40results about How to "Improve weld line strength" patented technology

The invention discloses a liquid crystal polymer composition, a preparation method and application thereof. The liquid crystal polymer composition is prepared from the following components in percent by mass: 30-60 percent of liquid crystal polymer, 15-35 percent of inorganic reinforcing agent, 5-35 percent of filler and 2-5 percent of toughening component, wherein the toughening component comprises silicone powder and fluorochemicals. The liquid crystal polymer composition has better flexibility and weld mark strength, and overcomes the defects of low weld mark strength and easiness in crispness of the traditional TLCP (talline polymer).

A resin reservoir capable of storing the melted resin is provided in the pillar radially facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among a plurality of the pillars not provided with the resin injection gate or the pillar in the vicinity of the pillar facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among the plurality of the pillars not provided with the resin injection gate. A cross-sectional area of a communicating portion of the resin reservoir which communicates with the pillar is smaller than the smallest of cross-sectional areas of a plurality of the resin injection gates.

The invention relates to PC / ABS alloy being excellent in appearance and high in strength of weld lines and a preparation method thereof. The alloy includes the following components, by weight: 50-80 parts of PC resin, 20-45 parts of ABS resin, 0.5-5 parts of a composite compatilizer, 2-5 parts of a toughening agent, 0.1-2 parts of an anti-oxidant and 0.1-2 parts of a lubricant. The composite compatilizer is a composition composed of a styrene-acrylonitrile-glycidyl methacrylate random copolymer and a peroxide-grafted styrene-acrylonitrile copolymer. Compared with the prior art, two special compatilizers, SAG and ROOR'-g-SAN, are compounded and then are added to the PC / ABS alloy, so that when two material flows are mixed, phase interface thickness of ABS is increased by means of the GMA while the phase interface thickness of PC is increased by means of the peroxide in the PC / ABS alloy due to existence of the GMA and the peroxide functional group, thereby improving the strength of the weld lines of the material. The SAN ensures excellent compatibility of PC and ABS, so that the material has excellent appearance of weld lines. Not only is total performance of the material influenced but also a product being excellent in appearance can be produced.

The invention relates to a polypropylene composite material capable of improving mechanical properties of weld lines. The composite material comprises the following components in parts by weight: 26.6-71.8 parts of polypropylene A, 5-10 parts of polypropylene B, 5-10 parts of polypropylene C, 2-10 parts of an elastomer, 10-30 parts of talc powder, 5-10 parts of a mineral, 1-3 parts of a dispersant and 0.2-0.4 part of an antioxidant. A preparation method of the composite material comprises the following steps: preparing polypropylene A, polypropylene B, polypropylene C, the elastomer, talc powder, the mineral, the dispersant and the antioxidant according to the parts by weight, placing in a high-speed mixer and fully mixing to obtain a mixture, placing the mixture in a twin-screw extruder, extruding and granulating and carrying out online vacuum to obtain the polypropylene composite material. Compared with the prior art, the preparation method is simple, wide in sources of raw materials and low in cost and is suitable for mass production; and the prepared polypropylene composite material has the advantages of excellent weld line strength and low volatile characteristics, can replace the existing talc powder reinforcing material and has good application prospects.

The invention provides a polypropylene material with high weld line strength and a preparation method thereof. The polypropylene material is composed of the following components: polypropylene resin, polypropylene grafted MAH, modified hyperbranched polyester, filler and other additives. The present invention adds modified hyperbranched polyester, and the polymer contains polar functional groups such as ‑OSOO‑, ‑N‑, ‑O‑, and can form strong bonds with interface modifiers and modified fillers through hydrogen bonds and polar bonds. Interface binding. In addition, the polymer contains a long-chain hyperbranched structure with large steric hindrance. These two aspects weaken the orientation of the modified filler and the polypropylene chain structure along the vertical flow direction, and strengthen the bridging structure of the weld line interface, thereby improving the weld line strength of the polypropylene material.

The invention provides a high weld mark strength reinforced polypropylene material and a preparation method thereof. The high weld mark strength reinforced polypropylene material consists of 30 to 90 percent of polypropylene (PP) resin with a melt index range of between 0.5 and 100 g / 10min (230 DEG C, 2.16 kg), 5 to 50 percent of fiberglass treated by a surfactant, 0.5 to 5 percent of mineral filler treated by a surfactant, 0.5 to 10 percent of interface modifier and 0.5 to 5 percent of other additives. As the mineral filler, the interface modifier and the fiberglass are added into the polypropylene material and strong interface combination is formed between the interface modifier, the fiberglass and the polypropylene, the viscosity of disperse phase is improved and the orientation of a polypropylene molecular chain and fiberglass along the vertical flowing direction is blocked, so that the strength of a weld mark of the polypropylene material is improved.

The invention discloses a polyethylene / polycarbonate alloy with high weld line strength, which comprises the following components in parts by weight: 5-40 parts of polyethylene; 40-85 parts of polycarbonate; ethylene copolymer compatibilizer 1 ‑15 servings. High weld line strength Polyethylene / polycarbonate alloy has the advantages of high weld line strength, good melt index, and good heat aging resistance.