38results about How to "Excellent halogen-free flame retardant performance" patented technology

The invention discloses carboxyl-terminated phosphorus-containing copolyester which is formed by randomly connecting and combining structural units shown as I, II and III according to carboxyl and hydroxyl functional groups, and the Mw of the carboxyl-terminated phosphorus-containing copolyester is 1.1*10<3>-1.3*10<4> g.mol<-1>. The invention further discloses a preparation method of the carboxyl-terminated phosphorus-containing copolyester, a halogen-free flame retardant biology-based pressure sensitive adhesive composed of the carboxyl-terminated phosphorus-containing copolyester and application. The copolyester is biology-based phosphorus-containing copolyester, the halogen-free flame retardant pressure sensitive adhesive formed by the copolyester and renewable resource epoxidized plant oil not only maintains the basic characteristics and good adhesive strength of a biology base, but also achieves the excellent halogen-free flame retardant properties, and the blank of biology-based halogen-free flame retardant pressure sensitive adhesive products is filled up; in addition, preparation is easy and mature, solvent is not used, the cost is low, pollution to the environment is little, and application and popularization are convenient.

The invention discloses a halogen-free flame-retardant type injection molding-class polyolefin wood plastic composite material and a preparation method thereof. The composite material consists of the following components in percentage by mass: 25 to 80 percent of polyolefin resin, 5 to 60 percent of plant fiber, 0.5 to 20 percent of compatilizer, 0 to 30 percent of flexibilizer, 0.5 to 8 percent of dispersant, 5 to 40 percent of flame retardant and flame retardance synergist and 0 to 1 percent of antioxidant. Compared with the conventional wood plastic composite material, the halogen-free flame-retardant type injection molding-class polyolefin wood plastic composite material has the characteristics of simple production flow, little using amount of the flame retardant, good halogen-free flame retardant effect, wide range of molding modes and the like and is applicable to various injection molding products, such as electric appliance shells, automobile parts, furniture, buildings and other parts.

The invention discloses a resin compound which comprises the following components in parts by solid weight: 100 parts of modified bismaleimide prepolymer, 5-30 parts of epoxy resin, 0-20 parts of curing agent, 0-150 parts of filler and 0.001-5 parts of curing accelerator, wherein the modified bismaleimide prepolymer is prepared by pre-polymerizing at least bismaleimide resin with allyl compounds.Compared with the prior art, the resin compound disclosed by the invention has the advantages of high peel strength, halogen-free fire resistance, high heat resistance, high temperature modulus retention rate, excellent toughness, coefficient of thermal expansion and high modulus retention rate. Especially, the resin compound can meet the requirement for halogen-free fire resistance UL94V-0 whilehas excellent high temperature modulus retention rate and low coefficient of thermal expansion, so that the resin compound can be applied to high-performance circuit materials, such as HDI high multilayer substrates.

The invention discloses a UV-curing halogen-free flame-retardant low-shrinkage epoxy resin composition and a preparation method thereof. The composition is prepared from, by mass, 50%-70% of phosphorus-containing flame-retardant epoxy resin prepolymer, 11% -30% of active diluents, 5%-20% of spirocyclic monomers and 2%-4% of positive ion photoinitiator. The preparation method of the phosphorus-containing flame-retardant epoxy resin prepolymer includes the steps of mixing epoxy resin E-51 with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxider, and raising the temperature to enable the mixture to be reacted to prepare the prepolymer. According to the composition and the preparation method thereof, the product is not only high in flame-retardant efficiency, but also small in effect on mechanical performance of epoxy resin; when the content of phosphorus is 1.3%, the cured product LOI reaches 34%, vertical combustion passes through UL 94V-0 level, curing can be performed rapidly under irradiation of UV, the volume shrinkage rate is quite low in the curing forming process, and even zero shrinkage can be reached.

The invention belongs to the technical field of electronic materials, and specifically relates to a preparation method of a coated flame retardant with excellent electrical properties. The preparation method of a kind of coated flame retardant with excellent electrical properties proposed is: select low Dk, low Df core material; the outer surface of the core material is coated with DOPO derivatives as flame retardant layer; the core material The mass ratio to the flame retardant layer is 1:1~1:100; the bulk density of the coated flame retardant is 50 g / L~1000 g / L; the moisture content of the coated flame retardant is 0.01 wt%~5 wt%; the invention not only effectively solves the problem of the interface between the filler and the matrix and the problem of uneven dispersion, but also solves the problem of large dosage and high cost of DOPO derivatives or other filled flame retardants.

Disclosed are a flame-retardant resin composition, and a prepreg and a laminate which are prepared therefrom. The flame-retardant resin composition, based on the solid weight, comprises: 100 parts of a modified bismaleimide prepolymer, 5-30 parts of an epoxy resin, 0-20 parts of a curing agent, 0-150 parts of a filler, and 0.001-5 parts of a curing accelerator, wherein the modified bismaleimide prepolymer is at least formed by prepolymerizing a bismaleimide resin and an amine compound.