Artificial leather manufacturing method adopting TPU (thermoplastic urethane) to plasticize PVC (polyvinyl chloride) and reducing use of plasticizer

Abstract

The invention discloses an artificial leather manufacturing method adopting TPU (thermoplastic urethane) to plasticize PVC (polyvinyl chloride) and reducing use of a plasticizer. According to the method, 80-90 parts of PVC powder, 3-5 parts of a stabilizer, 50-60 parts of the plasticizer, 10-20 parts of TPU, 2-3 parts of a foaming agent, 5-10 parts of filler and an appropriate quantity of a colorant are mixed uniformly, and an artificial leather product is prepared with a traditional calendering process. PVC and TPU are all polar macromolecules and have good compatibility; the TPU macromolecules contain both soft segments and hard segments, the elasticity modulus of the TPU macromolecules is between that of plastics and that of rubber, the TPU macromolecules can still keep better elasticity in a relatively wide temperature range and further have good performance of low-temperature resistance, solvent resistance, heat resistance and the like; when the TPU is used for plasticizing PVC, the glass-transition temperature of a PVC/TPU blended material is reduced remarkably, the heat resistance is improved, and 30%-40% of the use quantity of a micromolecular plasticizer can be reduced; TPU adopts the macromolecules, is not easy to transfer and has lasting plasticizing effect; besides, polar groups such as epoxy groups, ester bonds and the like in the plasticizer and urethane groups in the TPU macromolecules can form a hydrogen bond or dipole interaction, and accordingly, the transference resistance of the plasticizer is further improved.

Description

technical field [0001] The invention belongs to the field of artificial leather manufacturing, and in particular relates to a method for manufacturing artificial leather by using TPU to plasticize PVC and reducing the use of plasticizers. Background technique [0002] Polyvinyl chloride (PVC) ranks second in the use of polymer materials, mainly because of its excellent performance and low price, but because of its lack of notch impact resistance, processability, thermal stability, etc., PVC must be For toughening modification, add a large amount of plasticizer. Among them, when making soft PVC artificial leather, the mass ratio of PVC to plasticizer is as high as 1: (0.8~1.0). At present, phthalate plasticizers are used in the largest amount and have the most varieties. Studies in recent years have shown that phthalate plasticizers are toxic and carcinogenic when they enter the human body in large doses. Therefore, developed countries such as Europe and the United States ...

AI Technical Summary

Problems solved by technology

However, due to the complex process of synthesizing the reactive plasticizer and the use of a large amount of toluene in the synthesis process, it is not suitable for increasingly stringent environmental protection requirements

There are also reports of improving processing performance and migration resistance by blending PVC with polymers such as polyethylene oxide (PEO), but this type of polymer has poor compatibility with PVC, is prone to phase separation, and has limited plasticizing efficiency. Further improve

Environmentally friendly plasticizers such as vegetable oil-based plasticizers and citric acid ester plasticizers have the advantages of good compatibility, high plasticizing efficiency, non-toxicity, and low volatility, but they are easier to precipitate than DOP when used, and have better migration resistance. worse