GB4323-84 polyurethane elastic sleeve

GB4323-84 polyurethane elastic sleeve is mainly used for the accessories of elastic sleeve pin coupling. GB4323-84 polyurethane elastic sleeve has longer life, better elasticity, more oil resistance than the previous rubber elastic sleeve. It can also be used widely. Polyurethane elastic sleeves for cushioning and damping equipment for water pumps, motors, couplings, etc.

The material of GB4323-84 polyurethane elastic sleeve is polyurethane, and the polyurethane material is currentlyHigh-performance insulation materials.The main chain contains -NHCOO- repeating structural unit of a type of polymer.The English abbreviation PU.It is formed by polymerization of isocyanate (monomer) and hydroxyl compound.Due to the strong polar urethane group, it is insoluble in non-polar groups, and has good oil resistance, toughness, stability and adhesion.Different raw materials can be used to produce materials suitable for a wide temperature range (-50～150℃), including elastomers, thermoplastic resins and thermosetting resins.It is not resistant to hydrolysis at high temperature, nor is it resistant to alkaline media.

Commonly used monomers such as toluene diisocyanate, diisocyanate diphenylmethane and so on.Polyols are divided into three categories: simple polyols (ethylene glycol, glycerol, etc.); polyester oligomers with terminal hydroxyl groups, used to prepare polyester polyurethane; polyether oligomers with terminal hydroxyl groups, used Preparation of polyether polyurethane.The polymerization method varies with the nature of the material.When synthesizing elastomers, firstly prepare low molecular weight diols, and then react with excess aromatic isocyanates to form isocyanate-terminated prepolymers, which are then extended with butanediol to form thermoplastic elastomers; if aromatic diamines are used for expansion The chain is further cross-linked, casting type elastomer.The prepolymer is chain extended with hydrazine or diamine, and elastic fiber; the prepolymer with excessive isocyanate is mixed with the catalyst and blowing agent, and it can be directly rigid foam plastic.If monomer, polyether, water, catalyst, etc. are mixed, the flexible foam can be reacted in one step.The monomer reacts with the polyol in the solution and can be used for coating; the adhesive uses the polyisocyanate monomer and the low molecular weight polyester or polyether to mix and react during use.

Polyurethane elastomers are used as rollers, conveyor belts, hoses, auto parts, shoe soles, synthetic leather, wires and cables, and medical artificial organs, etc.; soft foams are used as pads for vehicles, rooms, and clothing, and rigid foams are used as Thermal insulation, sound absorption, packaging, insulation and low-foaming synthetic wood, coatings for vehicles, furniture, wood and metal protection, anti-leakage materials for pools, dams and buildings, and fabric coatings.Adhesives have good adhesion to metals, glass, ceramics, leather, fibers, etc.In addition, polyurethane can also be made into emulsions and magnetic materials.

GB4323-84 polyurethane elastic sleeve parameters:

Hebei GB4323-84 polyurethane elastic sleeve　Hebei GB4323-84 polyurethane elastic sleeve