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A special polypropylene resin for non-woven fabrics and its synthesis method

A technology of polypropylene resin and synthesis method, which is applied in the field of synthesis of polypropylene resin for low-odor non-woven fabrics, which can solve the problems of obvious odor, unusable, broken wires, etc., and achieve the effect of improving degradation rate and flow rate

Active Publication Date: 2020-06-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polypropylene resin for non-woven fabrics adopts high-fluidity polypropylene with a melt index of 30g / 10min or more. The current industrial production methods are mainly hydrogenation method and degradation method, but the two methods have their own advantages and disadvantages. The resin produced by hydrogenation method has an odor Small, but the melt index fluctuates greatly and the molecular weight distribution is wide. During the non-woven fabric processing, it is easy to produce broken filaments, hard filaments, etc., which will affect the stable production; the products produced by the complete degradation method have narrow molecular weight distribution and stable melt index. High, the product has strong spinnability, uniform web formation, and soft hand feeling, but due to the production process control method and the selection of peroxide types, the residual amount of peroxide in the product is high, the product smell is obvious, and non-woven products cannot be used. It is used in fields with high odor requirements such as medical treatment and sanitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Adopt Innovene gas-phase polypropylene device, reactor pressure 2.2MPa, reaction temperature 60-70 ℃, reactor material level is 70%, hydrogen and propylene molar ratio (H 2 / C 3 ＝ Ratio) 0.9, react; Then the peroxide 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane (Trigonox101) of the above-mentioned product and the total weight of the above-mentioned product of 0.044% is added to extrude In the granulator, the temperature of the seven-stage extrusion granulation system is 60-65°C; 140-145°C; 160-165°C; 205-210°C; 210-215°C; 205-210°C; The residence time in the extrusion granulator is 40s, and the granulation water flow rate is 500m 3 / h, the homogenization time is 8h, the molecular weight distribution width of the product is 2.8, the melt index is 38.9g / 10min, and the product odor level is 2.

Embodiment 2

[0050]Adopt Innovene gas-phase polypropylene device, reactor pressure 2.2MPa, reaction temperature 60-70°C, reactor material level 70%, H 2 / C 3 ＝ The ratio is 1.0, and the reaction is carried out, and then the above product and the peroxide Trigonox101 with a total weight of 0.039% of the above product are added to the extrusion granulator, and the temperature of the seven-stage extrusion granulation system is 60-65 ° C; 115-120 ° C; 130-135°C; 200-205°C; 210-215°C; 195-210°C; 200-205°C, the residence time in the extrusion granulator is 36s, and the pelletizing water flow rate is 600m 3 / h, the homogenization time is 7h, the molecular weight distribution width of the product is 2.9, the melt index is 40.5g / 10min, and the product odor level is 1.5.

Embodiment 3

[0052] Adopt Innovene gas-phase polypropylene device, reactor pressure 2.2MPa, reaction temperature 60-70°C, reactor material level 70%, H 2 / C 3 ＝ Ratio 1.2, then the peroxide 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane (Trigonox101) of the above-mentioned product and the total weight of the above-mentioned product of 0.034% is added in the extrusion granulator , The temperature of the seven-stage extrusion granulation system is 70-80°C; 155-160°C; 165-173°C; 212-217°C; 210-214°C; 195-201; The residence time in the extrusion granulator is 40s, and the granulation water flow rate is 650m 3 / h, the homogenization time is 8h, the molecular weight distribution width of the product is 3.1, the melt index is 39.8g / 10min, and the product odor level is 0.8.

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Abstract

The invention provides polypropylene resin special for non-woven fabrics and a synthetic method of the polypropylene resin. The method comprises the following steps that 1, hydrogen and propylene are added into a polymerization reactor according to the mole ratio of 0.9-1.3, a catalyst composition is added, the reaction temperature is controlled to range from 55 DEG C to 80 DEG C, the reaction pressure is controlled to range from 2.1 MPa to 2.5 MPa, the reactor material level is controlled to range from 60% to 75%, and reacting is conducted; 2, a reaction product obtained in the first step and peroxide are added into an extruding granulator and stay for 30 s to 40 s, and strip-shaped materials are extruded through an extruding granulation system, wherein the extrusion temperature ranges from 55 DEG C to 220 DEG C; 3, the strip-shaped materials are cooled with cooling water and cut into particles, the particles are homogenized, and the polypropylene resin is obtained, wherein the flow capacity of the cooling water ranges from 500 m<3> / h to 700 m<3> / h. According to the polypropylene resin, the odor level is 0-2, the requirements of the non-woven fabrics used in the fields of hygienic materials, foods and medical health are met, the melt flow rate ranges from 38 g / 10 min to 43 g / 10 min, and the requirements of spinning stability in the non-woven fabric processing process are met.

Description

technical field [0001] The invention relates to a method for synthesizing polypropylene resin special for low-odor non-woven fabrics, belonging to the field of synthetic resins. Background technique [0002] Non-woven products produced from fiber-grade polypropylene are mostly used in medical and health products, such as surgical drapes, surgical drapes, surgical gowns, surgical caps, protective clothing and personal hygiene products, etc. Non-woven fabrics used for sanitary materials are required to be non-toxic , Odorless, and efficient bacteria isolation, so the requirements for the smell of raw materials are higher. [0003] Polypropylene resin for non-woven fabrics adopts high-fluidity polypropylene with a melt index of 30g / 10min or more. The current industrial production methods are mainly hydrogenation method and degradation method, but the two methods have their own advantages and disadvantages. The resin produced by hydrogenation method has an odor Small, but the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06B29B9/06
Inventor 张璐徐文清杨丽芳张治军吴利平朱军胡斌周豪秦军刘朝军冯凯席军
Owner PETROCHINA CO LTD