CN-121975405-A - Two-component composition and preparation method and application thereof

Abstract

The invention relates to a bi-component composition, a preparation method and application thereof, and belongs to the technical field of woodware seal primers. The two-component composition comprises an A component and a B component, wherein the A component comprises epoxy resin a1 and epoxy silane, the weight of the epoxy silane in the A component accounts for 18-80wt% of the total weight of the epoxy resin a1 and the epoxy silane, the B component comprises an addition product and amino silane, and the weight of the addition product in the B component accounts for 10-80wt% of the total weight of the addition product and the amino silane. The bi-component composition provided by the invention has the advantages of low odor, very fast hardness establishment and early polishing property establishment, extremely excellent pot life, excellent surface effect and flexibility, no organic solvent or only low-content organic solvent, and can be widely applied to woodware seal priming paint as a composition to improve the performance of woodware paint.

Inventors

• HU MIAO
• TAN XING
• OUYANG JIE
• SUN XUHUA
• ZHENG ZIJING
• JU XINGMING

Assignees

• 广州冠志新材料科技有限公司

Dates

Publication Date

20260505

Application Date

20260408

Claims (10)

1. 1. A two-component composition is characterized by comprising an A component and a B component, wherein: The component A comprises epoxy resin a1 and epoxy silane, wherein the weight of the epoxy silane in the component A accounts for 18-80wt% of the total weight of the epoxy resin a1 and the epoxy silane, the epoxy resin a1 contains two epoxy groups, and the epoxy silane is silane containing one epoxy group; The component B comprises an addition product and aminosilane, wherein the weight of the addition product accounts for 10-80wt% of the total weight of the addition product and the aminosilane, the addition product is obtained by reacting epoxy resin B1 and the aminosilane according to a molar ratio of 1:2, the epoxy resin B1 contains two epoxy groups, and the aminosilane in the component B and the aminosilane used for preparing the addition product each independently comprise at least one of compounds shown in formula (1); R 1 、R 2 、R 3 in formula (1) is each independently methyl or ethyl.
2. 2. The two-component composition according to claim 1, wherein the adduct and the aminosilane are added to the B component as a mixture prepared by reacting the epoxy resin B1 with an excess of the aminosilane at 40-80 ℃ for 0.5-60 hours.
3. 3. The two-component composition according to claim 1, wherein the epoxysilane comprises at least one of a compound of formula (2) and a compound of formula (3); Wherein R 4 、R 5 、R 6 in formula (2) is each independently methyl or ethyl, the statistical average value of x is 2-9, R 7 、R 8 、R 9 in formula (3) is each independently methyl or ethyl, and the statistical average value of y is 2-9.
4. 4. The two-component composition according to claim 1, wherein the weight of the epoxysilane in the A component is 25 to 80% by weight based on the total weight of the epoxy resin a1 and the epoxysilane.
5. 5. The two-component composition according to claim 1, wherein the epoxy resin b1 comprises at least one of the compounds of formula (4); r in formula (4) is a divalent C2-C25 hydrocarbon group, or a group formed by O spacing at least one group of adjacent carbon intermediates on the carbon chain of the divalent C2-C25 hydrocarbon group.
6. 6. The two-component composition according to claim 1 or 5, characterized in that: the epoxy resin a1 comprises at least one of bisphenol A epoxy resin, bisphenol F epoxy resin and hydrogenated bisphenol A epoxy resin; The epoxy resin b1 comprises at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether and butanediol diglycidyl ether.
7. 7. The two-component composition according to claim 1, wherein the component A and/or the component B further comprises an organic solvent, and the weight of the organic solvent is 0.01-30wt% of the total weight of the two-component composition.
8. 8. The two-component composition according to claim 1, wherein the ratio of the total weight of the epoxy resin a1 and the epoxy silane in the A component to the total weight of the adduct and the aminosilane in the B component is 1 (0.2 to 1.6).
9. 9. A process for preparing a two-component composition according to any one of claims 1 to 8, comprising the step of mixing the A component with the B component to obtain the two-component composition.
10. 10. Use of a two-component composition according to any one of claims 1 to 8 in a woodware primer sealer.

Description

Two-component composition and preparation method and application thereof Technical Field The invention relates to the technical field of woodware seal primers, in particular to a two-component composition, a preparation method and application thereof. Background Under the background of tight control of double carbon and emission, the environmental protection property of the paint product has become one of the core indexes of industry admission and market competition. The VOCs in the coating system are mostly contributed by diluents/organic solvents that continue to escape during curing, drying and film forming, not only bringing about atmospheric emission pressures, but also increasing operator health risks. Compared with solvent-free/ultra-low VOC coatings, traditional solvent-based coatings have difficulty in meeting increasingly strict regulations and customer requirements due to high solvent ratio and high emission intensity, and the development and application of low-VOC and even near-zero-VOC wood coating systems are promoted to be necessarily trend. In the woodenware coating process chain, the first primer (namely woodenware seal primer) plays a key role of wetting, penetration, sealing and bridging, and directly determines the adhesion, flatness and final appearance stability of the subsequent coating. The wood belongs to porous and hygroscopic base materials, the core short plate of the traditional solvent-borne wood sealing primer is concentrated on the problem of systematicness caused by 'high solvent dependence', firstly, the VOC emission intensity is high, the volatilization in the drying process is high, obvious odor, environment compliance pressure and personnel exposure risk are brought, secondly, the infiltration and swelling of the solvent to the wood are stronger, the deformation of base materials such as fiber rising, rib expanding and the like is easily induced, under the migration and carrying actions of the solvent, the wood content is more likely to exude to a coating film, the defects such as yellowing, color reversion, flower development and the like are caused, thirdly, the construction property is often required to be further diluted, the solid content is reduced, the film forming thickness of a paint film is limited at one time, multiple constructions are required to achieve covering and plumpness, the comprehensive construction efficiency and the material utilization rate are not dominant, and the safety risks of solvent vapor flammability, storage, paint mixing, spraying and drying links are higher, the dependence on explosion-proof ventilation, recovery treatment and fire-fighting system is high, and the comprehensive management cost is increased. The solvent-free coating system generally realizes the construction viscosity and film forming requirements by using the technologies of high solid resin, reactive diluent components or water/radiation curing and the like, so that the VOC source is obviously reduced, the on-site odor and the release amount of harmful volatile matters are lower, and the environmental protection regulation and the indoor air quality control requirements are more easily met. Meanwhile, as the volatile components are reduced, the volume shrinkage of the coating film is more controllable in the curing process, the porosity is reduced, the sealing property and the chemical resistance are often better, the appearance problems such as yellowing and pollution caused by migration of wood extracts (tannins, grease and the like) are favorably restrained, the swelling effect on wood fibers is relatively weakened, the occurrence probability of base material defects such as swelling ribs and fuzzing is reduced, and therefore the polishing property, interlayer adhesion and the consistency and durability of the whole coating of the base coat are improved. In addition, the solvent-free system has higher flash point and less flammable vapor, the fire explosion risk and the solvent storage and transportation management pressure in the production and construction links are synchronously reduced, and the professional health and safety management is more controllable. At present, the development of solvent-free/ultra-low VOC wood primer mainly comprises two routes: One such aqueous one-or two-component primer sealers based on acrylic emulsions/resins/dispersions are disclosed in CN104761992B, CN105295607B, CN105602377B, CN109111835B et al. However, the aqueous acrylic sealing primer is generally low in crosslinking degree, slower in drying and curing, weaker in film compactness and sealing performance than a solvent system, and in addition, due to the higher influence of the Tg of the acrylic resin, a certain amount of film forming auxiliary agent is often added into the formula, and although VOC (volatile organic compound) is obviously reduced, a further pressure drop space exists. And secondly, a solvent-free two-component seal primer developed around the epoxy resin an