Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of propene polymer composition

A technology of propylene polymer and composition, which is applied in the field of preparation of propylene polymer composition, can solve problems such as low isotacticity, food contamination, and limited application range, so as to reduce possibility, facilitate processing, and smooth production Effect

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]It is generally believed that the lower the isotacticity of the propylene polymer composition used to produce BOPP films, the lower the melting temperature and the wider the molecular weight distribution, the more conducive to high-speed drawing of BOPP films Therefore, the isotacticity of propylene homopolymers used as BOPP special materials on the market is very low, but most of their xylene solubles are more than 3.5%, which reduces the melting point of the polymer, but the solubles The high content limits its scope of application. If it is used in the food industry, it will contaminate food. Of course, there is also a method to add propylene copolymer to propylene homopolymer. The best way is that the molecular weight of the copolymer should be Higher than the molecular weight of homopolymer, as Chinese patent CN1810871A discloses a kind of production method and characteristics of propylene polymer composition of BOPP film with ring pipe process, the xylene soluble matter of polymer is lower, and the propylene polymer composition of BOPP film Stiffness is good, but the melting point of the polymer is not low enough, or the melt distribution needs to be more optimized. In addition, due to the problem of the catalyst system, the width of the molecular weight distribution of the produced polymer needs to be further improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of propene polymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: In the reactor fully replaced by high-purity nitrogen, 60kg of magnesium chloride, 112L of toluene, 50L of epichlorohydrin, and 157L of tributyl phosphate (TBP) were added in sequence. The temperature was raised to 50°C with stirring and maintained for 2.5 hours, and the solid was completely dissolved. Add 17.5 kg of phthalic anhydride and continue to maintain for 1 hour. Cool the solution to below -25°C and add TiCl dropwise within 1 hour 4 700L. The temperature was raised slowly to 80°C, and solids were gradually precipitated during the heating process. Add 75mol of 2,4-pentanediol dibenzoate to 80°C, and maintain the temperature for 1 hour. After filtration, 700 l of toluene was added and washed twice to obtain a solid precipitate. Then add toluene 750L, TiCl 4 500L, heated up to 100°C, treated for two hours, drained the filtrate, then added 750L of toluene, TiCl 4 500L, heated up to 100°C, treated for two hours, and drained the filtrate. Then add...

Embodiment 2

[0023] Example 2: Replace 2,4-pentanediol dibenzoate with 3,5-heptanediol dibenzoate, and add 75mol of 3,5-heptanediol dibenzoate at 80°C, other conditions are the same as the implementation example 1.

Embodiment 3

[0026] Example 3 : A continuous test was carried out on a Mitsui Hypol process unit containing two liquid phase tanks and two gas phase tanks, each with a volume of 32m 3 , 32 m 3 , 105m 3 and 165 m 3 . First, the catalyst prepared in Example 1 was prepolymerized with propylene in a hexane solution at a temperature lower than 15°C and the molar ratio of triethylaluminum to titanium in the main catalyst was 3 to obtain a prepolymer with a prepolymerization ratio of 3. , and then it is continuously added to the reaction device, and according to the activity, the addition amount of the catalyst is adjusted to keep the production load of the device at 10 tons of polymer / hour. The molar ratio of main catalyst (based on titanium content), co-catalyst component triethylaluminum and methylcyclohexyldimethoxysilane is 1 / 50 / 8, only ethylene is added to the fourth reactor, ethylene The addition amount is 48kg / h, and the reaction temperatures of the four tanks are 70°C, 65°C, 75°C, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a propene polymer composition. The method is characterized in that in the presence of catalyst components and hydrogen, firstly the propene homopolymer is produced in three or more than three reactors, then the propene polymer is produced in a final reactor, the multiple reactors comprise liquid reactors and gas reactors, the reaction temperature of the liquid reactor is 60-85 DEG C, the pressure of the liquid reactor is 2-5 MPa, the reaction temperature of the gas reactor is 70-90 DEG C, the pressure of the gas reactor is 1-3 MPa, the number-average molecular weight of the polymer is not less than the average molecular weight of the homopolymer, the ratio of the melt index of the final polymer and the melt index of the homopolymer is 0.3 to 1.0, and the catalyst component adopts the catalyst disclosed in the patent CN1453298A. The propene polymer composition is fewer in xylene soluble matters, the melt temperature is low, the molecular weight is widely distributed, the modulus of the polymer is high, the processing is favored, and a BOPP (biaxially-oriented polypropylene) film of 12 micrometers can be stretched at a high speed (420m / min or more).

Description

technical field [0001] The present invention relates to a process for the preparation of propylene polymer compositions. [0002] Background technique [0003] It is generally believed that the lower the isotacticity of the propylene polymer composition used to produce BOPP films, the lower the melting temperature, and the wider the molecular weight distribution, the more conducive to high-speed stretching of BOPP films. Therefore, the propylene homopolymer used as a special material for BOPP on the market The isotacticity is very low, but most of its xylene solubles are more than 3.5%. Although this reduces the melting point of the polymer, the high content of solubles limits its application range, such as in the food industry. Can pollute food, of course, there is also a kind of method to add propylene copolymer in propylene homopolymer now, wherein the best way is wherein the molecular weight of copolymer will be higher than the molecular weight of homopolymer, as Chine...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F210/16C08F210/06C08F2/34C08F2/04C08F2/01C08L23/12C08L23/16
Inventor 詹德明贾中明许造明纪苏陈明华贲道祥高明智刘海涛
Owner CHINA PETROLEUM & CHEM CORP