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Production Technology Of PUS Polyurethane Emulsion Leather Finishing Agent

2008/10/23 17:55:00 41896

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1.主要原料及规格

Toluene diisocyanate (TDI) industrial products

Polycaprolactone industrial products

Two lauric acid two butyl ester reagent

Polyether industrial products

Ethylene glycol industrial products

Acetone industrial distilled water industrial products

Ethylenediamine sodium industrial products

2.生产配方

Toluene diisocyanate 49

Polycaprolactone 35

Polyether 50~70

Ethylene glycol 22

Ethylenediamine acrylic acid sodium 20~30

Distilled water 600

Two lauric acid two tin tin a little

Acetone in moderation

3. main production equipment

With anchor stirrer and jacket heating enamel (stainless steel) polymerization kettle, emulsification kettle, mixing stirred jacket distiller, vacuum pump, high position metering drop tank, condenser, receiver slot and so on.

4.生产操作方法

In the stirred tank with stirred and reflux condensate, put polycaprolactone 34kg, TDI48.4kg, two lauric acid two tin and a little, at 55~60 degrees Celsius, react 2.5h, add acetone, polyether, ethylene glycol, react 1.5h, add ethylenediamine acrylate, continue to react 1H, add strong distilled water under strong mixing, and emulsify to show blue light emulsion, remove acetone under decompression, get qualified products.

5.术指标分析方法

5.1 visual inspection method is used to observe the presence of mechanical impurities and coagulants in polyurethane emulsion. The quality of polyurethane emulsion can be directly observed. The method is simple and feasible.

2 the solid content of polyurethane emulsion drying temperature is 105 + 2 C, time is 4h, temperature is too low or time is short, water can not fully volatilized or time is too long will cause film oxidation and weight gain or weightlessness, will ultimately affect the accuracy of the determination results.

Determination of 5.3H value pH value of polyurethane emulsion can be measured by pH test paper or potentiometer.

From a large number of experiments, it was found that the pH value of the same anionic polyurethane emulsion was measured at 7 with pH test paper, and the pH value measured by potentiometer was between 7.6 and 8.6. So it can be seen that the pH test paper was fast, but the error was relatively large. Because the value of pH in the finishing formula will directly relate to the compatibility of polyurethane emulsion with other auxiliaries and the stability after compatibility, the potential difference meter method was finally applied.

5.4 the determination of the particle size is called 0.5g in the beaker, with a glass rod dropping one drop on the loading film and magnifying 500~600 times with a 1500 fold microscope to determine 5 points.

At the 5 points, there are 5 identical 2 points of the largest particle, and the maximum diameter is the result of determination.

5.5 of the samples were taken 250ml in the bottle and sealed for half a year. No change was observed in 1a.

6.性能

The product is cross-linked polyurethane water emulsion, anionic.

The emulsion has good film-forming property, strong covering power and good adhesion. After finishing, leather and accessories have thin coating, soft and plump handle, smooth and smooth grain, bright and natural, strong leather sense, and improved scratch resistance, dry and wet rubbing, flexural resistance, solvent resistance and weathering resistance.

7. uses

It is suitable for all kinds of leather finishing, especially for garment leather finishing.