Waterproof and breathable composite membrane with microporous structure and preparation method of waterproof and breathable composite membrane
A waterproof, breathable, microporous structure technology, applied in chemical instruments and methods, flat products, other household appliances, etc., can solve problems such as poor ventilation performance, achieve good waterproof and thermal performance, good mechanical properties and toughness, and comfortable to wear. Effect
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preparation example 1
[0062] The preparation method of polyethylene glycol oxalate glycol, comprises the following steps:
[0063] Step 1, feeding, put 2922.80g of adipic acid, 955.27g of 1,4 butanediol and 1252.60g of 1,6 hexanediol into the reactor with a molar ratio of 2:1.06:1.06 and mix evenly. Then add 2.0g of tetraisopropyl titanate, mix well, and set aside;
[0064] Step 2, heat up to 130.0-135.0°C, and react until water effluent;
[0065] Step 3, the temperature is raised to 220-230°C, and the transesterification reaction is carried out for 2.0 hours;
[0066] Step 4: Detect the acid value of the material in the reactor. When the detected acid value is higher than 25mgKOH / g, continue the transesterification reaction for 10 minutes and then detect the acid value of the material until the acid value of the material is lower than 25mgKOH / g, then start pumping Vacuum the gauge pressure to 0.098MPa, and control the OH-value at 56±3 to obtain polybutylene oxalate glycol with a molecular weight...
preparation example 2
[0068] TPU resin A is composed of MDI, HDI, caprolactone polycarbonate diol with a weight average molecular weight of 2000, polytetrahydrofuran PTMEG with a weight average molecular weight of 2000, 1,4 butanediol, 1,6-hexanediol, Prepared from bismuth octadecanoate, triphenyl phosphite, aluminum hydroxide and calcium stearate.
[0069] The total moles of hydroxyl groups in polytetrahydrofuran PTMEG with a weight average molecular weight of 2000 and the total moles of hydroxyl groups in 1,4 butanediol and 1,6-hexanediol The volume ratio is 1:7. In MDI and HDI, the molar weight of -NCO is that of caprolactone polycarbonate diol with a weight average molecular weight of 2000, polytetrahydrofuran PTMEG, 1,4 butanediol, and 1,6-hexanediol with a weight average molecular weight of 2000. 0.985 times the total molar weight of hydroxyl groups. The molar ratio of 1,4 butanediol to 1,6-hexanediol is 6:1. The molar ratio of MDI to HDI is 19:1.
[0070] For the batching parameters of T...
preparation example 3
[0078]The difference between Preparation Example 3 and Preparation Example 2 is that the molar ratio of MDI to HDI is 9:1.
[0079] The batching parameters of TPU resin A in this preparation example, see the following table:
[0080] raw material Dosage g Diphenylmethane diisocyanate MDI, molecular weight 250.252 1554.06 Hexamethylene diisocyanate HDI, molecular weight 168.17 116.04 Caprolactone polycarbonate diol, molecular weight 2000 1800.00 Polytetrahydrofuran PTMEG, molecular weight 2000 200.00 1,4 butanediol molecular weight 90.12 540.72 1,6-hexanediol, molecular weight 118.17 118.17 Catalyst - bismuth octadecanoate 0.22 Antioxidant: Triphenyl Phosphite 43.29 Flame Retardant - Aluminum Hydroxide 43.29 Lubricant - calcium stearate 30.00
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