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CN-122011984-A - Environment-friendly single-component urea-formaldehyde resin adhesive powder for molded door and preparation method thereof

CN122011984ACN 122011984 ACN122011984 ACN 122011984ACN-122011984-A

Abstract

The application relates to the field of functional resin adhesive powder, in particular to environment-friendly single-component urea-formaldehyde resin adhesive powder for a molded door and a preparation method thereof. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door comprises raw materials such as formaldehyde aqueous solution, urea, melamine, alkaline regulator, acid regulator, composite functional agent and the like. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door, which is finally prepared, realizes the common improvement of the environment protection performance and the comprehensive performance through an innovative low-molar-ratio formula, a staged urea feeding process and a unique compound scheme of a compound functional agent.

Inventors

  • LIANG ZIJUN
  • LI BAONING

Assignees

  • 广州原野实业有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door is characterized by comprising, by mass, 90-110 parts of formaldehyde aqueous solution, 50-65 parts of urea, 11-14 parts of melamine, 0.8-1.5 parts of alkaline regulator, 0.5-1.2 parts of acid regulator, 1.5-3 parts of capturing agent, 3-5 parts of wetting agent and 3-6 parts of composite functional agent; the mass concentration of the formaldehyde aqueous solution is 35-38%; The composite functional agent is a combination of hyperbranched polyhydroxyester, trimethylolpropane triglycidyl ether and 2-phosphonic butane-1, 2, 4-tricarboxylic acid, and the mass ratio of the composite functional agent to the 2-phosphonic butane-1, 2, 4-tricarboxylic acid is (1.5-3) (0.8-1.3) (0.5-1).
  2. 2. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door, which is characterized in that the mass ratio of the formaldehyde aqueous solution to the urea to the melamine is (9.5-10.5) (5.2-5.8) (1.2-1.4).
  3. 3. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door, which is characterized in that the mass ratio of the formaldehyde aqueous solution to the composite functional agent is (9.5-10.5) (0.4-0.6).
  4. 4. The environment-friendly single-component urea-formaldehyde resin adhesive powder for molded doors as claimed in claim 3, wherein the alkaline regulator is at least one of sodium hydroxide aqueous solution, sodium carbonate aqueous solution, potassium hydroxide aqueous solution and triethanolamine.
  5. 5. The environment-friendly single-component urea-formaldehyde resin adhesive powder for molded doors as claimed in claim 4, wherein the acid regulator is at least one of aqueous formic acid solution, aqueous acetic acid solution, aqueous phosphoric acid solution and aqueous citric acid solution.
  6. 6. The environment-friendly single-component urea-formaldehyde resin adhesive powder for molded doors as claimed in claim 5, wherein the trapping agent is benzoguanamine and/or polyvinyl amine.
  7. 7. The environment-friendly single-component urea-formaldehyde resin adhesive powder for molded doors as claimed in claim 6, wherein the wetting agent is at least one of polyvinyl alcohol 1788, polyvinyl alcohol 1799, sodium carboxymethyl cellulose, hydroxyethyl cellulose and starch ether.
  8. 8. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded doors, which is characterized in that the capturing agent is a combination of benzoguanamine and polyvinyl amine, and the mass ratio of the capturing agent to the polyvinyl amine is (1.2-1.8) (3-4).
  9. 9. A preparation method of the environment-friendly single-component urea-formaldehyde resin adhesive powder for a molded door is characterized by comprising the following steps of S1, adding formaldehyde aqueous solution, a first part of urea and a wetting agent into a mixing reaction kettle, adding a part of alkaline regulator in stirring, adjusting pH to be within a range of 8-8.2, heating by steam, preserving heat, S2, adding a second part of urea, adding a part of acidic regulator to adjust pH to be within a range of 5-5.2, continuously reacting after heating, adding a third part of urea, keeping the pH of a reaction system to be within a range of 5.2-5.4 by the residual acidic regulator during the reaction, adjusting the pH of the reaction system to be 8-9 by the residual alkaline regulator after the reaction time is finished, adding melamine, preserving heat, reacting, adding the residual other raw materials after the reaction is finished, stirring at a low temperature, obtaining uniform resin adhesive solution, and conveying to a spray drying system for drying.
  10. 10. The preparation method of the environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded doors, which is characterized in that the mass ratio of the first part of urea to the second part of urea to the third part of urea is (3-4): 2-4.

Description

Environment-friendly single-component urea-formaldehyde resin adhesive powder for molded door and preparation method thereof Technical Field The application relates to the field of functional resin adhesive powder, in particular to environment-friendly single-component urea-formaldehyde resin adhesive powder for a molded door and a preparation method thereof. Background The molded door is used as an important component of interior decoration and household building materials, urea-formaldehyde resin is widely used as an adhesive in the manufacturing process of the molded door, and the molded door is molded, glued and structurally stable. The traditional urea-formaldehyde resin adhesive powder for the molded door is generally prepared based on the polycondensation reaction of formaldehyde and urea, has the advantages of low cost, quick solidification, higher bonding strength and the like, and is widely applied in industry, however, along with the improvement of global environmental awareness and the increase of the requirements of healthy households, the adhesive powder also faces more serious challenges in formaldehyde release control. In the prior art, typical preparation methods of urea-formaldehyde resin powder for molded doors include controlling the molar ratio of formaldehyde to urea, adding a curing agent or modifier to optimize the gluing properties and reduce free formaldehyde. For example, the products commonly found in the market are modified by reducing the molar ratio and adding a small amount of other auxiliary agents to make the formaldehyde release amount reach E0 level standard (namely less than or equal to 0.05mg/m 3). The technology reduces formaldehyde emission to a certain extent, but is limited by reaction efficiency and material proportion, and the environmental protection level and comprehensive application performance of the technology are difficult to further improve. In addition, the existing technology often adopts a mode of adding urea at one time or simply in multiple times, which leads to insufficient reaction, higher free formaldehyde residue, and possibly influences the bonding strength and weather resistance, thus limiting the application of the molded door in the high-end market. Related content shows that formaldehyde emission standards are continuously updated, ENF grade (namely less than or equal to 0.025mg/m < 3 >) is a globally leading environment-friendly standard, and related regulations are forced to require building material products to reach ENF grade level especially in developed areas such as Europe, north America and the like, thereby promoting innovation of adhesive industry to ultra-low formaldehyde direction. Melamine modified urea formaldehyde resin can form a more stable cross-linked structure, so that formaldehyde release can be effectively reduced, and the gluing performance can be improved, but the application of the melamine modified urea formaldehyde resin in the prior art still has the defects, such as cost increase or process complexity caused by improper modification proportion, and the performance balance is difficult to realize in the scene of special requirements on the fluidity and the curing speed of the adhesive, such as a molded door. Disclosure of Invention In summary, the existing single-component urea-formaldehyde resin adhesive powder for the molded door mainly has the advantages that the formaldehyde release amount can only reach E0 level generally and cannot meet the ENF level environmental protection standard, the comprehensive application performances such as bonding strength, weather resistance or processability are often sacrificed while formaldehyde is reduced, the control on free formaldehyde is not thorough enough, the reaction process is not optimized enough, and the product performance is limited. Therefore, developing urea-formaldehyde resin adhesive powder which can not only realize the release amount of ENF-grade formaldehyde, but also maintain excellent gluing performance and single-component convenient use becomes a technical problem to be solved in the field of manufacturing molded doors. The environment-friendly single-component urea-formaldehyde resin adhesive powder for the molded door comprises, by mass, 90-110 parts of formaldehyde aqueous solution, 50-65 parts of urea, 11-14 parts of melamine, 0.8-1.5 parts of an alkaline regulator, 0.5-1.2 parts of an acidic regulator, 1.5-3 parts of a trapping agent, 3-5 parts of a wetting agent and 3-6 parts of a composite functional agent. Preferably, the mass concentration of the formaldehyde aqueous solution is 35-38%. Preferably, the mass concentration of the formaldehyde aqueous solution is 36-37%. Preferably, the mass ratio of the urea to the melamine in the formaldehyde aqueous solution is (9.5-10.5) (5.2-5.8) (1.2-1.4). Preferably, the mass ratio of the urea to the melamine in the formaldehyde aqueous solution is (9.8-10) (5.3-5.5) (1.2-1.3). Preferably, the mass ratio o