摘要:
Provided are a long fiber-reinforced polypropylene resin composition and its moldings which have a high rigidity, impact resistance and durability, and especially have an extremely good repeated impact resistance and creep resistance, and are therefore suitable for various parts including automobile parts and other industrial parts. The long fiber-reinforced polypropylene resin composition comprises from 35 to 75% by weight of a matrix polymer and contains from 25 to 65% by weight of long glass fibers having a length of from 2 to 50 mm, in which the matrix polymer is a modified propylene homopolymer or a modified propylene-ethylene copolymer prepared by modifying a propylene homopolymer having an isotactic pentad fraction (P) of at least 96% and Mw/Mn (Q) of at most 6, or a crystalline propylene-ethylene copolymer composed of homopolymer segments having an isotactic pentad fraction (P) of at least 96% and Mw/Mn (Q) of at most 6 and propylene-ethylene copolymer segments, with an unsaturated carboxylic acid or its anhydride, or a mixture of the modified propylene homopolymer or propylene-ethylene copolymer and the non-modified propylene homopolymer or crystalline propylene-ethylene copolymer, and has a melt flow rate (230° C., 21.18 N) of at least 50 g/10 min. The resin composition is molded into moldings, optionally after diluted with a diluent of an ordinary propylene-based (co)polymer.
摘要:
Provided are a long fiber-reinforced polypropylene resin composition which provides a molded article excellent in a mechanical strength and an impact resistance and having a small anisotropy in a strength, so that it can suitably be used even for uses in medium-sized to large-sized molded articles, and a molded article obtained from the same. The long fiber-reinforced polypropylene resin composition comprises 35 to 75% by weight of a matrix polymer comprising a modified propylene homopolymer (A1) which is prepared by modifying a propylene homopolymer with an unsaturated carboxylic acid or a derivative thereof and which has an isotactic pentad ratio (P value) of 96% or more, a melt flow rate (230° C., 21.18N) of 80 g/10 min or more and an Mw/Mn (Q value) of 3.5 or less and 25 to 65% by weight of a glass long fiber (A2) having a length of 2 to 50 mm.
摘要:
Provided is a long fiber-reinforced polypropylene resin composition which provides a molded article excellent in a mechanical strength and an impact resistance and having a small anisotropy in a strength, so that it can suitably be used even for uses in medium-sized to large-sized molded articles. The long fiber-reinforced polypropylene resin composition comprises 40 to 85% by weight of (A) a long fiber-reinforced propylene homopolymer pellet shown below and 15 to 60% by weight of (B) a propylene base block copolymer resin having the MFR of 50 g/10 min or less: (A): a long fiber-reinforced propylene homopolymer pellet comprising, (A1): 20 to 64.9% by weight of a modified propylene homopolymer obtained by modifying a propylene homopolymer with unsaturated carboxylic acid or an anhydride thereof or a mixture of the above modified propylene homopolymer and an unmodified propylene homopolymer, wherein an MFR is 60 g/10 min or more, (A2): 0.1 to 5% by weight of at least one selected from the group consisting of simple substances, hydroxides and oxides of alkaline earth metals, and (A3): 35 to 75% by weight of glass long fiber having a length of 2 to 50 mm.
摘要:
The present invention provides a cleaning composition for a resin molding machine which comprises 50 to 95% by weight of a polyolefin resin having a melt index of 0.01 to 0.5, 0.1 to 15% by weight of an acrylic copolymer, 2 to 30% by weight of a neutral salt of organic sulfonic acid and 0.1 to 10% by weight of basic magnesium carbonate, magnesium hydroxide, potassium carbonate, zinc carbonate or a mixture of two or more thereof.This composition is suitable for the cleaning of the molding machine at a time of changeover of super-engineering plastics at the molding temperature of the plastics which is about 400.degree. C.
摘要:
A fiber-reinforced thermoplastic resin composite material comprises a thermoplastic resin, 5 to 80% by weight of a fiber reinforcing material having an average diameter ranging from 3 to 21 .mu.m and an average length ranging from 0.3 to 30 mm, and 0.01 to 5% by weight of carbon black whose aggregate size upon primary cohesion is not more than 60 nm. The composite material permits effective prevention of any snapping of glass fibers for reinforcement in molded articles which are colored black or gray due to the contribution of the carbon black having a specific aggregate size incorporated into the resin along with the fiber reinforcing material. Therefore, the composite material can provide molded articles excellent in mechanical strength, for instance, all of tensile strength, flexural strength and Izod impact strength.
摘要:
A product is provided in a continuous length formed from a fiber-reinforced resin and having a shape ratio �whole length of the contour of the section (Lmm)/real area of the section (Smm.sup.2)! of 0.5 to 2.5/mm and a thickness of 1 to 4 mm. This product in a continuous length is prominently excellent in tensile strength, though the amount of the fiber reinforcement contained in the product is almost the same as in conventional fiber-reinforced products. Hence, the product in a continuous length is favorably used as a spacer for concrete form.
摘要:
Polypropylene compositions reinforced by glass fibers having superiority in mechanical properties, rigidity and visual appearance are provided by melting and kneading a mixture of (A) polypropylene resin modified by an unsaturated carboxylic acid or an anhydride thereof or a polypropylene resin containing 5 parts by weight or more of polypropylene resin modified by an unsaturated carboxylic acid or an anhydride thereof, (B) a polyamide resin obtained by the polycondensation of metaxylene diamine and adipic acid and (C) glass fibers, each in specified amount.
摘要:
According to the present invention, there is provided a process for stably producing a compositely reinforced polypropylene composition having less warpage deformation and good moldability which includes the steps of using an extruder having at least three feed inlets, feeding an organic peroxide and a polypropylene resin selected from (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of the resulting modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene or (d) mixtures of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber through the third feed inlet, and then melting and kneading these materials.
摘要:
The present invention provides a polypropylene resin composition which permits the formation of materials having high strength and stiffness, less warpage deformation and such excellent mechanical durability that these materials can be used when load is applied continuously for a long term or when load is applied repeatedly.The polypropylene resin composition contains the three components of (a) 40 to 75% by weight of a modified polypropylene obtained by heating and melting a mixture prepared by adding at least (1) 0.01 to 2% by weight of an unsaturated acid, (2) 0.1 to 3% by weight of an unsaturated silane and (3) an organic peroxide to a crystalline polypropylene, (b) 10 to 35% by weight of glass fibers, and (c) 15 to 45% by weight of a mica powder, and the components (b) and (c) are blended with the component (a) so that the total amount of the components (b) and (c) may be in the range of from 25 to 60% by weight based on the composition.