Crosslinking agent crosslinking process

Crosslinking agent crosslinking process

Basic principle of microwave technology, familiar to everyone, but it is worth remembering is composed of hydrogen and carbon materials daily aggregate materials by microwave heating.

We in polyethylene, polypropylene, polystyrene, natural rubber and polyisoprene, SBR, epdm rubber, butyl rubber, polybutadiene, such as, for example, in order to be able to apply the technology, it is necessary to add a considerable amount of (weight ratio is 10% - 50%) under microwave heating material, such as:

1) 2) metal powder carbon black (careful burning dangerous) 3) surface treatment of silica 4) strong magnetic and magnetic powder with 5) barium and lead zirconate titanate salts and height of 6) accidentally polarization of organic esters, phthalates and carboxylic acid esters (7) polyoxyethylene glycol ethers and esters 8) amine

Another approach is to use a small number of catalysts (0.2 to 1%). Experts describe the use of reactive catalysts, increasing the speed at which multiple chemical reactions, including crosslinking, are increased (more than four times). These catalysts, under microwave conditions, generate the intermediates of microwave sensitivity, but are inert in the absence of microwaves.

Application examples are epoxy resins solidified by amines, anhydride and carboxylic acid. The crosslinking of silicone elastomer and epoxy rubber; The sulphur of unsaturated rubber; Peroxide sulfide; The solidification of unsaturated polyester resin, allyl carbonate and allyl phthalate resin.

By contrast, other polymers such as polyoxymethylene, plasticization of PVC, neoprene, nitrile rubber, acrylic rubber (class), and so on can be directly by microwave treatment.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


Range of application

The crosslinking agent is mainly used in acrylic emulsion, polyurethane emulsion, carboxylic butyl benzene emulsion, etc., to improve the adhesion strength and surface adhesion of emulsion.

Apply to the following areas: water-based acrylic pressure sensitive adhesive, water-based acrylic adhesive, water-based acrylic coating, water-based acrylic leather coating agent, etc.

Crosslinking agent content determination. To accurately call the solid sample about 0.2 g, put in a clean and dry 100-150ml iodine bottle, add sodium bicarbonate 1.0 g, solid iodized potassium 2.0 g, ice acetate 10mL, shake well. With clamp of condenser pipe iodine bottle, 65 ℃ constant temperature water bath, and slowly add 3.0 mL of hydrochloric acid, and while carefully vibration wave, to only a small amount of air bubbles inside solution, light cover the cork again, let stand for 15 ~ 20 min, add 50 mL distilled water and immediately with 0.1 mol/L sodium thiosulfate solution titration to pale yellow, then add 10 drops of indicator, starch continue titration to blue disappears, is the end. Do the same procedure but do not add hydrochloric acid to the blank test.

Determination of melting point. The universal method is measured by GB 617-88 "melting point range."

In the past, the commonly used crosslinking agent in pigment printing and dyeing dyes is a problem of formaldehyde, so it has been developed in recent years to develop low formaldehyde and non-formaldehyde products. Low formaldehyde crosslinking agent has Acrofix ML, Acrofix UC03, Acrofix CA46069, etc. Developed cryogenic crosslinking agent, LE 780, is an unformaldehyde crosslinking agent.

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