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Preparation method of salt-tolerant flexible anti-seepage material

A flexible anti-seepage material and salt-resistant technology, which is applied in coatings and other directions, can solve the problems of poor salt resistance of anti-seepage materials, affecting application life, and migration of plasticizers, so as to increase the softening point, reduce the acid The effect of lowering the transition temperature

Active Publication Date: 2018-11-23
四川正大未来建筑科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem mainly solved by the present invention is that the hardness of the current geotechnical material itself is high, and there are undesirable phenomena such as plasticizer migration and hardening during long-term use, which affect its service life, and the salt resistance of anti-seepage materials is generally poor , providing a preparation method of salt-resistant flexible anti-seepage material

Method used

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  • Preparation method of salt-tolerant flexible anti-seepage material

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Embodiment Construction

[0025] In parts by weight, add 80-90 parts of hexamethylene diisocyanate, 30-40 parts of polyether diol, and 20-30 parts of rosin into the three-necked flask, heat up to 80-85°C, keep the temperature for 2-3 hours, and then cool down to 50-60°C, add 10-15 parts of dimethylolpropionic acid, 20-30 parts of glycerin and 20-25 parts of maleic anhydride to the three-necked flask in sequence, and dissolve 3-5 parts of dibutyltin dilaurate in 35 After ~40 parts of acetone, use a constant pressure dropping funnel to drop it into a three-necked flask at a dropping rate of 2~3mL / min, raise the temperature while adding it, control the heating rate at 3~5°C / min, and raise the temperature to 80~82 °C, continue to react for 3-4 hours to obtain anti-seepage slurry; in parts by weight, take 60-70 parts of ethylene-vinyl acetate copolymer, 20-25 parts of expandable graphite, 10-15 parts of EPS foam particles, Put 8-10 parts of vinyl ester resin into a reaction kettle, heat up to 230-250°C, kne...

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Abstract

The invention relates to the technical field of anti-seepage materials, in particular to a preparation method of a salt-tolerant flexible anti-seepage material. The preparation method comprises the following steps: preparing anti-seepage slurry by utilizing polyether glycol, rosin, hexyl diisocyanate, maleic anhydride and the like as raw materials; foaming by utilizing an ethylene-vinyl acetate copolymer, thus preparing a foamed sheet; preparing salt-tolerant polyacrylate emulsion by taking methyl methacrylate and butyl acrylate as monomers; coating two surfaces of the foamed sheet with the salt-tolerant polyacrylate emulsion, thus obtaining salt-tolerant foam; immersing the salt-tolerant foam in the anti-seepage slurry, and drying, thus obtaining the salt-tolerant flexible anti-seepage material. Maleic rosin is utilized for reacting with glycerol to generate modified rosin resin, so that glass-transition temperature of the anti-seepage slurry can be reduced, latex can be used for introducing a non-ionic hydrophilic group to a main chain of foam resin, so that the foam resin has high water absorption capacity; the sensitivity of the foam resin to salt is weaker, and the purpose ofincreasing the slat tolerance of the foam resin can be achieved by reducing the sensitivity of a group on a polymer molecular chain of the foam resin.

Description

technical field [0001] The invention relates to the technical field of anti-seepage material preparation, in particular to a preparation method of salt-resistant flexible anti-seepage material. Background technique [0002] Anti-seepage material is a functional material that prevents liquid substances (such as water) or gaseous substances (such as water vapor) from intruding into the protective structure. It has an anti-seepage effect that cannot be compared with ordinary waterproof materials. The water vapor permeability coefficient of the material can reach 10-12cm / s, so the material is almost impermeable to water. [0003] Anti-seepage materials are widely used in various fields of infrastructure construction in our country, especially in water conservancy projects. Currently, commercially available anti-seepage materials include polyvinyl chloride (PVC) geotechnical materials, high-density polyethylene (HDPE) geotechnical materials, linear low-density polyethylene (LLDP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/40C08L23/08C09D133/12C09D7/61C08G18/66C08G18/48C08G18/34C08G18/64
CPCC08G18/348C08G18/4825C08G18/64C08G18/6692C08J9/365C08J9/40C08J2323/08C08J2433/12
Inventor 陈建峰邓博陈帅
Owner 四川正大未来建筑科技有限公司
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