

[0003] Silicone polymer materials (organic silicone), due to their unique molecular structure, have excellent properties such as low surface energy (not easy to adsorb or adhere to other substances, easy to clean and maintain), high and low temperature resistance, UV resistance, thermal oxygen aging resistance, flame retardant, low precipitation (low odor and low VOC) compared to carbon-based polymer materials. Since 2020, with the vigorous development of the silicone industry, silicone leather (silicone single leather + base cloth / flannel / microfiber cloth) has gradually entered the field of vision of ordinary consumers. Like other silicone polymer materials, silicone leather has the advantages of low odor / VOC, not easy to age, yellow and fall off, easy to clean and maintain, etc., and has been loved by more and more consumers. It has now appeared on the back cover packaging of 3C electronic products and the skin of high-end furniture.

[0004] With the development of the automobile industry, the mainstream leather-bonded polyurethane sponge products for automobile interiors have become more and more concerned by consumers, such as excessive odor / VOC, aging, yellowing and falling, and difficulty in cleaning and maintenance. Silicone leather materials have the advantages of low odor / VOC, not easy to age, yellow and fall, and easy to clean and maintain. Therefore, replacing the existing PVC leather and PU leather with polyurethane sponge for bonding with silicone leather to prepare silicone leather-bonded polyurethane sponge products for automobile interiors seems to be a good solution. However, silicone materials have the disadvantages of low strength, low elongation at break, poor scratch resistance, and low peeling force when bonding with other materials. How to solve the above shortcomings of silicone materials and give silicone leather-bonded polyurethane sponge products excellent physical properties and peeling force has become the key to the development of silicone leather-bonded polyurethane sponge products, a new option for leather-bonded polyurethane sponge products for automobile interiors. Summary of the invention

[0005] The purpose of the present invention is to provide a silicone leather laminated polyurethane sponge product and a preparation method thereof in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the present invention is to provide a high-quality silicone leather laminated polyurethane sponge.

[0006] In view of the defects and shortcomings of the prior art, the present invention proposes the following design ideas:

[0007] 1) When preparing the silicone skin layer, in order to improve the strength of the silicone skin layer, a vinyl MQ resin mixture is added to the A and B components. The vinyl groups of the vinyl MQ resin in the mixture react with the silyl groups of the silyl-hydrogen polysiloxane to form a cross-linked network in the molecular structure of the silicone skin layer; the unique molecular structure of the vinyl MQ resin gives the silicone skin layer excellent strength;

[0008] 2) When preparing the silicone skin layer, in order to improve the elongation at break of the silicone skin layer, a chain extender is added to the A and B components. The chain extender is bonded into the molecular structure of the silicone skin layer through the silane hydrogen groups at both ends of its molecular chain segment and the vinyl group of the vinyl polysiloxane through a silane hydrogen addition reaction. The long straight chain of the chain extender extends the length of the silicone skin layer molecular chain, increases the flexibility of the silicone skin layer molecular chain, and gives the silicone skin layer excellent elongation at break;

[0009] 3) When preparing the silicone skin layer, in order to improve the scratch resistance of the silicone skin layer, a hydrogen-containing resin (a mixture of polysiloxane containing silicon hydrogen groups and MQ resin with silicon hydrogen groups) is added to components A and B. The MQ resin with silicon hydrogen groups in the hydrogen-containing resin and the vinyl polysiloxane are bonded into the molecular structure of the silicone skin layer through a silylation reaction, and the unique molecular structure of the MQ resin with silicon hydrogen groups gives the silicone skin layer excellent strength;

[0010] 4) When the silicone leather layer and the polyurethane sponge layer are bonded together to prepare the product, in order to improve the peeling force of the product, a polyurethane sponge with a higher open porosity (higher air permeability) is selected. When the sponge and the silicone leather layer are compacted and flattened by a calender roller or a roller, the uncured liquid silicone can penetrate into the pores of the sponge. After curing, a claw anchor structure similar to an expansion screw is formed, which has the effect of improving the peeling force of the silicone leather bonded to the polyurethane sponge product.

[0011] Based on the above technical ideas, the present invention provides a silicone leather laminated polyurethane sponge product and a preparation method thereof. Based on the characteristics of silicone leather, the silicone leather laminated polyurethane sponge product prepared by the present invention is very suitable for use as automobile interior.

[0012] One object of the present invention is to provide a silicone leather laminated polyurethane sponge product having the following characteristics:

[0013] 1) It has the characteristics of low odor and low VOC, which can effectively meet consumers' demand for odor comfort of automotive interior materials;

[0014] 2) The silicone leather layer has a delicate and comfortable touch, is scratch-resistant, and has the characteristics of high and low temperature resistance, UV resistance, and thermal oxygen aging resistance. The leather layer will not age, turn yellow, or fall off after long-term use;

[0015] 3) It is easy to clean and maintain. Common dirt in life, such as oil stains, oily pen marks, cosmetics, etc., can be wiped clean with a wet towel;

[0016] Another object of the present invention is to provide a method for preparing a silicone leather laminated polyurethane sponge product.

[0017] According to one solution of the present invention, a silicone leather-bonded polyurethane sponge product is provided, and the product includes four layers, namely, a release film layer, a hand-feel layer, a silicone skin layer, and a polyurethane sponge layer from top to bottom. Among them, the release film layer is a PET silicone release film with a thickness of 25 to 75um and a release force of 5 to 20gf / inch; the hand-feel layer includes three components: a surface treatment agent, a catalyst, and a diluent; the silicone skin layer has a thickness of 0.1 to 0.3mm and includes two components A and B; the polyurethane sponge is a polyester sponge or a polyether sponge with a thickness of 2 to 10mm and an air permeability of 150L / m2 / s to 1500L / m2 / s. The silicone leather-bonded polyurethane sponge product has the advantages of delicate and comfortable touch, scratch resistance, low odor, low VOC, no aging, yellowing, and falling off after long-term use, and easy maintenance and cleaning, which can meet the performance requirements of consumers for leather-bonded sponge products for automotive interiors.

[0018] Furthermore, in the silicone leather laminated polyurethane sponge product, the tensile strength of the silicone leather layer is 500KPa to 1200KPa, and the elongation at break is 100% to 400%; in the silicone leather layer, the mixing mass ratio of component A to component B when used is 1:1.

[0019] Furthermore, in the silicone leather laminated polyurethane sponge product, the surface treatment agent, catalyst and diluent are all commercially available products. When used, the mass ratio of the surface treatment agent, diluent and catalyst is 1:0.7-1.2:0.02-0.03.

[0020] Furthermore, in the silicone leather layer of the silicone leather-laminated polyurethane sponge product, component A includes vinyl polysiloxane, base glue, vinyl MQ resin mixture, crosslinking agent, chain extender, hydrogen-containing resin, catalyst, and inhibitor; component B includes vinyl polysiloxane, base glue, vinyl MQ resin mixture, crosslinking agent, chain extender, and hydrogen-containing resin.

[0021] Furthermore, in the components A and B of the silicone skin layer, the vinyl polysiloxane includes one or more of a double-terminal vinyl polysiloxane, a double-terminal side-chain vinyl polysiloxane, and a double-terminal methyl side-chain vinyl polysiloxane, preferably a double-terminal vinyl polysiloxane; in the components A and B, the crosslinking agent includes one or more of a polysiloxane containing a silicon hydrogen group in the side chain and a polysiloxane containing a silicon hydrogen group in the double terminal, preferably a polysiloxane containing a silicon hydrogen group in the side chain;

[0022] Furthermore, in the A and B components of the silicone skin layer, the viscosity of the vinyl polysiloxane is 10000mPa·S / 25℃~165000mPa·S / 25℃, the silane content of the crosslinking agent (silane-containing polysiloxane) is 5mmol / g~16mmol / g, and the base glue is a commercially available product with a viscosity of 750000mPa·S / 25℃~1200000mPa·S / 25℃.

[0023] Furthermore, in the A and B components of the silicone skin layer, the vinyl MQ resin mixture is a mixture of vinyl polysiloxane and MQ resin with vinyl groups; in the A and B components, the hydrogen-containing resin is a mixture of polysiloxane containing silicon hydrogen groups and MQ resin with silicon hydrogen groups;

[0024] Furthermore, in component A of the silica gel cortex, the catalyst is one or more of a simple substance, an inorganic compound, and an organic complex of a Group VIII metal; preferably, the catalyst is one or more of a simple substance, an inorganic compound, and an organic complex of metal platinum; more preferably, the catalyst is an organic complex of metal platinum; most preferably, the catalyst is platinum (0)-1,3-diethene-1,1,3,3-tetramethyldisiloxane, i.e., Custer's reagent; and the inhibitor is an alkynyl alcohol.

[0025] Furthermore, in the A and B components of the silicone skin layer, the addition ratio of vinyl polysiloxane, base rubber, vinyl MQ resin mixture, crosslinking agent, chain extender, hydrogen-containing resin, catalyst, and inhibitor is: 30-44: 21-26: 12-16: 0.8-1.7: 19-34: 0.25-1.05: 0.45-0.55: 0.045-0.055 by mass; preferably, the addition ratio is For example: 33-41: 22-25: 12-15: 1.0-1.5: 23-30: 0.50-0.75: 0.48-0.52: 0.048-0.052; the most preferred addition ratio is: 36-38: 23-24: 13.5-14: 1.20-1.35: 26-27: 0.6-0.65: 0.49-0.50: 0.049-0.050;

[0026] According to another aspect of the present invention, there is provided a method for preparing a silicone leather laminated polyurethane sponge product, comprising the following steps:

[0027] 1) Preparation of the hand-feel layer

[0028] The surface treatment agent, diluent and catalyst are weighed in proportion and stirred and dispersed at a speed of 1000RPM for 1 minute using a high-speed disperser to obtain a hand-feeling oil; subsequently, the hand-feeling oil is coated on the release film according to the designed thickness using an automatic coating machine or a manual coating machine, and is placed in a blast drying oven at 130°C to 150°C for heating and curing for 3 minutes to obtain a hand-feeling layer with a release film;

[0029] 2) Preparation of silicone skin

[0030] Mix them in proportion and use a high-speed mixer to stir and disperse them at a speed of 1000RPM for 3 minutes to obtain the A and B components of the silicone skin layer. Then weigh the A and B components in a 1:1 ratio and stir and disperse them at a speed of 500RPM for 2 minutes to obtain the liquid silicone for the silicone skin layer. Then use an automatic coating machine or a manual coating machine to coat the liquid silicone on the hand-feel layer with the release film according to the designed thickness. Finally, put it in a blast drying oven at 130℃~150℃ for heating and curing for 2 minutes to obtain the silicone skin layer with the release film and the hand-feel layer. From top to bottom, they are the silicone skin layer, the hand-feel layer, and the release film.

[0031] 3) Lamination of polyurethane sponge layer

[0032] Apply the prepared mixed silicone skin layer on the silicone skin layer with liquid silicone using an automatic coating machine or a manual coating machine according to the designed thickness, then lay the prepared polyurethane sponge sheet flat on the liquid silicone, and compact and flatten it with a calendering roll or roller, and finally put the obtained composite sheet into a blast drying oven at 130℃~150℃ for heating and curing for 3 minutes, and you will get a silicone skin layer with a release film and a polyurethane sponge product. From top to bottom, they are sponge layer, silicone skin layer, hand-feel layer, and release film (protective film) layer. When using, just lift off the release film;

[0033] 4) Leather layer embossing and protective film coating

[0034] The release film of the silicone leather laminated polyurethane sponge product with a release film prepared in step 3 is removed, and then the silicone leather laminated polyurethane sponge product is pressed by an embossing machine to produce the desired leather texture, thus obtaining the desired silicone leather laminated polyurethane sponge product. Subsequently, the release film used in step 1) is applied to the upper part of the leather layer, thus obtaining the silicone leather laminated polyurethane sponge product with a protective film, and the protective film can be removed when in use.

[0035] According to the present invention, a silicone leather-laminated polyurethane sponge product and a preparation method thereof are provided. Using the preparation method provided by the present invention, the prepared silicone leather-laminated polyurethane sponge product has the characteristics of low odor and low VOC, which effectively solves the problem of excessive odor / VOC of existing PVC leather-laminated polyurethane sponge and PU leather-laminated polyurethane sponge products; at the same time, the prepared silicone leather-laminated polyurethane sponge product has the characteristics of not aging, yellowing or falling off after long-term use, and has the advantages of easy maintenance and cleaning, etc., which can meet the performance requirements of consumers for leather-laminated sponge products for automotive interiors, and is very suitable for use as leather-laminated polyurethane sponge products for automotive interiors. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the multi-layer structure of silicone leather laminated with polyurethane sponge products. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0038] like Figure 1 As shown in the figure, the silicone leather laminated polyurethane sponge product includes four layers, namely, release film layer, hand-feel layer, silicone skin layer, and polyurethane sponge layer from top to bottom. Among them, the release film layer is a PET silicone release film with a thickness of 25-75um; the hand-feel layer includes three components: surface treatment agent, catalyst, and diluent; the silicone skin layer is 0.1-0.3mm thick and includes two components A and B; the polyurethane sponge is a polyester sponge or a polyether sponge with a thickness of 2-10mm.

[0039] The following are specific embodiments:

[0040] All basic raw materials used in the following examples are commercially available products.

[0041] Example 1

[0042] The preparation of silicone leather laminated polyurethane sponge products includes the following steps:

[0043] 1) Preparation of the hand-feel layer

[0044] The surface treatment agent, diluent and catalyst are weighed in a ratio of 1:1:0.02 and are stirred and dispersed at a speed of 1000RPM for 1 minute using a high-speed disperser to obtain a hand-feeling oil; subsequently, the hand-feeling oil is coated on a 10gf / inch to 15gf / inch PET release film with a thickness of 50um using an automatic coating machine or a manual coating machine according to a designed thickness, and is placed in a blast drying oven at 130°C to 150°C for heating and curing for 3 minutes to obtain a hand-feeling layer with a release film;

[0045] 2) Preparation of silicone skin

[0046] According to the ratio of 36:23:13.5:1.25:26:0.6:0.49:0049, weigh out the following components: vinyl polysiloxane with a viscosity of 150,000 mPa·S / 25°C (204-150,000 produced by Jiande Polymer New Materials Co., Ltd.), base glue with a viscosity of 750,000 mPa·S / 25°C (6345 base glue produced by Dongguan Chuanshi Electronic Technology Co., Ltd.), vinyl MQ resin mixture (VQM6 produced by Anbi Ya Special Silicone (Nantong) Co., Ltd.), cross-linking agent with a hydrogen content of 16 mmol / g (side chain hydrogen-containing silicone oil H=1.6 produced by Jiande Polymer New Materials Co., Ltd.), chain extender (CE30 produced by Anbi Ya Special Silicone (Nantong) Co., Ltd.), hydrogen-containing resin (MQH9 produced by Anbi Ya Special Silicone (Nantong) Co., Ltd.), catalyst (PT -5000), inhibitor (OS121 of Shenzhen Ousibang New Materials Co., Ltd.); weigh the vinyl polysiloxane with a viscosity of 165000mPa·S / 25℃ (204-150000 of Jiande Polymer New Materials Co., Ltd.), base glue with a viscosity of 750000mPa·S / 25℃ (6345 base glue of Dongguan Chuanshi Electronic Technology Co., Ltd.), vinyl MQ resin mixture (VQM6 of Anbi Ya Special Silicone (Nantong) Co., Ltd.), cross-linking agent with a hydrogen content of 16mmol / g (H16 of Jiangxi Lanxing Xinghuo Silicone Co., Ltd.), chain extender (CE30 of Anbi Ya Special Silicone (Nantong) Co., Ltd.), and hydrogen-containing resin (MQH9 of Anbi Ya Special Silicone (Nantong) Co., Ltd.) in the B component according to the ratio of 36:23:13.5:1.25:26:0.6. Then stir and disperse with a mixer at a speed of 1000RPM for 3min to obtain the A and B components of the silica gel skin layer. Subsequently, the A and B components are weighed in a 1:1 ratio and stirred and dispersed at a speed of 500RPM for 2 minutes to obtain liquid silicone for the silicone skin layer, and then the liquid silicone is coated on the hand-feel layer with the release film by an automatic coating machine or a manual coating machine at a designed thickness of 0.2mm, and finally placed in a blast drying oven at 130℃~150℃ for heating and curing for 2 minutes to obtain a silicone skin layer with a release film and a hand-feel layer, which are silicone skin layer, hand-feel layer, and release film from top to bottom;

[0047] 3) Lamination of polyurethane sponge layer

[0048] The silicone skin layer prepared and mixed in step 2) is coated on the silicone skin layer with liquid silicone using an automatic coating machine or a manual coating machine at a designed thickness of 25um, and then the prepared 4mm thick 350L / m2 / s air permeability polyurethane sponge sheet is laid flat on the liquid silicone, and compacted and flattened with a calendering roll or a roller, and finally the obtained composite sheet is placed in a blast drying oven at 130℃~150℃ for heating and curing for 3min, so as to obtain a silicone skin layer laminated polyurethane sponge product with a release film. From top to bottom, they are sponge layer, silicone skin layer, hand-feel layer, and release film (protective film) layer. When using, just lift off the release film.

[0049] 4) Leather layer embossing and protective film coating

[0050] The release film of the silicone leather laminated polyurethane sponge product with a release film prepared in step 3 is removed, and then the silicone leather laminated polyurethane sponge product is pressed by an embossing machine to produce the desired leather texture, thus obtaining the desired silicone leather laminated polyurethane sponge product. Subsequently, the release film used in step 1) is applied to the upper part of the leather layer, thus obtaining the silicone leather laminated polyurethane sponge product with a protective film, and the protective film can be removed when in use.

[0051] Example 2

[0052] The difference between Example 2 and Example 1 is that in step 2) in the preparation of the silicone skin layer, the viscosity of the vinyl polysiloxane used in components A and B is 65000 mPa·S / 25°C (204-50000 from Jiande Polymer New Materials Co., Ltd.), and the rest is consistent with Example 1.

[0053] Example 3

[0054] The difference between Example 3 and Example 1 is that in step 2) in the preparation of the silicone skin layer, the viscosity of the vinyl polysiloxane used in components A and B is 20000 mPa·S / 25°C (204-20000 from Jiande Polymer New Materials Co., Ltd.), and the rest is consistent with Example 1.

[0055] Example 4

[0056] The difference between Example 4 and Example 1 is that in step 2) in the preparation of the silicone skin layer, the viscosity of the vinyl polysiloxane used in components A and B is 10000 mPa·S / 25°C (204-10000 from Jiande Polymer New Materials Co., Ltd.), and the rest is consistent with Example 1.

[0057] Example 5

[0058] The difference between Example 5 and Example 1 is that, in step 2) in the preparation of the silicone skin layer, the viscosity of the vinyl polysiloxane used in components A and B is 65000 mPa·S / 25°C (204-50000 of Jiande Polymer New Materials Co., Ltd.), the hydrogen content of the cross-linking agent is 10 mmol / g (side chain hydrogen-containing silicone oil H=1.0 of Jiande Polymer New Materials Co., Ltd.), and the rest is consistent with Example 1.

[0059] Example 6

[0060] The difference between Example 6 and Example 1 is that, in step 2) in the preparation of the silicone skin layer, the viscosity of the vinyl polysiloxane used in components A and B is 65000 mPa·S / 25°C (204-50000 of Jiande Polymer New Materials Co., Ltd.), the hydrogen content of the cross-linking agent is 5 mmol / g (side chain hydrogen-containing silicone oil H=0.5 of Jiande Polymer New Materials Co., Ltd.), and the rest is consistent with Example 1.

[0061] Comparative Example 1

[0062] The leather-laminated polyurethane sponge product of Comparative Example 1 is obtained by laminating the same polyurethane sponge as that of Examples 1 to 6 with commercially available PVC leather by means of polyurethane hot melt adhesive.

[0063] Comparative Example 2

[0064] The leather-laminated polyurethane sponge product of Comparative Example 2 is obtained by laminating the same polyurethane sponge as that of Examples 1 to 6 with commercially available PU single leather by means of polyurethane hot melt adhesive.

[0065] The physical property test results of the leather-conforming polyurethane sponge products prepared in Examples 1 to 6 and Comparative Examples 1 and 2 are shown in Table 1.

[0066] Table 1 Physical property test results of leather laminated polyurethane sponge products

[0067]

[0068]

[0069] It can be seen from Table 1 that in the comparison of single leather (single leather layer) without base cloth and no bonding operation, the tensile strength of the silicone leather prepared by Examples 1 to 4 in Implementation 1 to 6 is not worse than the tensile strength of the existing PVC leather and PU leather single leather; and from the perspective of elongation at break, except for the relatively poor silicone leather single leather prepared by Implementation 4, the tensile strength of the silicone leather single leather prepared by the other embodiments is better than that of PVC; among them, the silicone leather single leather prepared by Examples 1 and 2 has the best comprehensive mechanical properties, and the tensile strength and elongation at break are better than those of PVC leather and PU leather single leather.

[0070] From the odor level test items in Table 1, the odor levels of the silicone leather laminated polyurethane sponge products prepared in Examples 1 to 6 are lower than those of the existing PVC leather laminated polyurethane sponge and PU leather laminated polyurethane sponge products, which is mainly due to the low emission of silicone leather and the odorless nature of the raw materials for preparing silicone leather. From the thermal oxygen aging test items in Table 1, the silicone leather laminated polyurethane sponge products prepared in Examples 1 to 6 did not show yellowing and shedding of the leather layer; in contrast, the existing PVC leather laminated polyurethane sponge and PU leather laminated polyurethane sponge products showed yellowing and shedding of the leather layer, which is mainly because the silicone material has excellent resistance to high and low temperatures and thermal oxygen aging. From the cleaning and maintenance ease test items in Table 1, the leather layer of the silicone leather laminated polyurethane sponge products prepared in Examples 1 to 6 is easy to clean and maintain, while the existing PVC leather laminated polyurethane sponge and PU leather laminated polyurethane sponge products are difficult to clean and maintain, and require extreme caution during normal use; this is mainly because silicone leather has extremely low surface energy, and its surface is not easy to adhere to or adhere to other substances, so it is easy to clean and maintain.

[0071] From the scratch resistance test items in Table 1, the scratch resistance of the leather layer of the silicone leather laminated polyurethane sponge products prepared by implementing 1, 2, 3, 5, and 6 is not worse than that of the leather layer of the existing PVC leather laminated polyurethane sponge and PU leather laminated polyurethane sponge products; this is mainly because the scratch resistance of the silicone leather is improved by adding hydrogen-containing resin when configuring the liquid organic silicone material for silicone leather. From the touch test items in Table 1, the touch of the leather layer of the silicone leather laminated polyurethane sponge products prepared by implementing 1 to 6 is better than that of the leather layer of the existing PVC leather laminated polyurethane sponge and PU leather laminated polyurethane sponge products.

[0072] In summary, the silicone leather-laminated polyurethane sponge product prepared by the preparation method provided by the present invention has the advantages of low odor, not easy to age, yellow, and fall off, easy to clean and maintain, and delicate touch, compared with the existing PVC leather-laminated polyurethane sponge and PU leather-laminated polyurethane sponge products. It is very suitable as a new option for leather-laminated polyurethane sponge products for automotive interiors, and can replace genuine leather-laminated polyurethane sponge products to a certain extent.

[0073] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A silicone leather laminated polyurethane sponge product, characterized in that: The silicone leather laminated polyurethane sponge product comprises three layers, namely, a release film layer, a hand-feel layer, a silicone skin layer, and a polyurethane sponge layer from top to bottom; wherein the release film layer is a PET silicone release film with a thickness of 25 to 75 um and a release force of 5 to 20 gf / inch; the hand-feel layer is a mixture of three components including a surface treatment agent, a catalyst, and a diluent; the silicone skin layer has a thickness of 0.1 to 0.3 mm; the polyurethane sponge is a polyester sponge or a polyether sponge with a thickness of 2 to 10 mm and an air permeability of 150 L / m2 / s to 1500 L / m2 / s; The tensile strength of the silicone skin is 500KPa to 1200KPa, and the elongation at break is 100% to 400%; The surface treatment agent, catalyst and diluent are all commercially available products. When used, the ratio of the surface treatment agent, the diluent and the catalyst is 1:0.7-1.2:0.02-0.

03.

2. A silicone leather laminated polyurethane sponge product according to claim 1, characterized in that: The silicone skin layer includes two components, A and B. The mixing ratio of component A to component B is 1:

1. Component A includes vinyl polysiloxane, base glue, vinyl MQ resin mixture, crosslinking agent, chain extender, hydrogen-containing resin, catalyst, and inhibitor; component B includes vinyl polysiloxane, base glue, vinyl MQ resin mixture, crosslinking agent, chain extender, and hydrogen-containing resin.

3. A silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In components A and B, the vinyl polysiloxane includes one or more of a double-terminal vinyl polysiloxane, a double-terminal side-chain vinyl polysiloxane, and a double-terminal methyl side-chain vinyl polysiloxane, preferably a double-terminal vinyl polysiloxane; in components A and B, the crosslinking agent includes one or more of a polysiloxane containing silicon hydrogen groups in the side chain and a polysiloxane containing silicon hydrogen groups in the double terminal, preferably a polysiloxane containing silicon hydrogen groups in the side chain.

4. The silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In components A and B, the viscosity of vinyl polysiloxane is 10000mPa·S / 25℃~165000mPa·S / 25℃, the cross-linking agent is a cross-linking agent of silicon hydrogen-containing polysiloxane, the silicon hydrogen content in the cross-linking agent is 5mmol / g~16mmol / g, and the base glue is a commercially available product with a viscosity of 750000mPa·S / 25℃~1200000mPa·S / 25℃.

5. The silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In components A and B, the vinyl MQ resin mixture is a mixture of vinyl polysiloxane and MQ resin with vinyl groups; in components A and B, the hydrogen-containing resin is a mixture of polysiloxane containing silicon hydrogen groups and MQ resin with silicon hydrogen groups.

6. The silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In component A, the catalyst is one or more of a simple substance, an inorganic compound, and an organic complex of a metal of Group VIII; and the inhibitor is an alkynyl alcohol.

7. The silicone leather laminated polyurethane sponge product according to claim 6, characterized in that: The catalyst is platinum (0)-1,3-diethene-1,1,3,3-tetramethyldisiloxane, also known as Custer's reagent.

8. The silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In components A and B, the addition ratio of vinyl polysiloxane, base rubber, vinyl MQ resin mixture, crosslinking agent, chain extender, hydrogen-containing resin, catalyst and inhibitor is: 30-44: 21-26: 12-16: 0.8-1.7: 19-34: 0.25-1.05: 0.45-0.55: 0.045-0.

055.

9. The silicone leather laminated polyurethane sponge product according to claim 4, characterized in that: In components A and B, the addition ratio of vinyl polysiloxane, base rubber, vinyl MQ resin mixture, crosslinking agent, chain extender, hydrogen-containing resin, catalyst and inhibitor is: 36-38: 23-24: 13.5-14: 1.20-1.35: 26-27: 0.6-0.65: 0.49-0.50: 0.049-0.

050.

10. The method for preparing a silicone leather laminated polyurethane sponge product according to claims 1 to 9, characterized in that: The following steps are involved: 1) Preparation of the hand-feel layer The surface treatment agent, diluent and catalyst are weighed in proportion and stirred and dispersed at a speed of 1000RPM for 1 minute using a high-speed disperser to obtain a hand-feeling oil; subsequently, the hand-feeling oil is coated on the release film according to the designed thickness using an automatic coating machine or a manual coating machine, and is placed in a blast drying oven at 130°C to 150°C for heating and curing for 3 minutes to obtain a hand-feeling layer with a release film; 2) Preparation of silicone skin The A and B components of the silicone skin layer are prepared in proportion and stirred and dispersed at a speed of 1000RPM for 3 minutes with a high-speed stirrer; then the A and B components are weighed in a 1:1 ratio and stirred and dispersed at a speed of 500RPM for 2 minutes to obtain liquid silicone for the silicone skin layer, and then the liquid silicone is coated on the hand feeling layer with the release film with an automatic coating machine or a manual coating machine according to the designed thickness, and finally placed in a blast drying oven at 130℃ to 150℃ for heating and curing for 2 minutes, so as to obtain a silicone skin layer with a release film and a hand feeling layer, which are silicone skin layer, hand feeling layer, and release film from top to bottom; 3) Lamination of polyurethane sponge layer The prepared mixed silicone skin layer is coated on the silicone skin layer with liquid silicone using an automatic coating machine or a manual coating machine according to the designed thickness, and then the prepared polyurethane sponge sheet is laid flat on the liquid silicone, and compacted and flattened with a calendering roll or a roller, and finally the obtained composite sheet is placed in a blast drying oven at 130°C to 150°C for heating and curing for 3 minutes, so as to obtain a silicone skin layer with a release film bonded to a polyurethane sponge product; from top to bottom, they are sponge layer, silicone skin layer, hand-feel layer, and release film (protective film) layer; 4) Leather layer embossing and protective film coating The release film of the silicone leather laminated polyurethane sponge product with a release film prepared in step 3 is peeled off, and then the silicone leather laminated polyurethane sponge product is pressed into the desired leather texture by an embossing machine to obtain the desired silicone leather laminated polyurethane sponge product; then the release film used in step 1) is covered on the upper part of the leather layer to obtain the silicone leather laminated polyurethane sponge product with a protective film, and the protective film can be peeled off when in use.

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