Kingfa Sci. & Tech. Co., Ltd.

The present invention provides a polyamide composite material and an application thereof. The polyamide composite material includes, in parts by mass, the following components: 35-82 parts of a polyamide resin, 5-45 parts of a reinforcing material, and 5-25 parts of an organic phosphonate flame retardant. A water-soluble acid value of the organic phosphonate flame retardant is 0.1-0.3 mg KOH/g. According to the present invention, by adopting an organic phosphonate flame retardant with a low acid value, occurrence of dialkylphosphinic acid released during decomposition in a high-temperature process can be slowed down, so that the quantity of mold deposits produced by the polyamide composite material in an injection molding process is significantly reduced, thereby improving injection molding production efficiency. Meanwhile, the polyamide composite material has a significantly reduced content of water-boiling precipitates, and excellent heat and humidity resistance stability, which prolongs its service life under hot and humid conditions.

The present invention provides a polymer additive and a preparation method therefor, and a polymer composition containing the same. The preparation method includes: allowing an aqueous solution of a hypophosphite and an antioxidant to carry out a free radical reaction with ethylene in the presence of an initiator to obtain an aqueous solution of a diethylphosphinate; mixing the aqueous solution of the diethylphosphinate, an aqueous solution of a metal salt, and an alkali solution to carry out a reaction under a condition of a pH value of 3.5-3.8 to obtain a diethylphosphinate metal salt slurry; and mixing and stirring the diethylphosphinate metal salt slurry and a flocculant to obtain a diethylphosphinate metal salt flocculate, and performing filtering, washing, and drying to obtain the polymer additive. According to the present invention, through the design of the preparation method, the polymer additive with a low acid value and high thermal stability can be obtained. When used as a flame retardant to prepare the polymer composition, the polymer additive can reduce mold scale during injection molding and enable the polymer composition to have less water boiling precipitate, thereby improving the stability of the polymer composition under damp-heat conditions.

The present invention provides a polymer additive, and a preparation method and an application thereof. The preparation method comprises the following steps: subjecting an aqueous hypophosphorous acid solution and an antioxidant to a free radical reaction with ethylene under the action of an initiator to obtain an aqueous diethylphosphinic acid solution; subjecting the aqueous diethylphosphinic acid solution, sulfuric acid, and a metal hydroxide to a reaction, followed by adding an alkaline solution to obtain a diethylphosphinate slurry with a pH value of 3.8-4.2; and mixing the diethylphosphinate slurry with a flocculant and stirring to obtain a diethylphosphinate flocculate, followed by filtering, washing, and drying to obtain the polymer additive. According to the present invention, through the design of the preparation method, a polymer additive with a low acid value can be obtained. When used as a flame retardant in preparation of a polymer material, the polymer additive can inhibit auxiliary precipitation during high-temperature processing, reduce mold deposits, and enable a prepared polymer composition to have a lower content of water-boiling precipitates, thereby improving its service life under hot and humid conditions.

The present invention provides an aliphatic polyester, a polyester composition containing the same, and use thereof. The aliphatic polyester includes a dicarboxylic acid residue, a diol residue, and a branching agent residue; the dicarboxylic acid residue includes the following residues: a1) based on a total molar percentage content of a1) and a2) as 100 mol%, 71-89 mol% of a succinic acid residue; and a2) based on the total molar percentage content of a1) and a2) as 100 mol%, 11-29 mol% of a sebacic acid residue; the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue; and based on a total mass of the aliphatic polyester as 100 wt%, a mass percentage content of the branching agent residue is 0.09-0.22 wt%. The aliphatic polyester solves the problem of low heat sealing strength of aliphatic polyesters.

The present invention provides an aliphatic polyester and use thereof. The aliphatic polyester includes a dicarboxylic acid residue and a diol residue; the dicarboxylic acid residue includes the following residues: a1), based on a total molar percentage content of a1) and a2) as 100 mol%, 65-90 mol% of a succinic acid residue; and a2), based on the total molar percentage content of a1) and a2) as 100 mol%, 10-35 mol% of a sebacic acid residue; the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue; and the aliphatic polyester includes an oligomer with a number-average molecular weight < 1,000 as measured by gel permeation chromatography (GPC), and a mass percentage content of the oligomer with the number-average molecular weight < 1,000 as measured by GPC in the aliphatic polyester is 0.08-3.5 wt%. A packaging film prepared from the aliphatic polyester possesses both good food contact performance and unwinding performance.

The present invention provides an aliphatic polyester, a polyester composition containing the same, and use thereof. The aliphatic polyester includes a dicarboxylic acid residue and a diol residue; the dicarboxylic acid residue includes the following residues: a1) based on a total molar percentage content of a1) and a2) as 100 mol%, 61.2-69 mol% of a succinic acid residue; and a2) based on the total molar percentage content of a1) and a2) as 100 mol%, 31-38.8 mol% of a sebacic acid residue; and the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue. In the present invention, the aliphatic polyester has good uniformity in terms of transverse and longitudinal tear resistance, high tensile strength, and a short biological disintegration period under home composting conditions, thereby meeting home composting requirements.

The present disclosure discloses a polymer additive, a flame retardant, a polymer molding material, and a preparation method and a use thereof. The polymer additive comprises aluminum diethylphosphinate and aluminum ethylbutylphosphinate; the polymer additive satisfies a relationship of 0.90 ≤ ΔH ≤ 1.05, wherein ΔH is a dual enthalpy ratio and defined by Equation (1); the polymer additive further satisfies following relationships: 135 °C ≤ T1 ≤ 160 °C, 165 °C ≤ T2 ≤ 185 °C, and 180 °C ≤ T3 ≤ 200 °C; and the Equation (1) is as follows: ΔH = (H2+H3)/H1. The polymer additive has a specific crystal transition state, and a polymer molding material comprising the polymer additive has lower molding shrinkage during the molding process.

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. By compounding the compound containing the sulfate radical with the phosphorus compound at specific contents to prepare the polyester using the succinic acid composition as a raw material, not only can the production efficiency of the polyester be ensured to obtain the polyester with both a low acid number and a high viscosity, but also the corrosion of metal equipment caused by the polyester or a composition thereof during extrusion of the polyester composite material can be reduced to ensure the quality of the polyester composite material.

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.

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