Low-odor high-transparency ultrahigh flowability polypropylene as well as preparation device and method thereof

A low-odor and fluid technology, applied in the field of modified plastics, can solve the problems of low ash, chemical degradation agent residues, low fluidity, etc., and achieve the effect of low yellow index

Pending Publication Date: 2019-03-22
大韩道恩高分子材料(上海)有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the ultra-high fluidity polypropylene products produced through the degradation of polypropylene by peroxide free radical initiators contain more initiator residues and small molecule by-products formed by free radical degradation reactions, resulting in product degradation. The content of volatile organic compounds (VOC) is high, and the odor level generally exceeds the hygienic requirements of the industry. Respiratory protective equipment carrying a large amount of organic small molecules and aromatic substances is bound to be inhaled into the body during use by consumers. affect the health of
With the diversification and high-end trend of people's aesthetic pursuit, the market demand for high-transparency non-woven products is developing rapidly. The demand is increasing, and the ultra-high fluidity polypropylene products produced by the existing technology often have poor transparency and high haze, which affects the promotion and use of non-woven fabrics in these fields
[0004] Chinese patent document CN103571039B discloses a high melting index polypropylene composition and a preparation method thereof, which is prepared by blending and extruding polypropylene, peroxide masterbatches, and nucleating agent masterbatches in a twin-screw extruder for melt granulation High-melting index, high-performance polypropylene resin, but this method needs to go through twin-screw granulation three times in order to obtain the final product material, which requires high energy consumption, time-consuming and laborious
Chinese patent CN1314745C discloses a high-flowability polypropylene manufacturing method, adding powdered polypropylene and a peroxide chemical degradation agent into a stirred reactor to prepare a polypropylene with a melt index of 40-3000g/10min through solid-phase degradation reaction. Polypropylene, but the product obtained by this method has poor controllability of melt index, wide molecular weight distribution, and more residual chemical degradation agents
At present, most of the transparent nucleating agents used in the prior art are sorbitol or organic phosphates or abietic acid salts, etc., but they are generally used alone, and it is difficult to combin

Method used

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  • Low-odor high-transparency ultrahigh flowability polypropylene as well as preparation device and method thereof
  • Low-odor high-transparency ultrahigh flowability polypropylene as well as preparation device and method thereof
  • Low-odor high-transparency ultrahigh flowability polypropylene as well as preparation device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] S1, the polypropylene powder (grade 225 powder) of 49.85kg, the lubricant EBS of 50g, the antioxidant 1010 of 50g, the antioxidant 168 of 50g are mixed in high-speed mixer 1, weigh 4 from 2# weight loss Put into the middle hopper 5; 50kg polypropylene pellets (brand Z30S) are put into the middle hopper 5 through 1# loss in weight scale 3; Setting extruder rotating speed is 350 rev / mins, and the total cutting speed of weight loss scale is 450kg / h, set Set the feeding ratio of 1# loss-in-weight scale and 2# loss-in-weight scale to 50% / 50%, and the material is fed to the extruder through the middle hopper 5;

[0080] S2, di-tert-butyl peroxide for free radical initiator in initiator tank 7, setting precision metering pump 6 flow rate is 30ml / min, pressure is that 3.50MPa injects twin-screw extruder 10, polypropylene is in organic peroxidation Under the action of species initiator, high temperature melting and screw shearing, free radical degradation reaction occurs, the mo...

Embodiment 2

[0087] S1, the polypropylene powder (brand name PP-H-225) of 49.85kg, the lubricant calcium stearate of 50g, the antioxidant 168 of 50g antioxidant 1076,50g are mixed in high-speed mixer, from Put 2# loss-in-weight scale into the middle hopper; put 50kg of polypropylene pellets (brand Z30S) into the middle hopper through 1# loss-in-weight scale; set the speed of extruder to 350 rpm, and the total feeding speed of loss-in-weight scale is 450kg / h, Set the feeding ratio of 1# loss-in-weight scale and 2# loss-in-weight scale to 50% / 50%, and feed the material to the extruder through the middle hopper;

[0088] S2, 2,5-dimethyl-2,5-bis(tert-butyl peroxide) hexane is used as a free radical initiator, and the flow rate of the precision metering pump is set to 24ml / min and the pressure is 3.00MPa to inject into the twin-screw extruder After exiting the machine, under the action of organic peroxide initiator, high temperature melting and screw shearing, the polypropylene undergoes free ...

Embodiment 3

[0095] The difference between this embodiment and Example 1 is: first, the grade of polypropylene powder is PP-H-045, and the lubricant is calcium stearate; second, the grade of polypropylene pellets is Y24; Its three, what free radical initiator adopted is two (tert-butyl peroxide diisopropyl) benzene; Its four, the flow rate of setting precision metering pump is 42ml / min, and pressure is 4.00Mpa; Its five, sink connection The set temperature of the chiller is 15°C.

[0096] In this embodiment, the product is extruded by an extruder, drawn, cooled, pelletized and dried. The physical properties of the product are shown in Table 1.

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Abstract

The invention discloses low-odor high-transparency ultrahigh flowability polypropylene which comprises the following components in percentage by mass: 96-99.89% of a polypropylene resin, 0.1-2% of a free radical form initiator, 0-0.2% of a lubricant, 0.01-0.3% of an antioxidant and 0-1.5% of a compounded transparent nucleating agent. Due to adoption of the compounded transparent nucleating agent which is sufficiently reacted with the polypropylene resin, the initiator, the lubricant and the antioxidant synergistically, the ultrahigh flowability polypropylene which is high in transparency, lowin yellow index and low in haze is prepared. In addition, the invention further discloses a completely novel preparation device and process of the low-odor high-transparency ultrahigh flowability polypropylene. The transparency, the low odor and the low volatilization of the product in the preparation process can be further improved on the basis of a completely novel formula, the product can be prepared by using a one-step method, large-scale popularization and production in factories can be implemented, meanwhile, the problem of small molecule residues in the product is also solved to a largeextent, and aftertreatment processes of non-woven fabric manufacturing companies can be simplified.

Description

technical field [0001] The invention belongs to the technical field of modified plastics, and relates to a low-odor, high-transparency, super-fluidity polypropylene and a preparation device and method thereof. Background technique [0002] Ultra-high fluidity polypropylene generally refers to a polypropylene material with a very high melt index (MI≥500g / 10min), which is often used as the main material for non-woven fabrics in the melt-blown process. At present, there are generally three processes for preparing ultra-high fluidity polypropylene. One is the hydrogen control process in the polymerization process (that is, the hydrogen adjustment method). The polypropylene melt index prepared by this process has a limited range of adjustment, and it is difficult to adjust to a high level, and the molecular weight distribution is usually wide, which is not conducive to melt-blowing. The production and product performance of textiles; one is the synthesis of ultra-high fluidity p...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08K5/00B29B9/06
CPCC08K5/00B29B9/065C08L2201/10C08L23/10
Inventor 邵有国王红陈奇王恩礼李延超
Owner 大韩道恩高分子材料(上海)有限公司
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