Rubber paint and preparation method thereof

Abstract

The present application relates to the field of coating technology, and specifically discloses a rubber paint and a preparation method thereof. A kind of rubber paint includes component A; component A is made of the following raw materials in percentage by weight: polyurethane 39.26-51.38%, isocyanate curing agent 5.27-7.69%, n-butanol 19.58-36.73%, elastic powder 7.28-11.26%, leveling agent 2.02-4.26%, matte powder 5.37-8.25%; its preparation method is: after polyurethane, n-butanol, elastic powder, leveling agent and matte powder are stirred and mixed, isocyanate curing agent is added, stirred and mixed, and rubber paint is obtained. The rubber paint of the present application can be sprayed on the surface of frequently used objects such as wooden pencils, so that the surface of the pencil has a thick sense and a smooth and delicate sense, which is conducive to improving the use feel of the pencil and can effectively alleviate the situation where the fingers appear indentations after using the pencil for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of coatings, and more specifically, to a rubber paint and a preparation method thereof. Background Art

[0002] Pencils are the main writing tools in modern people's cultural life. The most traditional wooden pencils are erasable at any time. Therefore, in the fields of sketching, drawing, examinations, makeup, etc., wooden pencils are still the main tools and have an irreplaceable position.

[0003] Currently, in order to protect wooden pencils and improve their appearance, they are coated with paint. However, because the barrel of wooden pencils is made of a relatively hard material, people's fingers are prone to indentations after using wooden pencils for a long time. Summary of the Invention

[0004] In order to improve the comfort of using a pencil, the present application provides a rubber paint and a preparation method thereof.

[0005] In a first aspect, the present application provides a rubber paint, which adopts the following technical solution:

[0006] A rubber paint comprising component A;

[0007] The A component is made of the following raw materials in percentage by weight:

[0008] Polyurethane 39.26-51.38%;

[0009] Isocyanate curing agent 5.27-7.69%;

[0010] n-Butanol 19.58-36.73%;

[0011] Elastic powder 7.28-11.26%;

[0012] Leveling agent 2.02-4.26%;

[0013] Matte powder 5.37-8.25%.

[0014] By adopting the above technical solution, after mixing raw materials such as polyurethane, elastic powder, n-butanol, and isocyanate curing agent, the isocyanate curing agent reacts with the polyurethane at a certain temperature to solidify into a film. On the one hand, because polyurethane contains repeating carbamates and flexible groups such as ethers and esters, the rubber paint is sprayed on the surface of the pencil. After the rubber paint cures, it can form a soft and elastic paint film, which improves the pencil's feel and effectively alleviates the indentation caused by long-term pencil use. On the other hand, the elastic powder is a powder composed of elastic polymer microspheres and has rubber elasticity. Adding the elastic powder further improves the elasticity of the paint film after the rubber paint cures. At the same time, n-butanol has good miscibility with polyurethane, which can lower the glass transition temperature of polyurethane, increase the flexibility of the paint film, further improve the pencil's feel, and reduce the occurrence of indentation caused by fingers.

[0015] Preferably, the A component is made of the following raw materials in the following weight percentages:

[0016] Polyurethane 50.38%;

[0017] Isocyanate curing agent 5.52-6.38%;

[0018] n-Butanol 52.27-25.38%;

[0019] Elastic powder 10.36-10.38%;

[0020] Leveling agent 2.02-2.16%;

[0021] Matte powder 5.59-6.18%.

[0022] By adopting the above technical solution, the addition amount of raw materials such as polyurethane, isocyanate curing agent, n-butanol and elastic powder is further optimized, and the reaction forms a polyurethane containing an appropriate amount of flexible segments and rigid segments. The paint film formed after curing not only has a soft and thick feel, but also has good strength.

[0023] Preferably, the elastic powder is modified polyurethane elastic powder with a solid content of 99±1 and a density of 1.05 g / cm 3 , the pH value of 10% solution is 6.5-7.5.

[0024] By adopting the above technical solution, the modified polyurethane elastic powder does not contain wax and has good compatibility with components such as polyurethane and n-butanol. It can not only improve the soft and fleshy feel of the paint film, but also improve the wear resistance and scratch resistance of the paint film.

[0025] Preferably, the rubber paint further comprises component B;

[0026] The B component is composed of the following components in percentage by weight:

[0027] Acrylic acid modified polyester resin 35-65%;

[0028] Fluorinated polyurethane acrylate 35-65%.

[0029] By adopting the above technical solution, both the acrylic modified polyester resin and the fluorinated polyurethane acrylate contain polar groups such as carboxyl and ester groups, which not only have strong adhesion and good flexibility, but also have high cohesion and high wear resistance. Therefore, after the acrylic modified polyester resin, the fluorinated polyurethane acrylate and the A component are mixed according to the above weight ratio, the resulting rubber paint has high adhesion, and the paint film formed by curing has a soft, fleshy and thick feel, as well as high wear resistance. At the same time, polyurethane acrylate has excellent wear resistance, adhesion and flexibility due to the combination of the advantages of polyacrylate and polyurethane. Therefore, introducing a hydrophobic fluorine group into the polyurethane acrylate can reduce the surface energy of the paint film, which is conducive to improving the anti-fouling ability of the paint film.

[0030] Preferably, the B component is composed of the following components in percentage by weight:

[0031] Acrylic acid modified polyester resin 45-55%;

[0032] Fluorinated polyurethane acrylate 45-55%.

[0033] By adopting the above technical solution, the content of acrylic modified polyester resin and fluorinated polyurethane acrylate in component B is further optimized, and finally cured to form a paint film with a soft, fleshy and thick feel, as well as good wear resistance and anti-fouling properties.

[0034] Preferably, the acrylic modified polyester resin has a hydroxyl value of 110-180 mgKOH / g and a viscosity of 1100-6500 cps.

[0035] By adopting the above technical solution, the above acrylic modified polyester resin has a lower viscosity, good compatibility with the fluorine-containing polyurethane acrylate and the components of component A, can be cured to form a paint film with good density, and further improve the wear resistance of the paint film.

[0036] Preferably, the fluorine-containing polyurethane acrylate is fluorine-containing polyurethane acrylate UA-5077 or fluorine-containing polyurethane acrylate UV-5016.

[0037] By adopting the above technical solution, the rubber paint composed of the above-mentioned brand of fluorinated polyurethane acrylate, which has medium functionality and 50% active ingredients, and components such as acrylic modified polyester resin, not only has a silky and delicate touch after curing, but also has good anti-fouling properties.

[0038] Preferably, the weight ratio of component A to component B is 1:(0.3-0.6).

[0039] By adopting the above technical solution and controlling the addition amounts of component A and component B, the obtained rubber paint has strong adhesion, and after curing, the paint film has a strong texture and good wear resistance and anti-fouling properties.

[0040] In a second aspect, the present application provides a method for preparing a rubber paint, which adopts the following technical solution:

[0041] A method for preparing a rubber paint comprises the following steps:

[0042] After polyurethane, n-butanol, elastic powder, leveling agent and matte powder are stirred and mixed, isocyanate curing agent is added, and the mixture is stirred and mixed to obtain rubber paint.

[0043] Preferably, the preparation method of the rubber paint comprises the following steps:

[0044] Polyurethane, acrylic modified polyester resin, fluorine-containing polyurethane acrylate, n-butanol, elastic powder, leveling agent and matte powder are stirred and mixed, and then isocyanate curing agent is added and stirred and mixed to obtain rubber paint.

[0045] By adopting the above technical solution, the preparation method of the rubber paint of the present application has a simple process and simple operation steps. It only requires simple mixing of the raw materials to obtain a rubber paint with high adhesion, fine feel, good wear resistance and good anti-fouling properties, which is suitable for large-scale production.

[0046] In summary, this application has the following beneficial effects:

[0047] 1. Since the present application adopts polyurethane containing flexible groups as the main film-forming resin, and adopts and adds elastic powder containing rubber elasticity, after mixing in n-butanol, adding isocyanate curing agent to cure the paint film, the paint film has a soft and elastic feel. When sprayed on a pencil, it can improve the feel of the pencil and effectively relieve the indentation on the fingers after long-term use of the pencil;

[0048] 2. Since the acrylic modified polyester resin and fluorinated polyurethane acrylate in this application contain polar groups such as carboxyl and ester groups, and the fluorinated polyurethane acrylate contains hydrophobic fluorine groups, they can not only improve the adhesion and flexibility of the paint film, but also improve the wear resistance and anti-fouling properties of the paint film;

[0049] 3. The method of the present application is simple in preparation. By mixing and stirring a plurality of components, a rubber paint with excellent performance can be obtained, which is suitable for large-scale production. DETAILED DESCRIPTION

[0050] The present application is further described in detail below with reference to the embodiments.

[0051] Example

[0052] Performance testing

[0053] The rubber paints obtained in the examples and comparative examples of the present application were tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results were as follows:

[0054] Hand feel: After curing, the rubber paints obtained in the examples and comparative examples formed paint films. Ten volunteers were randomly selected to touch the paint films and judge the thickness and smoothness of the paint films. The films were then graded according to the levels in the table below. The level with the most participants was taken as the hand feel of the paint films.

[0055]

[0056] Adhesion test: in accordance with GB / T9286-2021.

[0057] Wear resistance test: Use a dedicated NORMAN RCA abrasion tester (model: 7-IBB) and a dedicated NORMAN paper tape (11 / 16 inch wide × 6) to apply a load of 175g. Rub the paper tape against the surface of the paint film for a specified number of cycles. This test must be conducted in a room with a humidity of 40% to 60%. Store the paper tape at a humidity of 40% ± 5% and a temperature of 24°C ± 2°C. Replace the O-ring at least every three months. After 150 cycles of wear resistance testing, if no substrate is exposed, the paint film passes the test.

[0058] Anti-fouling performance test: Using a ZEBRA oil-based marker (Model: MO-120-MC, fine tip test), hold the marker at a 90° angle to the coating surface. Apply a force of approximately 1-2 N to draw five 5-10 mm lines uniformly from top to bottom. After standing at room temperature for 10 minutes, immediately wipe the surface with alcohol (concentration ≥ 99.5%) at an applied force of 5-8 N. Check for any remaining marks. Test the number of times the same location can be wiped clean until no line can be wiped clean.

[0059] Example 1

[0060] A rubber paint includes component A; the raw materials in component A and their corresponding weights (kg) are shown in the following table.

[0061]

[0062]

[0063] The preparation method of the rubber paint comprises the following preparation steps:

[0064] After mixing polyurethane and n-butanol, stirring and mixing at 550 r / min for 10 minutes, elastic powder, leveling agent and matte powder are added, stirring and mixing at 1500 r / min for 15 minutes, and finally isocyanate curing agent is added, stirring and mixing to obtain rubber paint.

[0065] In the examples of this application, polyurethane, type 7160, was purchased from Wuhan Kamik Technology Co., Ltd.;

[0066] Isocyanate curing agent, brand ZS-1890, purchased from Guangzhou Zengmao Chemical Technology Co., Ltd.

[0067] Elastic powder, brand name Acure D 30F, solid content 99±1, density 1.05g / cm 3 , the pH value of 10% solution is 6.5-7.5, purchased from Shanghai Yuanhe Chemical Co., Ltd.

[0068] Leveling agent, brand k306.

[0069] Examples 2-4

[0070] A rubber paint, which is different from Example 1 in that, in component A, the raw materials and their corresponding weights (kg) are shown in the following table.

[0071]

[0072] The rubber paints obtained in Examples 1-4 were tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0073]

[0074]

[0075] By analyzing the data in the above table, it can be seen that the rubber paints obtained in Examples 1-4 have a thick, smooth and delicate paint film, an adhesion of up to level 1-2, a wear resistance of up to 340-380 times, and an anti-fouling performance of up to 10-15 times. This shows that the rubber paints obtained in Examples 1-4 of the present application have a good feel, high adhesion, and good wear resistance and anti-fouling properties.

[0076] Further analysis of the above table shows that Examples 1 and 2 have higher adhesion, wear resistance, and anti-pollution properties than Examples 3 and 4. This indicates that by optimizing the amount of each raw material component in Component A in the preparation of the rubber paint of this application, the adhesion, wear resistance, and anti-pollution properties of the rubber paint can be improved.

[0077] Example 5

[0078] A rubber paint, which is different from Example 1 in that the elastic powder has a brand name of 5010D, a thermal decomposition temperature of >150°C, a particle size of 10 μm, and is purchased from Xu Yihua Chemical.

[0079] The rubber paint obtained in Example 5 was tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0080]

[0081] By analyzing the data in the above table, it can be seen that the thickness, wear resistance and antifouling performance of Example 5 are all reduced compared with Example 1. This shows that in the total raw materials for preparing the rubber paint of this application, the elastic powder is modified polyurethane elastic powder with a solid content of 99±1 and a density of 1.05g / cm 3 The pH value of 10% solution is 6.5-7.5, and the obtained rubber paint has better feel, wear resistance and anti-pollution performance.

[0082] Examples 6-10

[0083] A rubber paint differs from Example 1 in that it further comprises a component B, and the weight ratio of component A to component B is 1:0.45.

[0084] In component B, the raw materials and their corresponding weight (kg) are shown in the following table.

[0085]

[0086] In Examples 6-10 of the present application, the acrylic acid-modified polyester resin has a hydroxyl value of 180 mgKOH / g and a viscosity of 3500-6500 cps, and is purchased from Guangzhou Shanghe New Material Technology Co., Ltd.

[0087] The fluorinated polyurethane acrylate was fluorinated polyurethane acrylate 5077, which was purchased from JST.

[0088] The preparation method of the rubber paint comprises the following preparation steps:

[0089] After mixing polyurethane and n-butanol, stir and mix at 550 r / min for 10 minutes, add acrylic modified polyester resin and fluorine-containing polyurethane acrylate, and continue to stir and mix for 10 minutes; then add elastic powder, leveling agent and matte powder, stir and mix at 1500 r / min for 15 minutes, and finally add isocyanate curing agent, stir and mix to obtain rubber paint.

[0090] The rubber paints obtained in Examples 6-10 were tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0091]

[0092] Analysis of the data in the table above shows that the rubber paints obtained in Examples 6-10 have a thick, smooth, and fine finish, with adhesion levels of 0-1, abrasion resistance of 460-550 times, and antifouling performance of 10-15 times. This demonstrates that the addition of component B to the total raw materials used in the preparation of the rubber paint of this application can improve the feel, adhesion, abrasion resistance, and antifouling performance of the rubber paint.

[0093] Further analysis of the table above shows that Examples 6-8 have higher adhesion, wear resistance, and anti-pollution properties compared to Examples 9 and 10. This indicates that by optimizing the amount of each raw material component in Component B in the preparation of the rubber paint of this application, the adhesion, wear resistance, and anti-pollution properties of the rubber paint can be improved.

[0094] Example 11

[0095] A rubber paint, which is different from Example 6 in that the weight ratio of component A to component B is 1:0.3.

[0096] In component B, the raw materials and their corresponding weight (kg) are shown in the following table.

[0097]

[0098] Example 12

[0099] A rubber paint, which is different from Example 6 in that the weight ratio of component A to component B is 1:0.6.

[0100] In component B, the raw materials and their corresponding weight (kg) are shown in the following table.

[0101]

[0102] The rubber paints obtained in Examples 11-12 were tested for hand feel, adhesion, wear resistance, and anti-fouling properties. The test results are shown in the following table.

[0103]

[0104]

[0105] Analysis of the data in the table above shows that, while the feel and adhesion of Examples 11 and 12 did not change much compared to Example 6, their abrasion resistance and antifouling properties were significantly reduced. This indicates that, in the preparation of the rubber paint of this application, a weight ratio of Component A to Component B of 1:0.45 can improve the abrasion resistance and antifouling properties of the rubber paint.

[0106] Example 13

[0107] A rubber paint, which is different from Example 6 in that, in component B, the acrylic modified polyester resin has a hydroxyl value of 100-140 mgKOH / g and a viscosity of 1100-1200 cps, and is purchased from Cansen Chemical New Materials (Shenzhen) Co., Ltd.

[0108] Example 14

[0109] A rubber paint, which is different from Example 6 in that, in component B, the fluorine-containing polyurethane acrylate is fluorine-containing polyurethane acrylate UA-860, which is purchased from JST.

[0110] The rubber paints obtained in Examples 13-14 were tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0111]

[0112] Analysis of the data in the table above shows that Example 13, like Example 6, has a thick, smooth, and delicate feel to the paint film, and also exhibits abrasion resistance of up to 520 times and antifouling performance of up to 25 times. This indicates that when the acrylic-modified polyester resin has a hydroxyl value of 100-180 mgKOH / g and a viscosity of 1100-6500 cps in the total raw materials used in preparing the rubber paint of this application, the resulting rubber paint exhibits a good feel, high adhesion, and excellent abrasion resistance and antifouling properties.

[0113] Compared to Example 6, Example 14 achieved a stain resistance of 29 times, but the texture was slightly less thick, the adhesion was reduced, and the abrasion resistance and stain resistance were significantly reduced. This indicates that when the fluorinated polyurethane acrylate is UA-5077 in the total raw materials used to prepare the rubber paint of the present application, the feel, abrasion resistance, and stain resistance of the rubber paint can be improved.

[0114] Because in this application, when the fluorinated polyurethane acrylate in the rubber paint is fluorinated polyurethane acrylate UV-5016, the performance is similar to that of Example 6. Therefore, in the examples of this application, only fluorinated polyurethane acrylate UA-5077 is briefly described as an example, but this does not affect the application of fluorinated polyurethane acrylate UV-5016 in this application.

[0115] Example 15

[0116] A rubber paint, which differs from Example 8 in that, in component B, an equal weight of polyester-modified acrylic resin SGR-2600 is used to replace the acrylic-modified polyester resin.

[0117] The rubber paint obtained in Example 15 was tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0118]

[0119] Analysis of the data in the table above shows that, compared to Example 6, Example 15 exhibits a slightly less textured feel, a less smooth and fine paint film, decreased adhesion, and significantly reduced abrasion resistance and antifouling properties. This demonstrates that, in the rubber paint of this application, component B, when composed of a mixture of acrylic acid-modified polyester resin and fluorinated polyurethane acrylate, can improve the feel, adhesion, abrasion resistance, and antifouling properties of the rubber paint.

[0120] Comparative Example

[0121] Comparative Example 1-2

[0122] A rubber paint, which is different from Example 1 in that, in component A, the raw materials and their corresponding weights (kg) are shown in the following table.

[0123]

[0124] Comparative Example 3

[0125] A rubber paint differs from Example 1 in that an equal weight of linear polyester resin PR530 is used to replace polyurethane, and dibutyl phthalate is used as an isocyanate curing agent.

[0126] The rubber paints obtained in Comparative Examples 1-3 were tested for hand feel, adhesion, wear resistance and anti-fouling properties. The test results are shown in the following table.

[0127]

[0128] By analyzing the data in the above table, it can be seen that compared with Example 1, Comparative Examples 1 and 2 have poor thickness, poor smoothness and fineness of the paint film, and significantly reduced adhesion, wear resistance and anti-pollution performance. This shows that in the preparation of the rubber paint of this application, component A, which is made by mixing 39.26-51.38% of polyurethane, 5.27-7.69% of isocyanate curing agent, 25.38-36.73% of n-butanol, 7.28-11.26% of elastic powder, 2.02-4.26% of leveling agent, and 5.37-8.25% of matte powder, can improve the feel, adhesion, wear resistance and anti-pollution performance of the rubber paint.

[0129] Compared to Example 1, Comparative Example 3 has a stronger sense of thickness, but the smoothness and fineness of the paint film are poor, and the adhesion, wear resistance, and anti-fouling properties are significantly reduced. This shows that among the total raw materials for preparing the rubber paint of this application, the use of polyurethane as the main film-forming agent in component A can produce a rubber paint with a strong sense of thickness, a smooth and fine paint film, high adhesion, and good wear resistance and anti-fouling properties.

[0130] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A rubber paint, characterized in that: Including component A; The A component is made of the following raw materials in percentage by weight: Polyurethane 39.26-51.38%; Isocyanate curing agent 5.27-7.69%; n-Butanol 19.58-36.73%; elastic powder 7.28-11.26%; Leveling agent 2.02-4.26%; Matte powder 5.37-8.25%; The elastic powder is modified polyurethane elastic powder with a solid content of 99±1 and a density of 1.05g / cm 3 , pH value of 10% solution is 6.5-7.5; Also includes a B component; the B component is composed of the following components in percentage by weight: Acrylic acid modified polyester resin 35-65%; Fluorinated polyurethane acrylate 35-65%; The acrylic acid modified polyester resin has a hydroxyl value of 110-180 mgKOH / g and a viscosity of 1100-6500 cps; The weight ratio of the component A to the component B is 1:(0.3-0.6).

2. The rubber paint according to claim 1, characterized in that The A component is made of the following raw materials in percentage by weight: polyurethane 50.38%; Isocyanate curing agent 5.52-6.38%; n-Butanol 25.27-25.38%; elastic powder 10.36-10.38%; Leveling agent 2.02-2.16%; Matte powder 5.59-6.18%.

3. The rubber paint according to claim 1, characterized in that The fluorine-containing polyurethane acrylate is fluorine-containing polyurethane acrylate UA-5077 or fluorine-containing polyurethane acrylate UV-5016.

4. The method for preparing the rubber paint according to any one of claims 1 to 3, characterized in that: The following steps are involved: Polyurethane, acrylic modified polyester resin, fluorine-containing polyurethane acrylate, n-butanol, elastic powder, leveling agent and matte powder are stirred and mixed, and then isocyanate curing agent is added and stirred and mixed to obtain rubber paint.

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