A water-dispersible silica gel printing material and its preparation method and application method

Abstract

The present invention discloses a water-dispersible silica gel printing material, which comprises a mixture of component A and component B in a mass ratio of 100:10 to 100:15; the component A comprises, by weight: 100 parts of vinyl polysiloxane, 100 to 300 parts of deionized water, 3 to 10 parts of silane coupling agent, 2 to 5 parts of tetraethyl orthosilicate, 20 to 40 parts of white carbon black, 1 to 5 parts of boric acid, 8 to 15 parts of hydrogen-containing silicone oil and 0.5 to 1.5 parts of inhibitor; the component B comprises, by weight: 100 parts of hydroxyl vinyl modified silicone oil and 2.5 to 5 parts of platinum catalyst; and also discloses a preparation method and application of a water-dispersible silica gel printing material. The purpose of the present invention is to prepare a silica gel printing material that is uniform and stable in a water-dispersible system, which can be used in the field of screen printing, and has the advantages of low cost, complete environmental protection, good comprehensive performance, etc. compared with the currently commonly used organic solvent system silica gel slurry.

Description

Technical Field

[0001] The invention relates to the technical field of screen silica gel printing, and in particular to a water dispersion system silica gel printing material and a preparation method and an application method thereof. Background Art

[0002] In the field of textile printing, silicone has gradually become a popular printing material due to its advantages such as environmental protection, high and low temperature resistance, good elasticity and long life. In order to meet the requirements of low viscosity and high thixotropy required by the screen printing process, it is often necessary to adjust the viscosity, thixotropy and curing properties of silicone by adding some organic solvents. The added organic solvents are volatilized and released during the curing process, which not only increases the cost of printing materials, but also aggravates environmental pollution, offsetting the environmental advantages of silicone itself. For the commonly used addition-type silicone rubber materials, their own high hydrophobicity, high viscosity and long molecular chains make it very difficult to disperse in water. Therefore, the water-based silicone polymers currently mainly include water-based silicone oil products, while there are no mature products for water-based printing silicone.

[0003] Therefore, the development of water-based silicone printing materials is of great significance for further improving the performance of printing silicone materials and optimizing environmental protection needs. Summary of the invention

[0004] In order to solve the above technical problems, the present invention discloses a water-dispersed silica gel printing material and a preparation method and an application method thereof.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0006] A water-dispersible silica gel printing material, comprising a mixture of component A and component B in a mass ratio of 100:10 to 100:15;

[0007] The component A comprises, by weight: 100 parts of vinyl polysiloxane, 100-300 parts of deionized water, 3-10 parts of silane coupling agent, 2-5 parts of ethyl orthosilicate, 20-40 parts of white carbon black, 1-5 parts of boric acid, 8-15 parts of hydrogenated silicone oil and 0.5-1.5 parts of inhibitor;

[0008] The B component comprises, by weight: 100 parts of hydroxy vinyl modified silicone oil and 2.5 to 5 parts of platinum catalyst.

[0009] The above-mentioned water-dispersible silica gel printing material, wherein the vinyl polysiloxane is a polydiorganosiloxane containing two or more vinyl groups;

[0010] Optionally, the vinyl polysiloxane is a double-terminal vinyl polydimethylsiloxane with a viscosity of 500 to 3000 mPa·s and a vinyl content of 0.15 to 0.4%.

[0011] The above-mentioned water-dispersed silica gel printing material, wherein the silane coupling agent is glycidyl ether oxypropyl trimethoxy silane.

[0012] In the above-mentioned water-dispersed silica gel printing material, the white carbon black is a surface-treated fumed white carbon black.

[0013] The above-mentioned water-dispersed silica gel printing material, wherein the viscosity of the hydrogen-containing silicone oil is 50-100 mPa·s.

[0014] In the above-mentioned water-dispersible silica gel printing material, the inhibitor comprises one of methylbutynol and ethynylcyclohexanol or a mixture thereof in different proportions.

[0015] In the above-mentioned water-dispersed silica gel printing material, the hydroxy vinyl modified silicone oil is a hydroxy silicone oil with a viscosity of 50 to 100 mPa·s into which at least three vinyl groups are connected.

[0016] The above-mentioned water-dispersible silica gel printing material, wherein the platinum catalyst is an isopropanol solution of H2PtCl6, or a tetrahydrofuran solution, or a platinum complex coordinated by methylvinyl polysiloxane, or a mixture of several thereof;

[0017] Optionally, the Pt content of the platinum catalyst is 5000 ppm.

[0018] A method for preparing a water-dispersible silica gel printing material, the preparation method comprising the following steps:

[0019] Step 1, adding silane coupling agent, tetraethyl orthosilicate and boric acid to deionized water, stirring at a speed of 500 to 1000 rpm for 4 to 8 hours in a water bath at 50 to 60° C., to obtain a uniformly hydrolyzed mixed solution;

[0020] Step 2, placing vinyl polysiloxane, white carbon black, hydrogenated silicone oil and inhibitor in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40-50° C. for 4-6 hours, to obtain component A;

[0021] Step 3, dispersing the platinum catalyst in the hydroxy vinyl modified silicone oil to obtain component B.

[0022] An application method of a water-dispersible silica gel printing material, the application method comprising the following steps:

[0023] Step A, according to different application construction temperatures, component A and component B are prepared into a water-dispersible system silica gel printing material in a mass ratio of 100:10 to 100:15, and a water-dispersible system printing coating is obtained by screen printing;

[0024] Step B, drying and curing the water dispersion system printing coating at 100-105° C. to obtain a silica gel printing product.

[0025] The beneficial effects of the present invention include the following steps:

[0026] (1) The purpose of the present invention is to prepare a uniform and stable silica gel printing material in a water dispersion system, which can be used in the field of screen printing. Compared with the commonly used organic solvent system silica gel slurry, it has the advantages of low cost, complete environmental protection, good comprehensive performance, etc.;

[0027] (2) The present invention utilizes the hydrophilic groups of the silane coupling agent to combine with water molecules, so that the water molecules are connected to the hydrophobic groups of the silane coupling agent. At the same time, the hydrolysis reaction of the appropriate proportion of the tetraethyl orthosilicate and boric acid is used to adjust the pH value of the aqueous solution, thereby controlling the degree of hydrolysis of the coupling molecules and preventing the silane coupling agent molecules from undergoing polymerization reactions themselves, thereby affecting the independent dispersion of the hydrophobic groups.

[0028] (3) The hydrolysis product of tetraethyl orthosilicate and boric acid is used as a cross-linking intermediate product to be inserted between the long molecular chains of the vinyl polysiloxane as an intermediate layer molecule. On the one hand, the mutual entanglement of the molecular chains of the vinyl polysiloxane is reduced. On the other hand, the hydrophobic groups of the vinyl polysiloxane are made compatible with the hydrophobic groups coupled to the water molecules, so that the silica gel molecules are stably present in the water system, which contributes to the uniform stability of the silica gel printing material while maintaining good comprehensive performance. DETAILED DESCRIPTION

[0029] The present invention is further described below by means of specific embodiments to make the technical solution of the present invention easier to understand and grasp, rather than to limit the present invention.

[0030] The present invention provides a water-dispersible silica gel printing material, which comprises a mixture of component A and component B in a mass ratio of 100:10 to 100:15;

[0031] The component A comprises, by weight: 100 parts of vinyl polysiloxane, 100-300 parts of deionized water, 3-10 parts of silane coupling agent, 2-5 parts of ethyl orthosilicate, 20-40 parts of white carbon black, 1-5 parts of boric acid, 8-15 parts of hydrogenated silicone oil and 0.5-1.5 parts of inhibitor;

[0032] The B component comprises, by weight: 100 parts of hydroxy vinyl modified silicone oil and 2.5 to 5 parts of platinum catalyst.

[0033] Preferably, the vinyl polysiloxane is a polydiorganosiloxane containing two or more vinyl groups;

[0034] Optionally, the vinyl polysiloxane is a double-terminal vinyl polydimethylsiloxane with a viscosity of 500 to 3000 mPa·s and a vinyl content of 0.15 to 0.4%.

[0035] Preferably, the silane coupling agent is glycidyloxypropyltrimethoxysilane.

[0036] Preferably, the silica is surface-treated fumed silica.

[0037] Preferably, the viscosity of the hydrogen-containing silicone oil is 50-100 mPa·s.

[0038] Preferably, the inhibitor comprises methylbutynol, ethynylcyclohexanol or a mixture thereof in different proportions.

[0039] Preferably, the hydroxy vinyl modified silicone oil is a hydroxy silicone oil having a viscosity of 50 to 100 mPa·s into which at least three vinyl groups are connected.

[0040] Preferably, the platinum catalyst is an isopropanol solution of H2PtCl6, or a tetrahydrofuran solution, or a platinum complex coordinated by methylvinyl polysiloxane, or a mixture of the above;

[0041] Optionally, the Pt content of the platinum catalyst is 5000 ppm.

[0042] The present invention also discloses a method for preparing a water-dispersed silica gel printing material, which comprises the following steps:

[0043] Step 1, adding silane coupling agent, tetraethyl orthosilicate and boric acid to deionized water, stirring at a speed of 500 to 1000 rpm for 4 to 8 hours in a water bath at 50 to 60° C., to obtain a uniformly hydrolyzed mixed solution;

[0044] Step 2, placing vinyl polysiloxane, white carbon black, hydrogenated silicone oil and inhibitor in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40-50° C. for 4-6 hours, to obtain component A;

[0045] Step 3, dispersing the platinum catalyst in the hydroxy vinyl modified silicone oil to obtain component B.

[0046] The present invention discloses an application method of a water-dispersible silica gel printing material, and the application method comprises the following steps:

[0047] Step A, according to different application construction temperatures, component A and component B are prepared into a water-dispersible system silica gel printing material in a mass ratio of 100:10 to 100:15, and a water-dispersible system printing coating is obtained by screen printing;

[0048] Step B, drying and curing the water dispersion system printing coating at 100-105° C. to obtain a silica gel printing product.

[0049] The preparation method of the present invention is now described in detail in the following embodiments:

[0050] Embodiment 1: This embodiment discloses a water-dispersible silica gel printing material, and its specific preparation and application steps include:

[0051] Step 1, adding 5 parts of glycidyloxypropyltrimethoxysilane, 3 parts of ethyl orthosilicate and 3 parts of boric acid to 200 parts of deionized water, stirring in a water bath at 50° C. and 800 rpm for 5 hours to obtain a uniformly hydrolyzed mixed solution;

[0052] Step 2, placing 100 parts of double-terminated vinyl polydimethylsiloxane, 30 parts of surface-treated fumed silica, 10 parts of hydrogenated silicone oil and 1 part of methyl butynol in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 50° C. for 5 hours to obtain component A; wherein the viscosity of the double-terminated vinyl polydimethylsiloxane is 1000 mPa·s, and the vinyl content is 0.3%; the viscosity of the hydrogenated silicone oil is 80 mPa·s;

[0053] Step 3, dispersing 4 parts of an isopropanol solution of H2PtCl6 with a Pt content of 5000 ppm in 100 parts of hydroxy vinyl modified silicone oil to obtain component B;

[0054] Step 4, at room temperature, component A and component B are prepared into a water-dispersible system silicone printing material in a mass ratio of 100:12, and the water-dispersible system printing coating is obtained on a knitted T-shirt fabric by screen printing;

[0055] Step 5, baking and curing the water dispersion system printing coating at 100° C. to obtain a silica gel printing product.

[0056] Embodiment 2: This embodiment discloses a water-dispersible silica gel printing material, and its specific preparation and application steps include:

[0057] Step 1, adding 8 parts of glycidyloxypropyltrimethoxysilane, 4 parts of ethyl orthosilicate and 3 parts of boric acid to 200 parts of deionized water, stirring in a water bath at 50° C. and 800 rpm for 5 hours to obtain a uniformly hydrolyzed mixed solution;

[0058] Step 2, placing 100 parts of double-terminated vinyl polydimethylsiloxane, 30 parts of surface-treated fumed silica, 10 parts of hydrogenated silicone oil and 1 part of methyl butynol in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 50° C. for 5 hours to obtain component A; wherein the viscosity of the double-terminated vinyl polydimethylsiloxane is 1000 mPa·s, and the vinyl content is 0.3%; the viscosity of the hydrogenated silicone oil is 80 mPa·s;

[0059] Step 3, dispersing 4 parts of an isopropanol solution of H2PtCl6 with a Pt content of 5000 ppm in 100 parts of hydroxy vinyl modified silicone oil to obtain component B;

[0060] Step 4, at room temperature, component A and component B are prepared into a water-dispersible system silicone printing material in a mass ratio of 100:12, and the water-dispersible system printing coating is obtained on a knitted T-shirt fabric by screen printing;

[0061] Step 5, baking and curing the water dispersion system printing coating at 100° C. to obtain a silica gel printing product.

[0062] Embodiment 3: This embodiment discloses a water-dispersible silica gel printing material, and its specific preparation and application steps include:

[0063] Step 1, adding 3 parts of glycidyloxypropyltrimethoxysilane, 2 parts of ethyl orthosilicate and 3 parts of boric acid to 100 parts of deionized water, stirring in a water bath at 50° C. and 800 rpm for 8 hours to obtain a uniformly hydrolyzed mixed solution;

[0064] Step 2, placing 100 parts of double-terminated vinyl polydimethylsiloxane, 25 parts of surface-treated fumed silica, 8 parts of hydrogenated silicone oil and 0.5 parts of ethynyl cyclohexanol in a disperser, stirring and dispersing them uniformly, and then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40° C. for 6 hours to obtain component A; wherein the viscosity of the double-terminated vinyl polydimethylsiloxane is 1500 mPa·s, and the vinyl content is 0.15%; the viscosity of the hydrogenated silicone oil is 100 mPa·s;

[0065] Step 3, dispersing 2.5 parts of an isopropanol solution of H2PtCl6 with a Pt content of 5000 ppm in 100 parts of hydroxy vinyl modified silicone oil to obtain component B;

[0066] Step 4, at room temperature, component A and component B are prepared into a water-dispersible system silica gel printing material in a mass ratio of 100:10, and the water-dispersible system printing coating is obtained on a knitted T-shirt fabric by screen printing;

[0067] Step 5, baking and curing the water dispersion system printing coating at 100° C. to obtain a silica gel printing product.

[0068] Embodiment 4: This embodiment discloses a water-dispersible silica gel printing material, and its specific preparation and application steps include:

[0069] Step 1, adding 5 parts of glycidyloxypropyltrimethoxysilane, 3 parts of ethyl orthosilicate and 5 parts of boric acid to 200 parts of deionized water, stirring in a water bath at 50° C. and 1000 rpm for 5 hours to obtain a uniformly hydrolyzed mixed solution;

[0070] Step 2, placing 100 parts of double-terminated vinyl polydimethylsiloxane, 20 parts of surface-treated fumed silica, 10 parts of hydrogenated silicone oil and 1 part of ethynyl cyclohexanol in a disperser, stirring and dispersing them uniformly, and then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40° C. for 4 hours to obtain component A; wherein the viscosity of the double-terminated vinyl polydimethylsiloxane is 1000 mPa·s, and the vinyl content is 0.3%; the viscosity of the hydrogenated silicone oil is 80 mPa·s;

[0071] Step 3, dispersing 3 parts of a tetrahydrofuran solution of H2PtCl6 with a Pt content of 5000 ppm in 100 parts of a hydroxy vinyl modified silicone oil to obtain a component B;

[0072] Step 4, at room temperature, component A and component B are prepared into a water-dispersible system silicone printing material in a mass ratio of 100:12, and the water-dispersible system printing coating is obtained on a knitted T-shirt fabric by screen printing;

[0073] Step 5, baking and curing the water dispersion system printing coating at 100° C. to obtain a silica gel printing product.

[0074] Embodiment 5: This embodiment discloses a water-dispersible silica gel printing material, and its specific preparation and application steps include:

[0075] Step 1, adding 10 parts of glycidyloxypropyltrimethoxysilane, 5 parts of ethyl orthosilicate and 1 part of boric acid to 300 parts of deionized water, stirring in a water bath at 50° C. and 500 rpm for 4 hours to obtain a uniformly hydrolyzed mixed solution;

[0076] Step 2, placing 100 parts of double-terminal vinyl polydimethylsiloxane, 40 parts of surface-treated fumed silica, 15 parts of hydrogenated silicone oil and 1.5 parts of methyl butynol in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 50° C. for 6 hours to obtain component A; wherein the viscosity of the double-terminal vinyl polydimethylsiloxane is 1000 mPa·s, and the vinyl content is 0.4%; the viscosity of the hydrogenated silicone oil is 50 mPa·s;

[0077] Step 3, dispersing 5 parts of a tetrahydrofuran solution of H2PtCl6 with a Pt content of 5000 ppm in 100 parts of hydroxy vinyl modified silicone oil to obtain component B;

[0078] Step 4, at room temperature, component A and component B are prepared into a water-dispersible system silica gel printing material in a mass ratio of 100:15, and the water-dispersible system printing coating is obtained on a knitted T-shirt fabric by screen printing;

[0079] Step 5, baking and curing the water dispersion system printing coating at 100° C. to obtain a silica gel printing product.

[0080] Comparative Example 1: This comparative example uses our company's commercial printing silica gel product, adds 30-50% organic solvent (white oil) to dilute, and meets the requirements of screen printing process. The printed product is screen printed on the same knitted T-shirt fabric, and dried and cured at 100℃ to obtain a comparative sample of organic solvent system silica gel printing product.

[0081] The basic performance parameters of the silica gel printing products prepared in Examples 1 to 5 and Comparative Example 1 were measured, and the detailed test results are shown in Table 1.

[0082] Table 1 Basic performance parameter measurement results

[0083]

[0084] From the test results in Table 1 above, it can be seen that the water-based printing silicone is comparable to conventional commercial organic solvent-based printing silicone in terms of bonding firmness and resistance to washing at 40°C and 60°C, and both meet the printing requirements. Due to the different basic components of the silicone used, the hardness of the water-based printing silicone is slightly lower than that of conventional commercial printing silicone products, and is more suitable for the application of soft base fabrics. Due to the slightly lower content of polysiloxane in the water-based printing silicone, the tensile elongation at break is also slightly lower than that of the organic system printing silicone, but it still retains the advantage of silicone elasticity.

[0085] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention by using the technical means and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention without departing from the content of the technical solution of the present invention should be covered by the protection scope of the present invention.

Claims

1. A water-dispersible silica gel printing material, characterized in that: It includes a mixture of component A and component B in a mass ratio of 100:10 to 100:15; The component A comprises, by weight: 100 parts of vinyl polysiloxane, 100-300 parts of deionized water, 3-10 parts of silane coupling agent, 2-5 parts of ethyl orthosilicate, 20-40 parts of white carbon black, 1-5 parts of boric acid, 8-15 parts of hydrogenated silicone oil and 0.5-1.5 parts of inhibitor; The B component includes, by weight: 100 parts of hydroxy vinyl modified silicone oil and 2.5 to 5 parts of platinum catalyst; Wherein, the vinyl polysiloxane contains two or more vinyl groups; The silane coupling agent is glycidyloxypropyltrimethoxysilane; The preparation method of the A component comprises the following steps: Step 1, adding silane coupling agent, tetraethyl orthosilicate and boric acid to deionized water, stirring at a speed of 500-1000 rpm for 4-8 hours in a water bath at 50-60° C. to obtain a uniformly hydrolyzed mixed solution; Step 2, placing vinyl polysiloxane, white carbon black, hydrogenated silicone oil and inhibitor in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40-50° C. for 4-6 hours, to obtain the A component.

2. The water-dispersed silica gel printing material according to claim 1, characterized in that: The vinyl polysiloxane is a double-terminal vinyl polydimethylsiloxane with a viscosity of 500 to 3000 mPa·s and a vinyl content of 0.15 to 0.4%.

3. The water-dispersed silica gel printing material according to claim 2, characterized in that: The white carbon black is a surface-treated fumed white carbon black.

4. The water-dispersed silica gel printing material according to claim 3, characterized in that: The viscosity of the hydrogen-containing silicone oil is 50-100 mPa·s.

5. The water-dispersed silica gel printing material according to claim 4, characterized in that: The inhibitor comprises methylbutynol, ethynylcyclohexanol or a mixture thereof in different proportions.

6. The water-dispersed silica gel printing material according to claim 5, characterized in that: The hydroxy vinyl modified silicone oil is a hydroxy silicone oil with a viscosity of 50 to 100 mPa·s in which at least three vinyl groups are connected.

7. The water-dispersed silica gel printing material according to claim 6, characterized in that: The platinum catalyst is an isopropanol solution of H2PtCl6, a tetrahydrofuran solution, or a platinum complex coordinated by methylvinyl polysiloxane, or a mixture of the above.

8. The water-dispersed silica gel printing material according to claim 7, characterized in that: The Pt content of the platinum catalyst is 5000 ppm.

9. A method for preparing the water-dispersed silica gel printing material according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: Step 1, adding silane coupling agent, tetraethyl orthosilicate and boric acid to deionized water, stirring at a speed of 500-1000 rpm for 4-8 hours in a water bath at 50-60° C. to obtain a uniformly hydrolyzed mixed solution; Step 2, placing vinyl polysiloxane, white carbon black, hydrogenated silicone oil and inhibitor in a disperser, stirring and dispersing them uniformly, then gradually adding the uniformly hydrolyzed mixed solution, dispersing at 40-50° C. for 4-6 hours, to obtain component A; Step 3, dispersing the platinum catalyst in the hydroxy vinyl modified silicone oil to obtain component B.

10. A method for applying the water-dispersed silica gel printing material according to any one of claims 1 to 8, characterized in that: The application method includes the following steps: Step A, according to different application construction temperatures, component A and component B are prepared into a water-dispersible system silica gel printing material in a mass ratio of 100:10 to 100:15, and a water-dispersible system printing coating is obtained by screen printing; Step B, drying and curing the water dispersion system printing coating at 100-105° C. to obtain a silica gel printing product.

Images