Water absorbent resin coating crosslinking agent

Water absorbent resin coating crosslinking agent

The effect of crosslinking agent on the absorbent properties of water absorbent resin is very important, it affects the water absorption rate and the absorption rate of the water absorbent, and it influences the practical application of the water-absorbing agent. Due to the polymerization of the nuclear shell, the resulting particle kernel and the shell have different crosslinking structures.

Found by experiment, crosslinking agent and crosslinking agent B of acrylic resin has good water imbibition crosslinking effect, the crosslinking agent B generated under the action of polymer is hard, good permeability, vast amounts used as coupling agent B resin shell part of the crosslinking agent, dosage of 013% of the shell part of the amount of acrylic monomers.

Crosslinking agent generated under the action of A polymer is soft, water absorption speed, bibulous rate is big, which can be used as A soft core part of the absorbent resin, dosage is the kernel part of the amount of acrylic acid monomer 215 core-shell ratio to determine the shell part of the core-shell type absorbent resin bibulous rate is low, good permeability, and the kernel part of bibulous rate is high, so the reaction of two stages of the choice of the amount of acrylic acid (core-shell ratio) is very important.

If the amount of the shell is too large, the overall absorption rate of the resin is low; If the portion of the kernel is too large, the resin will be soft and the gel will be easy to stick together.

In the same conditions the influence of different core-shell ratio on water absorption performance than product physical properties of core-shell bibulous rate (g/g) hard, slow speed of absorbing water is relatively hard, good permeability, soft and elastic, permeability good soft, poor permeability, bonding is formed through the experiment found that core-shell ratio of 5 b1 absorbent resin which is formed by the overall water absorption performance is best.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


With acrylic acid as main raw materials, in inverse suspension polymerization system, adopting compound with dispersant and two different crosslinking agent, polymerization by stages, synthesis with high internal low crosslinking, external crosslinking soft core shell of core-shell type of superabsorbent resin, water imbibition of the product and good permeability.

Increase the number of pre polymers end base, can improve the resistance to water pressure value of the coated fabric, but its permeability is decreased. This is because the increase the number of pre polymers end groups, improve the effective crosslinking density of the coating, so as to improve the resistance of the coating cloth water pressure value, and moisture transmission caused by the rise of crosslinking density and lower.

Experiment found that HPAN crosslinking agent on the amino end to fat "amino PU crosslinking effects, and to use DEOA introduction of hydroxyl-terminated PU pre polymers crosslinking effect. With EH, HMM etc as crosslinking agent, also found the same situation. This is because when heated, pre polymers hydroxyl-terminated react. The active hydrogen is removed, causing the crosslinking agent, EH, and HMM, which are reactive to the reactive hydrogen reaction.

Using HPAN as crosslinking agent, with a mixture of PEGl000 with PPGl000 as polyol component, including PPG % 70% (mass fraction), according to the n (- NC0) : n (0 h) of 1.7:1 after react with TDI, the proportion of homemade end capping agent of the DK sealing side, the products and water emulsion, get multiterminal amino PU pre polymers water emulsion. After saying a latex mixed with HPAN, get high polymer carboxylic acid ammonium salt form of water-based one-component waterproof moisture permeable PU coating agent emulsion. The coating agent after drying, baking, crosslinking, resistance to water pressure value can be obtained about 6370 pa, every square metre, coated fabric of moisture transmission, 2558 g.

Dry crosslinking: using joined the crosslinking agent polyethylene insulation material, oxygen compounds by three layers co-extrusion complete shield conductor, insulation, insulation shield after extrusion, continuous evenly by crosslinking of high temperature and high pressure nitrogen seal tube to complete the crosslinking process.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com