A matte hydrophilic coating treatment liquid for rubber sheets and preparation method thereof

Abstract

The present invention provides a hydrophilic coating treatment liquid for matte rubber sheets and a preparation method thereof. The hydrophilic coating treatment liquid comprises the following components by mass percentage: 45% to 62% of nano-scale silicon carbide modified polyacrylate, 0.05% to 0.1% of anionic surfactant, 0.4% to 2.0% of leveling agent, 0.3% to 0.5% of water-based defoaming agent, 0.5% to 1.5% of emulsifier, and the balance is deionized water. The rubber sheet coating treated with the hydrophilic coating treatment liquid of the present invention has a matte gloss, a smooth appearance, good adhesion to the rubber surface, and has better stain resistance and aging resistance than the rubber boot coating prepared with a solvent-based surface treatment agent.

Description

Technical Field

[0001] The invention relates to the technical field of rubber product treatment liquid, and in particular to a matte hydrophilic coating treatment liquid for rubber sheets and a preparation method thereof. Background Art

[0002] The matte property of rubber sheets refers to a special surface treatment effect achieved by changing the texture and chemical composition of the rubber surface. The surface of matte rubber is relatively rough and does not reflect light easily, thus showing a matte effect. Matte rubber has a wide range of applications, including automobiles, electronics, medical treatment, sports equipment and other fields. Its main advantages include: good anti-slip performance, good wear resistance and good aesthetics.

[0003] At present, in the field of rubber film product manufacturing, xylene solvent-based matting oil is usually used to form a coating on the product surface after dipping or spraying to achieve a matte effect. The use of solvent-based matting oil produces a large amount of VOC volatilization during the production process, which not only causes air pollution, but also easily causes fires, and also seriously affects the occupational health of workers. There is an urgent need for water-based environmentally friendly products that are harmless to the environment and human body to replace the original solvent-based products. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a matte hydrophilic coating treatment liquid for rubber sheets and a preparation method thereof. The rubber sheet coating treated with the hydrophilic coating treatment liquid has a matte luster, a smooth appearance, and good adhesion to the rubber surface. It has better stain resistance and aging resistance than the rubber boot coating prepared with a solvent-based surface treatment agent.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present application discloses a hydrophilic coating treatment liquid for matte finish of a rubber sheet, which comprises the following components calculated by mass percentage: 45% to 62% of nano-scale silicon carbide modified polyacrylate, 0.05% to 0.1% of anionic surfactant, 0.4% to 2.0% of leveling agent, 0.3% to 0.5% of aqueous defoaming agent, 0.5% to 1.5% of emulsifier, and the balance is deionized water.

[0007] Preferably, the hydrophilic coating treatment liquid includes the following components calculated by mass percentage: 54% nano-scale silicon carbide modified polyacrylate, 0.07% anionic surfactant, 1.5% leveling agent, 0.4% water-based defoaming agent, 1.0% emulsifier, and the balance is deionized water.

[0008] Preferably, the leveling agent comprises: 0.2-1.0% of chlorpyrifos and 0.2-1.0% of silane coupling agent.

[0009] Preferably, the anionic surfactant is FS-60, the aqueous defoamer is T-4034, and the emulsifier is OP-10.

[0010] Preferably, the preparation method of the nano-scale silicon carbide modified polyacrylate is as follows:

[0011] S1. Open the circulating water jacket, add 50-75 parts of methacryloxypropyltrimethoxysilane and 20-70 parts of dipropylene glycol in a stirred tank, and stir and react for 3 hours at room temperature to prepare a nano-silicon carbide aqueous dispersion solution;

[0012] S2, weigh 0.2 parts of N-hydroxymethyl acrylamide, 0.2 parts of cetyl ammonium bromide, 0.15 parts of lauryl alcohol, 0.2 parts of potassium hydroxide / ammonia pH regulator and 20 parts of deionized water in proportion, and mix them evenly to obtain an initiator buffer solution;

[0013] S3. Take 15 parts of the nano-silicon carbide aqueous dispersion solution obtained in step S1 and 25 parts of deionized water, add them into a reactor, stir at a speed of 150 r / min, and slowly add the initiator buffer solution obtained in step S2, then add 12.5 parts of double-bond polymerizable monomers and disperse for 35 minutes. Heat to 50°C-65°C and stir to react for 1.5 hours, then uniformly add 12.5 parts of double-bond polymerizable monomers, add them over 1.5 hours, keep the reaction warm for 2 hours, cool in a cycle, discharge the material, and obtain an organosilicon-modified polyacrylate emulsion (i.e., nano-scale silicon carbide modified polyacrylate).

[0014] Preferably, the double-bond polymerizable monomer is prepared by uniformly mixing the following raw materials in parts by weight into a monomer tank: 5 parts of butyl acrylate, 5 parts of methyl acrylate and 15 parts of acrylic acid.

[0015] Preferably, the hydrophilic coating treatment solution further comprises the following components calculated by mass percentage: 2.0% of lauryl alcohol ester or 2.3% of sodium hexametaphosphate.

[0016] The present application also discloses a method for preparing a matte hydrophilic coating treatment liquid for a rubber sheet, comprising the following steps:

[0017] S1, synthesis of nano-scale silicon carbide modified polyacrylate;

[0018] S2. Add nano-scale silicon carbide modified polyacrylate to a stainless steel vertical reactor, weigh and add anionic surfactant, leveling agent, water-based defoaming agent, and emulsifier, stir at room temperature for 1.5 hours, add deionized water and stir for 1.5 hours, filter the material to obtain a matte hydrophilic coating treatment liquid for rubber sheets.

[0019] Preferably, in step S2, the pH is adjusted to 7 using potassium hydroxide / ammonia pH adjuster.

[0020] Preferably, in step S2, the anionic surfactant and the aqueous defoamer are first mixed uniformly to obtain a pre-dispersion solution, which is then mixed uniformly with the nano-scale silicon carbide modified polyacrylate, and then a leveling agent and an emulsifier are added, and subsequent operations are performed.

[0021] The beneficial effects of the present invention are:

[0022] Nano-scale silicon carbide modified polyacrylate itself has a matte effect in film formation. It belongs to long-chain silicon carbide modified polyacrylate, which is resistant to yellowing, has high flexural resistance and good aging resistance. Nano-scale silicon carbide modified polyacrylate belongs to adhesives, dodecyl alcohol ester and sodium hexametaphosphate belong to film-forming aids, and nano-scale silicon carbide modified polyacrylate is blended with dodecyl alcohol ester or sodium hexametaphosphate and other additives to prepare a hydrophilic coating treatment liquid, which is used to treat rubber sheets. The resulting coating has good cold resistance and hydrolysis resistance. Pingpingjia and silane coupling agent form a leveling agent, which makes nano-scale silicon carbide modified polyacrylate have better wetting and leveling properties, fully extend on the surface of rubber film, and then make the rubber surface achieve a uniform matte effect. This application changes the traditional technology of using xylene solvent-based matting oil to matte the surface of rubber products, reduces the emission of VOCs in the production system, and is beneficial to protecting the physical and mental health of workers. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present application discloses a hydrophilic coating treatment liquid for matte finish of a rubber sheet, which comprises the following components calculated by mass percentage: 45% to 62% of nano-scale silicon carbide modified polyacrylate, 0.05% to 0.1% of anionic surfactant, 0.4% to 2.0% of leveling agent, 0.3% to 0.5% of aqueous defoaming agent, 0.5% to 1.5% of emulsifier, and the balance is deionized water.

[0025] The leveling agent includes: 0.2-1.0% of leveling agent and 0.2-1.0% of silane coupling agent.

[0026] The anionic surfactant is FS-60, the aqueous defoamer is T-4034, and the emulsifier is OP-10.

[0027] The preparation method of nano-scale silicon carbide modified polyacrylate is as follows:

[0028] S1. Open the circulating water jacket, add 50-75 parts of methacryloxypropyltrimethoxysilane and 20-70 parts of dipropylene glycol in a stirred tank, and stir and react for 3 hours at room temperature to prepare a nano-silicon carbide aqueous dispersion solution;

[0029] S2, weigh 0.2 parts of N-hydroxymethyl acrylamide, 0.2 parts of cetyl ammonium bromide, 0.15 parts of lauryl alcohol, 0.2 parts of potassium hydroxide / ammonia pH regulator and 20 parts of deionized water in proportion, and mix them evenly to obtain an initiator buffer solution;

[0030] S3, add 15 parts of the nano-silicon carbide aqueous dispersion solution obtained in step S1 and 25 parts of deionized water into a reactor, stir at a speed of 150 r / min, slowly add the initiator buffer solution obtained in step S2, then add 12.5 parts of double-bond polymerizable monomer and disperse for 35 minutes, heat to 50°C-65°C and stir to react for 1.5 hours, then uniformly add 12.5 parts of double-bond polymerizable monomer, add all over within 1.5 hours, keep warm for 2 hours, cycle cold cooling, discharge, and obtain an organosilicon-modified polyacrylate emulsion;

[0031] The double-bond polymerizable monomer is prepared by uniformly mixing the following raw materials in parts by weight into a monomer tank: 5 parts of butyl acrylate, 5 parts of methyl acrylate and 15 parts of acrylic acid.

[0032] Preferably, the hydrophilic coating treatment solution further comprises the following components calculated by mass percentage: 2.0% of lauryl alcohol ester or 2.3% of sodium hexametaphosphate.

[0033] The present application also discloses a method for preparing a matte hydrophilic coating treatment liquid for a rubber sheet, the preparation method comprising the following steps:

[0034] S1, synthesis of nano-scale silicon carbide modified polyacrylate;

[0035] S2. First, mix the anionic surfactant and the aqueous defoamer evenly to obtain a pre-dispersion solution and add it into a stainless steel vertical reactor. Then, add nano-scale silicon carbide modified polyacrylate and mix evenly. Weigh and add a leveling agent, an emulsifier, and 2.0% of dodecyl ester or sodium hexametaphosphate. After stirring at room temperature for 1.5 hours, adjust the pH to 7 with a potassium hydroxide / ammonia pH regulator, add deionized water and stir for 1.5 hours, and filter the material to obtain a matte hydrophilic coating treatment liquid for rubber sheets.

[0036] The present application has made multiple embodiments of improved designs on the ratio of nano-scale silicon carbide modified polyacrylate, and the remaining process steps and parameters are the same, as follows:

[0037] Embodiment 1:

[0038] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 45% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0039] Embodiment 2:

[0040] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 48% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0041] Embodiment 3:

[0042] A hydrophilic coating treatment liquid for matte rubber sheets comprises the following components by mass percentage: 50% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 0.4% of T-4034, 1.0% of OP-10, and the balance is deionized water.

[0043] Embodiment 4:

[0044] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 52% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0045] Embodiment 5:

[0046] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 54% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0047] Embodiment 6:

[0048] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 56% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0049] Embodiment 7:

[0050] A hydrophilic coating treatment liquid for matte rubber sheets comprises the following components by mass percentage: 58% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0051] Embodiment 8:

[0052] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 60% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0053] Embodiment 9:

[0054] A matte hydrophilic coating treatment liquid for a rubber sheet comprises the following components by mass percentage: 62% of nano-scale silicon carbide modified polyacrylate, 0.07% of FS-60, 0.4-2.0% of leveling agent, 40.4% of T-403, 1.0% of OP-10, and the balance is deionized water.

[0055] Comparative Example 1

[0056] The solvent-based surface treatment agent coating used is composed of the following components calculated by weight percentage: 50% of p-xylene solution, 15% of 800# solvent-based matting powder solution, 5.00% of SBS solution, and 34.5% of 200# solvent gasoline.

[0057] Comparative Example 2

[0058] The solvent-based surface treatment agent coating used is composed of the following components calculated by weight percentage: 40% of p-xylene solution, 10% of 800# solvent-based matting powder solution, 5.00% of SBS solution, and 45.5% of 200# solvent gasoline.

[0059] Comparative Example 3

[0060] The solvent-based surface treatment agent coating used is composed of the following components calculated by weight percentage: 30.5% of p-xylene solution, 10% of 800# solvent-based matting powder solution, 5.00% of SBS solution, and 55.5% of 200# solvent gasoline.

[0061] The comparative data of the coating of the solvent-based treatment agent used in the examples of the present application and in the prior art are shown in Table 1 below.

[0062] Table 1: Comparison of technical effects

[0063]

[0064] Nano-scale silicon carbide modified polyacrylate itself has a matte film-forming effect. It belongs to long-chain silicon carbide modified polyacrylate, which is resistant to yellowing, high in flexural resistance and good in aging resistance. Nano-scale silicon carbide modified polyacrylate is an adhesive, and dodecyl alcohol ester and sodium hexametaphosphate are film-forming aids. Nano-scale silicon carbide modified polyacrylate is blended with dodecyl alcohol ester or sodium hexametaphosphate and other additives to prepare a hydrophilic coating treatment liquid, which is used to treat rubber sheets. The resulting coating has good cold resistance and hydrolysis resistance. Percalin and silane coupling agent form a leveling agent, which makes nano-scale silicon carbide modified polyacrylate have better wetting and leveling properties, fully extend on the surface of rubber sheets, and thus make the rubber surface achieve a uniform matte effect.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A matte hydrophilic coating treatment liquid for a rubber sheet, characterized in that: The hydrophilic coating treatment liquid comprises the following components calculated by mass percentage: 45% to 62% of nanometer-grade silicon carbide modified polyacrylate, 0.05% to 0.1% of anionic surfactant, 0.4% to 2.0% of leveling agent, 0.3% to 0.5% of water-based defoaming agent, 0.5% to 1.5% of emulsifier, and the balance is deionized water.

2. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 1, characterized in that: The hydrophilic coating treatment liquid comprises the following components calculated by mass percentage: 54% of nano-scale silicon carbide modified polyacrylate, 0.07% of anionic surfactant, 1.5% of leveling agent, 0.4% of water-based defoaming agent, 1.0% of emulsifier, and the balance is deionized water.

3. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 2, characterized in that: The leveling agent comprises: 0.2-1.0% of chlorpyrifos and 0.2-1.0% of silane coupling agent.

4. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 3, characterized in that: The anionic surfactant is FS-60, the aqueous defoamer is T-4034, and the emulsifier is OP-10.

5. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 3, characterized in that: The preparation method of the nano-scale silicon carbide modified polyacrylate is as follows: S1. Open the circulating water jacket, add 50-75 parts of methacryloxypropyltrimethoxysilane and 20-70 parts of dipropylene glycol in a stirred tank, and stir and react for 3 hours at room temperature to prepare a nano-silicon carbide aqueous dispersion solution; S2, weigh 0.2 parts of N-hydroxymethyl acrylamide, 0.2 parts of cetyl ammonium bromide, 0.15 parts of lauryl alcohol, 0.2 parts of potassium hydroxide / ammonia pH regulator and 20 parts of deionized water in proportion, and mix them evenly to obtain an initiator buffer solution; S3. Take 15 parts of the nano-silicon carbide aqueous dispersion solution obtained in step S1 and 25 parts of deionized water, add them into a reactor, stir at a speed of 150 r / min, and slowly add the initiator buffer solution obtained in step S2, then add 12.5 parts of double-bond polymerizable monomer and disperse for 35 minutes. Heat to 50°C-65°C and stir to react for 1.5 hours, then uniformly add 12.5 parts of double-bond polymerizable monomer, add it all within 1.5 hours, keep the reaction warm for 2 hours, cool it in a cycle, discharge the material, and obtain a silicone-modified polyacrylate emulsion.

6. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 5, characterized in that: The double-bond polymerizable monomer is prepared by uniformly mixing the following raw materials in parts by weight into a monomer tank: 5 parts of butyl acrylate, 5 parts of methyl acrylate and 15 parts of acrylic acid.

7. The matte hydrophilic coating treatment liquid for rubber sheets according to claim 5, characterized in that: The hydrophilic coating treatment liquid further comprises the following components calculated by mass percentage: 2.0% of lauryl alcohol ester or 2.3% of sodium hexametaphosphate.

8. A method for preparing a matte hydrophilic coating treatment liquid for a rubber sheet according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1, synthesis of nano-scale silicon carbide modified polyacrylate; S2. Add nano-scale silicon carbide modified polyacrylate to a stainless steel vertical reactor, weigh and add anionic surfactant, leveling agent, water-based defoaming agent, and emulsifier, stir at room temperature for 1.5 hours, add deionized water and stir for 1.5 hours, filter the material to obtain a matte hydrophilic coating treatment liquid for rubber sheets.

9. The method for preparing a matte hydrophilic coating treatment liquid for rubber sheets according to claim 8, characterized in that: In step S2, the pH is adjusted to 7 using potassium hydroxide / ammonia pH adjuster.

10. The method for preparing a matte hydrophilic coating treatment liquid for rubber sheets according to claim 8, characterized in that: In step S2, anionic surfactant and aqueous defoamer are firstly mixed uniformly to obtain a pre-dispersion solution, which is then mixed uniformly with nano-scale silicon carbide modified polyacrylate, and then a leveling agent and an emulsifier are added, and subsequent operations are performed.

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