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TPU membrane material for sewage treatment aeration and preparation method thereof
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A sewage treatment and aeration technology, applied in water/sludge/sewage treatment, water aeration, sustainable biological treatment, etc., can solve problems such as limited anti-aging performance, short life of diaphragm materials, and poor corrosion resistance. To achieve the effect of superior performance of the finished product, high success rate, improved strength and efficiency
Inactive Publication Date: 2020-09-11
北京得世达环保科技有限公司
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[0009] The purpose of the present invention is to provide a TPU diaphragm material for sewage treatment aeration and its preparation method, to solve the problem of short life, complicated preparation, high cost, poor toughness, poor wear resistance and anti-aging performance of the diaphragm material used for aeration at the present stage Technical issues with limited, poor corrosion resistance
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Embodiment 1
[0042] The synthesis process of TPU materials is divided into bulk polymerization and solution polymerization. In bulk polymerization, it can be divided into pre-polymerization method and one-step method according to whether there is pre-reaction. The prepolymerization method is to react diisocyanate and macromolecular diol for a certain period of time, and then add a chain extender; the one-step method is to simultaneously mix and react diisocyanate, macromolecular diol and chain extender to form TPU. Solution polymerization is to dissolve diisocyanate in solvent first, then add macromolecular diol to make it react for a certain period of time, and finally add chain extender to generate TPU.
[0073] Thin-walled tube 112: holes are uniformly opened on the surface, and the single hole is a straight long hole with a length of 1 mm and a hole density of 10,000 holes / m.
[0074] characteristic unit value Detection method hardnessShore A 80 GB2411-80 density g / cm 3
Embodiment 3
[0076] Pure MDI: (HDO+BDO) molar ratio is 2:5;
[0077] The molar ratio of (HDO+BDO) to malonic acid is 1.2:1;
[0078] The molar ratio of HDO to BDO is 9:1.
[0079] The dosage of antioxidant 1076 is 0.1%;
[0080] The dosage of auxiliary antioxidant 168 is 0.1%;
[0082] Thin-walled tube 112: holes are uniformly opened on the surface, and the single hole is a straight long hole with a length of 1 mm and a hole density of 10,000 holes / m.
[0083] characteristic unit value Detection method hardnessShore A 85 GB2411-80 density g / cm 3
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Abstract
The invention discloses a TPU membrane material for sewage treatment aeration and a preparation method of the TPU membrane material. The TPU membrane material is prepared from malonic acid, 1, 4-butanediol, 1, 6-hexanediol, diphenylmethane diisocyanate, antioxidant 1076, auxiliary antioxidant 168 and chain extender DDM. The molar ratio of the diphenylmethane diisocyanate to the (1, 6 hexanediol and the 1, 4-butanediol) is 2: (4-6), wherein the molar ratio of (1, 6 hexanediol and 1, 4-butanediol) to malonic acid is (1-1.3): 1, the molar ratio of the 1, 6-hexanediol to the 1, 4-butanediol is (8-10): 1. The preparation method is simple, high in success rate and controllable in cost. The tensile strength, the elongation at break, the disturbance cracking resistance and the rebound resilience are effectively improved, and meanwhile, the ventilation capacity and the oxygentransfer efficiency in sewage after mechanical trepanning are improved. The finished product of the TPU membrane material is excellent in performance. By adopting the method, the ratio of hexanediol polypropionate glycol is properly adjusted, and the strength and the efficiency of the prepared aeration membrane for sewage treatment are improved.
Description
technical field [0001] The invention relates to the technical field of environmental protection, in particular to a TPU diaphragm material for sewage treatmentaeration and a preparation method thereof. Background technique [0002] TPU (Thermoplastic polyurethanes) is called thermoplasticpolyurethaneelastomer rubber. It is mainly divided into polyester type and polyether type. It has a wide range of hardness (60A-85D), wear resistance, oil resistance, transparency and good elasticity. It is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Halogen-free resistance Burning TPU can also replace soft PVC to meet environmental protection requirements in more and more fields. [0003] TPU film is a thermoplasticelastomer. In fact, on the basis of TPU pellets, it is made into a film by calendering, casting, film blowing, coating and other processes. It has the advantages of being non-toxic and degradable. The high temperature resi...
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