Preparation method of polypropylene rod and post-processing equipment used in the method

A polypropylene post-processing technology, which is applied in the field of polymer preparation, can solve the problems of reducing the impact performance of polypropylene rods, the reduction of material fracture absorption capacity, the reduction of crystallinity and storage modulus, etc., to achieve increased performance stability and excellent mechanical properties. Performance, effect of good oxidation resistance

Active Publication Date: 2017-10-17
江苏多淇医疗设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, for polypropylene rods, the post-treatment temperature exceeds 100°C, generally 120-150°C. It is mainly believed that at this temperature, polypropylene can be further crystallized to increase strength, but this is a material fracture. Decreased absorption capacity and secondary crystallization defects reduce the impact performance of polypropylene rods; the existing post-processing time is longer, reaching dozens of hours, which will lead to a decrease in crystallinity and storage modulus
At the same time, if the cooling process after heat treatment is not properly controlled, it will weaken or even subvert the favorable results of the heat treatment process.
[0007] At present, the post-processing method of polypropylene rods is to stack the cut polypropylene rods and put them into an oven for treatment. This has a serious problem, that is, the uneven heating of each polypropylene rod leads to inconsistent and unstable product performance. No description of this issue is found in ; and the existing treatment interrupts the continuity of production

Method used

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  • Preparation method of polypropylene rod and post-processing equipment used in the method
  • Preparation method of polypropylene rod and post-processing equipment used in the method
  • Preparation method of polypropylene rod and post-processing equipment used in the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one: the synthesis of thiocyanate-1-(2-aminophenyl)ethanone

[0032] With 2-aminophenylacetic acid, potassium thiocyanate as raw material, copper phthalocyanine as catalyst, its reaction is as follows:

[0033] (1) Add 5 grams of 2-aminophenylacetic acid, 1.02 grams of potassium thiocyanate, 0.01 g of copper phthalocyanine and 4 milliliters of toluene into the reactor, and react at 55° C. under nitrogen;

[0034] (2) TLC tracking reaction until complete completion;

[0035] (3) The crude product obtained after the reaction was separated by column chromatography (petroleum ether:ethyl acetate=10:1) to obtain the target product thiocyanato-1-(2-aminophenyl)ethanone.

Embodiment 2

[0036] Example 2: Preparation of Flame Retardant Filler

[0037] Prepared by:

[0038] Add expandable graphite to the ethanol solution of 0.08M tetraphenylphosphine bromide so that the molar ratio of phosphorus to expandable graphite is 0.05:1, stir and fully mix and then put it into a container and seal it. The filling degree is 70%. The container was heated at 100°C for 4 hours, cooled naturally to room temperature, and the resulting product was freeze-dried, and then sintered in a muffle furnace at 800°C for 110 minutes under a nitrogen atmosphere to obtain a solid; then the solid was crushed and passed through a 150-mesh sieve to obtain The undersize is added to a mixture of vinyl glycol ether and acetone to form a reaction solution, and the reaction solution is suction filtered after reflux for 30 minutes, and the obtained filter cake is a flame-retardant filler after drying; the undersize, vinyl ethyl The mass ratio of glycol ether to acetone is 100:50:130.

Embodiment 3

[0039] Embodiment three: preparation of auxiliary filler

[0040] Prepared by:

[0041] Mix silicon dioxide, aluminum phosphate, and white clay uniformly in a mass ratio of 100:50:8, and sinter in a muffle furnace at 800°C for 4 hours to obtain a solid; then crush the solid and pass it through a 150-mesh sieve, and take the The bottom is the auxiliary filler.

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Abstract

The invention relates to a preparation method of a polypropylene rod and post-processing equipment for the preparation method. A polypropylene composition is subjected to extrusion molding by extrusion equipment, cut by cutting equipment and subjected to post-processing by the post-processing equipment to obtain the polypropylene rod; polypropylene of which the molecular weight is 3000 to 4000, thiocyano-1-(2-aminophenyl) ethanone, a flame retardant filler, an auxiliary filler and a melting index regulator are mixed to obtain the polypropylene composition; three independent devices, namely a heating device, a cooling buffer device and a cooling device, are arranged in sequence to form the post-processing equipment. The preparation method disclosed by the invention is wide in raw material source and simple and controllable in preparation process, only requires normal operation of the post-processing equipment, and further realizes continuous production of rod forming, cutting and post-processing for the first time, thereby being liable to industrialization.

Description

technical field [0001] The invention belongs to the field of polymer preparation, and in particular relates to a method for preparing a polypropylene rod and post-processing equipment used in the method. Background technique [0002] With the development of science and technology, the production technology of various plastic products is becoming more and more mature, and has been widely used in people's lives. Among them, plastic rods are important and widely used plastic varieties. With the development of chemical technology, various Plastic rods prepared from this kind of plastic raw material are widely used in chemical industry, electronics, exhibition and shop equipment, construction industry, lighting industry, furniture industry and in the advertising industry. [0003] Polypropylene, as one of the most conventional plastics, can be seen everywhere in military, civil, and engineering applications. Polypropylene rods made of polypropylene particles have low density, ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K13/06C08K9/04C08K9/00C08K7/24C08K3/36C08K3/32C08K3/34C08K5/36B29C47/00B29C71/02
Inventor 张晔凯
Owner 江苏多淇医疗设备有限公司
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