Biomass adhesive, preparation method of the biomass adhesive and bonded wood plate
A technology for gluing wood boards and adhesives, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc. It can solve the problems of poor fluidity and water resistance, low bonding strength, and high preparation costs to achieve good flow Sexuality, reduction of preparation cost, and the effect of low preparation cost
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[0014] According to the preparation method of biomass adhesive provided by the present invention, the method may further comprise the steps:
[0015] (1) Carrying out the first contact with the camellia oleifera cake with alkali and water to obtain the product after the first contact;
[0016] (2) In the presence of a polycondensation catalyst, the first contacted product is subjected to a second contact with phenol and aldehyde under polycondensation conditions to obtain a second contacted product with a viscosity of 500-5000 centipoise.
[0017] It should be noted that the camellia oleifera cake in the present invention refers to the solid matter remaining after the camellia oleifera seed oil is extracted from the seeds of Camellia oleifera. There are no specific requirements for the moisture content and oil content of the meal. For example, it can be purchased commercially from various units dealing in Camellia oleifera-related products, the oil content of Camellia oleifer...
Embodiment 1
[0043] In a 1.5L flask, add 140g Camellia oleifera cake (purchased from the Institute of Subtropical Forestry, Chinese Academy of Forestry, oil content≤3% by weight) and 400g water, at room temperature, stir for 20 minutes, add alkali (hydroxide Sodium) makes the pH value of the stirred product 9.5 to obtain the first contact product P1.
[0044] Then, 165 g of a concentration of 37% by weight of formaldehyde solution, 100 g of phenol and 9.8 g of polycondensation catalyst (7 g of sodium hydroxide mixed with 2.8 g of sodium carbonate) were added to the first contact product P1 and at the same time alkali (sodium hydroxide) was added to Make the pH value 10.5-11, and then maintain stirring at a temperature of 85-90° C. for 120 minutes to obtain the product Q1 of the second contact. The viscosity of the second contacted product Q1 was measured to be 4000 centipoise at 25°C.
[0045] Add 210 grams of filler (camellia oleifera cake from the same source as above) to the second con...
Embodiment 2
[0048] In the flask of 1.5L, add 120g Camellia oleifera cake (purchased from Institute of Subtropical Forestry, Chinese Academy of Forestry, oil content≤3% by weight) and 400g water, at room temperature and under stirring, contact 25 minutes, add alkali ( Sodium hydroxide) makes the product pH value after contacting be 9.2, obtains the first contacting product P2.
[0049] Then, 180 g of a concentration of 37% by weight formaldehyde solution, 100 g of phenol, and 21 g of polycondensation catalyst (15 g of sodium hydroxide mixed with 6 g of zinc oxide) were added to the first contact product P2 and at the same time alkali (sodium hydroxide) was added to make the pH The value is 10.5-11, and then the temperature is maintained at 85-90° C. for 100 minutes to obtain the product Q2 of the second contact. The viscosity of the second contacted product Q2 was measured to be 3000 centipoise at 25°C.
[0050] Add 240 grams of filler (camellia oleifera cake from the same source as above...
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