36results about How to "Increased Vicat softening point" patented technology

The invention provides a markrolon / modified polyester blending rolling base material and a preparation method thereof. The markrolon / modified polyester blending rolling base material comprises the following components by weight percent: 55-65% of makrolon, 15-20% of modified polyester, 4-8% of modified copolyesters additive, 3-5% of compatilizer 4051, 4-7% of titanium white, 2-6% of calcium carbonate and 0.01-0.1% of pigment. The vicat softening point of the invention can be 115 DEG C+ / -2 (50-5kg of vicat A), the tensile strength is larger than 45Mpa, the tensile yield strength is larger than750KJ / m<2>; and the invention meets the rolling technology requirement by improving the formula lubrication systems, can meet the requirement of the processes such as material application, card making technology of smart card base materials and the like.

The invention discloses a polrvinyl chloride heat-resistance modifier and a preparation method thereof. The heat-resistance modifier is a methyl methacrylate-alpha-methyl styrene-N-phenylmaleimide terpolymer. Methyl methacrylate and alpha-methyl styrene account for 60 to 80 percent of the total mass of the modifier, N-phenylmaleimide terpolymer accounts for 20 to 40 percent of the total mass of the modifier, and the mass ratio of methyl methacrylate to alpha-methyl styrene is 1:1; and in a polymerization process, the mass ratio of monomer to water is (30-40):(60-70), the polymerization temperature is 60 to 80 DEG C, a peroxide initiator, an alkyl sulfate or alkane sulfonate emulsifier and a thiol molecular weight regulator are added at the same time, the reaction time is 6 to 9 hours, anda pressure type spray dryer is used for spray drying in a post-treatment process. Compared with the conventional heat-resistance modifier, the performance is high, the form of product particles is desirable, the yield is high, fewer raw material varieties are adopted, the cost is low, the spray drying post-treatment process is simple, and the Vicat softening point of the prepared heat-resistance modified resin is obviously improved, and the processability is high.

The invention provides a highly crystalline modified PGA material and a preparation method thereof. The modified PGA material is prepared from the following raw materials in parts by weight: 70-80 parts of polyglycolic acid resin, 5-15 parts of filler, 4-25 parts 1 part of plasticizer and 0.5 to 1 part of nucleating agent; the plasticizer is a mixture of polyvinyl alcohol and glycerin with a mass ratio of 1:1.8 to 2.3, the molecular weight of polyvinyl alcohol is 300 to 500 g / mol, and the degree of alcoholysis ≥ 98 %; the nucleating agent is selected from one or more of talcum powder, inositol and sebacic acid xylene hydrazide; the filler is selected from one or more of nano-montmorillonite, nano-calcium carbonate and food-grade starch. The polyglycolic acid resin is modified by using the above-mentioned plasticizers, nucleating agents and fillers, so that the modified PGA material has high crystallization performance and can be used for the preparation of high heat-resistant products. The Vicat softening temperature is 205-210°C; the half-crystallization time is 5-15s; the relative crystallinity is 45-47%.