CN-121975418-A - Powder coating for improving adhesive force of adhesive tape and preparation method thereof

Abstract

The application relates to the field of powder coatings, in particular to a powder coating for improving adhesive force of an adhesive tape and a preparation method thereof. The powder coating for improving adhesive force of the adhesive tape comprises 55-80% of polyester resin, 4-6% of curing agent, 0.5-1.2% of leveling agent, 0.5-1.5% of degassing agent, 0.5-3% of high-melting-point solid polyol and the balance of pigment and/or filler, wherein the high-melting-point solid polyol is a polyhydroxy-containing compound with a melting point of 95-200 ℃. The application can obtain excellent low-temperature cohesiveness by adding high-melting-point solid polyol, and simultaneously, the conventional performance of the coating is not damaged at all.

Inventors

• WANG XUYING
• DU TAO
• WANG LIJUN

Assignees

• 绮一舟(河北)科技有限公司

Dates

Publication Date

20260505

Application Date

20260320

Claims (8)

1. 1. The powder coating for improving the adhesive force of the adhesive tape is characterized by comprising, by weight, 55-80% of polyester resin, 4-6% of a curing agent, 0.5-1.2% of a leveling agent, 0.5-1.5% of a degassing agent, 0.5-3% of a high-melting-point solid polyol and the balance of pigment and/or filler; The high melting point solid polyol is a polyhydroxy-containing compound having a melting point of between 95 and 200 ℃.
2. 2. A powder coating for improving adhesive tape adhesion according to claim 1, wherein the high melting point solid polyol is selected from one or more of aliphatic polyols, aromatic polyols or derivatives thereof.
3. 3. A powder coating for improving adhesive tape adhesion according to claim 2, wherein the high melting point solid polyol is selected from one or more of erythritol, D-mannitol, D-galactose, D-xylose, maltitol, and carboxylic acid ester and ether derivatives thereof.
4. 4. The powder coating for improving adhesion of a tape of claim 1, wherein the curing agent is one or more of triglycidyl isocyanurate, β -hydroxyalkylamide, blocked isocyanate, or epoxy resin.
5. 5. The powder coating for improving adhesive force of adhesive tape according to claim 1, wherein the polyester resin is a carboxyl terminated polyester resin having an acid value of 17 to 55mgKOH/g and a viscosity of 2000 to 8500 mPa-s at 200 ℃.
6. 6. The powder coating for improving adhesive force of adhesive tape according to claim 1, wherein the leveling agent is an acrylic leveling agent.
7. 7. A method of preparing a powder coating for improving adhesive tape adhesion as defined in any one of claims 1-6, comprising the steps of: s1, weighing the components according to the formula proportion, and premixing to obtain a premix; S2, melting, mixing and extruding the premix, wherein the high-melting-point solid polyol is dispersed in a melting system in a solid particle form; s3, cooling, crushing and sieving the extrudate to obtain the powder coating.
8. 8. The method for preparing a powder coating for improving adhesive strength of an adhesive tape according to claim 7, wherein the melt-kneading temperature in the step S2 is 90-120 ℃.

Description

Powder coating for improving adhesive force of adhesive tape and preparation method thereof Technical Field The application relates to the field of powder coatings, in particular to a powder coating for improving adhesive force of an adhesive tape and a preparation method thereof. Background The powder coating has been widely used in the fields of architectural aluminum profiles, household appliances, furniture and general industry because of the advantages of no VOC emission, environmental protection, recycling and the like. Compared with liquid paint, the three-dimensional net-shaped coating film formed by curing the powder paint has more excellent wear resistance, solvent resistance and weather resistance. However, it is also this dense and stable film coating structure that results in very low surface energy at low temperature environments, and the polar groups are "frozen" such that conventional pressure sensitive adhesive tapes or retroreflective tapes requiring thermal activation cannot be effectively spread and adhered to the coated surface. This drawback is particularly troublesome for the painters who convert from liquid to powder paint, for example, the inability to apply light reflective strips to painted traffic (guardrails, signs) in winter, or the inability to apply labels to the surface of cold chain equipment in the logistics industry. To solve this problem, the prior art generally employs a manner of flame treating, corona treating, or applying a primer to the surface of the coating, but these methods increase the process, equipment costs, and environmental risks, and the treatment effect decays with time. Therefore, it is important to develop a powder coating having excellent low-temperature adhesion properties by itself. Content of the application In order to solve the problem of poor bonding effect between a coating and an adhesive tape in a low-temperature environment, the application provides a powder coating for improving adhesive tape bonding force and a preparation method thereof. In a first aspect, the application provides a powder coating for improving adhesive force of an adhesive tape, which adopts the following technical scheme: The powder coating for improving adhesive force of the adhesive tape comprises 55-80% of polyester resin, 4-6% of curing agent, 0.5-1.2% of leveling agent, 0.5-1.5% of degassing agent, 0.5-3% of high-melting point solid polyol and the balance of pigment and/or filler in percentage by weight; The high melting point solid polyol is a polyhydroxy-containing compound having a melting point of between 95 and 200 ℃. By adopting the technical scheme, the high-melting-point solid polyol with a specific melting point range (95-200 ℃) is introduced into a powder coating system as a functional auxiliary agent, the polyol is uniformly dispersed in a solid particle form in the melt mixing process by utilizing the characteristic that the melting point is higher than the conventional extrusion temperature, hydroxyl functional groups are locked in a crystal structure and cannot react in advance, and in the subsequent coating curing stage, the polyol is melted and partially participates in the crosslinking reaction to graft into a coating network, and unreacted hydroxyl groups remain on the surface of the cured coating, so that chemical bonding sites are provided for reactive functional groups (such as isocyanate groups and carboxyl groups) in the adhesive tape. So that the 180-degree peeling strength of the coating layer and the reflective adhesive tape at low temperature is improved. Meanwhile, the addition amount of 0.5-3% can ensure that key indexes such as gloss, impact strength, adhesive force, pencil hardness and the like of the coating are equal to those of the coating without the addition of the polyol, and excellent low-temperature cohesiveness is obtained without sacrificing conventional performance. Further, the high-melting solid polyol is selected from one or more of aliphatic polyols, aromatic polyols or derivatives thereof. By adopting the technical scheme, the type of the polyol is further limited to aliphatic or aromatic polyol and derivatives thereof, the two types of polyol have a plurality of hydroxyl functional groups and have adjustable melting points, the polyol can be kept in solid dispersion in the extrusion stage and can be partially grafted into a coating network in the curing stage, wherein the aliphatic polyol (such as pentaerythritol and mannitol) has good molecular chain flexibility, the toughness of the coating is kept, the surface hydroxyl is provided, and the aromatic polyol and derivatives thereof can synergistically improve the hardness and heat resistance of the coating due to the rigid structure of the polyol. On one hand, the wide source and cost controllability of raw materials are ensured, the industrial popularization is facilitated, on the other hand, the performance adjustability is provided for different application scenes,