The present disclosure provides an ultralow-glossiness, ultralow-temperature resistant ASA resin composition and preparation method thereof. The composition includes the following components in parts by weight: 2060 parts of an acrylonitrile-styrene-acrylate graft copolymer, 4080 parts of an acrylonitrile-styrene copolymer, 120 parts of an ultralow-glossiness, low temperature resistant modifier, and 0.15 parts of a processing aid. The ultralow-glossiness, low temperature resistant modifier includes a carrier copolymer, a fluorinated copolymer, a low-temperature flexibilizer, a coupling agent, fumed silica and an assistant. The ASA resin composition prepared by the present disclosure has an ultralow-glossiness, can be used to replace mold processing technology such leather marking and texturing, which greatly saves mold cost and processing production cost; and meanwhile it also has excellent low temperature resistance and can be applied in cases having requirements on low temperature resistance and low glossiness such as automobile parts, outdoor profiles, building materials and electrical appliances.

A liquid crystalline polyester resin composition is described, which includes a liquid crystalline polyester; and an amide compound including the following structural units (I) to (III), and having a melting point of 100 C. and a volume average particle diameter of 5 m and 50 m, wherein a content of the amide compound is 0.005 parts by mass and 0.1 parts by mass with respect to 100 parts by mass of a content of the liquid crystalline polyester, structural unit (I): CH.sub.3XCO, X represents an aliphatic hydrocarbon group having 10 carbon atoms or a hydroxy hydrocarbon group in which one or more hydrogen atoms of an aliphatic hydrocarbon group are substituted with a hydroxy group; structural unit (II): HNYNH, Y represents a hydrocarbon group having 2 carbon atoms; structural unit (III): OCZCO, Z represents an aliphatic hydrocarbon group having 4 carbon atoms, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group.

A liquid crystalline polyester resin composition is described, which includes a liquid crystalline polyester; and an amide compound including the following structural units (I) to (III), and having a melting point of 100 C. and a volume average particle diameter of 5 m and 50 m, wherein a content of the amide compound is 0.005 parts by mass and 0.1 parts by mass with respect to 100 parts by mass of a content of the liquid crystalline polyester, structural unit (I): CH.sub.3XCO, X represents an aliphatic hydrocarbon group having 10 carbon atoms or a hydroxy hydrocarbon group in which one or more hydrogen atoms of an aliphatic hydrocarbon group are substituted with a hydroxy group; structural unit (II): HNYNH, Y represents a hydrocarbon group having 2 carbon atoms; structural unit (III): OCZCO, Z represents an aliphatic hydrocarbon group having 4 carbon atoms, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group.

The present invention relates to a processing technology for manufacturing seepage irrigation pipe with alternating effluent sections and non-effluent sections, and in particular, to the field of underground seepage irrigation in agriculture and forestry. The processing technology combines the production unit for water-effluent pipes with the production unit for non-effluent pipes, and produces the seepage irrigation pipeline by adjusting the raw material ratios, controlling the spindle speed, spindle acceleration time, and spindle deceleration time of the two pipeline production units, to generate a seepage irrigation pipe with alternating effluent sections and non-effluent sections. The lengths of the effluent sections and non-effluent sections can be adjusted, the pipe wall thickness can also be adjusted by adjusting the inner and outer diameter of the internal mold of the pipe forming unit, a seepage irrigation pipe with alternating effluent sections and non-effluent sections is environment-friendly, efficient, water-saving, and useful for underground irrigation.

A process for producing moldings from a powder based on thermoplastic elastomers, wherein the powder is placed on a mold or in a mold and by means of electromagnetic radiation is heated to an extent such that the powder undergoes at least partial melting and thus fuses to afford the molding and the frequency of the electromagnetic radiation is between 0.01 GHz and 300 GHz.

A process for producing moldings from a powder based on thermoplastic elastomers, wherein the powder is placed on a mold or in a mold and by means of electromagnetic radiation is heated to an extent such that the powder undergoes at least partial melting and thus fuses to afford the molding and the frequency of the electromagnetic radiation is between 0.01 GHz and 300 GHz.

Molded bodies formed from PA-12 resin lose elasticity by absorbing water and lose strength as a result. Due to this, application to only some products used in low humidity environments is possible, which is a problem that needed to be addressed. This resin powder material, for use in powder laminate molding methods, is characterized in that the resin powder is a polybutylene terephthalate resin which has a crystallization temperature lower than that of homopolybutylene terephthalate resins.

A method for producing a powder comprising at least one polymer for use in a method for the additive manufacture of a three-dimensional object is described. The method includes the step of mechanically treating the powder in a mixer with at least one rotating mixing blade, wherein the powder is exposed to a temperature T.sub.B and T.sub.B is at least 30 C. and is below the melting point T.sub.m of the polymer (determined according to DIN EN ISO 11357) if the polymer is a semi-crystalline polymer, or wherein T.sub.B is at least 30 C. and wherein T.sub.B is at most 50 C. above the glass transition temperature T.sub.g of the polymer (determined according to DIN EN ISO 11357) if the polymer is a melt-amorphous polymer. Compared to a time before the start of the treatment, it may be achieved that after the treatment, the bulk density of the powder is increased by at least 10% (or in the case of polymer, copolymer or polymer blend of polyamide at least 2% and more) and the BET surface area is decreased by at least 10%, and optionally also the pourability is improved by at least 10%.

A method for producing a powder comprising at least one polymer for use in a method for the additive manufacture of a three-dimensional object is described. The method includes the step of mechanically treating the powder in a mixer with at least one rotating mixing blade, wherein the powder is exposed to a temperature T.sub.B and T.sub.B is at least 30 C. and is below the melting point T.sub.m of the polymer (determined according to DIN EN ISO 11357) if the polymer is a semi-crystalline polymer, or wherein T.sub.B is at least 30 C. and wherein T.sub.B is at most 50 C. above the glass transition temperature T.sub.g of the polymer (determined according to DIN EN ISO 11357) if the polymer is a melt-amorphous polymer. Compared to a time before the start of the treatment, it may be achieved that after the treatment, the bulk density of the powder is increased by at least 10% (or in the case of polymer, copolymer or polymer blend of polyamide at least 2% and more) and the BET surface area is decreased by at least 10%, and optionally also the pourability is improved by at least 10%.

The invention relates to a thermoplastic moulding composition containing: A) at least one polycarbonate and/or polyester carbonate each containing structural units derived from bisphenol-A; B) a further polymer different from component A or a mixture consisting of polymers each different from component A, wherein Component B consists of B1) at least one thermoplastic polymer and optionally B2) at least one non-thermoplastic polymer; C) at least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO.sub.3, titanium dioxide, and titanium dioxide in combination with other inorganic pigments, Al(OH).sub.3. AlO(OH), Mg(OH).sub.2 and mica as well as combinations of said fillers; and D) optionally at least one non-polymeric polymer additive and/or at least one non-polymeric processing aid, in each case different from component C, wherein the weight ratio of component B to component C is at least 0.5 and wherein the weight proportion of component B1 in component B is at least 20%, and wherein the moulding composition has a mass fraction of free bisphenol-A of less than 30 ppm. The invention also relates to: a method for producing a moulding composition; the use of the moulding composition to produce a moulded body; and a moulded body containing the moulding composition or consisting of the moulding composition.