Analysis Of The Making Method Of White Artificial Leather

< p > IPDI alicyclic isocyanate has excellent weather resistance because of its unique structure and double bond without benzene ring. Its finished product has no yellowing characteristic under long term exposure to sunlight.

Therefore, it is loved by a large number of polyurethane manufacturers.

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< p > with the weather getting warmer, light colored luggage garment leather has gradually become popular. The PU paste made from the reaction of ordinary polyester polyether with MDI and TDI will gradually become yellow after the white artificial leather is made, and the beauty of the product will be lost.

Therefore, the use of IPDI is becoming more and more popular in the manufacture of artificial leather.

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The application of < p > IPDI is generally confined to white artificial leather, and the peak period is generally related to season, around 4 and May each year.

Because white artificial leather is generally required to be as white as possible under the same modulus, it has a high demand for color rendering. Users also hope to produce the most optimal artificial leather with the least slurry.

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< p > 1, polyester polyol < /p >

< p > so in the production of yellowing resistant artificial leather, under the consideration of many factors such as cost developing color, AA+BG synthetic polyester should be the first choice polyol. At the same time, considering the problems of crystallinity and modulus, it is necessary to add other polyols or appropriate molecular weight appropriately.

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< p > two, chain extender, catalyst < /p >

< p > because the reaction activity of IPDI is much poorer than that of MDI and TDI. Therefore, in the selection of chain extender, a part of amine chain extender (if IPDA), all amine chain extender will also affect the cost of products, and also have a corresponding effect on the color rendering.

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< p > T-12 has better catalytic performance than T-9 in the choice of catalyst.

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< p > three, solvent < /p >

< p > the formulation design of yellowing resistant slurry has a general modulus of about 50, which belongs to the middle modulus resin. This part of the polyurethane slurry modulus is not high. Therefore, taking into account the corrosive effect of strong polar solvent DMF on the leather surface, the general DMF dosage will be reduced as appropriate, and should be controlled at about 65%-70%.

(article from global polyurethane net) < /p >

< p > four, selection of additives < /p >

< p > IPDI is alicyclic isocyanate.

The outdoor weathering properties of alicyclic isocyanates are between aromatic and aliphatic isocyanates, but closer to aliphatic diisocyanates.

Therefore, in the products made of IPDI, suitable additives are usually added to prevent yellowing of products.

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< p > this part of auxiliaries, usually ultraviolet absorbers and antioxidants, can achieve the best combination effect.

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