A kind of chlorine-free wet strength agent and preparation method thereof
A technology of wet strength agent and ether solvent, which is applied in the field of chlorine-free wet strength agent and its preparation, can solve the problems of poor paper wet strength effect, poor retention performance, wet strength and waterproofing, etc., to improve wet strength , good waterproof performance, enhanced water resistance
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[0022] A kind of preparation method of chlorine-free wet strength agent of the present invention, comprises the following steps:
[0023] 1) According to 20-30:3-5:5-10, take polyvinyl polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer; The aliphatic vinyl monomer is added dropwise to the polyethylene polyamine respectively, and the dropping time is about 2-3 hours. After the dropping is completed, the reaction is continued for 1-2 hours to obtain component A.
[0024] 2) Mix epoxy resin and ether solvent according to 1:1-1.5 (including 20-30 parts of epoxy resin), and add it dropwise to component A at 40-60°C, and the dropping time is about 1- 3h, after dropping, continue to keep warm for 1-2h. Component B is obtained.
[0025] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether according to the ratio of 1-5:4-15 (including 0.5-3 parts of isocyanate), and then add it dropwise to component B, and the dropping time is about 0.5 -1h, con...
Embodiment 1
[0036] 1) According to 20:3.5:6, take polyethylene polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer; at 50°C, drop the cationic monomer and long-chain aliphatic vinyl monomer separately Add it to polyethylene polyamine, add it dropwise for about 2 hours, and continue to react for 1.5 hours after the drop is completed, to obtain component A.
[0037] 2) Mix epoxy resin and ether solvent at a ratio of 1:1 (including 20 parts of epoxy resin), and add it dropwise to component A at 50°C for about 2 hours. After dropping, continue the heat preservation reaction 1.5h. Component B is obtained.
[0038] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether evenly according to the ratio of 1:5 (including 1 part of isocyanate), and then add it dropwise to component B for about 0.5 hours. After dropping, continue React for 1 h, and then dilute with deionized water to a mass fraction of 20%, to obtain component C.
[0039]5) Raise the temperature o...
Embodiment 2
[0041] 1) Take polyethylene polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer at a ratio of 25:4:10; at 60°C, drop the cationic monomer and long-chain aliphatic vinyl monomer separately Add it to polyethylene polyamine, add it dropwise for about 3 hours, and continue to react for 1.5 hours after the drop is completed, to obtain component A.
[0042] 2) Mix epoxy resin and ether solvent according to 1:1.25 (including 25 parts of epoxy resin), and add it dropwise to component A at 60°C for about 2.5 hours, and continue to keep warm after dropping Reaction 1h. Component B is obtained.
[0043] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether according to the ratio of 3:11 (including 2 parts of isocyanate), and then add it dropwise to component B. The dropping time is about 0.6h. After dropping, continue React for 2 hours, then dilute with deionized water to a mass fraction of 25%, to obtain component C.
[0044] 5) Raise the temperatu...
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