Bamboo-based fiber composite material based on modified adhesive and novel assembly mode, and preparation method and application thereof
A technology of fiber composite materials and adhesives, which is applied in the direction of adhesives, adhesive types, and pretreatment of molding materials. It can solve problems such as failure to meet the requirements of home building materials, high formaldehyde release from boards, and boards that cannot be directly nailed. The effect of improving the dimensional stability of the plate, superior physical and mechanical properties, and high utilization of raw materials
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Embodiment 1
[0063] Preparation of bamboo-based fiber composite adhesive:
[0064] (1) In parts by weight, add 80 parts of water, 100 parts of phenol, and 10 parts of sodium hydroxide to the reaction kettle, start the stirrer, and the stirring speed is 1000r / min; stir evenly; slowly add The first batch of 103 parts of 50wt% formaldehyde solution was heated up to 70°C within 60min, under the temperature condition of 72±2°C, the stirring speed was 1000r / min, stirred for 50min, and cooled to 40°C to obtain the reaction solution A, which was collected for later use;
[0065] (2) Add 97 parts of 50wt% formaldehyde aqueous solution and 24 parts of the first batch of urea to the reaction kettle again, so that the molar ratio of formaldehyde and urea is 4:1, adjust the pH to 7.0, heat up to 88±2°C, and stir the reaction After 30 minutes, adjust the pH of the reaction system to 3.5, add 35 parts of polyvinyl alcohol and 35 parts of polyethylene glycol, raise the temperature to 93±2°C, and react for...
Embodiment 2
[0069] Preparation of bamboo-based fiber composite adhesive:
[0070] (1) In parts by weight, add 60 parts of water, 100 parts of phenol, and 8 parts of sodium hydroxide to the reaction kettle, start the stirrer, and the stirring speed is 1000r / min; stir evenly; slowly add in the temperature condition of 42±2°C The first batch of 100 parts of 50wt% formaldehyde solution was heated to 72±2°C within 50min, the stirring speed was 800r / min, stirred for 30min, and cooled to 40°C to obtain the reaction solution A, which was collected for later use;
[0071] (2) Add 80 parts of 50wt% formaldehyde aqueous solution and 20 parts of the first batch of urea to the reaction kettle again, so that the molar ratio of formaldehyde and urea is 4:1, adjust the pH to 7.5, raise the temperature to 82±2°C, and stir the reaction After 20 minutes, adjust the pH of the reaction system to 3, add 38 parts of polyvinyl alcohol and 38 parts of polyethylene glycol, raise the temperature to 92±2°C, and reac...
Embodiment 3
[0075] Preparation of bamboo-based fiber composite adhesive:
[0076] (1) In parts by weight, add 100 parts of water, 100 parts of phenol, and 13 parts of sodium hydroxide to the reaction kettle, start the agitator, and the stirring speed is 1000r / min; stir evenly; slowly add The first batch of 70 parts of 50wt% formaldehyde solution was heated to 75±2°C within 60 minutes, the stirring speed was 1500r / min, stirred for 60 minutes, and cooled to 40°C to obtain the reaction solution A, which was collected for later use;
[0077] (2) Add 150 parts of 50wt% formaldehyde aqueous solution and 25 parts of the first batch of urea to the reaction kettle again, so that the molar ratio of formaldehyde and urea is 6:1, adjust the pH to 8, heat up to 85±2°C, and stir the reaction After 40 minutes, adjust the pH of the reaction system to 3.5, add 40 parts of polyvinyl alcohol and 40 parts of polyethylene glycol, raise the temperature to 93±2°C, and react for 60 minutes to obtain reaction sol...
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