In a structural polyurethane adhesive, a polyisocyanate component contains a first prepolymer component containing a first isocyanate group-terminated urethane prepolymer which is a reaction product of a first material polyisocyanate consisting of an aromatic polyisocyanate, and a first material polyol containing a macropolyol; and a second prepolymer component containing a second isocyanate group-terminated urethane prepolymer which is a reaction product of a second material polyisocyanate consisting of an araliphatic polyisocyanate and/or an aliphatic polyisocyanate, and a second material polyol containing a polyether polyol having a number average molecular weight of 160 or more and 4800 or less. A ratio of the second prepolymer component with respect to the total amount of the first prepolymer component and the second prepolymer component is 2% by mass or more and 35% by mass or less.

In a structural polyurethane adhesive, a polyisocyanate component contains a first prepolymer component containing a first isocyanate group-terminated urethane prepolymer which is a reaction product of a first material polyisocyanate consisting of an aromatic polyisocyanate, and a first material polyol containing a macropolyol; and a second prepolymer component containing a second isocyanate group-terminated urethane prepolymer which is a reaction product of a second material polyisocyanate consisting of an araliphatic polyisocyanate and/or an aliphatic polyisocyanate, and a second material polyol containing a polyether polyol having a number average molecular weight of 160 or more and 4800 or less. A ratio of the second prepolymer component with respect to the total amount of the first prepolymer component and the second prepolymer component is 2% by mass or more and 35% by mass or less.

A structural flame retardant high strength low exothermic polymer grouting material for consolidating, belonging to a technical field of polyurethane material, is produced by combined the polyether polyol and the modified isocyanate in a weight ratio of 100:(100-160), leading to internal reaction temperature ≤100° C., strength ≥60 mPa, bonding ≥3 mPa, oxygen index ≥28% while no halogen and no effect on water quality, odor level (80° C.) ≤3.5, and fog test ≤5 mg (which means no physical additive flame retardant is diffused into the environment). In particular, with no halogen, which is known as environmental hormones, in the plasticizers, there will be less combustion smoke, wherein the present invention will not release corrosive or irritating hydrogen halide gas, nor produce toxic carcinogens polybrominated benzoxins and polybrominated dibenzofurans, thereby avoiding the long-term impact of the material on the environment.

This invention relates to a novel polyether polyol blend having an overall hydroxyl number of 56 mg KOH/g to 140 mg KOH/g, an overall functionality of greater than 2, and an overall content of copolymerized oxyethylene of 20% to 40% by weight. These novel polyether polyol blends may also be in-situ formed novel polyether polyol blends. A process for preparing these novel polyether polyol blends is also disclosed. These novel polyether polyol blends are suitable for preparing viscoelastic flexible polyurethane foams, and in a process for preparing viscoelastic foams.

An object of the present invention is to provide a novel rotaxane and a polyurethane using the same. The present invention provides a rotaxane having a crown ether and a chain molecule piercing through the cyclic structure of the crown ether, wherein a hydroxyl group exists at one terminal of the chain molecule, and a hydroxyl group bonds to the cyclic structure of the crown ether. The present invention further provides a polyurethane using the rotaxane as a polyol component.

The present disclosure provides coating compositions and cured products formed from the coating compositions. The cured products can be formed at high cure speeds from the coating compositions and feature low Young's modulus, high tear strength, and/or high tensile toughness. The cured products can be used as primary coatings for optical fibers. The primary coatings provide good microbending performance and are resistant to defect formation during fiber coating processing and handling operations. The coating compositions include an oligomer, an alkoxylated monofunctional acrylate monomer, and preferably, an N-vinyl amide compound.

The present disclosure provides coating compositions and cured products formed from the coating compositions. The cured products can be formed at high cure speeds from the coating compositions and feature low Young's modulus, high tear strength, and/or high tensile toughness. The cured products can be used as primary coatings for optical fibers. The primary coatings provide good microbending performance and are resistant to defect formation during fiber coating processing and handling operations. The coating compositions include an oligomer, an alkoxylated monofunctional acrylate monomer, and preferably, an N-vinyl amide compound.

The present disclosure provides coating compositions and cured products formed from the coating compositions. The cured products can be formed at high cure speeds from the coating compositions and feature low Young's modulus, high tear strength, and/or high tensile toughness. The cured products can be used as primary coatings for optical fibers. The primary coatings provide good microbending performance and are resistant to defect formation during fiber coating processing and handling operations. The coating compositions include an oligomer, an alkoxylated monofunctional acrylate monomer, and preferably, an N-vinyl amide compound.

This invention generally provides composition for making a polyurethane foam with reduced aldehyde emission and more specially to composition useful in means of transport such as interior part of cars, wherein composition is comprising: (a) a polyfunctional isocyanate; (b) an isocyanate reactive composition; and (c) a compound of the formula (I) or (II), wherein the compound (c) is present by weight percentage in the composition in an amount ranging from about 0.001 to about 10, preferably from about 0.01 to about 5, and more preferably from about 0.05 to about 2 based on the total weight of the composition. The compositions can reduce aldehyde emission, especially acetaldehyde emission in the PU foam and has no obvious influence on the mechanic properties of the foam.

A prepolymer of elastomer material for screw drilling tools and a preparation method thereof are provided. The prepolymer includes component A and component B, wherein the component A includes hydroxyl-terminated liquid rubber, polytetrahydrofuran diol, and polyether polyol; the component B includes at least one of an isocyanate, a cyanate, and a cyano compound; the mass ratio of the hydroxyl-terminated liquid rubber, polytetrahydrofuran diol, and polyether polyol is (0.2-1.0): (0.2-1.0): (0.2-1.0). Different molecular segments of different proportions are introduced through structural design, such that the molecular structure of the prepolymer has both rigid and flexible segments, thus to achieve an adjustable and controllable structure of the prepolymer; and the introduction of active groups makes the prepolymer to show good reactivity and processability. Therefore, a reactive elastomer material having excellent properties such as hardness, tear strength, and tensile strength can be obtained used as an elastomer material for screw drilling tools.