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

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 relates to a method for preparing a modified phenolic resin for a paper-base copper clad laminate substrate resin. In the method, cardanol is adopted together with an epoxide vegetable oil to modify a phenolic resin, the usage amount of tung oil is reduced considerably, the copper clad laminate manufactured by using the modified phenolic resin as a main resin has the advantages of excellent flexibility, low water absorptivity, high electrical insulation in wet state, low manufacturing cost and the like, and at the same time, a melamine resin is added to further modify the phenolic resin, so the drawback that the phenolic resin changes color due to the light is inhibited obviously and the modified phenolic resin prepared by the method can meet requirements on appearance color.

The invention relates to a polyester fiber with a low melting point and a method for preparing the polyester fiber. The 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 and molecular weight regulator end-capping groups; corresponding molecular weight regulators of the molecular weight regulator end-capping groups particularly comprise benzoic acid, p-toluic acid or ethylbenzoic acid, or methyl ester or ethyl ester corresponding to the benzoic acid, the p-toluic acid or the ethylbenzoic acid, or saturated fatty acid or methyl ester or ethyl ester corresponding to the saturated fatty acid; the content of acetaldehyde in the polyester fiber with the low melting point is lower than 0.5 ppm. The method includes steps of polymerizing the polyester with the low melting point and carrying out composite spinning on skin and cores; carrying out back spinning by the aid of drafting-washing processes; carrying out oil-bath drafting by the aid of added sodium sulfite; carrying out crimping, cutting-off and drying to obtain the polyester fiber with the low melting point. The polyester fiber with the low melting point and the method have the advantages that the polyester fiber prepared by the aid of the method has the low melting point and is low in acetaldehyde content.

The invention discloses a production technology of a core-shell type room-temperature self-crosslinking acrylate emulsion. A room-temperature self-crosslinking monomer is introduced by adopting a seed pre-emulsification semi-continuous core-shell emulsion polymerization process; and the acrylate emulsion which has a hard-core and soft-shell structure, is self-crosslinked at room temperature and can be applied to a wood coating is synthesized. The emulsion with a core-shell structure has the advantages of good after-tack resistance, low film-forming temperature, relatively good film-forming property, stability and mechanical property; hard monomers SM and MMA have relatively high glass transition temperature; a film has relatively high hardness, glossiness, weather fastness, anti-fouling performance, cohesion and structure strength; soft monomers BA and 2EHA play an internal plasticization role in a polymerization system; and the film has certain flexibility and adhesiveness.

The invention relates to a three-dimensional crimp low-melting-point polyester fiber and a preparation method thereof. The three-dimensional crimp low-melting-point polyester fiber is in a skin-core structure, a skin layer is made of low-melting-point polyester, and a core layer is made of PET (polyethylene terephthalate). The low-melting-point polyester is formed by a terephthalic acid chain segment, an isophthalic acid chain segment, an ethylene glycol chain segment, a diethylene glycol chain segment, a molecular weight modifier and a branched dodecanediol chain segment. The molecular weight modifier is 1,8-naphthalic acid, phthalic acid, 1,2-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid or corresponding dimethyl esters or diethyl esters thereof. The preparation method includes steps of low-melting-point polyester polymerization, skin-core composite spinning, crimping, oiling, cutting and drying to obtain the three-dimensional crimp low-melting-point polyester fiber. Core layer spinneret holes of a spinneret plate in the composite spinning process are crescent. The three-dimensional crimp low-melting-point polyester fiber prepared according to the method is low in melting point.

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).

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 provides a UV-cured hot-melt acrylate pressure-sensitive adhesive and an electrical adhesive tape prepared from the same, and the UV-cured hot-melt acrylate pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 20-60 parts of acrylic resin, 20-40 parts of a tackifying resin, 2-15 parts of a reactive diluent, 2-15 parts of an alkene monomer, 2-10parts of a softener and 0.1-2.0 parts of an antioxidant. The prepared pressure-sensitive adhesive and the prepared electrical adhesive tape have excellent initial viscosity, peel strength and persistent viscosity, and meanwhile, the acrylic resin in the pressure-sensitive adhesive is obtained by pre-polymerizing a polymerizable macromolecular photoinitiator, so that the problems that the photoinitiator is residual, photolysis fragments are easy to migrate and volatilize, a cured product is easy to age and yellow, smell and toxicity are easy to occur and the like are solved.

The invention relates to a packaging material used in drugs and a preparing method thereof. The packaging material is prepared from, by weight, 72-85 parts of polyvinylidine chloride, 18-26 parts of acrylic ester, 20-28 parts of natural rubber, 10-17 parts of polyethylene glycol, 8-13 parts of lignocellulose, 10-16 parts of nano calcium carbonate, 7-13 parts of vermiculite power, 12-17 parts of corn starch, 3-8 parts of acetyl citrate, 5-9 parts of antibacterial agent and 2-6 parts of cellulose acetate; the packaging material used in the drugs use polyvinylidine chloride as a main raw material, has a good effect of obstructing gases in air such as oxygen, vapour, carbon dioxide, has a good damp resistant property, and good transparency and good heat-resistant and cold-resistant properties; the adding of acrylic ester and natural rubber plays a role of plasticizing the internal parts; acetyl citrate is adopted as a plasticizer, thus the packaging material used in the drugs is green and environmentally friendly, and poisonless and tasteless; through the adoption of the antibacterial agent, the packaging material used in the drugs has a strong antimicrobial effect and an enduring bacteria-resistant effect, and thus expiration date of the drugs is prolonged.

The invention provides an environment-friendly low-smoke halogen-free flame-retardant power cable with an anti-ultraviolet layer. The cable comprises a wire core assembly and a central filling rope from inside to outside, the wire core assembly is twisted around the central filling rope in a same direction, and the wire core assembly comprises a wire core body. The outer surface of the wire core body is coated with an inner shielding layer, the outer surface of the inner shielding layer is coated with an insulating layer, and the outer surface of the insulating layer is fixedly connected with an outer shielding layer. A fireproof filler is filled between the outer shielding layer and the insulating layer, the outer surface of the outer shielding layer is fixedly connected with an inner sheath layer, and the outer surface of the inner sheath layer is sequentially connected with an armored layer, a fireproof layer, an outer sheath layer and an anti-ultraviolet layer. According to the present invention, the ultraviolet-proof performance of the cable provided by the invention is relatively higher in glass transition temperature, and the brittle-tough transition is realized during ultraviolet radiation, so that the tensile strength of the cable is improved, partial aging side effects are counteracted, and further the cable has relatively higher ultraviolet-proof capability; the outer shielding layer is formed by weaving tin-plated steel wires and aramid fibers in a mixed manner, and the tin-plated steel wires are used for shielding interference, so that the excellent transmission efficiency of the cable is guaranteed.

The invention discloses a wear-resistant migration-resistant high elastic foot pad material which is prepared from the following raw materials in parts by weight: polyvinyl chloride, methyl hydrogen-containing silicone resin, allyl glycidyl ether, vinyl ester resin, toluene, c toluene, a chloroethylene-butyl acrylate copolymer, isobutyl rubber, a plasticizer, an anti-aging agent, a stabilizer, anaccelerant, a crosslinking agent, carbon black, serpentine powder, illite powder, sorbitol, chloroplatinic acid and ethanol. The wear-resistant migration-resistant high elastic foot pad material disclosed by the invention has the characteristics of being light to pave, novel in appearance and the like, has good wear resistance, slip resistance, waterproofness, proper toughness, stiffness and elasticity, is good in integral texture, is cold-resistant, anti-aging, fold-resistant, and good in gas permeability. The material is prepared by mixing rubber and plastic, so that the cost is lowered andthe material has a faux leather texture.

The invention relates to the technical field of functional material preparation, in particular to a water-based adhesive with low glass transition temperature as well as a preparation method and application thereof, and the water-based adhesive is prepared from the following raw materials in parts by weight: 310-335 parts of vinyl acetate; 120 to 165 parts of butyl acrylate; 4.0 to 5.5 parts of acrylic acid; 17 to 88 parts of polyvinyl alcohol, and 30 to 35 parts of polyvinyl alcohol; 25 to 27.5 parts of C12 to C14 secondary alcohol polyoxyethylene ether; 0.9 to 1.0 part of ammonium persulfate; 22 to 25 parts of triethyl citrate; 3.5 to 4.0 parts of sodium bicarbonate; and 675.9 to 801.4 parts of water. The defects that an existing water-based adhesive is high in glass-transition temperature and low in drying speed are overcome, the water-based adhesive high in drying speed is provided by reducing the glass-transition temperature of the water-based adhesive, and meanwhile the prepared water-based adhesive is small in particle size and has good viscosity, fluidity and stability.