Polyurethane shape memory polymer material synthesis technology

Abstract

The invention discloses a polyurethane shape memory polymer material synthesis technology. The synthesis technology solves the problem that the shape memory polymer material prepared through the prior art has poor shape memory effects, poor water resistance, ventilating and moisture permeability of the product, produces color change after fabric arrangement and has small practical value. The synthesis technology orderly comprises 1, raw material vacuum dehydration, 2, prepolymerization: adding 2, 4-toluene diisocynate and DMF into a reactor in a N2 protective atmosphere and dropwisely adding polyol into the reactor according to a stoichiometric ratio so that a prepolymer is produced, 3, chain extension reaction: carrying out a chain extension reaction process on 1, 4-BDO and dimethylolpropionic acid (DMPA), and 4, neutralization reaction: completely neutralizing carboxyl of the DMPA through triethylamine (TEA) and simultaneously, adding 300-1000ml of water into the reaction system to obtain a solution with a mass concentration of 15-25%.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of a polyurethane shape-memory polymer material. Background technique [0002] The memory polymer material is cross-linked by physical methods such as radiation cross-linking or chemical methods. When the polymer is heated above its melting point, it will no longer melt, but will be in a highly elastic state. Therefore, an external force can be applied to deform it. After cooling in the state, the crystallization pays off and freezes the stress. When reheated above the melting point, the crystal melts, the stress is released, and the material returns to the original shape-forming state, completing a memory cycle. In the current synthesis process of memory polymer materials, the process is not easy to implement, the resulting memory polymer materials have low purity, the reaction residues cannot be recycled, the production process is c...

AI Technical Summary

Problems solved by technology

In the current synthesis process of memory polymer materials, the process is not easy to implement, the resulting memory polymer materials have low purity, the reaction residues cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high, so it is not suitable for large-scale production. mass production