Hydrophobic copolymer with high peel strength and preparation method thereof
A high-peeling, copolymer technology, applied in the direction of liquid-repellent fibers, fiber treatment, textiles and papermaking, etc., can solve the problems of fabric washing resistance and peeling strength, and achieve excellent waterproof effect and chemical resistance. The effect of excellent product and good chemical resistance
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[0034] In a more preferred embodiment, the high peel strength hydrophobic copolymer of the present invention is, for example, a copolymer prepared by emulsion polymerization. Concrete preparation method comprises the following steps:
[0035] 1) dissolving nonionic emulsifier and cationic emulsifier in water;
[0036] 2) adding the above-mentioned comonomer mixture into the solution of step 1), and making a pre-emulsion under high shear;
[0037] 3) Take about 1 / 3 of the pre-emulsion in step 2) and heat it up to 60-90°C, preferably 65-80°C, add 1 / 3 of the free radical initiator to initiate, and when the temperature of the system remains unchanged, the remaining 2 / 3 The pre-emulsion and 2 / 3 free radical initiator are added dropwise at the same time, and the temperature is kept for 1-5 hours after the dropwise addition, preferably 2-4 hours.
[0038] 4) Cool down to room temperature and collect.
[0039] In a preferred embodiment, the nonionic emulsifier includes C 8 -C 20 ...
Embodiment 1
[0075] Add 3.0g polyoxyethylene lauryl ether (15EO) in the four-neck flask that stirrer, thermometer, reflux condenser are housed, 3.8g octadecyltrimethylammonium chloride stirring is dissolved in 185 grams of deionized water, Raise the temperature to 72°C and stir rapidly, add 25g lauryl acrylate, 22.5g vinyl neononanoate, 12g styrene, and 9.5g 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexyl Mix formate and 4 g of methacrylic acid evenly and drop them into the above-mentioned four-necked bottle, and continue stirring for 1 hour after the dropping to obtain a pre-emulsion. Take the above 88.3g pre-emulsion, keep the temperature at 72°C, add 2.4g of azobisisobutylamidine hydrochloride dropwise at 10% concentration, after the addition is complete, add the remaining 176.5g of pre-emulsion and 4.8g of 10% concentration Initiator, keep warm for 2.5h, and cool down to get fluorine-free water repellent emulsion. The weight average molecular weight of the copolymer was 84,000.
Embodiment 2
[0077] In a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, add 2.0 g of isomeric tridecyl alcohol polyoxyethylene ether (5EO), stir and dissolve 2.5 g of cetyltrimethylammonium bromide in 125 g of In deionized water, heat up to 72°C, stir rapidly, mix 20g of isooctyl acrylate, 18g of vinyl neodecanoate, 10g of divinylbenzene, 7g of vinyl dioxide cyclohexene, and 5g of methacrylic acid, and drop them into the above In the four-neck flask, after the dropwise addition, continue stirring for 0.5 h to obtain a pre-emulsion.
[0078] Take 63g of the above-mentioned pre-emulsion, keep the temperature at 72°C, add 2g of 10% initiator dropwise, after the addition is complete, add the remaining 126.5g of pre-emulsion and the old initiator dropwise when the temperature is stable, keep it warm for 3 hours, and cool down to obtain a fluorine-free water repellent lotion. The weight average molecular weight of the copolymer was 63,000.
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