45results about How to "Improve toughening efficiency" patented technology

This invention relates to a PVC impact modifier with new-type nucleocapsid structure and its preparing method and application.It comprises: using acrylic monomer as main material, making cross-linked polymer latex with pure nucleus or nucleocapsid structure by semi-continuously charging mode of seed emulsion polymerization, then in the presence of said latex, adding chloroethene monomer to autoclave to emulsion polymerization, so as to obtain polyacrylate/PVC composite particle modifier with nucleocapsid structure.Because said modifier uses directly PVC as shell, it improves greatly compatibility between modifier and PVC resin matrix at crossblending, increasing two-phase bonding force, effectively giving play to characteristics of polyacrylate elastomer kernel so as to increase PVC material notch impact property, weathering-heating resistance and thermal stability, making general resin have high performance and functionization. It has low production cost, high added value of PVC resin, and widens PVC resin application.

This invention relates to a method for preparing polyvinyl chloride impact modifier with core/shell structure. The method comprises: utilizing acrylate monomer as the raw material, performing seed emulsion polymerization by semi-continuous adding the raw material to obtain crosslinked polymer latex with elastomer core/transition layer structure, adding vinyl chloride monomer and other monomers into the high-pressure kettle, and performing emulsion polymerization to obtain polyvinyl chloride impact modifier with core/shell structure. The impact modifier has polyvinyl chloride as the shell, thus can improve the compatibility with polyvinyl chloride resin matrix when blending, and effectively exert the functions of polyacrylate elastomer core and functional groups. The impact modifier can improve the impact property, weathering resistance and heat stability of polyvinyl chloride materials. Besides, the cost of the impact modifier is lower than that of polyacrylate impact modifier, thus can increase the added value of polyvinyl chloride resin and broaden the applications of polyvinyl chloride resin.

The invention relates to a halogen-free flame-retardant styrene-series resin compound and a preparation method thereof. The resin composition comprises the following components in parts by weight: 40-80 parts of styrene system resin, 20-60 parts of a char forming agent, 0-5 parts of a compound char forming agent, 5-25 parts of a halogen-free flame retardant, 0.5-10 parts of a toughening agent, 0.1-0.5 part of an anti-falling agent, 0.1-1 part of an antioxidant and 0.2-2 parts of a lubricating agent. The preparation method comprises the following steps of: premixing the raw materials through a high mixer; performing melt extruding through a dual-screw extruder; and cooling and granulating to obtain a product. The obtained product is accordant with the requirements of halogen freeness and environmental friendliness, has superior flame retardance and mechanical performance, and can be used for office equipment such as copiers, printers, fax machines and the like, and household electrical appliance products such as displays, cameras, air conditioners, refrigerators and the like with requirements of halogen freeness and environmental friendliness.

The invention discloses a method of preparing ethylene propylene diene monomer (EPDM) graft polymer through solution grafting copolymerization and an application thereof in the preparation of engineering plastics. The method optimizes and improves the preparation method on the basis of the solution grafting copolymerization preparation of EPDM-g-SAN, introduces polar monomer MMA, synthesizes EPDM-g-MAN or EPDM-g-MAS which has less content of AN unit of the graft chain, on the condition of low AN dosage; in addition, the highest monomer conversion rate of the method can reach 70-95% by adjusting the monomer proportioning so as to increase the grafting rate and grafting efficiency of the grafting copolymerization system and significantly improve the compatibility between EPDM graft polymer and SAN resin and the toughening efficiency of EPDM graft polymer to SAN resin. By mixing the EPDM graft polymer prepared in the invention and SAN resin, impact resistance engineering plastics with excellent weather resistance, aging resistance and yellowing resistance and high glossiness can be prepared.

The invention discloses core-shell particle toughened PBT/PC alloy which is composed of 50% of PBT, 30% of PC and 20% of PBg-MSG core-shell particles. The PB-g-MSG core-shell particles are adopted as a modifier, core-shell particles PB-g-MSG taking polybutadiene as a core and methyl methacrylate-styrene-glycidyl methacrylate copolymer as a shell are used to toughen PBT/PC, and vitrification temperature and grafting degree of polybutadiene in the core-shell particles are regulated by changing molecular weight to adjust using amount of TDDM, so that effective toughening of PBT/PC is realized by PB-g-MSG. As content of TDDM is increased, glass-transition temperature of polybutadiene is lowered, and toughening ability of the core-shell particles is improved. At the same time, content of rigid and free methyl methacrylate-styrene-glycidyl methacrylate copolymer (f-MSG) in the system is increased, and PBT and the f-MSG copolymer react, so that strength of a mixture is improved. Notch impact strength of the mixture reaches 904J/m, tensile strength is 49.4MPa, and high strength and high tenacity are realized.

The invention discloses a micro-foaming PA/ASA (polyamide/acrylonitrile styrene acrylate) material and a preparation method thereof. The micro-foaming PA/ASA material is prepared from PA resin, ASA resin, a toughening agent, a lubricating agent, a compatilizer, an antioxidant and a foaming agent in parts by weight by virtue of two-step method fusion and extrusion as well as injection molding. The toughness of the material is improved, and the material has excellent mechanical properties of both PA and ASA, and is stable in size, good in fluidity and excellent in weathering resistance; and meanwhile, the problems of poor fluidity and shrinkage marks during injection molding of a PA/ASA product are solved, so that the micro-foaming PA/ASA material can be widely applied to the fields of automobiles, electronic appliances, electric tools and the like.

The invention relates to the technical field of nylon, in particular to an odorless antistatic PVC composite material and a preparation method thereof, and the odorless antistatic PVC composite material comprises the following raw materials by weight: PVC, an odorless plasticizer, a modifier, a heat stabilizer, a lubricant, an antistatic agent, a flame retardant, a mildew inhibitor and an antioxidant. A core-shell particle modifier with nano silicon dioxide as a core, polymethyl methacrylate as a middle layer and polystyrene as an outer layer shell is prepared by an emulsion polymerization method; the dispersion problem of the nano silicon dioxide is effectively solved; meanwhile, by utilizing the characteristic that all layers of the core-shell particles are different in performance, whenthe core-shell particles are impacted, all the layers are prone to deformation to different degrees to form cavities, and compared with MBS of a core-shell structure, the toughening efficiency is higher, the inorganic rigid particles serve as cores, and the rigidity performance of PVC is well improved.

The invention discloses a method for preparing a plant oil-based core-shell structural flexibilizer. The method is characterized in that liquid plant oil serves as a core, and the core is adopted to properly crosslink so as to obtain a relatively stable plant oil core structure; and then, a layer of hard polymer shell with high fluidity and solubility parameters similar to polyvinyl chloride (PVC) is polymerized on the external surface of the plant oil core structure through grafting free radical polymerization. The plant oil-based core-shell structural flexibilizer which is suitable for PVC is obtained through designing different core-shell structures. Compared with a conventional flexibilizer (such as acrylate copolymer ACR and chlorinated ppolyethylene CPE), the plant oil-based core-shell structural flexibilizer has the advantages of low price, high toughening efficiency, green, environment friendliness and the like; and the plant oil-based core-shell structural flexibilizer can be widely applied to the fields such as PVC building door and window sections, pipes, pipe fitting, electric wires and cables, conduits, small household appliances and the like.

The invention discloses a high-flowability and high-toughness PC/PET (polycarbonate/polyethylene terephthalate) composite. The high-flowability and high-toughness PC/PET composite is prepared from PCresin, PET resin, a toughening agent, a flame retardant, an antioxidant and other aids, wherein the toughening agent is a styrene-butadiene-glycidyl methacrylate terpolymer and contains 30wt.%-40wt.%of styrene, 55wt.%-65wt.% of butadiene and 0.1wt.%-1.0wt.% of glycidyl methacrylate and has the mass average molecular weight being 18,000-25,000. On the premise that no compatibilizer or chain extender is used in the composite, the toughening agent with the special structure is selected, has very high toughening efficiency and has very small influence on the flowability of the composite, the thermal stability of the composite is improved, and the mechanical property of the composite is guaranteed. The flowability, toughness and thermal stability of the composite are greatly optimized, and thecomposite is particularly applicable to occasions with higher requirements for the flowability and the use environments.

The invention discloses a thin-wall lightweight meter cable for oil-gas engineering. The thin-wall lightweight meter cable comprises a cable core and a sheath layer coating the outer side of the cablecore, wherein the sheath layer is prepared from the raw materials in parts by weight: 60-80 parts of ethylene propylene terpolymer rubber, 40-50 parts of polyurethane rubber, 50-60 parts of nitrile silicone rubber, 6-10 parts of vulcanizer, 40-50 parts of vermiculite powder, 20-30 parts of precipitated barium sulfate, 60-70 parts of channel carbon black, 4-8 parts of octyl phenolic aldehyde tackifying resin, 40-50 parts of carbon fibers, 4-8 parts of propylene glycol polysebacate, 2-4 parts of modified soybean oil and 3-5 parts of anti-aging agent.

The invention discloses a high-impact wear-resistant transparent polystyrene composition as well as a preparation method and application thereof, and belongs to the technical field of engineering plastics. The transparent polystyrene composition is prepared from the following components in parts by weight: 58.5 to 78.5 parts of GPPS, 15 to 30 parts of a styrene-butadiene block copolymer, 5 to 10 parts of a styrene-methyl methacrylate copolymer and 0.5 to 1 part of a styrene-maleic anhydride copolymer, the melt flow rate of GPPS under the test conditions of 200 DEG C and 5kg is greater than or equal to 6g/10min. The impact resistance and wear resistance of the GPPS are improved while the transparency of the GPPS is maintained, and the transparent material with high impact resistance and wear resistance is obtained.

The invention relates to a coating method of a composite toughened slender rod, and belongs to the technical field of composite surface modification. The coating method comprises the following steps that firstly, fiber bundles soaked in resin penetrate through a small hole primary forming mold, and the circular section shape is formed; secondly, the fiber bundles penetrate through a coating chamber with carbon fiber powder coating stored inside; thirdly, the slender rod passes through a dust collection device which does not make direct contact with the slender rod, and carbon fiber powder which bonded to the surface infirmly are removed; fourthly, the slender rod passes through a preheating device and a heating device for preheating and gelling; fifthly, the slender rod passes through a shaping mold for shaping; sixthly, the slender rod is solidified through the heating device; and finally, the slender rod passes through a dust collector with fine bristle brushes, and fiber powder bonded to the surface of the slender rod infirmly is removed. The coating method can be achieved in the production process of the slender rod, the fiber powder is used as the coating, the bonding performance of coated composites is used, chemical residues are avoided, a separated coating procedure is omitted, the method is simple, and the efficiency is high.

The present invention adopts acrylic ester monomer as main raw material, utilizes the processes of seed emulsion polymerization by adopting semi-continuous changing mode, agglomeration or organic agglomerating agent and addition of nano-grade inorganic particles to obtain composite particle latex; in the pressure of the above-mentioned latex it is grafted with polyethylene to obtain the invented composite polyvinyl chloride emulsion resin with high notch impact strength, weatherability and good low-temp. impact property at normal temp. It can be extensively used in the fields of indoor decoration material, electric equipmkent and meter, tog and others.

The invention discloses a high-strength heat-resistant flame-retardant ABS alloy material. The material is prepared from, by weight, 100 parts of high-heat-resistant ABS particles, 11-53 parts of polyphenylene ether, 13-21 parts of PET, 5-10 parts of resorcinol diphenyl diphosphate, 0.5-2 parts of MAH-g-SEBS, 1.5-4.3 parts of SAN-g-GMA, 3-5 parts of dispersant, 5-15 parts of glass fiber, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer, 0.5-5 parts of processing aid and 2-11 parts of flame retardant. The high-strength heat-resistant flame-retardant ABS alloy material has extremely high heat resistance and impact resistance, a high flame-retardant effect and high stability, the glossiness of ABS alloy is guranateed, the excellent physical and mechanical properties of original ABS are maintained, and the alloy material can be widely used in the fields of household appliances, electronic telecommunication devices and automobile spare parts with a high requirement for the heat resistance of materials.

The invention discloses a chip-level underfill adhesive and a preparation method thereof, and the chip-level underfill adhesive comprises the following components in parts by mass: 10-30 parts of epoxy resin; 5-25 parts of a curing agent; 45 to 75 parts of toughening filler; wherein the toughening filler is a composite particle which takes a spherical inorganic particle as a core and is grafted with a toughening agent after the surface of the spherical inorganic particle is modified by a silane coupling agent; preferably, the silane coupling agent is selected from one or more of compounds as shown in a formula (1). The spherical inorganic particles are used as a carrier to realize uniform dispersion of the filler and the flexibilizer in an epoxy resin matrix, the inorganic particles are used as a stress bearing framework to induce and transfer stress, the stress is dispersed through the surface grafted flexibilizer, the fracture toughness is remarkably improved while the strength is not lost, and the service life of the filler and the flexibilizer is prolonged. And meanwhile, the flexibilizer is inhibited from separating out split phases at the underfill. After a chip is filled with the filling adhesive provided by the invention, no crack is generated in 1000 times of cold and hot cycles at the temperature of-45 to 125 DEG C, and the filling adhesive has relatively high reliability.

The invention discloses a composite modified hard PVC sheet with high calcium carbonate content and a preparation method thereof. The composite modified hard PVC sheet comprises the following components in parts by weight: 80-100 parts of PVC resin, 30-80 parts of calcium carbonate, 3.5-10 parts of a composite modifier, 1-3 parts of a heat stabilizer, 1-2 parts of a plasticizer and 0.1-0.6 part of fatty acid ester; wherein the composite modifier is composed of an acrylate core-shell polymer and a binuclear coupling agent according to a certain weight ratio. Through compounding of AIM and FT-16, toughening is achieved with less AIM, and meanwhile, the addition amount of calcium carbonate in the hard PVC sheet is increased through FT-16, so that the hard PVC sheet is easy to form. According to the invention, the hard PVC sheet provided by the invention has good toughness, weather resistance, processability and mechanical properties, solves the problems of great processing difficulty and influence on the mechanical properties of the material when the existing hard PVC sheet is modified and the addition amount of calcium is higher than 30%, and has good practical and economic values.

The invention belongs to the technical field of polylactic acid materials and preparation thereof, and particularly relates to a super-tough heat-resistant polylactic acid/rubber alloy with a network-like structure and a preparation method thereof. The invention provides the preparation method of the super-tough heat-resistant polylactic acid/rubber alloy. The preparation method comprises the steps: preparing the polylactic acid/rubber alloy from poly-L-lactic acid, poly-D-lactic acid and rubber particles through a melt blending method, wherein at least one of the poly-L-lactic acid and the poly-D-lactic acid is multi-arm star-shaped polylactic acid, and the rubber particles are rubber particles with core-shell structures. According to the invention, when one of the selected poly-L-lactic acid and poly-D-lactic acid is selected from multi-arm star-shaped polylactic acid, the multi-arm star-shaped polylactic acid and the rubber particles are subjected to melt blending, so that the notch impact strength of the polylactic acid can be greatly improved; the super-tough heat-resistant polylactic acid/rubber alloy can be prepared; and in addition, the method is simple in process and easy to industrialize.

The invention discloses an instrument signal cable for controlling a computer. The instrument signal cable comprises a cable core and a jacket layer covering the outer side of the cable core; the jacket layer is prepared from the following raw materials in parts by weight: 100 to 110 parts of main materials, 1.5 to 2.5 parts of tert-butyl hydroperoxide, 2 to 4 parts of lauric acid, 1 to 2 parts oftetramethyl thiuram disulfide, 20 to 30 parts of heavy calcium carbonate, 15 to 25 parts of talcum powder, 45 to 55 parts of expanded perlite, 2 to 4 parts of melamine resin, 35 to 45 parts of cottonand linen fiber, 3 to 7 parts of plasticizer, 2 to 4 parts of antioxidant 1010, 1 to 2 parts of ultraviolet absorbent UVP-327, and 0.5 to 1.5 parts of light stabilizer GW-540. The instrument signal cable for controlling the computer is good in bend resistance and pulling resistance, high in tear strength, capable of preventing the direct contact between oxygen or vapour and a carbon chain, capable of effectively improving the hot oxygen stability and the aging resistance, and long in service life.