92results about How to "Low halogen content" patented technology

The invention discloses an underwater coating anti-pollution and anti-corrosion epoxy coating and a preparation method thereof. The underwater anti-pollution and anti-corrosion epoxy coating provided by the invention can solve the difficult problem that an amine type curing agent which is matched with the epoxy coating used at normal temperature for underwater coating reacts with water and carbon dioxide in the water or air to generate carbonates, so that a bonded layer is isolated by the carbonates, the adhesion is greatly reduced, the bonding force is reduced by above 50% in comparison with a dry environment, a coat is easy to shed, and the anti-corrosion capability is poor. The anti-pollution and anti-corrosion coating disclosed by the invention has the advantages of good underwater coating anti-corrosion performance, strong adhesion, great impact resistance and good flexibility, and can effectively prevent the problems that a paint film is damaged, and the damages and corrosion of a steel plate and concrete are accelerated due to the parasitic attachment of marine organisms.

A flame retardant epoxy resin composition comprises a phosphorus atom-containing flame retardant polyester resin in addition to essential components of an epoxy resin and a curing agent. The phosphorus atom-containing flame retardant polyester resin is obtained by a condensation reaction or a polycondensation reaction of a reactive phosphorus-containing compound represented by the structural formula (I). By use of the phosphorus atom-containing flame retardant polyester resin as a halogen-free flame retardant, it is possible to achieve flame retardancy, reduce an amount of poisonous gas emitted when ignited, and improve moldability. In addition, a cured product of this epoxy resin composition is excellent in heat resistance, water resistance, chemical resistance, solder resistance, moisture resistance and tracking resistance as well as the flame retardancy.

The invention relates to a method for separating holocellulose in wood fibers by using a choline deep-eutectic solvent. The method comprises the following steps: pretreatment of raw materials, benzene-alcohol extraction, preparation of the deep-eutectic solvent, treatment of the deep-eutectic solvent, separation of the holocellulose and recovery of the solvent. The method is characterized in thatchloride ions in the choline deep-eutectic solvent are replaced under a mild condition, a non-toxic hydrogen bond donor is matched, and the deep-eutectic solvent with low halogen content is prepared and is used for separating holocellulose in the wood fibers. The method is high in holocellulose extraction rate, high in purity, simple to operate, obvious in effect, high in practicability, small inpollution and easy to popularize.

A process for production a high purity epoxy compound with total chlorine content of 500 ppm or less is characterized in that alkali metal hydroxide is added to a bifunctional epoxy compound represented by the general formula (I), in which content of the component with n=0 is not less than 70% and less than 100%, and that reaction is caused to take place at a temperature of 95-150° C. to produce a multi-functional epoxy compound represented by the general formula (II).

The invention belongs to the technical field of adhesives, and particularly relates to an underfill adhesive, as well as a preparation method and application thereof. The underfill adhesive comprises 100 parts of an epoxy resin mixture, 20 to 100 parts of epoxy modified acrylate resin, 5 to 50 parts of a latent curing agent, 5 to 30 parts of an epoxy active diluting agent, 5 to 60 parts of acrylic ester, 0.1 to 5 parts of a thermal initiator and 0.1 to 10 parts of an additive. According to the underfill adhesive, as well as the preparation method and application thereof, epoxy modified acrylate resin is used as a bridging agent to bind an epoxy resin curing system and an acrylic ester curing system, so that high performance of epoxy resin can be achieved, and the viscosity can be greatly reduced by acrylic ester without changes in performance.

The invention provides a coloring photo-curing resin composition and condensate thereof, dry film and printing circuit board, which can form a solder resist layer with excellent concealment of color change caused by oxidation of copper circuit. The photo-curing resin composition can develop through alkali water solution and contains carboxylic acid resin (A), photopolymerization initiator (B), compound (C) with more than two olefinic unsaturated radicals and red colorant (D).

The invention relates to a cyclic quaternary ammonium salt electrolyte, a preparation method and an application therefor. The preparation method comprises the steps of enabling an inorganic aqueous alkali, organic secondary amine and alkyl dihalide to react to obtain halogenated cyclic quaternary ammonium salt reacting liquid; dehydrating the halogenated cyclic quaternary ammonium salt reacting liquid to obtain a solid powder mixture; dissolving the solid powder mixture into anhydrous organic solvent, and filtering to obtain an organic solution of the halogenated cyclic quaternary ammonium salt; adding ammonium salt of high purity acid into the organic solution of the halogenated cyclic quaternary ammonium salt, performing a backflow reaction, and then performing filtering, recrystallization, filtering, and vacuum drying to obtain the cyclic quaternary ammonium salt electrolyte. The preparation method is low in cost of the raw materials, and high in cyclization selectivity; the purifying method is simple and easy to implement, high in efficiency and low in cost; in addition, the preparation method has low requirement on equipment, and the industrial production of the cyclic quaternary ammonium salt electrolyte can be achieved easily; and in addition, the prepared cyclic quaternary ammonium salt electrolyte is low in content of halogen, the purity can reach more than 99%, and the yield can reach more than 90%.

The invention relates-an environmentally-friendly underfill adhesive having a low dielectric constant, and a preparation method thereof, and belongs to a one-component epoxy resin adhesive. The underfill adhesive comprises, by weight, 30-38 parts of epoxy resin, 8-20 parts of a curing agent, 33-46 parts of a filler, 2-5 parts of a diluent, 6-9 parts of a toughener, 0.3-0.5 part of a silane coupling agent, 0.3-0.5 part of an antifoaming agent and 0.2-0.8 part of a pigment. The underfill adhesive prepared in the invention has the advantages of low halogen content, low dielectric constant, high arc resistance, high weather resistance and the like, so packaging components have a high environmental protection property, a high electrical insulation property and a high reliability.

The invention relates to a room-temperature-storage type acrylate underfill adhesive and a preparation method thereof. The underfill adhesive comprises, by weight, 50-70 parts of modified acrylate resin, 20-30 parts of acrylate monomer, 1.0-5.0 parts of initiator, 0.1-1.0 part of inhibitor, 0.1-5.0 parts of auxiliaries and 0-5.0 parts of pigment. The room-temperature-storage type acrylate underfill adhesive is low in system halogen content, safer and more environment friendly, low in guarant viscosity, good in wettability and high in reliability, fully meets requirements on production process and reliability of SMT (surface mount technology), has excellent stability at room temperature and can be stored and transported at room temperature without cold preservation, and transportation and use costs are greatly reduced.

A multi-stage process and system for formation of a polyarylene sulfide is described. A first polymerization stage of the formation process can include reaction of a sulfide monomer with a dihaloaromatic monomer to form a prepolymer. A second polymerization stage can include further polymerization of the prepolymer with a sulfur-containing monomer and a dihaloaromatic monomer to form a low halogen content polyarylene sulfide. The amount of sulfur utilized in the second polymerization stage is a low fraction of the total amount of sulfur utilized in the multi-stage process.

The invention relates to an anti-pre-crosslinking rapid-solidification low-smoke zero-halogen flame-retardant silane crosslinking nano-modified polyolefin composition. The composition is prepared from, by weight, 100 parts of zero-halogen flame-retardant silane grafted nano-modified polyolefin matrixes A and 4-6 parts of catalyst master batches B. By the adoption of a fractional step method, a preparation method includes the steps that the zero-halogen flame-retardant silane grafted nano-modified polyolefin matrixes A and the catalyst master batches B are prepared and then mixed evenly, wherein the zero-halogen flame-retardant silane grafted nano-modified polyolefin matrixes A are formed by mixing nano-modified polyolefin, zero-halogen flame-retardant master batches, a silane grafted system and anti-pre-crosslinking agents, and the catalyst master batches B are formed by mixing carrier resin polyolefin and a rapid catalyst system. By the application of the method, the anti-pre-crosslinking low-smoke zero-halogen flame-retardant silane crosslinking nano-modified polyolefin composition capable of achieving rapid crosslinking under natural conditions can be prepared, the performance of the composition meets using requirements, and particularly, the composition can also be used for producing heat-resistant flame-retardant pipes when serving as a low-smoke zero-halogen flame-retardant silane crosslinking polyolefin cable material.

The invention discloses a low-smoke-zero-halogen high-flame-retardance power cable which structurally comprises a guiding wire. A flame retardant insulation layer is arranged on the outer side of the guiding wire. A carbon fiber flame retardant layer is arranged on the outer side of the flame retardant insulation layer. A foam flame retardant layer is arranged on the outer side of the carbon fiber flame retardant layer. The carbon fiber flame retardant layer is connected with the flame retardant insulation layer through a cross-linking layer, and the carbon fiber flame retardant layer is connected with the foam flame retardant layer through a cross-linking layer. According to the low-smoke-zero-halogen high-flame-retardance power cable, power cable flame retardant capacity is improved, and meanwhile release of toxic smoke is lowered during burning.

An object of the present invention is to provide an environmentally safe golf ball having excellent resilience. The present invention provides a golf ball having constituting members, wherein at least a part of the constituting members is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, wherein the organic sulfur compound includes a disubstituted compound of thiophenol, disulfide and/or thiophenol metal salt with Br, F or CF₃ only at ortho positions.