246results about How to "Rapid development of strength" patented technology

The invention provides a high temperature resistant silicate cement paste and a preparation method thereof. The high temperature resistant silicate cement paste comprises the following components in parts by weight: 100 parts of oil well silicate cement, 60 to 85 parts of a high-temperature reinforcing material, 68 to 80 parts of fresh water, 1 to 200 parts of a density conditioning agent, 0.1 to1.5 parts of a suspension stabilizer, 0.8 to 1.5 parts of a dispersing agent, 3 to 4 parts of a fluid loss agent, 0 to 3 parts of a retarder and 0.2 to 0.8 part of defoamer. The high temperature resistant silicate cement paste has high sedimentation stability and is rapid in strength development at a low temperature, the compressive strength at the high temperature of 350 DEG C reaches up to morethan 40 MPa, the long-term high-temperature compressive strength development is stable and free of declination, so that the field application requirement of a heavy oil thermal recovery well can be met, and the level of silicate G-level cement used for oil gas well cementing operation is reached.

In one embodiment, the invention is an composition comprising: a) one or more isocyanate functional polyether polyurethane prepolymers; and b) one or more prepolymers of one or more polyisocyanates and one or more polyesters wherein the terminal groups on the polyester polyol polyurethane prepolymer are the residue of a monofunctional polyalkylene glycol (hereinafter capped polyester polyurethane prepolymer) or one or more polyester polyols which are capped with the residue of one or more monofunctional isocyanates (hereinafter isocyanate capped polyesters); wherein the composition is a low viscous paste at temperature of from about 40 to about 80° C. and is high viscous paste at a temperature of from about 40° C. or less. In a preferred embodiment the composition further comprises c) one or more catalysts for the reaction of isocyanate moieties with hydroxyl groups. In another embodiment the invention is a method of bonding two or more substrates together which comprise contacting the two or more substrates together with a composition according to this invention disposed along at least a portion of the area wherein the substrates are in contact wherein the composition is a low viscous paste. In a preferred embodiment the composition is heated to about 40° C. to about 80° C. and converted to a low viscous paste prior to contacting it with the one or more substrates.

The invention is an adhesive composition comprising: a) an isocyanate functional polyether base prepolymers having a z molecular weight average (Mz) of about 10,000 to about 80,000 g / mole; a carbon black having an average oil absorption number of at least about 80 to at most about 400 cubic centimeters of dibutyl phthalate per 100 grams of the carbon black; (c) reactive silicon in an amount from about 0.001% to about 10% by weight of the adhesive composition; and (d) one or more catalysts for the reaction of isocyanate with hydroxyl groups. The adhesive compositions of the invention surprisingly may have improved sag performance (i.e., decreased sag) when heated, while also making them more easily pumped.