A preparation method of halogen-free flame-retardant phenolic laminated paperboard
A technology of phenolic laminated cardboard and phenolic resin, applied in chemical instruments and methods, paper/cardboard layered products, layered products, etc., to achieve good punching and shearing properties and electrical properties, low water absorption, and good flame retardancy Effect
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Embodiment 1
[0023] 94g of phenol and 22.11g of aqueous formaldehyde solution (37wt%) were added to the reactor in turn, then 0.19g of p-toluenesulfonic acid was added, the temperature was raised to 98-100°C for 40min, and then 1g of ammonia water and 66.33g of aqueous formaldehyde were added to the system in turn. , 0.6g guanidine carbonate, 30g tributyl phosphate, heat up to 65~70℃ and react for 1.5h, finally add 33.17g formaldehyde solution to this system, react at 98~100℃, when the gel time at 160℃ is 170~200s Vacuum dehydration is carried out in between, and after the dehydration is completed, methanol is added to reduce the temperature to obtain phosphorus-containing phenolic resin. The bleached wood pulp paper was impregnated with the resin to make a laminated paperboard. The number of the board was 1#. The performance test results are shown in Table 1.
Embodiment 2
[0025] 94g of phenol, 28.2g of xylene aldehyde, and 6g of paraformaldehyde were added to the reactor in turn, then 0.28g of p-toluenesulfonic acid was added, the temperature was raised to 100-105°C for 1 hour, and then 2.3g of triethylamine was added to the system. , 27g paraformaldehyde, 0.8g guanidine carbonate, 30g triethyl phosphate, heat up to 73~75℃ and react for 1.5h, finally add 9g paraformaldehyde to this system, react at 98~100℃, when 160℃ gel The reaction was stopped when the time was between 150 and 180 s, and methanol was added to reduce the temperature to obtain a phosphorus-containing phenolic resin. The bleached wood pulp paper was impregnated with the resin to make a laminated paperboard. The number of the board was 2#. The performance test results are shown in Table 1.
Embodiment 3
[0027] 94g of phenol, 14.1g of xylene aldehyde, 6g of paraformaldehyde were added to the reactor successively, then 0.22g of p-toluenesulfonic acid was added, the temperature was raised to 95-100°C for 40min, and then 1.7g of triethanolamine, 1.7g of triethanolamine, 27g paraformaldehyde, 0.94g guanidine carbonate, 20g trimethyl phosphate, 14.1g polyethylene glycol 400, heat up to 70~75℃ and react for 1h, finally add 9g paraformaldehyde to this system, react at 98~100℃ , when the gel time at 160°C is between 140 and 170 s, the reaction is stopped, and methanol is added to reduce the temperature to obtain a phosphorus-containing phenolic resin. The bleached wood pulp paper was impregnated with the resin to make a laminated paperboard. The number of the board was 3#. The performance test results are shown in Table 1.
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