Polyurethane potting glue for household water purification hollow fiber membranes, and preparation method thereof

Abstract

The invention discloses a polyurethane potting glue for household water purification hollow fiber membranes, wherein the polyurethane potting glue comprises two components A and B, wherein the component A is the mixture of a variety of polyols, the component B is one or a variety of polyol modified isocyanate prepolymers, and during the use, the component A and the component B are mixed accordingto a weight ratio of 100:50-100. According to the present invention, the polyurethane potting glue has the following advantages that the mixing viscosity is moderate, the polyurethane potting glue easily infiltrates most of hollow fiber membrane filaments, and the glue extending is not easily generated; the hardening and the strength of the glue are high after the curing, the adhesion to the ABS shell is strong, and the water hammer simulation test results show that the problems of cracking, separation from the shell and the like are not generated; the curing rate is moderate, and the cured filtering core end head can be cut within 2 h in the case of the operable time of 20-25 min; and the problems caused by the use on the water filtering core product can be solved, and the quality of thewater filtering core product and the production efficiency can be improved.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a polyurethane potting glue for household water purification hollow fiber membranes and a preparation method thereof. Background technique [0002] With the increasingly serious pollution of water sources and the improvement of people's living standards, the requirements for household water purification are getting higher and higher, and ultrafiltration membrane purification technology is currently one of the mainstream technologies for purifying drinking water. Ultrafiltration membrane purification technology adopts high-precision pure physical filtration principle, high filtration precision, can intercept rust, bacteria, microorganisms and other impurities in water, and retain trace elements and minerals needed by the human body. It only needs to rely on the pressure of tap water itself to achieve filtration. It has the characteristics of simple installation, large water flux, safety, e...

AI Technical Summary

Problems solved by technology

[0006] However, most of the polyurethane potting adhesives currently on the market have the following problems: (1) Because the potting viscosity is not easy to control, either the viscosity is too thick and the infiltration of the hollow fiber membrane is not complete, or the viscosity is too thin and the membrane is easy to climb. (2) The adhesive force of the cured colloid to the ABS shell is weak, and it is easy to separate from the ABS shell when the end is cut, or when the water hammer test is performed on the water filter element, the colloid is impacted by an external force. But cracking, falling off, can not pass the test; (3) due to the curing speed of polyurethane encapsulants, the operation time is long, the post-curing (hardness increase) time is also long, the operation time is short, and the post-curing (hardness increase) time is also short Therefore, in practical applications, there will be too long a waiting time for cutting the end when the required operating time is reached, and the contradictory problem that the operating time is too short to achieve a faster cutting time.

The above problems have seriously affected the product quality and production efficiency of the water filter element, and greatly reduced the use effect of the household water filter element.

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