Looking for a water expanding material? 20. Seeking water expansion materials?

Expand the waterstop strip in case of water.

This rubber produces 2-3 times expansion deformation after contact with water, and fills all irregular surfaces, cavities and gaps in the joints, and at the same time generates a huge contact pressure to completely prevent leakage. When the joint or construction joint is displaced, causing the gap to exceed the elastic range of the material, the ordinary rubber water-stopping material loses the water-stopping effect.

The material can also stop water by absorbing water and expanding. The use of water-exposed expansion rubber as a leak plugging sealing and water-stopping material not only saves the dosage, but also can eliminate the characteristics of elastic fatigue caused by excessive compression of general elastic materials, so that the waterproof effect is more reliable.

A kind of water-absorbing and expanding resin is a water-absorbing expanded rubber.

1. Technical field: the present invention belongs to a waterproof material, specifically a kind of water-absorbing intumescent resin and its synthesis method, and the water-inflated rubber prepared by this water-absorbing intumescent resin and its preparation method.

2. Background technology: Expansion and waterproof rubber is a new type of waterproof material, which has a unique waterproof mechanism: on the one hand, it has the elasticity and extensibility of rubber waterproof products, and plays an elastic sealing role; On the other hand, it has the effect of expanding when exposed to water and stopping water with water, and is a functional polymer material with double water-stopping effect.

As far as the international scope is concerned, the development of waterproof materials for water expansion generally depends on the development of expansion agents, that is, water absorption and expansion. In the mid-seventies of the twentieth century, Japan, Europe and the United States and other countries first proposed the idea of using water expansion materials to "stop water with water" in order to solve the problem of leakage in underground engineering, and were quickly accepted and applied by the civil engineering community. In terms of the development of water expansion materials, Japan and Germany are more advanced.

Expanded rubber in case of water can be divided into the following two categories according to different synthesis methods: Mixed type of expanded rubber in contact with water, that is, the expansion rubber prepared by mixing and vulcanizing with expansion agent and rubber, according to the two types of systems with different expansion agents

1. Using water-soluble polyurethane as the expansion agent, the expanded rubber prepared has high strength, no precipitates when soaked in water, and has a long material life, but its disadvantage is that the expansion rate is not high, between 100% and 300%, and the expansion rate in salt water and alkaline water is lower;

2. Commercially available powdered superabsorbent resin is used as the expansion agent. The expansion rate of the obtained material is high, generally in 400% to 600%, or even higher. Example:

A kind of water-absorbing intumescent resin is made of water-absorbing intumescent tree rubber, and its characteristics are: it is composed of water-absorbing intumescent resin, neoprene, filler, softener, promoter and antioxidant, and its weight parts are, water-absorbing intumescent resin is 50 100 parts, neoprene is 100 parts, filler is 20 35 parts, softener is 10 20 parts, accelerator is part, antioxidant is part part; The water-absorbing intumescent resin is polymerized with polymerization monomer, catalyst, initiator and cross-linking agent.

The best formula is: the water-exposed expansion rubber prepared by the above method: it is composed of 100 parts neoprene, part clay, part carbon black, 4 parts magnesium chloride, part zinc oxide, part DM, 1 part DFC part stearic acid and part dizinc ester, and its main properties are as follows: Serial number Item Performance data.

1 hardness (Shore a), degree 54

2 Tensile strength, mpa 5

3 Elongation at break, % 770 4 Permanent deformation at break, % 12 5 Aging coefficient 70 96h 6 Expansion rate % Distilled water NaOH solution (pH=12) HCl solution (pH=5) 1% NaCl solution.

When it swells in water, the water stop strip can expand rapidly when it encounters water.

The water-swelling waterstop is a unique new type of rubber product, which is a general term for putty-type waterstop and product-type waterstop with water-absorbing and swelling properties.

When exposed to water, the rubber expands and deforms by a factor of two to three, filling all the irregular surfaces, holes and crevices of the joints, creating a huge contact pressure and completely preventing leakage.

Summary. It will expand, but the expansion line in the middle will expand when exposed to water.

The water-swelling rubber waterstop is in the waterproof area of the ordinary rubber waterstop, and the water-proof expansion line (thinner water-swelling waterstop strip) is added, so in addition to the performance of the ordinary rubber waterstop, its expansion line also has the characteristics of water-swelling.

Does a material that swells when exposed to water still swell under water pressure?

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<> will expand, but the middle attack water expansion line will expand water expansion rubber waterstop is in the waterproof area of the ordinary rubber waterstop, Zeng's hand brother added the water expansion line (thinner water expansion water stop), so it has the performance of the ordinary rubber waterstop potato ruler, its expansion line also has the characteristics of water expansion.

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Expand the waterstop strip in case of water.

Find out what kind of material this is.