Low-cost synthesis method of rosin modified phenolic resin
A technology of rosin modification and phenolic resin, which is applied in the field of synthesis of low-cost rosin modified phenolic resin, can solve the problems of poor quality and high cost, and achieve the effect of good quality, low cost and quality assurance
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Embodiment 1
[0019] The low-cost synthesis method of rosin-modified phenolic resin proposed by the present invention includes the following steps:
[0020] S1: Weigh 4-n-propyl phenol and place it in a rapid reaction kettle. When 4-n-propyl phenol is solid, heat it until it melts; then add catalyst and formaldehyde, stir, and then react at 60°C for 2 hours. Prepare resole phenolic resin;
[0021] S2: Weigh the rosin, heat it until it melts, then add the resole phenolic resin prepared by S1, and react at 230°C for 6 hours;
[0022] S3: Weigh the vegetable oil, heat it to melt, then add it to S2, and react at 230°C for 6 hours;
[0023] S4: Add polyol to the mixture obtained by the S2 reaction. The added amount of polyol is 4% of the weight of rosin in S2. The esterification reaction is carried out at a temperature of 260°C. The reaction time is 11 hours, and then the low boiling point is removed under vacuum. Small molecule substance, rosin modified phenolic resin is prepared.
[0024] In the prese...
Embodiment 2
[0026] The low-cost synthesis method of rosin-modified phenolic resin proposed by the present invention includes the following steps:
[0027] S1: Weigh 4-n-propyl phenol and place it in a rapid reaction kettle. When 4-n-propyl phenol is solid, heat it until it melts; then add catalyst and formaldehyde, stir, and then react at 65°C for 2.5 hours. Prepare resole phenolic resin;
[0028] S2: Weigh the rosin, heat it until it melts, then add the resol phenolic resin prepared by S1, and react at 245°C for 7.5 hours;
[0029] S3: Weigh the vegetable oil, heat it to melt, then add it to S2, and react at 245°C for 7.5 hours;
[0030] S4: Add polyol to the mixture obtained by the S2 reaction. The added amount of polyol is 5% of the weight of rosin in S2. The esterification reaction is carried out at a temperature of 300°C. The reaction time is 15.5 hours, and then the low boiling point is removed under vacuum. Small molecule substance, rosin modified phenolic resin is prepared.
Embodiment 3
[0032] The low-cost synthesis method of rosin-modified phenolic resin proposed by the present invention includes the following steps:
[0033] S1: Weigh 4-n-propyl phenol and place it in a quick reaction kettle. When 4-n-propyl phenol is solid, heat it until it melts; then add catalyst and formaldehyde, stir, and then react at 70°C for 3 hours. Prepare resole phenolic resin;
[0034] S2: Weigh the rosin, heat it until it melts, then add the resole phenolic resin prepared by S1, and react at 260°C for 9 hours;
[0035] S3, weigh the vegetable oil, heat it until it melts, then add it to S2, and react at 260°C for 9 hours;
[0036] S4: Add polyol to the mixture obtained by the S2 reaction. The added amount of polyol is 6% of the weight of the rosin in S2. The esterification reaction is carried out at a temperature of 340°C. The reaction time is 20 hours, and then the low boiling point is removed under vacuum. Small molecule substance, rosin modified phenolic resin is prepared.
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Abstract
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