Sequential, double elastomer vulcanization method, system, and composition. First and second immiscible elastomers are mixed together with a first additive package. A first curative system is activated to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase. Then, a second curative system is activated to vulcanize the second elastomer in the continuous phase. Since the partially vulcanized mixture is melt processable, a second additive package can be introduced to the mixture after activating the first curative system. Or, the second curative system can be activatable at a temperature which is higher than an activation temperature of the first curative system. In this manner, blends of dissimilar elastomers can be vulcanized with independent control of plasticizer, filler and curative distribution.

Sequential, double elastomer vulcanization method, system, and composition. First and second immiscible elastomers are mixed together with a first additive package. A first curative system is activated to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase. Then, a second curative system is activated to vulcanize the second elastomer in the continuous phase. Since the partially vulcanized mixture is melt processable, a second additive package can be introduced to the mixture after activating the first curative system. Or, the second curative system can be activatable at a temperature which is higher than an activation temperature of the first curative system. In this manner, blends of dissimilar elastomers can be vulcanized with independent control of plasticizer, filler and curative distribution.

Reversibly cross-linkable foam is provided. The reversibly cross-linked foam includes a first polymeric material, at least one reversibly cross-linkable monomer polymerized with the first polymeric material, and at least one blowing agent. The reversibly cross-linkable co-polymeric foam is thermally stable at temperatures of at least 10 degrees higher than otherwise identical polymeric foam that does not include the reversibly cross-linkable agent polymerized with the first polymeric material.

The present invention relates to a hot-curing reactive composition based on natural and/or synthetic elastomers containing olefinic double bonds, and further containing at least one vulcanization system, as well as the use thereof as a one-component adhesive, sealant, as sealing compound or coating compound in vehicle construction, in particular in automotive body assembly. The present invention further relates to the use of corrosion protection pigments for improving the corrosion protection effect of such compositions.

The present invention relates to a hot-curing reactive composition based on natural and/or synthetic elastomers containing olefinic double bonds, and further containing at least one vulcanization system, as well as the use thereof as a one-component adhesive, sealant, as sealing compound or coating compound in vehicle construction, in particular in automotive body assembly. The present invention further relates to the use of corrosion protection pigments for improving the corrosion protection effect of such compositions.

The present invention provides a curing catalyst which promotes a reaction between a hydroxyalkyl amide-based curing agent and a carboxy group-containing resin, especially curing of a carboxy group-containing resin-based powder coating material using a hydroxyalkyl amide-based curing agent, and in particular, curing of a polyester resin-based powder coating material. A curing catalyst which promotes a reaction between a carboxy group-containing resin and a compound that has a β-hydroxyalkyl amide group, said curing catalyst containing a compound that contains, as a metal atom, at least one element selected from the group consisting of Mo, Cr, V, Fe, Co, Ni, Ga, Zr, In, Ba, Ce and Bi. It is preferable that the metal atom is an Mo atom. An Al atom may be included as the metal atom.

A method of making a proppant-gel matrix comprising: a) hydrating a gelling agent to form a hydrated gelling agent; b) adding a basic compound to the hydrated gelling agent to form a basic hydrated gelling agent having a pH in the range of 11.5 to 14.0; c) mixing the basic hydrated gelling agent and a proppant to form a basic hydrated gelling system; and d) adding a crosslinking agent to the basic hydrated gelling system to form the proppant-gel matrix, is disclosed. The proppant-gel matrix can then be used as a fracturing fluid in a hydraulic fracturing process.

A method of making a proppant-gel matrix comprising: a) hydrating a gelling agent to form a hydrated gelling agent; b) adding a basic compound to the hydrated gelling agent to form a basic hydrated gelling agent having a pH in the range of 11.5 to 14.0; c) mixing the basic hydrated gelling agent and a proppant to form a basic hydrated gelling system; and d) adding a crosslinking agent to the basic hydrated gelling system to form the proppant-gel matrix, is disclosed. The proppant-gel matrix can then be used as a fracturing fluid in a hydraulic fracturing process.

Disclosed is a method for preparing a nitric oxide-generating adherent coating, comprising: preparing a buffer solution containing polyphenol compounds, organic selenium or sulfur compounds and soluble copper salts; then contacting a base material with the solution, and washing and drying to obtain a target product. The nitric oxide-generating material prepared by the method can be used for any medical device, such as an intravascular stent, or materials and any complex-shaped base material, and has the capability of scavenging free radicals and catalyzing RSNO to produce nitrogen monoxide, and also has a response function of reduced glutathione (GSH), an antimicrobial function and all the physiological functions possessed by nitrogen monoxide.

The present invention discloses a rubber composition, a processing method for obtaining the rubber composition, and application of the composition in processing of flame-retardant products. The rubber composition includes a rubber matrix and essential components. The rubber matrix includes a branched polyethylene with a content represented as A, in which 0<A≤100, and an EPM and an EPDM with a total content represented as B, in which 0≤B<100. The essential components include 1.5 to 10 parts of a crosslinking agent and 40 to 300 parts of a flame-retardant agent. The rubber composition can be applied to production of flame-retardant products, such as flame-retardant cable, flame-retardant cool air hose for automobile, flame-retardant sealing strip, high-temperature-resistant flame-retardant conveyor belt, and flame-retardant waterproof coil. The products have good flame-retardant effects and mechanical properties.