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.