Coating material for PVC mesh fabric, and preparation method

Abstract

The present application relates to the field of coating materials. Particularly disclosed are a coating material for a PVC mesh fabric, and a preparation method. The coating material comprises the following raw materials in parts by weight: 90-110 parts of PVC resin powder, 25-50 parts of a viscosity modifier, 0.5-1.5 parts of a dispersant, 6.5-8 parts of a plasticizer and 6-12 parts of a processing aid, wherein the viscosity modifier comprises 2-4 parts of base oil, 1-3 parts of petroleum sulfonate, 1-2 parts of an amino acid and 15-25 parts of a filler. The preparation method comprises the following steps: dissolving the PVC resin powder in a solvent to form a paste to obtain a PVC paste; uniformly stirring the filler and the base oil by means of coupling ultrasonic and mechanical stirring, adding petroleum sodium sulfonate and the amino acid, and uniformly mixing same to obtain the viscosity modifier; and uniformly stirring and mixing the PVC paste, the viscosity modifier, the dispersant, the plasticizer and the processing aid. The prepared coating material has excellent fluidity such that surfaces of mesh fabrics can be uniformly coated with same, and the coating material has good adhesiveness with the mesh fabrics.

Description

Coating material for PVC mesh cloth and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the field of coating materials, more particularly, it relates to a coating material for PVC mesh cloth and a preparation method thereof. BACKGROUND

[0002] PVC mesh cloth is a mesh material made of polyvinyl chloride (PVC), and the organization density is relatively sparse. There are holes and gaps between the yarns. It has the characteristics of lightness, softness, durability, waterproofness and corrosion resistance, and is widely used in sunshade materials, decorative materials and guardrail materials.

[0003] In order to enhance the overall strength of the mesh cloth, a layer of coating material is usually coated on the surface of the mesh cloth. However, the coating material on the market is not easy to uniformly coat the mesh cloth, and after the coating material is formed, the holes of the mesh cloth are usually blocked, which affects the use of the mesh cloth. SUMMARY

[0004] The present application provides a coating material for PVC mesh cloth and a preparation method thereof. The prepared coating material has excellent fluidity and can be uniformly coated on the surface of the mesh cloth. The adhesion between the coating material and the mesh cloth is good, which can neither block the holes of the mesh cloth nor adhere to the surface of the mesh cloth to enhance the overall strength of the mesh cloth.

[0005] The coating material for PVC mesh cloth provided by the present application adopts the following technical scheme:

[0006] A coating material for PVC mesh cloth, wherein the total weight fraction of the coating material is calculated, and the coating material comprises the following raw materials in weight fraction: PVC resin powder 90-110 parts, viscosity modifier 25-50 parts, dispersing agent 0.5-1.5 parts, plasticizer 6.5-8 parts, and processing aid 6-12 parts.

[0007] The total weight fraction of the viscosity modifier is calculated, and the viscosity modifier comprises base oil 2-4 parts, petroleum sulfonate 1-3 parts, amino acid 1-2 parts and filler 15-25 parts.

[0008] Further, the plasticizer is diisononyl phthalate.

[0009] By adopting the above technical scheme, PVC resin powder is selected as the main material, which has excellent compatibility with the mesh cloth and excellent adhesion. The viscosity modifier can effectively adjust the viscosity of the material and improve the fluidity of the material, so that it is easier to coat on the surface of the mesh cloth. At the same time, the adhesion between the material and the mesh cloth can be ensured, so that a uniform coating is formed. The dispersing agent can uniformly disperse each component and prevent aggregation and precipitation. In cooperation with the viscosity modifier, the fluidity and stability of the material are improved.

[0010] The petroleum sulfonate not only improves the wettability of the material, but also contains sulfonic acid groups which can form hydrogen bonds with amino groups, carboxyl groups and hydroxyl groups in the material, introduce steric hindrance effect in the molecular structure, maintain stability, increase the spacing between molecules, reduce the interaction between molecules and improve the flowability of the components. The base oil in combination with the filler not only plays a certain lubricating role to improve the flowability of the material, but also enhances the adhesion between the material and the substrate.

[0011] The plasticizer can improve the softness and ductility of the coating, enhance its tensile resistance, reduce the cracking of the coating, and also assist in improving the adhesion between the coating and the substrate, so that the coating can be firmly attached to the surface of the substrate. The processing aid can further improve the processability of the material, adjust the stability of the material and improve the weather resistance of the coating.

[0012] Preferably, the base oil includes one of soybean oil, hydrogenated oil and palm oil.

[0013] As a further preferred base oil, the base oil is preferably soybean oil or hydrogenated oil.

[0014] By adopting the above technical solution, the base oil helps to improve the softness and ductility of the material, improve its processability, and to a certain extent, control the viscosity of the material, making it easier to be uniformly coated on the surface of the mesh cloth.

[0015] Preferably, the dispersant is a polyoxyethylene ether.

[0016] Further, the polyoxyethylene ether includes fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether, and specifically, dodecyl polyoxyethylene ether is preferred.

[0017] By adopting the above technical solution, the polyoxyethylene ether is an excellent surfactant which can assist the uniform dispersion of PVC resin powder, prevent particle agglomeration, and improve the uniformity and stability of the material.

[0018] Preferably, the amino acid includes at least one of lysine, glutamic acid and phenylalanine.

[0019] Preferably, the amino acid is a mixture of lysine, glutamic acid and phenylalanine, and the mass ratio of the lysine, glutamic acid and phenylalanine is 1:(0.5-1)(0.3-0.8).

[0020] By adopting the above technical solution, lysine, glutamic acid and phenylalanine play a good viscosity adjusting role, cooperate with sodium petroleum sulfonate to improve the flowability of the material, which is conducive to better coating of the coating material on the surface of the mesh cloth, and also can ensure the adhesion between the material and the substrate.

[0021] Preferably, the processing aid includes 3-6 parts of stabilizer, 1-2 parts of antioxidant, and 2-4 parts of mildew-proof agent, based on the total weight parts of the coating material.

[0022] Further, the stabilizer is preferably a barium-zinc stabilizer, the antioxidant is antioxidant 1010 or antioxidant 2246, and the mildew-proof agent is 1,2-benzisoxazol-3-one.

[0023] By adopting the above technical solution, the appropriate processing aid is selected, and the comprehensive quality of the coating material is further improved.

[0024] Preferably, the filler includes at least one of fumed silica, calcium carbonate, and talc powder.

[0025] By adopting the above technical solution, the fumed silica has a large specific surface area and pore structure, can effectively absorb liquid and form stable gel-like substances to adjust the viscosity and consistency of the material, and at the same time improve the rheological properties, so that it is easier to adhere to the surface of the material and form a uniform coating. The calcium carbonate has low cost, fine particles and large specific surface area, is filled between the resin powder particles, forms a network structure in coating, and improves the adhesion of the material to the substrate. The talc powder not only improves the coating performance and adhesion of the material, so that the coating material is more easily formed into a uniform coating on the mesh cloth surface, but also has certain heat insulation and flame retardant properties, which can improve the flame retardancy of the mesh cloth to a certain extent.

[0026] In a second aspect, the application provides a preparation method of a coating material for PVC mesh cloth, which adopts the following technical solution:

[0027] A preparation method of a coating material for PVC mesh cloth includes the following steps:

[0028] The PVC resin powder is dissolved in the solvent to form a paste to obtain a PVC paste, and the mass ratio of the PVC resin powder to the solvent is 1:(1-2);

[0029] The filler and the base oil are uniformly mixed by ultrasonic coupling and mechanical stirring, and the petroleum sodium sulfonate and the amino acid are uniformly mixed to obtain a viscosity regulator;

[0030] The PVC paste, the viscosity regulator, the dispersing agent, the plasticizer, and the processing aid are uniformly stirred and mixed to obtain the coating material.

[0031] By adopting the technical scheme, the PVC resin powder is dissolved into paste by using the solvent, the paste-shaped PVC resin has good adhesion, the filler and the base oil are coupled by ultrasonic and mechanically stirred, the base oil and the filler can be fully contacted, and the rheological property of the viscosity regulator can be good by cooperation of the petroleum sodium sulfonate and the amino acid, the flowability of the material can be effectively adjusted after the PVC paste, the viscosity regulator, the dispersant, the plasticizer and the processing aid are uniformly mixed, and the good adhesion can be ensured.

[0032] Preferably, the solvent is one of acetone, toluene and xylene.

[0033] Further, the solvent is preferably acetone, which is widely available, low in cost and good in solubility to the PVC resin powder.

[0034] Preferably, the ultrasonic condition is that the ultrasonic power is 160-220 W, the ultrasonic frequency is 100-200 kHz and the mechanical stirring speed is 800-1200 rpm.

[0035] By adopting the technical scheme, the ultrasonic condition and the stirring speed are optimized, which is beneficial to the uniform dispersion of the components and the comprehensive quality of the coating material is better.

[0036] In summary, the application has the following beneficial effects:

[0037] 1. The petroleum sulfonate can improve the wetting property of the material, and contains sulfonic acid groups, which can form hydrogen bonds with the amino groups, carboxyl groups and hydroxyl groups in the material, introduce steric hindrance effect in the molecular structure, maintain stability, increase the spacing between molecules, reduce the interaction between molecules and improve the flowability of the components. The base oil and the filler can not only play a certain lubricating effect and improve the flowability of the material, but also enhance the adhesion between the material and the substrate.

[0038] 2. The PVC resin powder is selected as the main material, which has excellent compatibility with the mesh cloth and excellent adhesion, the viscosity regulator can effectively adjust the viscosity of the material, improve the flowability of the material, make it easier to coat on the surface of the mesh cloth, and ensure the adhesion between the material and the mesh cloth, so that a uniform coating is formed, the dispersant can uniformly disperse the components and prevent aggregation and precipitation, and the viscosity regulator can improve the flowability and stability of the material. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 is a sample diagram of the coating material of the mesh cloth coated in Example 6.

[0040] Fig. 2 is a sample diagram of the coating material of the mesh cloth coated in Comparative Example 1. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application, the specific conditions not noted in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer, and the reagents or instruments not noted by the manufacturer are all conventional products that can be purchased on the market. Among them: the alkyl phenol polyoxyethylene ether has a CAS number of 9002-93-1, and the barium-zinc stabilizer is purchased from Wuxi Handerson Chemical Co., Ltd., model 105-48, and the particle size of the filler is micron level.

[0042] Embodiment

[0043] Embodiment 1

[0044] A coating material for PVC mesh cloth, comprising the following raw materials: PVC resin powder 9 kg, viscosity modifier 2.5 kg, dispersant 0.05 kg, plasticizer 0.65 kg, processing aid 0.6 kg;

[0045] The plasticizer is diisononyl phthalate; the dispersant is alkyl phenol polyoxyethylene ether with a CAS number of 9002-93-1; the processing aid includes barium-zinc stabilizer 0.3 kg, 1010 antioxidant 0.1 kg, and mildewproof agent 1,2-benzisoxazol-3-one 0.2 kg;

[0046] The viscosity modifier includes base oil 0.2 kg, petroleum sulfonate sodium 0.1 kg, amino acid 0.2 kg, and filler 1.5 kg; the base oil is soybean oil, the amino acid is lysine, and the filler is calcium carbonate.

[0047] The preparation method of the coating material for PVC mesh cloth comprises the following steps:

[0048] The PVC resin powder is dissolved in the solvent to form a paste to obtain a PVC paste, and the mass ratio of the PVC resin powder to the solvent is 1:2, and the solvent is acetone;

[0049] The filler and the base oil are uniformly mixed by ultrasonic coupling and mechanical stirring, and the petroleum sulfonate sodium and the amino acid are uniformly mixed to obtain the viscosity modifier; the ultrasonic power is 160 W, the ultrasonic frequency is 100 kHz, and the mechanical stirring speed is 1200 rpm;

[0050] The PVC paste, the viscosity modifier, the dispersant, the plasticizer, and the processing aid are uniformly stirred and mixed to obtain the coating material.

[0051] Embodiment 2

[0052] A coating material for PVC mesh cloth, comprising the following raw materials: PVC resin powder 11 kg, viscosity modifier 5 kg, dispersant 0.15 kg, plasticizer 0.8 kg, and processing aid 1.2 kg;

[0053] The plasticizer is diisononyl phthalate; the dispersant is alkyl phenol polyoxyethylene ether with CAS number 9002-93-1; the processing aid includes barium zinc stabilizer 0.6 kg, 2246 antioxidant 0.2 kg, and mildewproof agent 1,2-benzisoxazol-3-one 0.4 kg.

[0054] The viscosity modifier includes base oil 0.4 kg, petroleum sulfonate sodium 0.3 kg, amino acid 0.1 kg, and filler 2.5 kg; the base oil is palm oil, the amino acid is lysine and glutamic acid with a mass ratio of 1:1, and the filler is calcium carbonate.

[0055] Example 3

[0056] The difference from Example 1 is that the coating material for the PVC mesh includes the following raw materials: PVC resin powder 10 kg, viscosity modifier 3.5 kg, dispersant 0.1 kg, plasticizer 0.7 kg, and processing aid 0.9 kg.

[0057] The plasticizer is diisononyl phthalate; the dispersant is dodecyl polyoxyethylene ether; the processing aid includes barium zinc stabilizer 0.45 kg, 2246 antioxidant 0.15 kg, and mildewproof agent 1,2-benzisoxazol-3-one 0.3 kg.

[0058] The rest are the same as Example 1.

[0059] Example 4

[0060] The difference from Example 3 is that the viscosity modifier includes base oil 0.35 kg, petroleum sulfonate sodium 0.2 kg, amino acid 0.18 kg, and filler 2 kg; the rest are the same as Example 3.

[0061] Example 5

[0062] The difference from Example 4 is that the base oil is hydrogenated oil, the filler is fumed silica and talc powder with a mass ratio of 1:1, and the amino acid is glutamic acid and phenylalanine with a mass ratio of 0.5:0.3; the rest are the same as Example 4.

[0063] Example 6

[0064] The difference from Example 5 is that the base oil is soybean oil, the filler is fumed silica and talc powder and calcium carbonate with a mass ratio of 1:1:2, and the amino acid is lysine and glutamic acid with a mass ratio of 1:1:0.8; the rest are the same as Example 5.

[0065] Example 7

[0066] The difference from Example 6 is that the preparation method of the coating material for the PVC mesh includes the following steps:

[0067] The PVC resin powder is dissolved in the solvent to form a paste to obtain a PVC paste, the mass ratio of the PVC resin powder to the solvent is 1:1, and the solvent is toluene;

[0068] The filler and the base oil are uniformly mixed by ultrasonic coupling and mechanical stirring, and the petroleum sulfonic acid sodium and the amino acid are added and uniformly mixed to obtain the viscosity adjusting agent; the ultrasonic power is 220 W, the ultrasonic frequency is 200 kHz, and the mechanical stirring speed is 800 rpm;

[0069] The PVC paste, the viscosity adjusting agent, the dispersing agent, the plasticizer and the processing aid are uniformly stirred and mixed to obtain the coating material;

[0070] The rest are the same as those in Example 6.

[0071] Comparative Example

[0072] Comparative Example 1

[0073] The difference from Example 6 is that the petroleum sulfonic acid sodium is not added, and the rest are the same as those in Example 6.

[0074] Comparative Example 2

[0075] The difference from Example 6 is that the amino acid is replaced by an equal amount of calcium carbonate powder, and the rest are the same as those in Example 6.

[0076] Comparative Example 3

[0077] The difference from Example 6 is that the addition amount of the viscosity adjusting agent is 6.5 kg, and the rest are the same as those in Example 6.

[0078] Comparative Example 4

[0079] The difference from Example 6 is that the addition amount of the viscosity adjusting agent is 1 kg, and the rest are the same as those in Example 6.

[0080] Performance detection test

[0081] The same size of the mesh cloth is taken, the coating materials prepared in Example 6 and Comparative Example 1 are coated by horizontal brushing, and then dried at a constant temperature of 37℃, and the sample diagram of the mesh cloth is recorded, as shown in FIG. 1 and FIG. 2 respectively.

[0082] A funnel is used for flow rate test, the funnel specifications are: upper end diameter 100 mm, bottom end diameter 10 mm, and height 50 mm.

[0083] The test procedure is as follows: after the funnel is washed clean and dried, it is placed on the bench so that its top surface is horizontal, the body is vertical, and it is ensured that the funnel is stable, the funnel flow outlet is closed, the corresponding coating material is poured into the funnel, the material top surface is scraped flat along the upper end of the funnel with a scraper, after standing for 10±2 s, the funnel flow outlet is quickly opened, and the time from the moment the funnel flow outlet is opened to the time when the coating material in the funnel is completely emptied is recorded with a stopwatch. Three parallel tests are performed on each sample, and the average of the three test results is taken as the test result, which is accurate to 0.1 s. Each result is recorded in Table 1.

[0084] Table 1

[0085] It can be seen from Examples 1-7 in combination with Table 1 that the coating material obtained by the present application has excellent flowability, can be uniformly coated on the surface of the scrim, and has good adhesion between the coating material and the scrim, neither blocking the holes of the scrim nor adhering to the surface of the scrim to enhance the overall strength of the scrim.

[0086] It can be seen from Example 6 and Comparative Example 1 in combination with Table 1 that the flowability of the coating material in Comparative Example 1 is poor due to the lack of sodium petroleum sulfonate. As can be clearly seen from Figures 1 and 2, the coating material prepared by using the coating material of Example 6 has clear holes, no blocking, uniform coating, and good adhesion between the coating material and the scrim, while the coating material of Comparative Example 1 has unsuitable viscosity and poor flowability, resulting in a little blocking of the scrim and some uneven coating.

[0087] Therefore, it can be seen from Examples 6 and Comparative Examples 1-4 in combination with Table 1 that whether the component of the tackifier is adjusted or the amount of the tackifier in the coating material is adjusted, the flowability of the coating material is obviously poor, the viscosity of the material is poor, and the quality of the obtained scrim is also obviously decreased. This is because

[0088] The petroleum sulfonate not only can improve the wetting property of the material, but also contains sulfonic acid groups, which can form hydrogen bonds with amino groups, carboxyl groups and hydroxyl groups in the material, introduce steric hindrance effect in the molecular structure, maintain stability, increase the spacing between molecules, reduce the interaction force between molecules and improve the flowability of the components. The base oil cooperates with the filler to not only play a certain lubricating effect, improve the flowability of the material, but also enhance the adhesion between the material and the base material. The PVC resin powder is selected as the main material, which has excellent compatibility with the mesh cloth and excellent adhesion. The viscosity adjusting agent of the application can effectively adjust the viscosity of the material, improve the flowability of the material, make it easier to coat on the surface of the mesh cloth, and at the same time ensure the adhesion between the material and the mesh cloth, so that a uniform coating is formed. The dispersant can make each component disperse uniformly, prevent aggregation and precipitation, cooperate with the viscosity adjusting agent, and improve the flowability and stability of the material. Therefore, the raw material components of the application cooperate with each other, complement each other, and form a coating material with excellent flowability, which can be uniformly coated on the surface of the mesh cloth, has good adhesion with the mesh cloth, does not block the pores of the mesh cloth, and can be attached to the surface of the mesh cloth to enhance the overall strength of the mesh cloth.

[0089] The specific embodiments are only an explanation of the application, and are not a limitation of the application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the application and are protected by the patent law.

Claims

1. A coating material for PVC mesh cloth, characterized in that: Based on the total weight of the coating material, the coating material comprises the following raw materials in parts by weight: 90-110 parts of PVC resin powder, 25-50 parts of viscosity adjusting agent, 0.5-1.5 parts of dispersant, 6.5-8 parts of plasticizer, and 6-12 parts of processing aid; Based on the total weight of the viscosity adjusting agent, the viscosity adjusting agent includes 2-4 parts of base oil, 1-3 parts of petroleum sulfonate, 1-2 parts of amino acid and 15-25 parts of filler.

2. The coating material for PVC mesh cloth according to claim 1, characterized in that: The base oil includes one of soybean oil, hydrogenated oil and palm oil.

3. The coating material for PVC mesh cloth according to claim 1, characterized in that: The dispersant is polyoxyethylene ether.

4. The coating material for PVC mesh cloth according to claim 1, characterized in that: The amino acid includes at least one of lysine, glutamic acid and phenylalanine.

5. The coating material for PVC mesh cloth according to claim 4, characterized in that: The amino acid is a mixture of lysine, glutamic acid and phenylalanine, and the mass ratio of the lysine, glutamic acid and phenylalanine is 1:(0.5-1)(0.3-0.8).

6. The coating material for PVC mesh cloth according to any one of claims 1 to 5, characterized in that: Based on the total weight of the coating material, the processing aid includes 3-6 parts of a stabilizer, 1-2 parts of an antioxidant, and 2-4 parts of a mildew preventer.

7. The coating material for PVC mesh cloth according to claim 6, characterized in that: The filler includes at least one of fumed silica, calcium carbonate, and talc.

8. A method for preparing a coating material for PVC mesh cloth according to any one of claims 1 to 7, characterized in that: The following steps are involved: Dissolving PVC resin powder in a solvent to form a paste to obtain a PVC paste, wherein the mass ratio of the PVC resin powder to the solvent is 1:(1-2); The filler and the base oil are uniformly stirred by an ultrasonic coupling machine, and sodium petroleum sulfonate and amino acid are added and mixed uniformly to obtain a viscosity adjusting agent; The PVC paste is stirred and mixed evenly with a viscosity adjusting agent, a dispersant, a plasticizer and a processing aid to obtain a coating material.

9. The method for preparing a coating material for PVC mesh cloth according to claim 8, characterized in that: The solvent is one of acetone, toluene and xylene.

10. The method for preparing a coating material for PVC mesh cloth according to claim 8, wherein: The ultrasonic conditions are as follows: ultrasonic power of 160-220 W, ultrasonic frequency of 100-200 kHz, and mechanical stirring speed of 800-1200 rpm.

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