Anti-curling low-solidification-rate PU resin and preparation method thereof

Abstract

The invention relates to an anti-curling low-solidification-rate PU resin and a preparation method thereof. The preparation method comprises the steps: 1, adding polyester polyol into a reaction kettle, adding phosphoric acid, an antioxidant, a dihydric alcohol chain extender and N, N-dimethylformamide, and stirring and mixing the mixture uniformly; 2) adding isocyanate, heating the mixture to 75-80 DEG C, and carrying out a tackifying reaction until the viscosity of the system reaches 200,000-240,000 cps / DEG C; and 3) after the tackifying reaction, adding methanol to terminate the tackifyingreaction, then adding malic acid, stirring the mixture for 1h, and discharging the product. The preparation method provided by the invention adopts a one-step method, the synthesis process is simple and convenient, the prepared PU resin has good resilience, and the PU wet base prepared from the PU resin has the functions of edge curling prevention and low solidification rate.

Description

technical field [0001] The invention relates to the field of PU resin preparation, in particular to an anti-curling low solidification rate PU resin and a preparation method thereof. Background technique [0002] The resin for PU leather has been widely sought after by people in recent years because of its wide source of raw materials, low price, multi-function and hand feeling not inferior to genuine leather. Resin for PU leather can be divided into wet method and dry method resin. Wet method resin is to mix PU resin with wood powder, calcium powder and other fillers and disperse evenly at high speed, apply it on the surface of the base fabric, then solidify it in water, and dry it under pressure. And so on, you can make a wet bass. The main physical properties of wet bass are: resilience, thickness, peel strength, fullness, softness, Q elasticity, cell structure and solidification rate, etc. Add a small amount of color chips to the dry process resin, mix it into the DMF ...

AI Technical Summary

Problems solved by technology

When the solidification rate is fast, the wet-laid bass is easy to curl (and a whole piece of cloth with warped edges), which hinders the next operation. At this time, it needs to be ironed at high temperature. If the wet-laid bass It may take 4-5 times of high-temperature ironing for severe curling, which greatly wastes the manpower and material resources of the synthetic leather factory.

There are also various anti-curling additives in the market. In the experiment, we found that after adding these anti-curling additives to the synthetic resin, the hand feel of the synthetic leather became softer, the surface luster became darker, and the pores The structure has also become much larger

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