3results about How to "Fast vulcanization" patented technology

This invention discloses a branched polyethylene and its preparation method. The preparation method of the branched polyethylene of this invention includes the following steps: using an α-diimine nickel catalyst as shown in formula (1) as the main catalyst; using at least one selected from aluminoxane, modified aluminoxane, alkylaluminum, alkylaluminum hydrolysate, haloalkylaluminum, arylboron, alkylboron and borate as a co-catalyst, polymerizing ethylene using a polymerization solvent containing a halogenated organic solvent under the conditions of a polymerization reaction temperature of 60-85℃ (preferably 65-70℃) and a polymerization pressure of 0.2 to below 1.2 MPa (preferably 0.3-1.0 MPa) to obtain branched polyethylene. Compared with traditional EPDM, the branched polyethylene of this invention exhibits rapid vulcanization and a significantly shortened T90.

This invention discloses a method for preparing a long-lasting stain-resistant fabric, relating to the field of fabric technology. The long-lasting stain-resistant fabric prepared by this invention comprises, from the inside out, Lycra fabric, foamed rubber, and a stain-resistant film. The stain-resistant film is prepared by reacting hyperbranched polyglycidyl ether with modified cyclodextrin. The modified cyclodextrin is obtained by grafting a hydroxylamine polymer onto mercapto-carboxymethyl-cyclodextrin, which enhances stability and introduces a large number of hydroxyl groups, enhancing hydrophilicity and giving the fabric stain resistance. It also increases the density of the stain-resistant film, thereby enhancing the fabric's tear resistance. The foamed rubber is prepared by vulcanizing and foaming a blend of chloroprene rubber, polyurethane rubber, and fluorinated polyether nitrile. The addition of polyurethane rubber accelerates the vulcanization speed and improves the tear resistance of the foamed rubber. It also tightly bonds the Lycra fabric, foamed rubber, and stain-resistant film, enhancing the fabric's peel strength and extending its service life.

The application relates to the technical field of rubber preparation, and discloses a multi-component copolymer, a preparation method and application thereof, and halogenated branched butyl rubber, a preparation method and application thereof. The multi-component copolymer has a general formula shown in formula (I): R1, R2 and R3 are polymer chain segments, and the terminal contains a structural unit from a conjugated diene; R1 contains a styrene structural unit and a butadiene structural unit; R2 contains the chain segment shown in the formula; R3 contains the chain segment shown in the formula; wherein, is a styrene chain segment, and X is halogen. The multi-component copolymer is used as a grafting agent to prepare halogenated branched butyl rubber, the saturation degree of the halogenated branched butyl rubber can be improved, the extrusion swelling effect can be significantly reduced, the vulcanization speed, the ozone aging resistance and the air tightness can be improved, and the balance among the aging resistance, the product size stability and the vulcanization processing performance of the high-branched and high-saturation halogenated branched butyl rubber is achieved.