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Production method of PPR (Polypropylene) pipe special material

A technology for special materials and production methods for pipes is applied in the field of polypropylene production, which can solve the problems of poor processing performance and difficulty in obtaining a wide molecular weight distribution, and achieve the effects of improving product processing performance and reducing equipment investment and production costs.

Active Publication Date: 2018-11-23
云南云天化石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production method for special materials for PPR pipes, which solves the problem in the prior art that it is difficult to obtain products with a wider molecular weight distribution when using a single reactor to produce special materials for polypropylene pipes, resulting in poor processability of the products

Method used

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Examples

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Embodiment 1

[0025] This embodiment provides a method for producing special materials for PPR pipes, comprising the following steps:

[0026] Reduce the flow rate of catalyst solids to 0.52kg / h, adjust the partial pressure of propylene to 2Mpa, the partial pressure of ethylene to 0.05Mpa, the reaction temperature is 72°C, the pressure is 3.24Mpa, when the hydrogen partial pressure in the reactor is 0.008Mpa, ensure the hydrogen-carbon ratio and Al / Ti control is smooth.

[0027] When the melt index of the extrusion granulation powder is 0.2g / 10min, the extrusion granulation unit uses specific additives for PPR pipe materials and switches to the finished product silo, where the additives include the following components: main antioxidant (1010) added 3000ppm; primary antioxidant (330) 3000ppm; auxiliary antioxidant (168) 800ppm; calcium stearate 500ppm, processing aid (PPA) 300ppm, nucleating agent (NA-82) 200ppm.

[0028] Continuously increase the reaction load to 20t / h. When the melt inde...

Embodiment 2

[0037] This embodiment provides a method for producing special materials for PPR pipes, comprising the following steps:

[0038] Reduce the flow rate of catalyst solids to 0.52kg / h, adjust the partial pressure of propylene to 2Mpa, the partial pressure of ethylene to 0.06Mpa, the reaction temperature is 72°C, the pressure is 3.24Mpa, when the partial pressure of hydrogen in the reactor is 0.008Mpa, ensure the hydrogen-carbon ratio and Al / Ti control is smooth.

[0039] When the melt index of the extrusion granulation powder is 0.2g / 10min, the extrusion granulation unit uses specific additives for PPR pipe materials and switches to the finished product silo, where the additives include the following components: main antioxidant (1010) added 3000ppm; primary antioxidant (330) 3000ppm; secondary antioxidant (168) 800ppm; calcium stearate 500ppm, processing aid PPA 300ppm, no nucleating agent added.

[0040] Continuously increase the reaction load to 20t / h. When the melt index and...

Embodiment 3

[0049] A production method for special materials for PPR pipes. Propylene and ethylene are placed in a fluidized bed reactor in the Unipol gas phase polypropylene process technology for binary random copolymerization. The bed weight of the fluidized bed reactor is 15t , the bed height is 17m, the superficial gas velocity is 0.25m / s, and the product is degassed and granulated, wherein:

[0050] The copolymerization reaction of propylene and ethylene is carried out under the joint action of Cat-A catalyst and external electron donor D-A.

[0051] The Cat-A catalyst is a Z-N series catalyst, and the Z-N series catalyst is based on MgCl 2 as carrier, TiCl 4 As the active center, the internal electron donors are alkyl-substituted 1,3-diethers and aryl-substituted 1,3-diethers;

[0052] The external electron donor D-A is p-dicyclopentyldimethoxysilane and cyclohexylmethyldimethoxysilane;

[0053] During the reaction, the partial pressure of propylene is 1.5Mpa, and the partial pres...

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Abstract

The invention discloses a production method of a PPR (Polypropylene) pipe special material. The production method comprises the following steps: placing propylene and ethylene in a fluidized bed reactor for binary random copolymerization; degassing and granulating the product, wherein the copolymerization of the propylene and the ethylene is carried out under the combined action of a Cat-A catalyst and an external electron donor D-A. By adopting the catalyst system, the product has wider molecular weight distribution and the processing performance of the product is improved greatly through thesynergistic effect of internal and external electron donors.

Description

technical field [0001] The invention relates to the technical field of polypropylene production, in particular to a production method for special materials for PPR pipes. Background technique [0002] Since my country banned the use of galvanized pipes as water supply pipes in new residential buildings in 2000, polypropylene pipes and polyethylene pipes have made great progress. At present, the total annual production capacity of domestic PP-R pipes is about 500,000 tons, but compared with the domestic 875,000 Compared with the market consumption of PP-R pipes per ton per year, there is still a big gap in meeting the market demand for domestic raw materials, and the dependence on foreign materials for special materials is high. There will be steady growth. [0003] At present, the production process of mainstream PPR pipe materials at home and abroad includes ring pipe process, Mitsui Petrochemical process and Ineos gas phase process. Due to the low melting index of PPR pipe ...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/02C08F4/646C08F4/649C08F4/02C08F2/34
CPCC08F210/06C08F210/16C08L23/14C08L2203/18C08F210/02C08F2500/04C08F4/6465C08F4/6494C08F4/022C08F2/34
Inventor 陈廷勇方鹤夏俊龙德晓严凌郑飞杨蕾
Owner 云南云天化石化有限公司
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