A kind of bamboo-based fiber composite material based on modified adhesive and new forming method and its preparation method and application
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 reactor, start the stirrer, and the stirring speed is 1000r / min; stir evenly; slowly add under the temperature condition of 42±2°C The first batch of 103 parts of 50wt% formaldehyde aqueous solution was heated to 70°C within 60min, under the temperature condition of 72±2°C, the stirring speed was 1000r / min, stirred for 50min, cooled to 40°C to obtain reaction solution A, collected for use;
[0065] (2) add 97 parts of 50wt% formaldehyde aqueous solution and 24 parts of first batch of urea in the reactor again, make the mol ratio of formaldehyde and urea be 4:1, pH is adjusted to 7.0, be warming up to 88 ± 2 ℃, stirring reaction After 30 minutes, the pH of the reaction system was adjusted to 3.5, 35 parts of polyvinyl alcohol and 35 parts of polyethylene glycol were added, and the temperature was raised...
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 reactor, start the stirrer, and the stirring speed is 1000r / min; stir evenly; slowly add under the temperature condition of 42±2°C The first batch of 100 parts of 50wt% formaldehyde aqueous 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 reaction solution A, which was collected and used for later use;
[0071] (2) re-add 80 parts of 50wt% formaldehyde solution and 20 parts of first batch of urea in the reactor, make the mol ratio of formaldehyde and urea be 4:1, adjust pH to 7.5, be warming up to 82 ± 2 ℃, stirring reaction After 20 minutes, the pH of the reaction system was adjusted to 3, 38 parts of polyvinyl alcohol and 38 parts of polyethylene glycol were added, the temperature was raised to 92 ± 2 ° C, and the reaction was...
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 reactor, start the stirrer, and the stirring speed is 1000r / min; stir evenly; slowly add under the temperature condition of 43±2°C The first batch of 70 parts of 50wt% formaldehyde aqueous solution was heated to 75±2°C within 60min, the stirring speed was 1500r / min, stirred for 60min, cooled to 40°C to obtain reaction solution A, which was collected for later use;
[0077] (2) add 150 parts of 50wt% formaldehyde aqueous solution and 25 parts of first batch of urea in the reactor again, make the mol ratio of formaldehyde and urea be 6:1, pH is adjusted to 8, be warming up to 85 ± 2 ℃, stirring reaction After 40 minutes, the pH of the reaction system was adjusted to 3.5, 40 parts of polyvinyl alcohol and 40 parts of polyethylene glycol were added, the temperature was raised to 93±2° C., and reacted for ...
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