Abstract: The present invention relates to a polycarbonate alloy material, a preparation method therefor and a use thereof. The polycarbonate alloy material includes the following components in parts by weight: 10-99.9 parts of a polycarbonate resin, 5-50 parts of a styrene resin, 0.05-2 parts of a modified metal hydroxide, 1-30 parts of a toughening agent, and 0.01-2 parts of a stabilizer; the modified metal hydroxide is a metal hydroxide subjected to surface treatment with dimethylsiloxane and/or methylphenylsiloxane; and the styrene resin is at least one of a styrene-acrylonitrile copolymer or a styrene-butadiene-styrene copolymer. The polycarbonate alloy material has a low combustion rate as well as excellent mechanical properties and appearance, and can be widely used in fields such as electronic and electrical appliances, transportation, household appliances, and aerospace.

Abstract: The present invention provides a bio-based succinic acid composition, a preparation method therefor, and use thereof. The bio-based succinic acid composition includes bio-based succinic acid and a readily oxidizable substance; and a content of the readily oxidizable substance in the bio-based succinic acid composition is ?0.32 mL/g. In the present invention, the bio-based succinic acid composition has a long shelf life, a small change in b value after aging, and good aging stability. Moreover, a polyester prepared from the bio-based succinic acid composition has a lower acid number, a whiter color, and a higher molecular weight.

Abstract: The present invention provides a bio-based succinic acid composition, a preparation method therefor, and a polyester prepared therefrom. The bio-based succinic acid composition includes bio-based succinic acid and a metal ion; and a mass content of the metal ion in the bio-based succinic acid composition is 10-350 ppm. In the present invention, by adopting the bio-based succinic acid composition containing the metal ion as a raw material for the polyester and controlling the content of the metal ion in the bio-based succinic acid composition within a specific range, the obtained polyester has better mechanical properties and heat retention stability.

Abstract: The present invention provides a succinic acid composition, a polyester prepared therefrom, and a polyester composite material. The succinic acid composition includes succinic acid, a compound containing a sulfate radical, and a phosphorus compound; a mass content of the sulfate radical in the succinic acid composition is 240-500 ppm; and a mass content of a phosphorus element in the succinic acid composition is 0.5-40 ppm.

Abstract: The present disclosure provides a PBT resin, comprising an end group containing an acylurea group, where a content of the end group containing the acylurea group in the PBT resin is in a range of 0.5-10 mol/t, and a content of a carboxyl end group in the PBT resin is less than or equal to 20 mol/t. The PBT resin of the present disclosure is capped with a capping agent containing an aromatic carbodiimide functional group, and contains the carboxyl end group with a content of less than or equal to 20 mol/t, thereby obtaining PBT with a certain proportion of ?-form crystal and excellent mechanical properties.

Abstract: A biodegradable polyester composition, a preparation method therefor and use thereof are provided. The biodegradable polyester composition of the present invention includes a biodegradable polyester and a titanium element. Polymerizable monomers of the biodegradable polyester include: an aromatic dicarboxylic acid or an esterified product thereof, or a mixture thereof; an aliphatic dicarboxylic acid or an esterified product thereof, or a mixture thereof; a dihydroxy compound; and a chain extender. A content of the titanium element in the biodegradable polyester composition is 55-86 ppm; and an acid number of the biodegradable polyester composition is 1.10-1.96 mg KOH/g.

Abstract: An aliphatic-aromatic polyester composition, a polyester fiber, a preparation method therefor and use thereof are provided. The aliphatic-aromatic polyester composition includes the following components: i) an aliphatic-aromatic polyester based on aliphatic and aromatic dicarboxylic acids and an aliphatic dihydroxy compound; and ii) a titanium element, wherein calculated based on a weight of the aliphatic-aromatic polyester composition, a content of the titanium element is 55-88 ppm, and an acid number of the aliphatic-aromatic polyester composition is ?0.84 mg KOH/g according to the standard DIN EN 12634-1998.

Abstract: A polyamide molding composition is provided, including the following components in parts by weight: a PAXC/YC resin in 40 parts to 75 parts, a white pigment in 30 parts to 60 parts, and a dispersing agent in parts by weight that are 1.5% to 5% of the parts by weight of the white pigment; based on a molar percentage of the PAXC/YC, the PAXC/YC resin includes 60 mol % to 100 mol % of an XC unit and 0 mol % to 40 mol % of a YC unit; the XC unit consists of a 1,4-cyclohexanedicarboxylic acid unit and a diamine unit; the YC unit consists of a 1,4-cyclohexanedicarboxylic acid unit and a diamine unit.

Abstract: The present invention belongs to the technical field of quantum-dot diffusion plates, and particularly relates to a quantum-dot diffusion plate, and a preparation method therefor and the application thereof. The quantum-dot diffusion plate comprises a diffusion layer, a quantum dot layer and a transparent layer, wherein the quantum dot layer is arranged between the diffusion layer and the transparent layer. The design of the diffusion layer and the transparent layer, which are respectively at the upper portion and lower portion, can ensure that quantum dots are protected by the upper and lower layers as well as ensuring a lighting effect of the diffusion plate, thereby preventing the quantum dots from inactivation caused by the impact of external factors during the use and storage of the quantum dots, and improving the brightness retention rate.

Abstract: The present invention discloses a polyester, a preparation method therefor and use thereof. The polyester includes repeating units derived from the following components: a first component A, based on the total molar weight of the first component A, including: a1) 81-100 mol % of succinic acid, or an ester derivative thereof or an anhydride derivative thereof, and a2) 0-19 mol % of a dicarboxylic acid other than succinic acid, or an ester derivative thereof or an anhydride derivative thereof; a second component B: 1,4-butanediol; and a third component C: a dimer(1,4-butanediol); based on the total molar weight of the first component A, the molar content of the repeating unit —CH2CH2CH2CH2—O— in the third component C is 0.05-3.0 mol %. In the present invention, the molar content of the repeating unit —CH2CH2CH2CH2—O— in dimer(1,4-butanediol) is controlled to 0.05-3.0 mol %, and thus, the resin color of the polyester can be effectively improved.

Abstract: The present disclosure relates to a polypropylene composition resistant to thermo-oxidative aging, a preparation method and a use thereof. The polypropylene composition resistant to thermo-oxidative aging comprises polypropylene, a toughener, a filler, carbon black and other additive or additives. The polypropylene composition resistant to thermo-oxidative aging provided in the present disclosure has a better thermo-oxidative aging resistance by adding specific carbon black, without any complicated surface modification for the carbon black, and the polypropylene composition can be widely used in auto parts or cables.

Abstract: Disclosed are a semi-aromatic polyester, and a preparation method therefor and a use thereof. In the present invention, on the basis of the total molar amount of diacid, the molar content of a repeating unit —CH2CH2CH2CH2—O— in dimer(1,4-butanediol) is controlled to be 0.05-0.35 mol %, which can effectively improve the resin color of the semi-aromatic polyester.

Abstract: The present invention discloses a semi-aromatic polyester, and a preparation method therefor and an application thereof. The semi-aromatic polyester has a specific scope of double bond content. Compared with the existing semi-aromatic polyester, the semi-aromatic polyester of the present invention has better melting heat retention stability and fine color.

Abstract: A polycarbonate (PC) alloy material includes the following components in parts by weight: 40-70 parts of polycarbonate, 20-40 parts of polyethylene terephthalate (PET), and 0.1-2 parts of a metallic compound. The metallic compound is selected from any one or more of a metal oxide, a metal alkali or a metal salt. The metal is selected from any one or more of copper, iron, magnesium, calcium, titanium, antimony, sodium or potassium. A certain amount of PET and a specific metallic compound are added to the polycarbonate; the prepared polycarbonate alloy material has excellent chemical resistance, and meanwhile has a high melt strength and a low melt cooling rate, and thus is suitable for the production of large thick-walled packaging container products via extrusion blow molding.

Abstract: The present invention discloses a semi-aromatic polyester, a preparation method therefor and use thereof. The content of hydroxyl in a semi-aromatic polyester is controlled, and particularly, the content of hydroxyl linked to aliphatic dicarboxylic acid in the semi-aromatic polyester is controlled to 17-40 mmol/kg, the content of hydroxyl linked to aromatic dicarboxylic acid in the semi-aromatic polyester is controlled to 17-40 mmol/kg, and the total content of hydroxyl is controlled to 35-80 mmol/kg, such that the compatibility of the semi-aromatic polyester with materials, e.g., polylactic acid can be significantly improved, thereby obtaining a high-strength tear-resistant film material.

Abstract: The invention relates to a PC resin material with a neutral filtering effect, and a preparation method therefor and the use thereof. The PC resin material with a neutral filtering effect provided in the present invention comprises polycarbonate, an antioxidant, a dispersing agent and an additive. The PC resin material with a neutral filtering effect provided in embodiments of the present invention has a flat transmittance curve at a spectral band of 400-1000 nm, a better neutral filtering effect and the advantages of easy machinability and low costs, and can be widely applied to the preparation of optical products.

Abstract: A method with typical green and low-carbon characteristics for preparing recycled polyester by closed-loop recycling of waste polyester is disclosed. The method includes subjecting the waste polyester to depolymerization by using a specific depolymerization catalyst; removing a polyol solvent from a depolymerization product, and removing a by-product by purification to obtain a depolymerization monomer; mixing the depolymerization monomer with a binary acid, a polyol, a polymerization catalyst, and a chain extender to carry out an esterification reaction; and then adding a stabilizer and a catalyst for condensation polymerization to obtain the recycled polyester. The method of the present invention has low depolymerization temperature, high efficiency, low use amount of the polyol solvent, and extremely low content of a by-product.

Abstract: The present invention relates to a semi-aromatic polyether ester, a preparation method therefor and use thereof. The semi-aromatic polyether ester includes repeating units derived from the following components: a first component A, based on the total molar amount of the first component A, including: a1) 35-65 mol %, and preferably 40-60 mol % of at least one aliphatic dicarboxylic acid or an ester derivative thereof, or an anhydride derivative thereof, and a2) 35-65 mol %, and preferably 40-60 mol % of at least one aromatic dicarboxylic acid or an ester derivative thereof, or an anhydride derivative thereof; a second component B: 1,4-butanediol; and a third component C: poly(1,4-butanediol) having a molecular formula of HO—(CH2CH2CH2CH2—O)n—H, where n is an integer from 2 to 200; based on the total molar weight of the first component A, the molar content of the repeating unit-CH2CH2CH2CH2—O— in the third component C is 1.5-5.

Abstract: Disclosed are a polypropylene composite material capable of blasting at a low temperature, and a preparation method therefor and application thereof. The polypropylene composite material comprises the following components in parts by weight: 35-75 parts of special polypropylene A, 3-10 parts of special polypropylene B, 15-30 parts of a filler, 2-10 parts of a special toughening agent, 15-25 parts of a toughening agent, 0.1-0.3 part of a lubricant, 0.1-0.3 part of a photostabilizer, and 0.2-0.6 part of an antioxidant, wherein the special toughening agent comprises ultrahigh molecular weight polyethylene and a metallocene ethylene-propylene copolymer. The polypropylene composite material that is capable of blasting at a low temperature and has good rigidity is prepared by using the special polypropylene A, the special polypropylene B, and the special toughening agent in combination with the normal filler and the normal toughening agent, and the polypropylene composite material has a wide application prospect.