High-performance Low-pressure Impregnated Paper With A Short Cycle Resin

This paper reviews the domestic and urea-formaldehyde resin and melamine formaldehyde resin production and application status, and analysis of the two resins and international research progress. Explore a large number of experiments based on the period of low short-impregnated paper with urea-formaldehyde and melamine formaldehyde resin modified resin formulations, synthetic techniques and in-depth study of the impregnation process.For low-voltage short-cycle-impregnated paper with a urea-formaldehyde resin technology and performance requirements, its a recipe selection, pH, control, urea feeding methods, lower aldehyde agent type and dosage and other factors were optimized test, according to test results, develop a short period can be used for low-pressure impregnated decorative paper core layer of urea-formaldehyde resin used in adhesive formulations and synthetic processes. Impregnated with urea-formaldehyde adhesive that the main process parameters:F/U molar ratio of1.60:1; Phase in acidic pH value controlled at3.8to4.1; urea in two feeding; Formaldehyde scavenger for the melamine-formaldehyde and alcohols as the main The composite component, adding the amount of chemical raw materials6%of the total mass, with the reaction temperature and reaction time of reasonable control, synthesized with a low free formaldehyde content, storage stable moderate, high solids, low viscosity advantages of urea-formaldehyde resin, by using proven, the resin adhesives can be used to complete the core layer impregnated decorative paper.Impregnated paper for the low-pressure short cycle process using melamine-formaldehyde resin and performance requirements, making the molar ratio of choice, adding variety and amount of modifier, and other factors to optimize the amount of water added on a pilot basis, has been using melamine formaldehyde resin impregnated paper optimization formulation and synthesis processes, the adhesive impregnated with melamine formaldehyde resin as the main process parameters:F/M molar ratio of1.60:1; pH control at an early stage in the9.4~9.6; melamine and formaldehyde are the way to a feeding; modifier as diethylene glycol, adding the amount of chemical raw materials2%of the total quality, water quality chemical raw materials by adding the total amount of14%. Based on the above factors as well as reaction temperature, reaction time, pH value control, endpoint control, impact on the quality of the comparative analysis of the resin synthesized with low formaldehyde content, stable storage medium, solid content, viscosity, etc. of the melamine formaldehyde moderate modified resin, the use of evidence, the adhesive resin impregnated decorative paper can be used to complete the surface coating.Select three decorative paper, respectively, using the urea-formaldehyde resin and melamine-formaldehyde resin modified immersion test of their joint done by small scale laboratory production line in the middle and impregnated test results show that:in the first drying phase, before the use of high temperature drying to low heat at medium temperature control between100℃-135℃, and the second drying section of the import and export segments to low temperature, the middle section of high-temperature drying method, heat medium temperature was controlled at between100℃-160℃. By adding appropriate amount of additives modulated the resin (melamine resin must be added to the resin of which10%of the amount of dilution water), using the impregnation drying process to produce fully qualified impregnated decorative paper.In the impregnation process and pilot small scale while pressing for the corresponding process finishes testing and factory production, the results show that the three-level impregnated decorative paper and particleboard substrate group E2blank in the hot plate temperature of182-190℃, Pressure of pressing unit2-2.5MPa, hot closing time of40to50seconds of conventional hot pressing process conditions, to produce decorative panels E1formaldehyde emission level standard, with excellent wear tolerance properties, other properties also have reached the national standard.Based on the above test can be concluded: the subject of the study of urea-formaldehyde resin and melamine-formaldehyde resin can be used not only completely impregnated decorative paper production, and post-impregnated paper, decorative veneer panels with low formaldehyde, high wear resistance, high tolerance, etc. superior performance, fully explain the two resins is a high physical and chemical properties and application.