Search

CN-121991560-A - Cationic aqueous two-component seal primer and preparation method thereof

CN121991560ACN 121991560 ACN121991560 ACN 121991560ACN-121991560-A

Abstract

The invention belongs to the technical field of paint, and in particular relates to a cationic aqueous two-component seal primer and a preparation method thereof, wherein the cationic aqueous two-component seal primer comprises a component A and a component B, and the component A comprises the following raw materials of cationic aqueous acrylic resin, a film forming auxiliary agent, a defoaming agent, a wetting dispersing agent, a filler, a polishing auxiliary agent, a leveling agent, a defoaming agent, a substrate wetting agent, a drier, a cosolvent and deionized water; the component B comprises the following raw materials of a silane oligomer curing agent, absolute ethyl alcohol and deionized water, wherein cationic aqueous acrylic resin is adopted as main resin, other auxiliary agents are matched, the silane oligomer curing agent is adopted as main curing component, the prepared seal primer has short actual drying time, the hardness and the cohesive force of a formed paint film can meet the use requirement, and the surface of the paint film has no bubbles and shrinkage cavities, so that the paint film has good sealing effect, good polishing performance and high appearance requirement of adapting to white coating, and is green and environment-friendly.

Inventors

  • KE JIAHUA
  • Wu Houqing
  • HONG WEIDONG

Assignees

  • 恒昌涂料（惠阳）有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (7)

  1. 1. The cationic aqueous two-component seal primer is characterized by comprising an A component and a B component, wherein the mass ratio of the A component to the B component is 100 (50-60); The component A comprises, by mass, 50-65 parts of cationic aqueous acrylic resin, 5-10 parts of film forming auxiliary agents, 0.2-0.4 part of defoaming agents, 0.3-0.5 part of wetting dispersing agents, 2-4 parts of fillers, 1-3 parts of polishing auxiliary agents, 0.1-0.3 part of leveling agents, 0.1-0.3 part of defoaming agents, 0.2-0.4 part of substrate wetting agents, 0.2-0.4 part of drier, 3-6 parts of cosolvent and 15-35 parts of deionized water; the component B comprises the following raw materials in parts by mass, 30 parts of silane oligomer curing agent, 70 parts of absolute ethyl alcohol and 100 parts of deionized water.
  2. 2. The cationic aqueous two-component sealer according to claim 1, wherein said aqueous cationic acrylic resin is a feather stone 1813A.
  3. 3. The cationic aqueous two-component sealer according to claim 1, wherein said film forming aid is propylene glycol methyl ether, said defoamer is BYK024, and said wetting dispersant is TEGO740.
  4. 4. The cationic aqueous two-component sealer according to claim 1, wherein said filler is 1250 mesh transparent powder and said grinding aid is han-TV-P zinc powder.
  5. 5. The cationic aqueous two-component sealer according to claim 1, wherein the leveling agent is BYK7420, the defoamer is TEGO450, the substrate wetting agent is BYK346, and the co-solvent is absolute ethanol.
  6. 6. The cationic aqueous two-component sealer according to claim 1, wherein said silane oligomer curing agent is KH-560.
  7. 7. A method of preparing a cationic aqueous two-component primer sealer according to any one of claims 1 to 6, comprising the steps of: the preparation of the component A comprises the steps of adding cationic water-based acrylic resin and a film forming additive into a container, stirring at a rotation speed of 600-800rpm to uniformly mix the components to obtain a material body 1, adding a defoaming agent, a wetting dispersant, a filler and a polishing additive into the material body 1, stirring at a rotation speed of 1200-1500rpm to uniformly mix the components to obtain a material body 2, adding a leveling agent, a defoaming agent, a base material wetting agent, a drier, a cosolvent and deionized water into the material body 2, and stirring uniformly to obtain the component A; the preparation of the component B, namely adding a silane oligomer curing agent and absolute ethyl alcohol into a container, stirring at a rotating speed of 400-600rpm to uniformly mix the silane oligomer curing agent and the absolute ethyl alcohol to obtain a material body 3, and uniformly stirring and mixing the material body 3 and deionized water according to a mass ratio of 1:1 to obtain the component B; And (3) uniformly stirring and mixing the component A and the component B according to the mass ratio of 100 (50-60) to obtain the cationic aqueous double-component seal primer.

Description

Cationic aqueous two-component seal primer and preparation method thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to a cationic aqueous two-component seal primer and a preparation method thereof. Background In the field of furniture manufacturing, particularly in the coating process of high-tannic acid-content wood such as oak, walnut, jersey and the like, the performance of the seal primer directly determines the appearance quality and weather-proof stability of a final product, and is one of key factors influencing the market competitiveness of furniture products. The core function of the woodware seal primer is to effectively block tannic acid, phenolic substances, natural pigment, water and the like in a wood matrix from migrating to the surface of a coating, avoid the defects of whitening, yellowing, bleeding, light loss and the like of subsequent finishing paint from the source, and simultaneously provide a stable adhesion substrate for the finishing paint by forming a uniform and compact transition film on the surface of the wood, so that the interlayer binding force and the service life of the whole coating system are ensured. The traditional water-based wood sealing primer is designed by adopting a single-component system, wherein film forming substances mainly depend on anionic acrylic resin, polyurethane dispersoid or common cationic epoxy resin, and the system has obvious technical bottlenecks in practical application, on one hand, the anionic resin has weak adsorption and blocking capability on cationic tannic acid and pigment in wood, the common cationic resin slightly improves the sealing property of polar substances, but has the problems of over-strong molecular chain rigidity and insufficient compatibility with wood fibers, so that the sealing effect on high-tannic acid wood still cannot meet the requirements of industrial production, and the problems of yellowing of paint film, local bleeding and the like easily occur after the coating, on the other hand, the traditional product is limited by the limit of resin vitrification temperature, moisture volatilization rate and crosslinking reaction efficiency, the drying speed is low (the surface drying time is usually more than 40min, the real drying time is 8-12 h), the polishing performance is poor (the paint film hardness is insufficient or embrittlement is easy to occur after polishing), the production line of furniture is severely restricted, and the production cycle and the labor cost is increased. In order to improve the defects, various optimization schemes are proposed in the prior art, but the contradiction that the coating construction thickness is increased or excessive sealing agents (such as melamine formaldehyde resin and urea formaldehyde resin) are added to strengthen the sealing performance is difficult to cause the accumulation of internal stress of a paint film, embrittlement and cracking phenomena occur, meanwhile, the adhesive force between the paint film and a base material and between layers is obviously reduced, interlayer peeling risks are caused, for example, when a high-reactivity crosslinking monomer or curing agent is introduced for accelerating the drying speed, the surface drying and actual drying time can be shortened, the paint film hardness can be increased too quickly, polishing resistance is increased, a construction window is narrowed, the paint film flexibility is easily reduced, cracking occurs in the process of thermal expansion and contraction of wood, and in addition, part of high-performance sealing primers still depend on a solvent type system, the solubility and the film forming compactness of the resin are improved through an organic solvent, but the emission amount of Volatile Organic Compounds (VOC) is usually more than 120g/L, the emission limit value of 80g/L in the furniture manufacturing industry of the standard of volatile organic compound emission (GB 37822-2019) is not met, and the current requirements of the furniture is not more than 80g/L in the environment-friendly furniture production industry, and the environment-friendly furniture is limited in the environment-friendly furniture production industry, and the furniture production end is difficult to develop. With the continuous improvement of the appearance quality and environmental protection performance requirements of consumers on furniture products and the increasingly strict national environmental protection policy, the problem of unbalance among the sealing property, the drying speed, the polishing property and the environmental protection property of the traditional water-based wood sealing primer becomes a core pain point for restricting the high-quality development of the furniture coating industry. Therefore, the development of the water-based wood sealing primer with high-efficiency sealing performance (capable of effectively blocking the migration of harmful substan