Water Swelling Rubber And Preparation Method Thereof

2008/8/11 9:55:00 41808

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The invention relates to a water swelling rubber prepared by water swelling resin and a preparation method thereof. The technical field belongs to a waterproof material, in particular to a water swelling resin and a synthetic method thereof, and a water swelling rubber prepared from the water swelling resin and the preparation method thereof.

Two. Background technology, water expansion and water stop rubber is a new type of waterproof material. It has unique sealing mechanism: on the one hand, it has the elasticity and extensibility of rubber waterproof products, and plays an elastic seal role; on the other hand, it has the function of water expansion and water stopping; it is a functional polymer material with double water stopping function.

Internationally speaking, the development of water swelling waterproof materials depends largely on the development of expansion agents, i. e. swelling of water.

Water swelling rubber waterproofing materials first appeared in the middle of 1970s. In order to solve the leakage problem of underground works, Japan, Europe and the United States first proposed the idea of using water expansion material to stop water by water, and quickly accepted and applied by civil engineering circles.

The development of water expansion materials is more advanced in Japan and Germany.

Water swellable rubber can be divided into two types according to their synthetic methods: mixing type water swelling rubber, that is, expanded rubber and rubber vulcanization, vulcanized rubber, two different systems according to expansive agents: 1, water-soluble polyurethane as expansion agent, the expanded rubber strength is high, no precipitates are found in water immersion, and the material has long service life. However, its disadvantage is that the expansion rate is not high, and the expansion rate is low between 100%~~300%, and the expansion ratio in saline and alkaline water is lower. 2, the commercially available powdered super absorbent resin is used as expansion agent.

The material has high expansion rate and can generally be 400%~600% or even higher.

Example: a water swelling tree rubber made from water swelling resin is characterized by its water swelling resin, neoprene rubber, filler, softener, accelerant and antioxidant. Its weight content is that water swelling resin is 50~100 parts, chloroprene rubber is 100 parts, filler is 20~35, softener is 10~20, accelerator is 0.5~1.0, antioxidant is 0.5~1.0, the water swelling resin is polymerized monomer, catalyst, initiator and crosslinking agent.

The best formula is: water swelling rubber prepared by the above method: made up of 100 chloroprene rubber, 23.9 clay, 6.1 carbon black, 4 magnesium chloride, 0.8 parts DM, 1 DFC-34, 4 stearic acid and 12.5 two zinc ester, its main properties are as follows: item number item performance data 1 hardness (Shao A), degree of 1 tensile strength, Mpa Mpa elongation at break,% elongation breaking permanent deformation,% aging coefficient, A 96h expansion ratio, distilled water NaOH solution (PH=12) HCl HCl solution (PH=5) 1%NaCl 1%NaCl solution.