Anti curling low solidification rate pu resin and preparation method thereof

Abstract

This case involves an anti-curling low solidification rate PU resin and its preparation method. The preparation method includes: 1) adding polyester polyol to the reaction kettle, adding phosphoric acid, antioxidant, glycol chain extender and N, N-dimethylformamide, stirring and mixing; 2) adding isocyanate, heating up to 75-80°C for viscosity-increasing reaction until the viscosity of the system reaches 20-240,000 cps; 3) adding methanol to terminate the viscosity-increasing reaction, Then add malic acid, and discharge after stirring for 1h. The preparation method of this case adopts a one-step method, and the synthesis process is simple and convenient; the prepared PU resin has good resilience performance, and the PU wet-process bass made of it has the functions of anti-curling 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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