30results about How to "Play the role of internal plasticization" patented technology

The invention relates to a low-melting point polyester and a preparation method of the low-melting point polyester. The low-melting point polyester comprises a terephthalic acid chain segment, a m-phthalic acid chain segment, an ethanediol chain segment, a diethylene glycol chain segment, a molecular weight modifier capping group and a branched chain containing codlemone chain segment; a molecular weight modifier corresponding to the molecular weight modifier capping group is specifically benzoic acid, p-toluylic acid or p-ethylbenzoic acid, or corresponding methyl ester or ethyl ester of benzoic acid, p-toluylic acid or p-ethylbenzoic acid, or saturated fatty acid or corresponding methyl ester or ethyl ester of the saturated fatty acid; the saturated fatty acid refers to a fatty acid with the carbon number of 9-30. The preparation method comprises the following steps: (1) enabling the terephthalic acid, the m-phthalic acid, the ethanediol, the diethylene glycol, the molecular weight modifier and the branched chain containing codlemone to have an esterification reaction; (2) then conducting condensation polymerization to prepare the low-melting point polyester. The molecular weight distribution of the prepared low-melting point polyester is relatively wide, the melting point is further reduced, and the melting speed is faster.

The invention relates to colored low-melting-point polyester (PET) fiber and a preparation method thereof. The colored low-melting-point polyester fiber is of a skin-core structure, a skin layer is of low-melting-point polyester, and a core layer is of colored PET; the low-melting-point polyester is formed by a terephthalic acid chain segment, an isophthalic acid chain segment, a glycol chain segment, a diglycol chain segment, molecular weight modifier capping group and a branched-chain contained twelve carbon-dialcohol segments; a molecular weight modifier corresponding to the molecular weight modifier capping group specifically refers to benzoic acid, p-toluylic acid or ethylbenzoic acid, or methyl ester or ethyl ester corresponding to benzoic acid, p-toluylic acid or ethylbenzoic acid, or saturated fatty acid or methyl ester or ethyl ester corresponding to saturated fatty acid; the saturated fatty acid refers to the fatty acid 9-30 in carbon number; the preparation method includes the steps of low-melting-point polyester polymerization and skin-core composite spinning, drawing process is adopted in back spinning, and the low-melting-point polyester fiber is obtained via crimping, cutting and drying. The low-melting-point polyester fiber prepared is low in melting point and good in fresh image.

The invention relates to an ultra-short polyester fiber with a low melting point and a method for preparing the ultra-short polyester fiber. The ultra-short polyester fiber with the low melting point is of a skin-core structure. Skin layers are made of polyester with a low melting point, and core layers are made of PET (polyethylene terephthalate); the polyester with the low melting point comprises terephthalic acid chain segments, isophthalic acid chain segments, ethylene glycol chain segments, diethylene glycol chain segments, molecular weight regulator chain segments and dodeca-carbon diol chain segments with branch chains; molecular weight regulators corresponding to the molecular weight regulator chain segments are particularly monoacid series or binary acid series. The method includes steps of polymerizing the polyester with the low melting point and carrying out skin-core composite spinning; carrying out back-spinning by the aid of drafting processes; carrying out oiling, cutting-off and drying to obtain the ultra-short polyester fiber with the low melting point. The ultra-short polyester fiber with the low melting point and the method have the advantages that the initial melting point of the ultra-short polyester fiber prepared by the aid of the method is reduced to a certain extent, the melting speed of the ultra-short polyester fiber is increased, the ultra-short polyester fiber can be immediately molten at the corresponding temperatures, and good melting effects can be realized.

The invention relates to a long-chain alkyl ester modified novolac epoxy curing agent and a preparation method thereof. The modified novolac epoxy curing agent is a substitution reaction of novolak resin and saturated fatty acid chloride under the action of an acid-binding agent; the novolac resin is the common novolac resin and tert-butylphenol-formaldehyde resin (molecular weight: 500-1000). One; the saturated fatty acid chloride is one of dodecanoyl chloride to octadecanoyl chloride; the solvent is methylene chloride; the acid-binding agent is one of triethylamine and pyridine. The preparation method of the modified novolac epoxy curing agent is substitution reaction. The present invention has the advantages that: the long-chain alkyl ester structure of the curing agent can reduce the softening point of the novolak resin, and the apparent viscosity decreases, because the introduction of the long chain will increase the free volume of the system, and the chain segment activity space At the same time, the long-chain alkyl ester structure can play the role of internal plasticization and improve the processing fluidity of epoxy resin.

The invention discloses a preparation method of cashew nut oil modified phenolic resin. This method first prepares resin A; then mixes 100 parts of resin A, 80-280 parts of formaldehyde solution, and 0.1-5 parts of basic catalyst b evenly, reacts at 70°C-100°C for 1-5 hours, and then transfers to vacuum distillation kettle, at a temperature of 40-80°C and a vacuum of -0.03MPa--0.1MPa to remove moisture by distillation under reduced pressure until the moisture content of the resin is 0.5%-20%, drop to room temperature, add solvent and stir evenly, and adjust the solid content of the resin at 30%~70%, the viscosity is 40cp@25℃~400cp@25℃ to get cashew nut oil modified phenolic resin. The cashew nut oil modified phenolic resin of the present invention is prepared through two-step reactions, which not only has the characteristics of good heat resistance and flame retardancy of the phenolic resin, but also improves the toughness of the phenolic resin. The cashew nut oil modified phenolic resin can be used as a base resin for preparing copper clad laminates.

The invention relates to a filament low-melting-point polyester fiber and a preparation method thereof. The filament low-melting-point polyester fiber is in a skin-core structure, a skin layer is made of low-melting-point polyester; a core layer is made of PET (polyethylene terephthalate); the low-melting-point polyester consists of a terephthalic acid chain segment, an isophthalic acid chain segment, an ethylene glycol chain segment, a diethylene glycol chain segment, a molecular weight modifier chain segment and a 1, 12-Dodecanediol chain segment containing branched chains; a molecular weight modifier corresponding to the molecular weight modifier chain segment is specifically a monoacid series or a diacid series; the preparation method of the filament low-melting-point polyester fiber comprises the following steps: polymerization of the low-melting-point polyester and skin-core composite spinning, so as to obtain the filament low-melting-point polyester fiber. The prepared filament low-melting-point polyester fiber has the advantages that the initial melting point is reduced, the melting speed is increased, the polyester fiber is immediately melted at the corresponding temperature, and the melting effect is good.

The invention provides electromagnetic shielding paint for a heat shrink tubing. The electromagnetic shielding paint is prepared from raw materials in parts by weight as follows: 100 parts of modified thermoplastic elastomer SBS, 45-120 parts of electric conduction powder, 1-3 parts of an anti-settling agent, 0.1-0.3 parts of an antifoaming agent, 0.4-0.8 parts of a coupling agent and 100-300 parts of a mixed solvent, wherein the modified thermoplastic elastomer SBS is one substance with an S / B value of 30 / 70 or an S / B value of 40 / 60 or a mixture of two substances with the S / B value of 30 / 70and the S / B value of 40 / 60; the electric conduction powder is one or more of silver powder, nickel powder, silver-plated copper powder, silver-plated aluminum powder, silver-plated glass beads, silver-plated nickel powder and nickel-plated graphite; the anti-settling agent is at least one of polyethylene wax or polyamide wax; the antifoaming agent is an organosilicon antifoaming agent; the coupling agent is at least one of a titanate coupling agent or a silane coupling agent; and the mixed solvent is prepared by mixing 120# solvent gasoline and methylbenzene at the mass ratio of (8:1)-(2:1).