Abstract: A multiphase particle has a multiphase structure comprising a first phase and a second phase and has an average particle size of 0.1-100 mm. The multiphase particle has a high bulk strength and a good interface binding power with the hardened cement and is particularly suitable for the toughening application of the hardened cement.

Abstract: A geopolymer material, and a preparation method therefor and the use thereof are provided. The geopolymer material contains modified siallite. On the basis of the total amount of the modified siallite and in terms of oxide, the aluminum content in the modified siallite is 35 weight % or more, and the silicon content is 40 weight % or more. The initial setting time of the geopolymer material is at least one temperature in the range of 70-300° C. is 5-10 hours, and the final setting time is 7-12 hours. The geopolymer material has an appropriate initial setting time and final setting time when activated by an activator, and can achieve well cementation at a higher temperature even when a retarder is not used in cooperation.

Abstract: An oil-gas well, a well cementation method, and a cement composition are provided. The oil-gas well has a well body, a sleeve disposed in the well body, and a cement slurry cured product disposed between the well body and the sleeve. Due to the strength and toughness of the cement slurry cured product, at least part of the sleeve is a non-metal sleeve. By selecting specific cement, the cured product of cement has excellent mechanical strength and toughness, and is mated with the non-metal sleeve to achieve well cementation.

Abstract: A polymer having a dispersing function, a preparation method therefor and use thereof as a cement dispersant are provided. The polymer has a structural unit (a), a structural unit (b) and a structural unit (c). The structural unit (a) is provided by an unsaturated polyether, the structural unit (b) is provided by an unsaturated acid and/or a salt thereof and/or an anhydride thereof, and the structural unit (c) is provided by a silane and/or siloxane having a polymerizable group and no less than five carbon atoms. The molar ratio of the structural unit (a), the structural unit (b) and the structural unit (c) is 1:(1-20):(0.01-0.5); and the polymer has a weight average molecular weight of 20,000-90,000 g/mol.

Abstract: A polymer having a dispersing function, a preparation method therefor, and a use thereof as a cement dispersant are provided. The polymer has a structural unit a, a structural unit b, a structural unit c and a structural unit d. The structural unit a is provided by an unsaturated polyether and/or polyester, the structural unit b is provided by an unsaturated carboxylic acid or an anhydride or salt thereof, the structural unit c is provided by a silane and/or siloxane containing a polymerizable group, and the structural unit d is provided by an unsaturated sulfonic acid or a salt thereof. The molar ratio of the structural unit a to the structural unit d is 1:(5-15) and the polymer has a weight average molecular weight of 20,000 to 120,000. The polymer can be used as an oil well cement dispersant.

Abstract: A multiphase particle has a multiphase structure comprising a first phase and a second phase and has an average particle size of 0.1-100 mm. The multiphase particle has a high bulk strength and a good interface binding power with the hardened cement and is particularly suitable for the toughening application of the hardened cement.

Abstract: The present invention provides a hemostatic powder. The hemostatic powder is mainly present in the form of a columnar particle, wherein the ratio of axial length to diameter of the columnar particle is less than 5; the hemostatic powder includes a polymer represented by the following structural formula: wherein the R is at least one selected from the group consisting of —NH2, —OCH2CH2OH, —OCH2CH2CH2OH, —OH, —ONa, —OK and —OCa; m, n and p respectively represent number percentages of corresponding repeating units in polymer molecules, and satisfy the following equations: m+n+p=1, p/(m+n+p)=0.05˜0.

Abstract: The present invention provides a hemostatic powder. The hemostatic powder is mainly present in the form of a columnar particle, wherein the ratio of axial length to diameter of the columnar particle is less than 5; the hemostatic powder includes a polymer represented by the following structural formula: wherein the R is at least one selected from the group consisting of —NH2, —OCH2CH2OH, —OCH2CH2CH2OH, —OH, —ONa, —OK and —OCa; m, n and p respectively represent number percentages of corresponding repeating units in polymer molecules, and satisfy the following equations: m+n+p=1, p/(m+n+p)=0.05˜0.

Abstract: The present invention provides a medical adhesive tape comprising a non-woven fabric substrate of a metallocene polypropylene copolymer; and a medical pressure-sensitive adhesive coated on at least one side of said substrate. A medical article comprising a medicament and the medical adhesive tape of the invention is also provided.