Antistatic PVC coating material for surface treatment and preparation method therefor

Abstract

The present application relates to the field of antistatic coating materials, and particularly to an antistatic PVC coating material for surface treatment and a preparation method therefor. The antistatic PVC coating material for surface treatment comprises the following raw materials in percentage by weight: 30-45% of a polyvinyl alcohol solution, 4-9% of a filler, 0.1-0.3% of a coupling agent and the balance being an antistatic treating agent. The antistatic treating agent comprises lithium trifluoromethanesulfonimide, cellulose acetate and a reinforcing agent. The preparation method therefor comprises the following steps: preparing an antistatic treating agent, which involves: dissolving lithium trifluoromethanesulfonimide and cellulose acetate in a solvent, then adding the reinforcing agent, and uniformly mixing same to obtain the antistatic treating agent; and blending, which involves: uniformly mixing the polyvinyl alcohol solution, the filler, the coupling agent and the antistatic treating agent. The prepared coating material can be used for directly applying to the surface of a PVC material product to form a transparent film with a permanent antistatic effect, and is suitable for PVC material products of all colors.

Description

Antistatic PVC coating material for surface treatment and preparation method Technical Field

[0001] The present application relates to the field of antistatic coating materials, and more specifically, to an antistatic PVC coating material for surface treatment and a preparation method thereof. Background Art

[0002] At present, traditional PVC materials used in special materials such as coal mine ventilation pipes, protective covers and rolling doors require antistatic treatment for the following reasons:

[0003] 1. Prevent static electricity accumulation: In special environments such as coal mines, there is a risk of static electricity accumulation. Static electricity can cause fires and explosions, posing a threat to the safety of personnel and equipment. By applying antistatic treatment to PVC materials, the accumulation of static electricity can be effectively prevented, reducing the risk of static fires and explosions.

[0004] 2. Protecting personnel safety: Special materials such as coal mine ventilation ducts, protective covers, and rolling shutters are often used inside mines or in environments where they come into contact with flammable gases. These materials are prone to generating static electricity. When used in high-risk environments, contact with these materials can cause static discharge, potentially leading to accidents. Antistatic treatment can reduce this risk and improve personnel safety.

[0005] 3. Protect equipment integrity: Some equipment is very sensitive to static electricity during operation, and electrostatic discharge may cause damage or interference to the equipment. By using anti-static treated PVC materials in special materials, the impact of electrostatic discharge on the equipment can be reduced, protecting the integrity and normal operation of the equipment.

[0006] 4. Improve work efficiency: Special materials such as protective covers and rolling shutters need to be frequently opened, closed, and moved. Without antistatic treatment, static electricity may cause adhesion between materials, making operation difficult and reducing work efficiency. Antistatic treatment can reduce this phenomenon and improve work efficiency.

[0007] In order to achieve the above effects, conductive carbon black and carbon nanotubes are usually added to the PVC formula. Conductive carbon black and carbon nanotubes are easy to agglomerate and difficult to disperse in the material, and can only be used for dark or black PVC material products. In order to solve the problems of material dispersion and material color, liquid antistatic agents are often added. However, pinholes are often found on the surface of PVC material products in the actual production process, which affects their service life. Summary of the Invention

[0008] The present application provides an antistatic PVC coating material for surface treatment and a preparation method. The prepared coating material can be directly coated on the surface of PVC material products to form a transparent film with a permanent antistatic effect. The coating material is suitable for PVC material products of all colors, effectively solves the problem of pinholes appearing on the material surface, and also has good tear resistance, which can play a certain protective role for PVC material products.

[0009] In the first aspect, the present application provides an antistatic PVC coating material for surface treatment using the following technical solution:

[0010] An antistatic PVC coating material for surface treatment comprises the following raw materials in weight percentage: 30-45% polyvinyl alcohol solution, 4-9% filler, 0.1-0.3% coupling agent, and the balance antistatic treatment agent;

[0011] The antistatic treatment agent comprises lithium trifluoromethylsulfonyl imide, cellulose acetate and a reinforcing agent.

[0012] By adopting the above technical solution, lithium trifluoromethylsulfonyl imide and cellulose acetate are selected as the main antistatic components, which gives the coating material excellent antistatic effect. Under the action of the reinforcing agent, the antistatic performance of the product can be further enhanced or improved. The obtained coating material can be directly applied to the surface of PVC material products to form a transparent film with permanent antistatic effect, effectively solving the problem of pinholes on the material surface. It is also suitable for PVC material products of all colors.

[0013] Cellulose acetate itself has a certain antistatic effect. The acetate groups in its molecules can attract and store static charges, preventing their accumulation and release. Polyvinyl alcohol solutions have excellent film-forming and adhesive properties. Cellulose acetate can also increase the viscosity and rheological properties of the coating material, giving it a certain degree of elasticity and enhancing its flexibility after film formation, thereby improving its tear resistance. Fillers can further improve the mechanical properties of the coating material after film formation. Coupling agents can improve the dispersibility of raw material components, better wet the substrate surface, achieve better interfacial compatibility, promote bonding between the coating material and the substrate, and enhance the adhesion of the coating, providing a certain degree of protection for PVC products.

[0014] Preferably, the reinforcing agent is polymethyl methacrylate or polyvinylidene fluoride.

[0015] By employing the above-mentioned technical solution, polymethyl methacrylate can also assist in forming a transparent film with excellent insulating properties, hindering the conduction and release of static electricity, and preventing the generation and accumulation of static electricity. Polyvinylidene fluoride contains polar groups and inherently has low surface resistance, which can promote the rapid release of static charge and reduce static accumulation. When combined with lithium trifluoromethylsulfonyl imide and cellulose acetate, it forms a composite antistatic material, enhancing the antistatic properties of the coating material and ensuring that the resulting transparent film has a permanent antistatic effect.

[0016] Preferably, the addition amount of the lithium trifluoromethylsulfonyl imide is 0.5-5 wt % of the enhancer.

[0017] Preferably, the added amount of the cellulose acetate is 1-3 wt % of the reinforcing agent.

[0018] By adopting the above technical solution, the dosage relationship between lithium trifluoromethylsulfonyl imide, cellulose acetate and the reinforcing agent is optimized, thereby improving the antistatic effect of the coating material.

[0019] Preferably, the mass concentration of the polyvinyl alcohol solution is 15-22%.

[0020] By adopting the above technical solution and selecting a suitable polyvinyl alcohol solution, a uniform and smooth film coating can be achieved, avoiding defects such as uneven coating and bubbles caused by excessively high or low solution concentration, which is beneficial to improving the overall quality of the transparent film, giving the film good flexibility, improving the film's tear resistance, playing a certain protective role on the substrate of PVC material products, and increasing its service life.

[0021] Preferably, the filler includes at least one of nano-silicon dioxide, zinc oxide, and polystyrene sulfonic acid.

[0022] Preferably, the filler is zinc oxide and polystyrene sulfonic acid in a mass ratio of 1:(1-2).

[0023] By adopting the above technical solution, nano-silica, zinc oxide, and polystyrene sulfonic acid can all be used as fillers to enhance the mechanical properties of the film layer. Zinc oxide also has excellent antistatic properties and high transparency, which is beneficial to improving the overall quality of the transparent film. Polystyrene sulfonic acid also has good antistatic properties. Under the action of polyvinyl alcohol solution, a transparent film with even better antistatic effect is formed.

[0024] Preferably, the coupling agent is one of an aminosilane coupling agent, a thiolsilane coupling agent, and a vinylsilane coupling agent.

[0025] Furthermore, as a preferred embodiment of the coupling agent, it is more preferable to use an aminosilane coupling agent or a thiolsilane coupling agent.

[0026] By adopting the above technical solution, the coupling agent can improve the interfacial affinity between the coating material and the substrate. The aminosilane coupling agent contains an amino group and can form a hydrogen bond with the hydroxyl group in the system. The thiol group in the thiolsilane coupling agent forms a hydrogen bond with the sulfonic acid group in the system, further improving the mechanical properties of the transparent film.

[0027] In a second aspect, the present application provides a method for preparing an antistatic PVC coating material for surface treatment, which adopts the following technical solution:

[0028] A method for preparing an antistatic PVC coating material for surface treatment comprises the following steps:

[0029] Preparation of an antistatic treatment agent: dissolving lithium trifluoromethylsulfonyl imide and cellulose acetate in a solvent, and then adding a reinforcing agent and mixing uniformly to obtain an antistatic treatment agent;

[0030] Blending: Mix the polyvinyl alcohol solution, filler, coupling agent and antistatic treatment agent evenly.

[0031] By adopting the above technical solution, the prepared coating material can be directly coated on the surface of PVC material products to form a transparent film with permanent antistatic effect, effectively solving the problem of pinholes appearing on the material surface. It also has good tear resistance and can play a certain protective role for PVC material products. It is also suitable for PVC material products of all colors.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. Lithium trifluoromethylsulfonyl imide and cellulose acetate are selected as the main antistatic components to give the coating material excellent antistatic effect. Under the action of the enhancer, the antistatic performance of the product can be further enhanced or improved. The obtained coating material can be directly applied to the surface of PVC material products to form a transparent film with permanent antistatic effect, effectively solving the problem of pinholes on the material surface. It is also suitable for PVC material products of all colors.

[0034] 2. Polymethyl methacrylate can also help form a transparent film with excellent insulating properties, hindering the conduction and release of static electricity, preventing the generation and accumulation of static electricity. Polyvinylidene fluoride contains polar groups and has low surface resistance, which can promote the rapid release of static charge and reduce the accumulation of static electricity. It forms a composite antistatic material with lithium trifluoromethylsulfonyl imide and cellulose acetate, enhancing the antistatic properties of the coating material, and the resulting transparent film has a permanent antistatic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic diagram of Example 1 of the present application before the surface resistivity test of the front side.

[0036] FIG2 is a schematic diagram of the surface resistivity test of the front side of Example 1 of the present application. DETAILED DESCRIPTION

[0037] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Specific conditions not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0038] Example

[0039] Example 1

[0040] An antistatic PVC coating material for surface treatment comprises the following raw materials in weight percentage: 30% polyvinyl alcohol solution, 4% filler, 0.1% aminosilane coupling agent, and the balance antistatic treatment agent; the mass concentration of the polyvinyl alcohol solution is 22%, and the filler is nano-silicon dioxide;

[0041] The antistatic treatment agent includes lithium trifluoromethylsulfonyl imide, cellulose acetate and a reinforcing agent; the reinforcing agent is polyvinylidene fluoride, wherein the addition amount of lithium trifluoromethylsulfonyl imide is 0.5wt% of the reinforcing agent, and the addition amount of cellulose acetate is 3wt% of the reinforcing agent.

[0042] The preparation method of the antistatic PVC coating material for surface treatment comprises the following steps:

[0043] Preparation of an antistatic treatment agent: dissolving lithium trifluoromethylsulfonyl imide and cellulose acetate in an acetone solution, and then adding a reinforcing agent and mixing uniformly to obtain an antistatic treatment agent;

[0044] Blending: Mix the polyvinyl alcohol solution, filler, coupling agent and antistatic treatment agent evenly.

[0045] Example 2

[0046] An antistatic PVC coating material for surface treatment comprises the following raw materials in weight percentage: 45% polyvinyl alcohol solution, 9% filler, 0.3% vinyl silane coupling agent, and the balance antistatic treatment agent; the mass concentration of the polyvinyl alcohol solution is 15%, and the filler is nano-silicon dioxide, zinc oxide, and polystyrene sulfonic acid in a mass ratio of 1:1:1;

[0047] The antistatic treatment agent includes lithium trifluoromethylsulfonyl imide, cellulose acetate and a reinforcing agent; the reinforcing agent is polyvinylidene fluoride, wherein the addition amount of lithium trifluoromethylsulfonyl imide is 5wt% of the reinforcing agent, and the addition amount of cellulose acetate is 1wt% of the reinforcing agent.

[0048] The preparation method of the antistatic PVC coating material for surface treatment is the same as that in Example 1.

[0049] Example 3

[0050] The difference from Example 1 is that the antistatic PVC coating material for surface treatment includes the following raw materials in weight percentage: 40% polyvinyl alcohol solution, 6% filler, 0.3% aminosilane coupling agent, and the balance antistatic treatment agent; the rest are the same as Example 1.

[0051] Example 4

[0052] The difference from Example 3 is that the mass concentration of the polyvinyl alcohol solution is 19%; the rest is the same as Example 3.

[0053] Example 5

[0054] The difference from Example 4 is that the added amount of lithium trifluoromethylsulfonyl imide is 0.2 wt % of the reinforcing agent, and the added amount of cellulose acetate is 4 wt % of the reinforcing agent; the rest are the same as Example 4.

[0055] Example 6

[0056] The difference from Example 4 is that the added amount of lithium trifluoromethylsulfonyl imide is 2 wt % of the reinforcing agent, and the added amount of cellulose acetate is 1.5 wt % of the reinforcing agent; the rest is the same as Example 4.

[0057] Example 7

[0058] The difference from Example 6 is that the filler is zinc oxide and calcium carbonate in a mass ratio of 1:1, and the rest is the same as Example 6.

[0059] Example 8

[0060] The difference from Example 6 is that the filler is zinc oxide and polystyrene sulfonic acid in a mass ratio of 1:1, and the rest is the same as Example 6.

[0061] Comparative Example

[0062] Comparative Example 1

[0063] The difference from Example 8 is that lithium trifluoromethylsulfonyl imide is not added to the antistatic treatment agent, and the rest is the same as Example 8.

[0064] Comparative Example 2

[0065] The difference from Example 8 is that no reinforcing agent is added to the antistatic treatment agent, and the rest is the same as Example 8.

[0066] Comparative Example 3

[0067] The difference from Example 8 is that the reinforcing agent in the antistatic treatment agent is titanium dioxide, and the rest is the same as Example 8.

[0068] Performance testing

[0069] The coating materials prepared in Examples 1-8 and Comparative Examples 1-3 were evenly coated on the front and back of PVC products from the same batch. Surface resistivity of the front and back surfaces of 5 samples in each group was tested using ASTM D257-14.

[0070] Test conditions:

[0071] Pretreatment conditions: (23 ± 2) °C, (50 ± 5)% RH, 40 h;

[0072] Test conditions: (23±2)℃, (50±5)%R;

[0073] Electrode diameter: D1 = 50 mm, D2 = 60 mm;

[0074] Test voltage: 500Vdc;

[0075] Electrochemical time: 1 min.

[0076] The average value of each group was taken as the result and the results are recorded in Table 1.

[0077] The coating materials obtained in Examples 1-8 and Comparative Examples 1-3 were cast, dried, and peeled to form films. The tear strength test was performed according to ISO 6383-2-2005 "Plastic Film and Sheeting, Determination of Tear Resistance". The results are recorded in Table 1.

[0078] Table 1

[0079] As can be seen from Examples 1-8 and Table 1, the prepared coating material can be directly applied to the surface of a PVC product to form a transparent film with a permanent antistatic effect. The film is suitable for PVC products of all colors and effectively solves the problem of pinholes on the surface of the material. The transparent film also has good tear resistance, can provide a certain degree of protection for PVC products, and increase the service life of PVC products.

[0080] Combining Example 8 with Comparative Examples 1-2 and Table 1, it can be seen that lithium trifluoromethylsulfonyl imide was not added in Comparative Example 1, and no reinforcing agent was added in Comparative Example 2. The antistatic properties of the material were significantly reduced, and the tear resistance of the film formed was also reduced. In Comparative Example 3, the reinforcing agent in the antistatic treatment agent was replaced with titanium dioxide. Although titanium dioxide also has certain antistatic properties, it does not enhance the antistatic effect well, and the antistatic effect only plays a superimposing role. In addition, titanium dioxide is a white powder, and the film formed is turbid and not completely transparent. This is because lithium trifluoromethylsulfonyl imide and cellulose acetate are combined as the main antistatic components. Under the action of the reinforcing agent, they work synergistically to give the coating material an excellent antistatic effect. The resulting coating material is directly applied to the surface of a PVC material product to form a transparent film with a permanent antistatic effect.

[0081] 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. An antistatic PVC coating material for surface treatment, characterized in that: The method comprises the following raw materials in weight percentage: 30-45% polyvinyl alcohol solution, 4-9% filler, 0.1-0.3% coupling agent, and the balance antistatic treatment agent; The antistatic treatment agent comprises lithium trifluoromethylsulfonyl imide, cellulose acetate and a reinforcing agent.

2. The antistatic PVC coating material for surface treatment according to claim 1, characterized in that: The reinforcing agent is polymethyl methacrylate or polyvinylidene fluoride.

3. The antistatic PVC coating material for surface treatment according to claim 2, characterized in that: The addition amount of the lithium trifluoromethylsulfonyl imide is 0.5-5 wt % of the reinforcing agent.

4. The antistatic PVC coating material for surface treatment according to claim 3, characterized in that: The added amount of the cellulose acetate is 1-3 wt % of the reinforcing agent.

5. The antistatic PVC coating material for surface treatment according to claim 1, characterized in that: The mass concentration of the polyvinyl alcohol solution is 15-22%.

6. The antistatic PVC coating material for surface treatment according to claim 1, characterized in that: The filler includes at least one of nano silicon dioxide, zinc oxide, and polystyrene sulfonic acid.

7. The antistatic PVC coating material for surface treatment according to claim 6, characterized in that: The filler is zinc oxide and polystyrene sulfonic acid in a mass ratio of 1:(1-2).

8. The antistatic PVC coating material for surface treatment according to claim 1, characterized in that: The coupling agent is one of an aminosilane coupling agent, a thiolsilane coupling agent, and a vinylsilane coupling agent.

9. A method for preparing an antistatic PVC coating material for surface treatment according to any one of claims 1 to 8, characterized in that: The following steps are involved: Preparation of an antistatic treatment agent: dissolving lithium trifluoromethylsulfonyl imide and cellulose acetate in a solvent, and then adding a reinforcing agent and mixing uniformly to obtain an antistatic treatment agent; Blending: Mix the polyvinyl alcohol solution, filler, coupling agent and antistatic treatment agent evenly.

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