A kind of anti-tear phenolic resin and preparation method thereof
A phenolic resin and tear-resistant technology, which is applied in the field of tear-resistant phenolic resin and its preparation, can solve the problems of lignin and rubber compatibility restricting industrial applications, performance impact is not great, lignin cost rises, etc. Achieve obvious effect of hardening and anti-tearing, improve mechanical processing performance, and increase resin yield
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[0028] The preparation process of tear-resistant phenolic resin of the present invention comprises the following steps:
[0029] (1) Mix phenol, acid catalyst and lignin evenly, pretreat at 100-300°C for 2-4 hours;
[0030] (2) Add turpentine to the reaction mixture obtained in step (1), and react at 120-150°C for 1.5-2.5 hours;
[0031] (3) Adding aldehyde to the reaction mixture obtained in step (2) for condensation reaction to obtain the phenolic resin.
[0032] After the reaction is completed, the temperature is raised for dehydration, and the vacuum is evacuated to the required free phenol content to obtain a resin product.
[0033] Wherein, when the acidic catalyst is p-toluenesulfonic acid or sulfamic acid, after step (3) in the preparation method is completed, base is firstly added to the reaction mixture to neutralize the acidic catalyst, and then the temperature rise, dehydration and vacuum pumping operation are performed.
Embodiment 1
[0035] Put 100g of phenol into a four-necked flask, under reflux, add 2g of p-toluenesulfonic acid, stir evenly, add 20g of lignin, heat up to 150°C, and react at constant temperature for 3h; cool down to 80°C, add 10g of turpentine, and heat up to 135°C ℃ reaction for 2 hours; lower the temperature to 90 ℃, dropwise add 60g of formaldehyde with a mass fraction of 37%; p-toluenesulfonic acid; heat up to 160°C for dehydration, vacuumize to a relative vacuum of -0.098Mpa, remove free phenol, and obtain a resin product.
[0036] The index of the resin: the molecular weight (Mw) measured by gel chromatography is 1452, the free phenol is measured by the gas phase method is 0.67, and the carbon residue rate at 800°C is 55.3% when mixed with urotropine at a mass ratio of 2:8.
Embodiment 2
[0038] Put 120g of phenol into a four-neck flask, under reflux, add 4g of oxalic acid, stir evenly, add 30g of lignin, heat up to 130°C, and react at constant temperature for 4h; cool down to 80°C, add 15g of turpentine, and heat up to 120°C for 2h ; Cool down to 90°C, add dropwise 68g of formaldehyde with a mass fraction of 37%; of phenol to produce resin products.
[0039] The index of the resin: the molecular weight (Mw) measured by gel chromatography is 1439, the free phenol measured by the gas phase method is 0.71, and the carbon residue rate at 800°C is 54.7% when mixed with hexamethamine at a mass ratio of 2:8.
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