46results about How to "Increase shear viscosity" patented technology

The invention discloses a novel oil-based fracturing fluid. The novel oil-based fracturing fluid is prepared from raw material components in percentage by mass as follows: 4 %-7 % of nano-silica and the balance of an oil-soluble base solution. The oil-based fracturing fluid contains simple components, and various requirements of the oil-based fracturing fluid are met; a preparation method is simple, convenient and easy to implement, and gel breaking is simple, so that the purposes of simplifying the construction process and reducing the cost are achieved.

The present invention provides a poly(meth)acrylate viscosity index improver which has a polymer chain containing a structural unit represented by formula (1) and a structural unit represented by formula (2), and of which the Mw is at least 100,000 and Mw / Mn is at most 1.6. [R1 indicates hydrogen or a methyl group, R2 indicates a group represented by formula (3), and R3 indicates an alkyl group having 1-18 carbon atoms and a straight chain or a branch having at most 5 carbon atoms. m and n are integers that satisfy m>=5 and n>=4 and m+n<=31.

The present invention provides a poly(meth)acrylate viscosity index improver that has a polymer chain containing a structural unit represented by general formula (1), and that has a weight average molecular weight (Mw) of at least 100,000 and a ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of at most 1.6. [In formula (1), R1 represents hydrogen or a methyl group, and R2 represents a C1-36 alkyl group.]

The present invention refers to a method of producing a coated paper or paperboard, but excluding photographic papers, comprising the steps of:(a) forming a free flowing curtain comprising at least one layer, whereby the composition forming at least one layer of the free flowing curtain has a high shear viscosity of at least about 50 mPa·s, and(b) contacting the curtain with a continuous web substrate of basepaper and paperboard.

There is disclosed a lubricant composition comprising a base oil, wherein the ratio of isoparaffins to normal paraffins in the base oil ranges from about 30 to about 400.

Soy protein and carbohydrate containing binder compositions are described. The binder compositions may include a carbohydrate, a nitrogen-containing compound, and a soy protein. The binder compositions may also optionally include thickening agents such as modified celluloses and polysaccharides.

The invention discloses a novel insulating composite material and a preparation method thereof and relates to the technical field of insulating materials. The novel insulating composite material is prepared from raw materials in parts by weight as follows: 30-40 parts of polyamide resin, 10-20 parts of epoxy cellulose acetate, 8-15 parts of calcium carbonate, 5-15 parts of silicon nitride, 8-15 parts of modified nano hydroxymethyl cellulose crystals, 3-8 parts of magnesium stearate, 8-13 parts of kaolin, 5-11 parts of silicon dioxide, 5-12 parts of mica particles, 6-14 parts of glass fibers, 2-6 parts of a silane coupling agent, 3-8 parts of a filling agent, 1.5-3.5 parts of an ultraviolet absorbent, 2.2-5.3 parts of an antioxidant, 0.8-4.6 parts of an anti-freezing agent and 1-5 parts ofa flame retardant.

The invention discloses an associative thickening vac-veova emulsion and a preparation method thereof, and belongs to the technical field of research and development of architectural coatings; the vac-veova emulsion comprises the following components by the mass percentages: 40-50% of water, 1-3% of an emulsifier, 30-40% of vinyl acetate, 5-15% of butyl acrylate, 5-15% of tertiary carbonic ester VV-10, 0-1% of acrylic acid, 1-20% of an associative thickening monomer, and 0.5-2% of persulfate. The method includes the steps: pre-emulsifying a portion of water, a portion of the emulsifier and other components except persulfate; dissolving a portion of persulfate in water; taking and adding the balance of water and the balance of the emulsifier into a reaction kettle, and then putting the emulsified liquid as a seed for reaction; then adding a part of the remaining sulfate, at the same time, dropping the rest of the persulfate and the emulsified liquid, controlling the temperature and carrying out heat preservation; and post-processing. The prepared vac-veova emulsion can form a dense associative network structure and effectively improves the medium and high shear viscosity of a coating.

The invention discloses long-chain branched polylactic acid with high melt strength and excellent processing fluidity. The long-chain branched polylactic acid is characterized by being prepared from the following raw materials in percentage by weight: 93.00-99.80% of polylactic acid; 0.10-2.00% of an organic peroxide; and 0.1-5.00% of a branching regulating agent. The invention also provides a preparation method of the long-chain branched polylactic acid with high melt strength and excellent processing fluidity. According to the invention, a compound containing one vinyl or allyl group and one epoxy bond or isocyanate group is used as a branching regulating agent, and a long-chain branched structure is uniformly introduced into a polylactic acid molecular chain by adopting a reactive extrusion technology so that the long-chain branched polylactic acid has excellent melt strength and processing fluidity at the same time.

The invention discloses an associated thickening agent generated by a rheologic and modified monomer and a preparation method of the associated thickening agent. The associated thickening agent generated by the rheologic and modified monomer is characterized by being a polymer emulsion with solid content of 28-32%, wherein the polymer emulsion is formed by carrying out emulsion polymerization reaction on methacrylic acid (MAA) accounting for 38-42% of the total mass of a monomer, ethyl acrylate (EA) accounting for 46-50% of the total mass of the monomer and a docosyl-polyoxyethylene methacrylate and tristyrylphenol ethoxylate methacrylate mixture HPM-400 accounting for 10-13% of the total mass of the monomer; the adding amount of an emulsifier accounts for 6-9% of the weight of the monomer. The thickening agent prepared by the invention can be used for remarkably increasing the viscosity of water and can also be used for increasing the viscosity of a waterborne paint and improving the splashing resistance of the waterborne paint when used for the waterborne paint.

The present invention provides a poly(meth)acrylate-based viscosity index improver having a core, and three or more arms comprising a polymer chain containing a structural unit represented by formula (1) and a structural unit represented by formula (2), one end of said polymer chain being bonded to the core. The weight-average molecular weight (Mw) of the poly(meth)acrylate-based viscosity index improver is at least 100,000, and the weight-average molecular weight / the number average molecular weight (Mn) is not more than 1.6. [R1 represents hydrogen or a methyl group; R2 represents the group represented by formula (3); and R3 represents an alkyl group with 1 to 18 carbons. m and n are integers that satisfy m >= 5, n >= 4, and m + n <= 31.]

The present invention relates to a composition comprising an aqueous dispersion of xanthan gum and opacifying pigment particles such as TiO2 encapsulated with a vinyl ester polymer or a vinyl ester-acrylate copolymer, as well as a method for its preparation. The composition is useful in coatings formulations, especially paint formulations.