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[Application Number] CN201611259612.8 [Application Date] 2016-12-30
[Publication Number] CN106832383A [Publication Date] 2017-06-13
[Applicant] Dongguan Jiaqian New Materials Technology Co., Ltd. [Address] 2nd Floor, Building 11, Innovation Technology Park, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province, 523000, China
Inventor: Wang Haiyan
[Patent Agency] Beijing Zhonghe Chengcheng Intellectual Property Agency Co., Ltd. 11246 [Agent] Lian Ping
[Country/Province Code] 44
[Abstract] This invention discloses a method for preparing formaldehyde-free flame-retardant composite engineered wood panels, comprising the following steps: First, a water-resistant adhesive is prepared; raw grapefruit peel is diced and crushed; crop straw is dried and crushed; grapefruit peel granules, crop straw granules, phenolic resin powder, water-resistant adhesive, and perlite powder are mixed evenly and then laid in a mold; hot-pressed at 140-150℃ and 3MPa for 5 minutes, then pressure is released; then hot-pressed at 170-180℃ and 7MPa for 8 minutes, then pressure is released and cooled to obtain an engineered wood panel blank; the above engineered wood panel blank is immersed in a tea polyphenol aqueous solution, ultrasonically treated at normal pressure, and then aged; then hot-pressed at 185-200℃ and 9MPa for 2 minutes, then pressure is released and cooled to obtain the composite engineered wood panel. The composite engineered wood panel prepared by this invention has high compressive strength, good impact resistance, no free formaldehyde release, good flame retardant properties, and low preparation cost.
[Claim 1] A method for preparing a formaldehyde-free flame-retardant composite artificial board, characterized by comprising the following steps: (1) Preparation of adhesive a) reacting 100-150 parts by weight of isocyanate and 50-75 parts by weight of polyester polyol at 65°C for 1-2 hours, raising the temperature to 80-85°C and holding for 1-2 hours to obtain a polyurethane prepolymer; b) adding 30-45 parts by weight of hydrophilic chain extender to the polyurethane prepolymer obtained above, carrying out a chain extension reaction at 60-70°C for 2-4 hours, then adding 10-15 parts by weight of small molecule diol chain extender, raising the temperature to 80-85°C. React at 85℃ for 2 hours, then cool to 50℃, add 30 parts of neutralizing agent (20 parts) for neutralization, maintain the temperature, stir at 1000 rpm (1200 rpm) and add deionized water for emulsification (5 parts) for 10 minutes to obtain a polyurethane waterborne prepolymer emulsion; c) Add 110 parts of degraded collagen solution (50 parts) to the above-prepared polyurethane waterborne prepolymer emulsion while stirring at 300 rpm (500 rpm), then continue stirring at 150 rpm (200 rpm), heat to 65℃, maintain the temperature for 1 hour and 2 hours, then cool to 50℃. (1) Remove volatiles under vacuum at 0℃ and negative pressure to obtain water-resistant adhesive; (2) Chop and crush the raw pomelo peel, then process it in a dryer to obtain granular pomelo peel, dry it in a desiccator, and use a vibrating square hole sieve to separate pomelo peel particles with a pore size of 2.5-10mm. Dry the crop straw and crush it into 3#6mm particles; (3) Mix 20#40 parts pomelo peel particles, 35#66 parts crop straw particles, 5#8 parts phenolic resin powder, 1#3 parts water-resistant adhesive, and 0.5#1.5 parts perlite powder evenly according to the weight. The mold is laid out, and hot-pressed at 140#150℃ and 3#6MPa for 5#11min, and then the pressure is released; then the temperature is raised to 170#180℃ at a heating rate of 5#12℃/min, and hot-pressed at 7#9MPa for 8#13min, and then the pressure is released and cooled to obtain the artificial board blank; (4) The above artificial board blank is soaked in tea polyphenol aqueous solution, ultrasonically treated at normal pressure for 30#60min, taken out and aged for 2#3h; then it is hot-pressed at 185#200℃ and 9#10MPa for 2#5min, and then the pressure is released and cooled to obtain the composite artificial board.