CN115157818B - Anti-fouling and anti-graffiti semi-silicon synthetic leather and manufacturing process thereof - Google Patents

Abstract

The application relates to the technical field of synthetic leather, and particularly discloses an anti-fouling and anti-doodling semi-silicon synthetic leather and a manufacturing process thereof. The anti-fouling and anti-graffiti semi-silicon synthetic leather comprises a base cloth layer, a polymer layer and an organic silicon film layer, wherein the base cloth layer, the polymer layer and the organic silicon film layer are sequentially attached to each other in the thickness direction, the polymer layer is a polyurethane layer or a polyvinyl chloride layer, the organic silicon film layer is obtained by baking and curing organic silicon slurry, and the organic silicon slurry comprises the following components in parts by weight: 2-4 parts of cyclohexanone, 14-18 parts of filler, 8-12 parts of silane coupling agent, 8-12 parts of hydroxyl silicone oil, 6-10 parts of thickening slurry and 18-22 parts of water. In the organic silicon film layer, the polymer chain segments of the polymer dissolution area and the organic silicon chain segments in the organic silicon cross-linked body are mutually wound, so that the combination degree between the organic silicon film layer and the polymer layer is increased, the peeling of the organic silicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Description

Anti-fouling and anti-graffiti semi-silicon synthetic leather and manufacturing process thereof

Technical Field

The application relates to the technical field of synthetic leather, in particular to an anti-fouling and anti-graffiti semi-silicon synthetic leather and a manufacturing process thereof.

Background

Synthetic leather is an industrial product used to replace natural leather, and has wide application in daily life and industrial production. The semi-silicon synthetic leather is a product obtained by further processing polyurethane synthetic leather or PVC synthetic leather. The semi-silicon synthetic leather is different from polyurethane synthetic leather and PVC synthetic leather in that the surface of the semi-silicon synthetic leather is covered with an organic silicon coating, the organic silicon coating improves the hydrophobicity of the surface of the synthetic leather, and the waterproof and antifouling effects of the synthetic leather are improved.

In the related art, a semi-silicon synthetic leather comprises a base cloth layer, a polymer layer and an organic silicon film layer which are sequentially laminated, wherein the polymer layer is a polyurethane layer or a polyvinyl chloride layer, the organic silicon film layer is obtained by baking and solidifying organic silicon slurry, and the organic silicon slurry comprises the following components in parts by weight: 16 parts of filler, 10 parts of silane coupling agent, 10 parts of hydroxyl silicone oil and 20 parts of water. The preparation method of the semi-silicon synthetic leather comprises the following steps: cutting PU calendered cloth to obtain a polymer layer; (2) Spreading an adhesive on the surface of the polymer layer, attaching a base cloth layer on the surface of the polymer layer, and drying and curing for 30min by using hot air at 150 ℃ to obtain a polymer layer bonded with the base cloth layer; in the step, the adhesive is single-component polyurethane glue; (3) And (3) scraping and coating the organosilicon slurry on one side of the polymer layer, which is away from the base cloth layer, baking and curing for 15min by using hot air at 120 ℃, and rolling to obtain the antifouling and anti-graffiti semi-silicon synthetic leather.

In view of the above-mentioned related art, the inventors believe that although the anti-fouling performance of the synthetic leather is improved by forming the silicone film layer on the surface of the polymer layer using the silane coupling agent and the hydroxyl silicone oil in the related art, when the surface of the synthetic leather is rubbed for a long period of time, the bonding force between the polymer layer and the silicone segment is weak, and thus the silicone film layer is easily peeled off, affecting the durability of the anti-fouling performance of the synthetic leather.

Disclosure of Invention

In the related art, when the surface of the synthetic leather is rubbed for a long time, the organosilicon film layer is easy to peel off, and the durability of the antifouling performance of the synthetic leather is affected. In order to overcome the defect, the application provides an anti-fouling and anti-graffiti semi-silicon synthetic leather and a manufacturing process thereof.

In a first aspect, the application provides an antifouling and anti-graffiti semi-silicon synthetic leather, which adopts the following technical scheme:

the utility model provides a semi-silicon synthetic leather of anti-fouling and anti-doodling, includes base cloth layer, polymer layer and the organosilicon rete that follow thickness direction laminating in proper order and set up, the polymer layer is polyurethane layer or polyvinyl chloride layer, the organosilicon rete is obtained by the organosilicon ground paste after curing through toasting, the organosilicon ground paste includes following component by weight: 2-4 parts of cyclohexanone, 14-18 parts of filler, 8-12 parts of silane coupling agent, 8-12 parts of hydroxyl silicone oil, 6-10 parts of thickening slurry and 18-22 parts of water, wherein the thickening slurry is a copolymer obtained by polymerizing cyclohexanone, melamine and formaldehyde under the condition of excessive formaldehyde.

By adopting the technical scheme, after the organosilicon slurry is contacted with the polymer layer, cyclohexanone can dissolve the surface of the polymer layer, so that polymer chain segments on the surface of the polymer layer are disentangled. Then, the silane coupling agent and the hydroxyl silicone oil are combined on the surface of the polymer layer to form an organosilicon cross-linked body. After baking and curing, the organosilicon crosslinked body, the filler and the thickening slurry are cured together to form an organosilicon film layer. In the semi-silicon synthetic leather disclosed by the application, the thickening slurry increases the density of the organic silicon film layer, and the organic silicon chain segments and the polymer chain segments which are disentangled on the surface of the polymer layer are mutually entangled, so that the bonding degree between the organic silicon film layer and the polymer layer is increased, the peeling of the organic silicon film layer is finally reduced, and the durability of the antifouling property of the synthetic leather is improved.

In addition, free cyclohexanone in the organosilicon slurry and residual formaldehyde in the thickened slurry undergo polyaddition reaction in the baking and curing process, so that free cyclohexanone and formaldehyde are consumed, the dissolution effect of cyclohexanone on the polymer layer is weakened, and the curing of the organosilicon slurry is promoted.

Preferably, the organic silicon slurry comprises the following components in parts by weight: 2.5-3.5 parts of cyclohexanone, 15-17 parts of filler, 9-11 parts of silane coupling agent, 9-11 parts of hydroxyl silicone oil, 7-9 parts of thickening slurry and 19-21 parts of water.

By adopting the technical scheme, the proportion of the organic silicon slurry is optimized, the peeling of an organic silicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Preferably, the thickening slurry is obtained by heating and vacuum drying a raw material liquid, wherein the raw material liquid comprises the following components in parts by weight: 6-8 parts of formaldehyde, 12-16 parts of cyclohexanone, 0.2-0.4 part of melamine, 8-12 parts of water, 2-4 parts of adsorbent and 1-2 parts of catalyst.

By adopting the technical scheme, the catalyst is used for catalyzing the polymerization of formaldehyde, cyclohexanone and melamine under the condition that the catalyst and the adsorbent exist simultaneously. The adsorbent can increase the concentration of the formaldehyde, cyclohexanone and melamine in local areas around the adsorbent, and simultaneously the adsorption can reduce the activation energy of the formaldehyde, cyclohexanone and melamine, thereby improving the rate of polymerization reaction and accelerating the generation of thickened slurry.

Preferably, the catalyst is at least one of sodium hydroxide and silicate cement.

By adopting the technical scheme, hydroxide ions can be generated in water by sodium hydroxide and silicate cement, so that polymerization of formaldehyde, cyclohexanone and melamine is catalyzed. When the catalyst comprises silicate cement, the silicate cement can be converted into silicate gel in the raw material liquid, and the silicate gel can provide attachment sites for organosilicon crosslinking bodies in the organosilicon slurry and is cured together with the organosilicon crosslinking bodies, so that the compactness of the organosilicon film layer is improved, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Preferably, the adsorbent is slag powder.

By adopting the technical scheme, the sodium hydroxide and the silicate cement can excite the hydration activity of the slag powder, when the catalyst comprises the silicate cement, the residual slag powder in the thickened slurry can be combined with silicate gel formed after the silicate cement is hydrated on one hand, and the pore structure of the slag powder can adsorb the organosilicon crosslinking body on the other hand, so that the combination between the silicate gel and the organosilicon crosslinking body is promoted, the compactness of an organosilicon film layer is improved, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Preferably, the thickened slurry is prepared as follows:

(1) Uniformly mixing a catalyst, an adsorbent, formaldehyde, cyclohexanone, melamine and water to obtain a raw material liquid;

(2) Heating the raw material liquid for 2-4 hours under the water bath condition of 90-95 ℃ to obtain a prepolymerization liquid;

(3) And continuously heating the prepolymer liquid for 1-2h by using a boiling water bath, and then carrying out vacuum drying to obtain thickened slurry.

By adopting the technical scheme, the method of the application ensures that formaldehyde, cyclohexanone and melamine react with each other in a polymerization way under the condition of heating in water bath by the participation of the adsorbent and the catalyst, and finally the thickened slurry is obtained.

Preferably, the polymer layer is a polyvinyl chloride layer, and the filler is prepared according to the following method:

(1) Uniformly mixing an inorganic carrier, sodium persulfate and water, and removing water through vacuum drying to obtain an oxidant carrier;

(2) Uniformly mixing an oxidant carrier, acetone and a film forming agent, heating until the film forming agent is completely dissolved in the acetone, cooling the mixture, filtering and vacuum drying after precipitation is generated in a liquid phase, and obtaining the filler.

By adopting the technical scheme, the inorganic carrier is firstly used for absorbing sodium persulfate, and then the filler is obtained after the sodium persulfate is wrapped by the film forming agent. In the process of baking and solidifying the organosilicon slurry, the concentration of hydroxide ions in the organosilicon slurry increases with the evaporation of water. Under the combined action of the rising of hydroxide ion concentration and baking and heating, part of chain segments in the polyvinyl chloride layer can remove hydrogen chloride to generate double bonds, at the moment, the film forming agent on the surface of the filler is heated and melted, and the oxidizer carrier is released, and sodium persulfate dissolved in the oxidizer carrier oxidizes newly generated double bonds in the polyvinyl chloride chain segments into hydroxyl groups, carboxyl groups and other groups, so that the affinity of the polyvinyl chloride layer to the silane coupling agent is enhanced, the bonding degree between the organosilicon film layer and the polymer layer is increased, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Preferably, the inorganic carrier is diatomite.

By adopting the technical scheme, the diatomite has better affinity with the water phase and the organic phase, can be used as a carrier of sodium persulfate, is easy to combine with a film forming agent, and reduces the processing difficulty of the filler. When the organic silicon slurry is solidified, the diatomite is combined with silicate gel in the organic silicon film layer, so that the compactness of the organic silicon film layer is improved, the peeling of the organic silicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

Preferably, the film forming agent is stearic acid.

By adopting the technical scheme, stearic acid can be attached to the surface of the polyvinyl chloride layer after being melted in the process of baking and solidifying the organosilicon slurry, so that the affinity between the polyvinyl chloride layer and the water phase is enhanced, and the contact and oxidization of sodium persulfate and the polyvinyl chloride layer are facilitated.

In a second aspect, the application provides a manufacturing process of an anti-fouling and anti-graffiti semi-silicon synthetic leather, which adopts the following technical scheme.

A manufacturing process of an anti-fouling and anti-graffiti semi-silicon synthetic leather comprises the following steps:

(1) Cutting PU rolled cloth or PVC rolled cloth to obtain a polymer layer;

(2) Spreading an adhesive on the surface of the polymer layer, attaching a base cloth layer on the surface of the polymer layer, and drying and curing to obtain a polymer layer bonded with the base cloth layer;

(3) And scraping and coating any one of the organic silicon slurry on one side of the polymer layer, which is away from the base cloth layer, and baking, solidifying and rolling to obtain the anti-fouling and anti-graffiti semi-silicon synthetic leather.

By adopting the technical scheme, the method comprises the steps of firstly bonding the base cloth layer and the polymer layer, then brushing the surface of the polymer layer with the organic silicon slurry, fully combining and curing the organic silicon components in the organic silicon slurry and the polymer layer through baking, and obtaining the anti-fouling and anti-graffiti semi-silicon synthetic leather after rolling.

In summary, the application has the following beneficial effects:

1. the application utilizes cyclohexanone in the organosilicon slurry to dissolve the polymer layer, so that a polymer dissolution area is generated on the surface of the polymer layer, and simultaneously, the silane coupling agent and the hydroxyl silicone oil are combined to form an organosilicon cross-linked body, and then the organosilicon cross-linked body is baked and solidified to obtain the organosilicon film layer. In the organic silicon film layer, the polymer chain segments of the polymer dissolution zone are intertwined with the organic silicon chain segments in the organic silicon cross-linked body, so that the bonding degree between the organic silicon film layer and the polymer layer is increased, the peeling of the organic silicon film layer is reduced, and the durability of the antifouling property of the synthetic leather is improved.

2. The catalyst preferably used in the preparation of the thickening slurry is at least one of sodium hydroxide and silicate cement, and when the catalyst comprises silicate cement, silicate gel produced by the reaction of silicate cement and water can provide binding sites for an organosilicon crosslinking body and can be cured together with the organosilicon crosslinking body, so that the compactness of an organosilicon film layer is improved, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

3. According to the method, the base cloth layer is bonded with the polymer layer, then the surface of the polymer layer is coated with the organic silicon slurry, the organic silicon components in the organic silicon slurry are fully combined with the polymer layer and solidified through baking, and the anti-fouling and anti-doodling semi-silicon synthetic leather is obtained after rolling.

Detailed Description

The present application will be described in further detail with reference to examples, preparations and comparative examples, and the raw materials according to the present application are all commercially available.

Preparation example of thickened slurry

The following is an example of preparation 1.

Preparation example 1

In the preparation example, the thickening slurry is obtained by heating and vacuum drying raw material liquid, and the raw material liquid comprises the following components: 6kg of formaldehyde, 12kg of cyclohexanone, 0.2kg of melamine, 8kg of water, 2kg of adsorbent and 1kg of catalyst. Wherein the adsorbent is activated carbon powder, and the catalyst is sodium hydroxide.

In this preparation example, the thickened slurry was prepared as follows:

(1) Uniformly mixing a catalyst, an adsorbent, formaldehyde, cyclohexanone, melamine and water to obtain a raw material liquid;

(2) Heating the raw material liquid for 3 hours under the water bath condition of 90 ℃ to obtain a prepolymerization liquid;

(3) And (3) continuously heating the prepolymer liquid for 1h by using a boiling water bath, and then carrying out vacuum drying to obtain thickened slurry.

As shown in Table 1, preparation examples 1 to 5 were different in the ratio of raw materials for preparing the thickened slurry.

TABLE 1

Preparation example 6

This preparation differs from preparation 3 in that the catalyst is p.o42.5 Portland cement.

Preparation example 7

The preparation example differs from preparation example 6 in that the catalyst is formed by mixing Portland cement and sodium hydroxide according to a weight ratio of 1:1.

Preparation example 8

The difference between this preparation example and preparation example 7 is that the adsorbent is slag powder, which is S105-grade slag micropowder.

Preparation of filler

Preparation example 9

In this preparation, the filler was prepared as follows:

(1) Uniformly mixing 10kg of inorganic carrier, 2kg of sodium persulfate and 5kg of water, and removing water through vacuum drying to obtain an oxidant carrier; in the step, the inorganic carrier is magnesia powder conforming to the specification of HG/T2573-2012;

(2) Uniformly mixing an oxidant carrier, 10kg of acetone and 3kg of film forming agent, heating in a water bath until the film forming agent is completely dissolved in the acetone, cooling the obtained mixture, filtering and vacuum drying after a precipitate is generated in a liquid phase, and obtaining a filler; in this step, the film forming agent is paraffin wax.

Preparation example 10

The preparation example is different from the preparation example 9 in that the inorganic carrier is diatomite, and the diatomite accords with the specification of GB/T24265-2014.

PREPARATION EXAMPLE 11

This preparation differs from preparation 10 in that the film former is stearic acid.

Examples

Examples 1 to 5

The following description will take example 1 as an example.

Example 1

The embodiment provides an organosilicon slurry, which comprises the following components: 2kg of cyclohexanone, 14kg of filler, 8kg of silane coupling agent, 8kg of hydroxyl silicone oil, 6kg of thickening slurry and 18kg of water. Wherein the filler is diatomite, the CAS number of the hydroxyl silicone oil is 68554-71-2, the silane coupling agent is methyltriethoxysilane, and the thickening slurry is the thickening slurry of preparation example 1.

In this example, the anti-fouling anti-graffiti semi-silicon synthetic leather is prepared according to the following steps:

(1) Cutting the PU calendered cloth to obtain a polymer layer;

(2) Spreading an adhesive on the surface of the polymer layer, attaching a base cloth layer on the surface of the polymer layer, and drying and curing for 30min by using hot air at 150 ℃ to obtain a polymer layer bonded with the base cloth layer; in the step, the adhesive is single-component polyurethane glue;

(3) And (3) scraping and coating the organosilicon slurry on one side of the polymer layer, which is away from the base cloth layer, baking and curing for 15min by using hot air at 120 ℃, and rolling to obtain the antifouling and anti-graffiti semi-silicon synthetic leather.

As shown in Table 2, examples 1-5 are different in the main raw material ratios of the silicone slurry

TABLE 2

Examples 6 to 12

Examples 6-12 differ from example 3 in the preparation of thickened slurries, as shown in Table 3.

TABLE 3 Table 3

Sample of	Preparation example of thickened slurry	Sample of	Preparation example of thickened slurry
				Example 3	Preparation example 1	Example 9	Preparation example 5
Example 6	Preparation example 2	Example 10	Preparation example 6
				Example 7	Preparation example 3	Example 11	Preparation example 7
Example 8	Preparation example 4	Example 12	Preparation example 8

Example 13

The difference between this example and example 12 is that the polymer layer is a polyvinyl chloride layer, which is obtained by cutting a PVC rolled cloth.

Example 14

This example differs from example 13 in that the filler is that of preparation example 9.

Example 15

This example differs from example 14 in that the filler is the filler of preparation 10.

Example 16

This example differs from example 15 in that the filler is that of preparation 11.

Comparative example

Comparative example 1

The semi-silicon synthetic leather comprises a base cloth layer, a polymer layer and an organic silicon film layer which are sequentially laminated, wherein the polymer layer is a polyurethane layer or a polyvinyl chloride layer, and the organic silicon film layer is obtained by baking and solidifying organic silicon slurry. The organosilicon slurry comprises the following components: 16kg of filler, 10kg of silane coupling agent, 10kg of hydroxyl silicone oil and 20kg of water, wherein the filler is diatomite, the CAS number of the hydroxyl silicone oil is 68554-71-2, and the silane coupling agent is methyltriethoxysilane.

The preparation method of the semi-silicon synthetic leather of the comparative example comprises the following steps:

(1) Cutting the PU calendered cloth to obtain a polymer layer;

(2) Spreading an adhesive on the surface of the polymer layer, attaching a base cloth layer on the surface of the polymer layer, and drying and curing for 30min by using hot air at 150 ℃ to obtain a polymer layer bonded with the base cloth layer; in the step, the adhesive is single-component polyurethane glue; (3) And (3) scraping and coating the organosilicon slurry on one side of the polymer layer, which is away from the base cloth layer, baking and curing for 15min by using hot air at 120 ℃, and rolling to obtain the antifouling and anti-graffiti semi-silicon synthetic leather.

Comparative example 2

This comparative example differs from example 3 in that the components of the silicone slurry do not include a thickened slurry.

Comparative example 3

This comparative example differs from example 3 in that the cyclohexanone in the silicone slurry component is replaced entirely with water.

Performance detection test method

The adhesion fastness of the organosilicon film layer on the surface of the semi-silicon synthetic leather is detected by referring to GB/T4689.20-1996 leather coating adhesion fastness determination method, and the detection results are shown in Table 4.

TABLE 4 Table 4

Sample of	Adhesive fastness/(N/10 mm)	Sample of	Adhesive fastness/(N/10 mm)
				Example 1	11.4	Example 11	12.5
Example 2	11.5	Example 12	12.8
				Example 3	11.7	Example 13	14.2
Example 4	11.6	Example 14	14.5
				Example 5	11.5	Example 15	14.8
Example 6	11.8	Example 16	15.1
				Example 7	12.0	Comparative example 1	7.6
Example 8	11.9	Comparative example 2	7.7
				Example 9	11.7	Comparative example 3	8.1
Example 10	12.1	/	/

As can be seen in combination with examples 1-5 and comparative example 1 and Table 4, examples 1-5 have higher tack than comparative example 1, indicating that dissolution of cyclohexanone results in detangling of polymer segments on the surface of the polymer layer during the preparation of the semi-silicone synthetic leather of the present application. In the prepared semi-silicon synthetic leather, the organic silicon chain segments and the polymer chain segments are mutually wound, so that the combination degree between the organic silicon film layer and the polymer layer is increased, the possibility of peeling of the organic silicon film layer is reduced, and the durability of the antifouling performance of the synthetic leather is improved.

As can be seen from a combination of example 3 and comparative examples 2-3, and Table 4, the adhesion fastness measured in example 3 is higher than that measured in comparative examples 2-3, indicating that the silicone slurry of the present application requires dissolution of the polymer layer surface by cyclohexanone to obtain a silicone film layer with relatively good adhesion effect on the polymer layer surface.

It can be seen from the combination of examples 3 and examples 6 to 9 and the combination of Table 4 that, in the thickened slurries of preparation examples 1 to 5, the thickened slurries prepared in accordance with the formulation system of preparation example 3 are more conducive to the improvement of reduction of peeling of the silicone film layer, thereby improving the durability of the antifouling property of the synthetic leather.

As can be seen from the combination of examples 7, 10-11 and table 4, the adhesion strength measured in example 11 is higher than that measured in examples 10 and 11, which shows that when the catalyst contains both sodium hydroxide and silicate cement, silicate gel generated by the reaction of silicate cement and water can provide adhesion sites for the organosilicon crosslinked body in the organosilicon slurry, and can be cured together with the organosilicon crosslinked body, thereby being beneficial to improving the compactness of the organosilicon film layer, reducing the peeling of the organosilicon film layer and improving the durability of the antifouling performance of the synthetic leather.

Although the amount of Portland cement used in example 10 was greater than that in example 11, the polymerization degree of the copolymer of formaldehyde, cyclohexanone and melamine was limited because the amount of hydroxyl ions generated by Portland cement was limited, which was not conducive to the improvement of the compactness of the organosilicon film and had an influence on the adhesion effect of the organosilicon film. Example 11 relatively good catalytic effect was achieved after addition of portland cement and sodium hydroxide in a weight ratio of 1:1.

As can be seen from the combination of example 12 and example 11 and the combination of table 4, the adhesion fastness measured in example 12 is higher than that in example 11, which shows that when the slag powder is used as the adsorbent, the slag powder promotes the combination between silicate gel and organosilicon crosslinked body, the compactness of the organosilicon film layer is improved, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling property of the synthetic leather is improved.

As can be seen from the combination of example 13 and example 14 and the combination of table 4, when the polymer layer is a polyvinyl chloride layer, the filler of preparation example 9 is selected to improve the measured adhesion fastness, which means that in the process of baking and curing the organosilicon slurry, under the combined action of the rising of hydroxide ion concentration and baking and heating, part of chain segments in the polyvinyl chloride layer can be removed to generate double bonds, and at the moment, sodium persulfate dissolved out of the filler oxidizes newly generated double bonds in the polyvinyl chloride chain segments into hydroxyl groups, carboxyl groups and other groups, so that the affinity of the polyvinyl chloride layer to the silane coupling agent is enhanced, the bonding degree between the organosilicon film layer and the polymer layer is increased, the peeling of the organosilicon film layer is reduced, and the durability of the antifouling property of the synthetic leather is improved.

As can be seen by combining example 14 and example 15 with table 4, the adhesion fastness measured in example 15 is higher than that of example 14, which indicates that compared with magnesium oxide powder, diatomite is more easily combined with silicate gel in the organic silicon film layer, so that the compactness of the organic silicon film layer is improved, the peeling of the organic silicon film layer is reduced, the durability of the antifouling property of the synthetic leather is improved, and when stearic acid is selected as the film forming agent, stearic acid can be adhered to the surface of the polyvinyl chloride layer after being melted, the affinity between the polyvinyl chloride layer and the water phase is enhanced, the contact and oxidization of sodium persulfate and the polyvinyl chloride layer are facilitated, the affinity of the polyvinyl chloride layer to the silane coupling agent is enhanced, the combination degree between the organic silicon film layer and the polymer layer is increased, the peeling of the organic silicon film layer is reduced, and the durability of the antifouling property of the synthetic leather is improved.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (6)

1. The anti-fouling and anti-graffiti semi-silicon synthetic leather is characterized by comprising a base cloth layer, a polymer layer and an organic silicon film layer which are sequentially attached to each other along the thickness direction, wherein the polymer layer is a polyurethane layer or a polyvinyl chloride layer, and the organic silicon film layer is obtained by baking and solidifying after the organic silicon slurry is scraped to one side of the polymer layer, which is far away from the base cloth layer; the organic silicon slurry comprises the following components in parts by weight: 2-4 parts of cyclohexanone, 14-18 parts of filler, 8-12 parts of silane coupling agent, 8-12 parts of hydroxyl silicone oil, 6-10 parts of thickening slurry and 18-22 parts of water, wherein the thickening slurry is a copolymer obtained by polymerizing cyclohexanone, melamine and formaldehyde under the condition of excessive formaldehyde; the thickening slurry is obtained by heating and vacuum drying raw material liquid, and the raw material liquid comprises the following components in parts by weight: 6-8 parts of formaldehyde, 12-16 parts of cyclohexanone, 0.2-0.4 part of melamine, 8-12 parts of water, 2-4 parts of adsorbent and 1-2 parts of catalyst; the catalyst is sodium hydroxide and silicate cement;

the thickened slurry is prepared according to the following method:

(1) Uniformly mixing a catalyst, an adsorbent, formaldehyde, cyclohexanone, melamine and water to obtain a raw material liquid;

(2) Heating the raw material liquid for 2-4 hours under the water bath condition of 90-95 ℃ to obtain a prepolymerization liquid;

(3) And continuously heating the prepolymer liquid for 1-2h by using a boiling water bath, and then carrying out vacuum drying to obtain thickened slurry.

2. The anti-fouling and anti-graffiti semi-silicon synthetic leather according to claim 1, wherein the organic silicon slurry comprises the following components in parts by weight: 2.5-3.5 parts of cyclohexanone, 15-17 parts of filler, 9-11 parts of silane coupling agent, 9-11 parts of hydroxyl silicone oil, 7-9 parts of thickening slurry and 19-21 parts of water.

3. The anti-fouling and anti-graffiti semi-silicon synthetic leather according to claim 1, wherein the adsorbent is slag powder.

4. The anti-fouling and anti-graffiti semi-silicon synthetic leather according to claim 1, wherein the polymer layer is a polyvinyl chloride layer and the filler is prepared according to the following method:

(1) Uniformly mixing an inorganic carrier, sodium persulfate and water, and removing water through vacuum drying to obtain an oxidant carrier;

(2) Uniformly mixing an oxidant carrier, acetone and a film forming agent, heating until the film forming agent is completely dissolved in the acetone, cooling the mixture, filtering and vacuum drying after precipitation is generated in a liquid phase, and obtaining a filler; stearic acid is selected as the film forming agent.

5. The anti-fouling and anti-graffiti semi-silicon synthetic leather according to claim 4, wherein the inorganic carrier is diatomite.

6. The manufacturing process of the anti-fouling and anti-graffiti semi-silicon synthetic leather is characterized by comprising the following steps of:

(1) Cutting PU rolled cloth or PVC rolled cloth to obtain a polymer layer;

(2) Spreading an adhesive on the surface of the polymer layer, attaching a base cloth layer on the surface of the polymer layer, and drying and curing to obtain a polymer layer bonded with the base cloth layer;

(3) The organosilicon slurry of any one of claims 1-5 is coated on the side of the polymer layer away from the base cloth layer, and the antifouling and anti-graffiti semi-silicon synthetic leather is obtained after baking, solidifying and rolling.