GLP S.R.L

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 bone fixation screw (10) for spinal implantation features an elongated body (11) that extends between two opposite ends: the first end (14) and the second end (16). The elongated body (11) is designed with a first threaded portion (13) at the first end (14), a second threaded portion (15) at the second end (16) and a nonthreaded intermediate portion (17) with constant diameter (D) between said threaded portions (13, 15). Additionally, there is a fixation kit (30) that includes multiple fixing screws (10) and several screw-to-rod connection elements (20, 60).

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 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, 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.

Shock absorbing device (10) for a seat (51) installed on a vehicle and comprising at least a first telescopic element (11) connected to the seat (51), a second telescopic element (12) connected to the vehicle and configured to slide axially with respect to the first (11), and an elastic unit (13) disposed between the first telescopic element (11) and the second telescopic element (12), and configured to define a reciprocal elastic sliding between the first telescopic element (11) and the second telescopic element (12); the elastic unit (13) comprises at least a first portion (P1) having a first elastic coefficient (k1) and at least a second portion (P2) disposed in functional continuity with the first portion (P1) and having a second elastic coefficient (k2) different from the first elastic coefficient (k1).

The present application discloses a splicing mechanism for a seat unit and a seat unit. The splicing mechanism for the seat unit includes a fixed frame, including a first fixed frame and a second fixed frame provided adjacent to each other; a first splicing assembly, including a first splicing member and a second splicing member provided on the first fixed frame; a second splicing assembly, including a first splicing groove and a second splicing groove provided on the second fixed frame, the opening directions of which are arranged in an intersecting manner. In the present application, through the opening direction of the first splicing groove intersecting with the opening direction of the second splicing groove, so as to enable, during splicing, the first splicing member to be firstly aligned with the first splicing groove, then the second fixed frame to be rotated, driving the first splicing member to cooperate with the first splicing groove and the second splicing member to cooperate with the second splicing groove, thereby quickly completing mutual connection between the first fixed frame and the second fixed frame, optimizing alignment operations during the splicing process, effectively reducing workload, and facilitating a single person in performing splicing work between two seat frames.

Method for manufacturing an anatomical chamois (10), comprising disposing a shaped padding (12, 112) in a positioning seating (22, 23) of a support plane (20), disposing an extendable shaped cover (11) over the padding (12, 112), wherein the cover (11) is subjected to traction and extended longitudinally, attaching the cover (11) on the support plane (21) in an extended condition, and joining together the padding (12, 112) and the extended cover (11). The invention also concerns equipment (20) for manufacturing the chamois (10, 110) and a corresponding chamois (10, 110).