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Polypropylene composition for chemical pipelines and preparation method thereof

A polypropylene composition and chemical pipeline technology, applied in the field of polypropylene composition, can solve the problems of high brittleness, corrosion resistance of the composition, easy brittle cracking and the like

Active Publication Date: 2010-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the base resin in the composition is homopolypropylene, its tensile modulus is ≥1300MPa, the impact resistance at -20°C is only ≥3KJ / m2, and the elongation is only 100-200%. Fluid, the use of CaCO3 in the composition is obviously inappropriate, and the corrosion resistance of the composition is not considered in the composition. In the application of chemical pipelines, the corrosion resistance cannot be ignored; There is no scientific basis for the impact of performance. The burst pressure used in this patent to represent the pressure resistance of the pipeline is not in line with the evaluation of the performance of plastic pipelines.
[0006] Chinese patent CN1473869 discloses a β-type rare earth nucleating agent and its products, mainly the patent of the components of the rare earth β-nucleating agent itself, does not involve the antioxidant system, does not specify the specific application of the compound, and has no specific properties of the product Indicators, not involving gray β-crystal promotion masterbatch, etc.
[0007] Chinese patent CN1361197A discloses a polypropylene composition for hot water pipes. The composition is based on random copolymerized polypropylene (PP-R), there is no β-nucleating agent in the additive, and at least two hindered phenolic anti Oxygen, which does not contain thioester antioxidants, and its products are only used for cold and hot water transportation, the long-term heat resistance temperature generally does not exceed 70 ° C, and the low temperature brittleness is relatively low, the impact resistance is low, and the low temperature is easy to be brittle

Method used

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  • Polypropylene composition for chemical pipelines and preparation method thereof
  • Polypropylene composition for chemical pipelines and preparation method thereof

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preparation example Construction

[0027] The composition preparation method of the present invention comprises following two kinds:

[0028] (1) It is prepared by a two-step method. The first step is to prepare the auxiliary masterbatch first, that is, to mix and granulate the antioxidant, β-nucleating agent and polypropylene carrier to make a masterbatch. The weight of the polypropylene carrier in the masterbatch The number of parts is 80-90, and the parts by weight of other additives are 10-20; the second step is to blend and granulate the additive masterbatch with the remaining PP-H powder or pellets and gray β-crystal accelerator masterbatch .

[0029] (2) It is prepared by one-step method. After mixing PP-H powder or pellets, β-nucleating agent, antioxidant and gray β-crystal promoting masterbatch, it is directly granulated.

[0030] The PP-H composition prepared by the above method has good aging resistance, heat resistance, chemical corrosion resistance and creep resistance.

[0031] The composition o...

Embodiment 1

[0033] Embodiment 1 (all parts by weight, hereinafter the same):

[0034] PP-H resin (MFR=0.26g / 10min) 100 parts

[0035] Rare earth nucleating agent WBG 0.1 parts

[0036] [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 0.3 parts

[0037] Tris(2,4-di-tert-butylphenyl)phosphite 0.25 part

[0038] Bis(stearyl alcohol) thiodipropionate 0.2 parts

Embodiment 2

[0040] PP-H resin (MFR=0.26g / 10min) 100 parts

[0041] Rare earth nucleating agent WBG 0.12 parts

[0042] [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 0.3 parts

[0043] Tris(2,4-di-tert-butylphenyl)phosphite 0.25 part

[0044] Bis(stearyl alcohol) thiodipropionate 0.2 parts

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Abstract

The invention discloses a polypropylene composition for chemical pipelines and a preparation method thereof, the composition is endowed with the characteristics, including excellent impact resistance, great chemical corrosion resistance, high heat resistance and heat deflection temperature, good long-term creeping property and extrusion processability and the like, by mixing beta nucleating agentsystem, antioxidant system and gray beta crystal promoting master batch with homopolymerized polypropylene which is generated by gas phase method as basic resin. The composition is mainly applied to manufacturing pipelines and can also be used for producing storage tank and pickling tank and for the transportation and the storage of chemical fluids, and the products thereof are extensively applied to industrial fields, such as electronics, medicines, chemical industry, food, semiconductor, steel, etc.

Description

technical field [0001] The invention relates to a polypropylene composition, especially a polypropylene composition with excellent impact strength, heat aging resistance, heat resistance and long-term creep strength, excellent corrosion resistance, stress crack resistance, pressure resistance and surface wear resistance Polypropylene composition with good properties, structural uniformity and weldability and its preparation method. [0002] The composition of the present invention is mainly used in the delivery system of chemical fluid, for the production of pipes and pipe fittings, and can also be used in the manufacture of plates, chemical storage tanks, pickling tank systems, and its products can be widely used in electronics, pharmaceuticals, chemical , food, semiconductor, steel and other industrial fields. Background technique [0003] Polypropylene has become an important material in industrial applications due to its excellent mechanical properties and chemical corr...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K5/16
Inventor 杜建强赵丽梅赵唤群袁春海祝景云李国田正昕高志武李秀全
Owner CHINA PETROLEUM & CHEM CORP
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