PVC stone chip resistant coating for automobile and preparation method of PVC stone chip resistant coating

Abstract

According to the automobile PVC stone chip resistant coating and the preparation method thereof, due to the addition of the modified calcium carbonate, the coating has excellent elasticity and adhesive force after being cured, so that the stone chip resistance and the corrosion resistance of the coating are improved, and the stone chip resistance and the corrosion resistance of the coating are improved by weakening the acting force between polyvinyl chloride molecules in the modified polyvinyl chloride paste resin through the phthalate; the temperature required for softening is reduced, so that the processability and the flexibility of the coating are improved; the tackifier enhances the cohesive force of the coating and the adhesive force to a base material, and ensures that the coating can be firmly adhered to the surfaces of a vehicle bottom and the like after being applied; the thixotropic agent is an auxiliary agent for improving the rheological property of the coating, and is mainly used for preventing precipitation of pigments and fillers in the storage process of the coating, avoiding splashing and sagging of the coating in the coating process and improving the leveling property of a coating film; the adhesion promoter is used as a chemical substance for enhancing the adhesion between the coating and a base material, so that the binding force between a coating paint film or glue and the base material is enhanced, and the phenomenon of paint peeling or degumming occurring in the coating and gluing process is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of PVC anti-stone chipping coatings, and in particular relates to automotive PVC anti-stone chipping coatings and a preparation method thereof. Background Art

[0002] The underbody of a car is often exposed to abrasive materials like dust, gravel, and stone, as well as corrosion from water, moisture, ice, salt, and acid rain. These factors can easily damage the electrophoretic coating on the coated steel, rendering it ineffective and affecting the car's performance. To prevent this, underbody coatings are used to protect the car body, mitigating the impact of external forces on the underbody and improving the corrosion resistance of the underbody. Spraying thicknesses of 400-1000μm creates a protective layer that can also effectively seal various metal components.

[0003] Traditional PVC anti-stone chip coatings have certain deficiencies in viscosity and adhesion, and traditional coatings may also splash and sag during spraying; therefore, the present invention proposes an automotive PVC anti-stone chip coating and a preparation method thereof to solve the above problems. Summary of the Invention

[0004] The present invention provides an automotive PVC anti-stone chip coating and a preparation method thereof, aiming to solve the problems raised by the background technology.

[0005] The present invention is achieved as follows: a PVC anti-stone chip coating for automobiles comprises a modified polyvinyl chloride paste resin, modified calcium carbonate, phthalate, a tackifier, a diluent, a thixotropic agent, a foaming agent, a heat stabilizer, a pigment and an adhesion promoter, wherein the coating comprises, by weight, 15-20% of modified polyvinyl chloride paste resin, 30-35% of modified calcium carbonate, 30-35% of phthalate, 1.5-2% of tackifier, 1.5-3% of diluent, 1-2% of thixotropic agent, 1-2% of foaming agent, 0.5-1% of heat stabilizer, 0.05-0.2% of pigment and 0.5-1% of adhesion promoter. The above components are mixed and stirred according to weight percentage to obtain the PVC anti-stone chip coating, and the obtained PVC anti-stone chip coating is a viscous paste with a solid content greater than 95%.

[0006] Preferably, the addition of the modified calcium carbonate can make the PVC anti-stone chip coating have excellent elasticity and adhesion after curing, thereby improving the stone chip resistance and corrosion resistance of the PVC anti-stone chip coating.

[0007] Preferably, the phthalate ester reduces the temperature required for softening of the modified polyvinyl chloride paste resin by weakening the intermolecular forces between polyvinyl chloride molecules, thereby improving the processing performance and flexibility of the PVC anti-stone chip coating.

[0008] Preferably, the tackifier enhances the cohesion of the PVC anti-stone chip coating and its adhesion to the substrate, thereby ensuring that the PVC anti-stone chip coating can firmly adhere to the surface such as the bottom of the vehicle after application.

[0009] Preferably, the thixotropic agent is an auxiliary agent used to improve the rheological properties of the PVC anti-stone chip coating. Its main function is to prevent the precipitation of pigments and fillers in the PVC anti-stone chip coating during storage, avoid splashing and sagging of the PVC anti-stone chip coating during coating, and improve the leveling performance of the coating film.

[0010] Preferably, the foaming agent enables the PVC anti-stone chip coating to have increased sound insulation and shock absorption effects of the coating after spraying.

[0011] Preferably, the heat stabilizer is used to prevent the modified polyvinyl chloride paste resin from decomposing during processing and storage.

[0012] Preferably, the adhesion promoter is a chemical substance used to enhance the adhesion between the PVC anti-stone chip coating and the substrate, improve the bonding strength between the coating film or glue and the substrate, and solve the paint peeling or degumming phenomenon that occurs during the coating and gluing process.

[0013] A method for preparing an automotive PVC anti-stone chip coating comprises the following steps:

[0014] S1: preparing a modified polyvinyl chloride paste resin, mixing the polyvinyl chloride paste resin and polyborosiloxane in a mass percentage of (1-30): (70-99) and stirring evenly, then adding a plasticizer and continuing to stir evenly, and finally subjecting the mixture to extrusion, plasticization and calendaring molding processes to obtain the modified polyvinyl chloride paste resin;

[0015] S2: preparing modified calcium carbonate by mixing heavy calcium carbonate powder and stearic acid in a mass ratio of 10:1 in a dry environment, stirring at room temperature -100°C for 30-60 minutes to uniformly mix the mixture, and uniformly dispersing the stearic acid on the surface of the heavy calcium carbonate powder to obtain modified calcium carbonate powder, wherein the mass concentration of stearic acid is 10%-30%;

[0016] S3: Measured by mass percentage, 2% diluent and 35% phthalate are mixed, and then 20% modified polyvinyl chloride paste resin is added and continued to be stirred, and then 35% modified calcium carbonate, 2% tackifier, 2% diluent, 1% thixotropic agent, 1% foaming agent, 1% heat stabilizer, 0.2% pigment, and 0.8% adhesion promoter are added and continued to be stirred, wherein the stirring temperature is room temperature-100°C, the stirring time is 20-30min, and the stirring speed is 1500rpm, and finally the automotive PVC anti-stone chip coating is obtained.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The modified calcium carbonate used in the present invention can make the PVC anti-stone chip coating have excellent elasticity and adhesion after curing, thereby improving the stone chip resistance and corrosion resistance of the PVC anti-stone chip coating.

[0019] 2. The plasticizer used in the present invention is phthalate, which weakens the intermolecular force between polyvinyl chloride molecules in the modified polyvinyl chloride paste resin and reduces the temperature required for its softening, thereby improving the processing performance and flexibility of the PVC anti-stone chip coating;

[0020] 3. The present invention uses a tackifier to enhance the cohesion and adhesion of the PVC anti-stone chip coating to the substrate, thereby ensuring that the PVC anti-stone chip coating can firmly adhere to the surface such as the bottom of the vehicle after application;

[0021] 4. The present invention uses a thixotropic agent as an additive to improve the rheological properties of PVC anti-stone chip coatings. Its main function is to prevent the precipitation of pigments and fillers in the PVC anti-stone chip coatings during storage, avoid splashing and sagging of the PVC anti-stone chip coatings during coating, and improve the leveling performance of the coating film.

[0022] 5. The present invention uses adhesion promoters as chemical substances to enhance the adhesion between PVC anti-stone chip coating and substrate, improve the bonding strength between coating film or glue and substrate, and solve the paint peeling or degumming phenomenon that occurs during coating and gluing process. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0024] The components of the embodiments of the present invention generally described and shown herein may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0026] Example:

[0027] The present invention provides a technical solution: a PVC anti-stone chip coating for automobiles, comprising a modified polyvinyl chloride paste resin, modified calcium carbonate, phthalate, a tackifier, a diluent, a thixotropic agent, a foaming agent, a heat stabilizer, a pigment and an adhesion promoter. The PVC anti-stone chip coating comprises, by weight percentage, 15-20% of the modified polyvinyl chloride paste resin, 30-35% of the modified calcium carbonate, 30-35% of the phthalate, 1.5-2% of the tackifier, 1.5-3% of the diluent, 1-2% of the thixotropic agent, 1-2% of the foaming agent, 0.5-1% of the heat stabilizer, 0.05-0.2% of the pigment and 0.5-1% of the adhesion promoter. The above components are mixed and stirred according to weight percentage to obtain the PVC anti-stone chip coating, and the obtained PVC anti-stone chip coating is a viscous paste with a solid content greater than 95%.

[0028] The preparation method of the automotive PVC anti-stone chip coating comprises the following steps:

[0029] S1: preparing a modified polyvinyl chloride paste resin, mixing the polyvinyl chloride paste resin and polyborosiloxane in a mass percentage of (1-30): (70-99) and stirring evenly, then adding a plasticizer and continuing to stir evenly, and finally subjecting the mixture to extrusion, plasticization and calendaring molding processes to obtain the modified polyvinyl chloride paste resin;

[0030] S2: preparing modified calcium carbonate by mixing heavy calcium carbonate powder and stearic acid in a mass ratio of 10:1 in a dry environment, stirring at room temperature -100°C for 30-60 minutes to uniformly mix the mixture, and uniformly dispersing the stearic acid on the surface of the heavy calcium carbonate powder to obtain modified calcium carbonate powder, wherein the mass concentration of stearic acid is 10%-30%;

[0031] S3: Measured by mass percentage, 2% diluent and 35% phthalate are mixed, and then 20% modified polyvinyl chloride paste resin is added and continued to be stirred, and then 35% modified calcium carbonate, 2% tackifier, 2% diluent, 1% thixotropic agent, 1% foaming agent, 1% heat stabilizer, 0.2% pigment, and 0.8% adhesion promoter are added and continued to be stirred, wherein the stirring temperature is room temperature-100°C, the stirring time is 20-30min, and the stirring speed is 1500rpm, and finally the automotive PVC anti-stone chip coating is obtained.

[0032] In this embodiment, the addition of modified calcium carbonate can make the PVC anti-stone chip coating have excellent elasticity and adhesion after curing, thereby improving the stone chip resistance and corrosion resistance of the PVC anti-stone chip coating;

[0033] Phthalate esters can improve the processing performance and flexibility of PVC anti-stone chip coatings by weakening the intermolecular forces of PVC in modified PVC paste resin and reducing the temperature required for its softening.

[0034] Tackifiers enhance the cohesion and adhesion of PVC anti-stone chip coatings to substrates, thus ensuring that the PVC anti-stone chip coatings adhere firmly to surfaces such as vehicle bottoms after application;

[0035] Thixotropic agents are additives used to improve the rheological properties of PVC anti-stone chip coatings. Their main function is to prevent the precipitation of pigments and fillers in PVC anti-stone chip coatings during storage, avoid splashing and sagging of PVC anti-stone chip coatings during coating, and improve the leveling properties of the coating film.

[0036] The foaming agent makes the PVC anti-stone chip coating have the effect of increasing the sound insulation and shock absorption of the coating after spraying;

[0037] Heat stabilizers are used to prevent the decomposition of modified polyvinyl chloride paste resin during processing and storage;

[0038] Adhesion promoters are chemicals used to enhance the adhesion between PVC anti-stone chip coatings and substrates, improve the bonding between the coating film or glue and the substrate, and solve the problem of paint peeling or debonding during the coating and gluing process;

[0039] Among them, when adding pigments, the color of the required pigments can be selectively selected according to actual production needs;

[0040] Adding diluent can improve the construction performance of PVC anti-stone chip coating, making it smoother during spraying and reducing problems during spraying, such as sagging and orange peel phenomenon;

[0041] Comparative Example:

[0042] A PVC anti-stone chip coating for automobiles comprises polyvinyl chloride paste resin, calcium carbonate, phthalate, a tackifier, a thixotropic agent, a diluent, a heat stabilizer and a pigment. The PVC anti-stone chip coating comprises, by weight percentage, 15-20% of polyvinyl chloride paste resin, 30-35% of calcium carbonate, 30-35% of phthalate, 1.5-2% of tackifier, 1.5-3% of diluent, 0.5-1% of heat stabilizer and 0.05-0.2% of pigment. The above components are mixed and stirred according to weight percentage to obtain the PVC anti-stone chip coating. The obtained PVC anti-stone chip coating is a viscous paste with a solid content greater than 95%.

[0043] The preparation method of the automotive PVC anti-stone chip coating comprises the following steps:

[0044] S1: mixing the diluent and phthalate;

[0045] S2: Add polyvinyl chloride paste resin and disperse;

[0046] S3: Add stabilizer, tackifier, thixotropic agent, calcium carbonate and pigment, vacuum and stir to remove bubbles in the product, and then you can get automotive PVC anti-stone chip coating.

[0047] Application Example Comparison Results Table:

[0048] index Thixotropic ring area (Pa / s) Yield value (Pa) Viscosity (mPa·s) Comparative Example 5981 159 237 Example 21963 227 401

[0049] The above table compares the results of the examples in which modified polyvinyl chloride paste resin, modified calcium carbonate, phthalate, tackifier, diluent, thixotropic agent, foaming agent, heat stabilizer, pigment and adhesion promoter are added, and the comparative examples in which polyvinyl chloride paste resin, calcium carbonate, phthalate, tackifier, diluent, thixotropic agent and pigment are added.

[0050] According to the above table, all indicators of the PVC anti-stone chip coating prepared in the embodiment are better than those in the comparative example.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A PVC anti-stone chipping coating for automobiles, characterized by: The invention comprises modified polyvinyl chloride paste resin, modified calcium carbonate, phthalate, tackifier, diluent, thixotropic agent, foaming agent, thermal stabilizer, pigment and adhesion promoter, wherein the weight percentage comprises 15-20% modified polyvinyl chloride paste resin, 30-35% modified calcium carbonate, 30-35% phthalate, 1.5-2% tackifier, 1.5-3% diluent, 1-2% thixotropic agent, 1-2% foaming agent, 0.5-1% thermal stabilizer, 0.05-0.2% pigment and 0.5-1% adhesion promoter. The above components are mixed and stirred according to weight percentage to obtain PVC anti-stone chip coating, and the obtained PVC anti-stone chip coating is a viscous paste with a solid content greater than 95%.

2. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The addition of the modified calcium carbonate can make the PVC anti-stone chip coating have excellent elasticity and adhesion after curing, thereby improving the stone chip resistance and corrosion resistance of the PVC anti-stone chip coating.

3. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The phthalate weakens the interaction between polyvinyl chloride molecules in the modified polyvinyl chloride paste resin and reduces the temperature required for its softening, thereby improving the processing performance and flexibility of the PVC anti-stone chip coating.

4. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The tackifier enhances the cohesion of the PVC anti-stone chip coating and its adhesion to the substrate, thereby ensuring that the PVC anti-stone chip coating can firmly adhere to a surface such as a vehicle bottom after application.

5. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The thixotropic agent is an auxiliary agent used to improve the rheological properties of the PVC anti-stone chip coating. Its main function is to prevent the precipitation of pigments and fillers in the PVC anti-stone chip coating during storage, avoid splashing and sagging of the PVC anti-stone chip coating during coating, and improve the leveling performance of the coating film.

6. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The foaming agent enables the PVC anti-stone chip coating to have enhanced sound insulation and shock absorption effects of the coating after spraying.

7. The automotive PVC anti-stone chipping paint according to claim 1, characterized in that: The heat stabilizer is used to prevent the modified polyvinyl chloride paste resin from decomposing during processing and storage.

8. The automotive PVC anti-stone chip coating according to claim 1, characterized in that: The adhesion promoter is a chemical substance used to enhance the adhesion between the PVC anti-stone chip coating and the substrate, improve the bonding strength between the coating film or glue and the substrate, and solve the paint peeling or debonding phenomenon that occurs during the coating and gluing process.

9. The method for preparing the automotive PVC anti-stone chipping coating according to any one of claims 1 to 8, characterized in that: The steps include: S1: preparing a modified polyvinyl chloride paste resin, mixing the polyvinyl chloride paste resin and polyborosiloxane in a mass percentage of (1-30): (70-99) and stirring evenly, then adding a plasticizer and continuing to stir evenly, and finally subjecting the mixture to extrusion, plasticization and calendaring molding processes to obtain the modified polyvinyl chloride paste resin; S2: preparing modified calcium carbonate by mixing heavy calcium carbonate powder and stearic acid in a mass ratio of 10:1 in a dry environment, stirring at room temperature -100°C for 30-60 minutes to uniformly mix the mixture, and uniformly dispersing the stearic acid on the surface of the heavy calcium carbonate powder to obtain modified calcium carbonate powder, wherein the mass concentration of stearic acid is 10%-30%; S3: Measured by mass percentage, 2% diluent and 35% phthalate are mixed, and then 20% modified polyvinyl chloride paste resin is added and continued to be stirred, and then 35% modified calcium carbonate, 2% tackifier, 2% diluent, 1% thixotropic agent, 1% foaming agent, 1% heat stabilizer, 0.2% pigment, and 0.8% adhesion promoter are added and continued to be stirred, wherein the stirring temperature is room temperature-100°C, the stirring time is 20-30min, and the stirring speed is 1500rpm, and finally the automotive PVC anti-stone chip coating is obtained.