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Low-VOC-content polypropylene resin and preparation method thereof

A technology of polypropylene resin and polypropylene, which is applied in the field of preparation of low-VOC content polypropylene resin and low-VOC content polypropylene resin, can solve the problems of volatile organic residues, reduce total volatile organic content, etc., and achieve odor reduction, Low input cost, simple and reliable operation process

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses microwaves to treat polypropylene, which significantly reduces the content of total volatile organic compounds in polypropylene materials and solves the problem of residual volatile organic compounds in polypropylene resins

Method used

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  • Low-VOC-content polypropylene resin and preparation method thereof
  • Low-VOC-content polypropylene resin and preparation method thereof

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preparation example Construction

[0017] The present invention provides a kind of preparation method of polypropylene resin with low VOC content, and this preparation method comprises the following steps:

[0018] The polypropylene is pretreated by a microwave multi-stage dryer, and then the pretreated polypropylene is dried in a vacuum oven, and then the dried polypropylene and processing aids are blended and extruded to granulate;

[0019] Wherein, the step of pretreatment of the microwave multi-stage dryer includes: firstly carry out the first-order conventional heating at a temperature of 80-150° C. for 10-30 minutes; then carry out the second-order microwave heating for 1-10 minutes and microwave power The density is 10-50W / L, and the gas-solid ratio of the material is ≥3.

[0020] According to a specific embodiment of the present invention, the preparation method includes the following steps:

[0021] S1. Polypropylene is placed in a microwave multistage dryer for pretreatment;

[0022] S2. placing the...

Embodiment approach

[0025] According to a preferred embodiment of the present invention, the microwave multistage dryer is a microwave vacuum multistage dryer, the pretreatment is carried out under vacuum conditions, and the treatment under vacuum conditions can further reduce the VOC content in the polypropylene resin . In order to remove VOC better, the method of the present invention preferably keeps the vacuum degree of the equipment vacuum system above -0.05MPa, more preferably above -0.08MPa.

[0026] According to the present invention, preferably, the microwave power density is controlled to be 20-40 W / L.

[0027] According to the present invention, preferably, the amount of polypropylene material placed in the microwave multistage dryer is controlled so that the gas-solid ratio is 4-20.

[0028] Controlling the pretreatment conditions within the above preferred range can further improve the VOC removal effect.

[0029] In the processing of the polypropylene resin of the present inventio...

Embodiment 1～4

[0038] Polypropylene pellets (YPJ-630, Sinopec Yangzi Petrochemical Company) were placed in a microwave multi-stage dryer (HXG-T225, Qingdao Microway Microwave Innovation Technology Co., Ltd.), firstly subjected to a conventional heat treatment, and then Second-stage microwave heating treatment. The specific process parameters of each embodiment are shown in Table 1. Then the pretreated polypropylene pellets are vacuum-dried in a vacuum oven to obtain dry polypropylene pellets; then the dried polypropylene pellets, processing aids (1:1 antioxidant 1010 and antioxidant Oxygen agent 168) was put into a high-speed mixer, and stirred at a speed of 300 rpm for 3 minutes to fully mix the components; then, the above-mentioned mixed material was added from the main material inlet, and after a temperature range of 190 ° C to 220 ° C BUSS kneading unit (MKD-30, Switzerland BUSS company), under the condition of keeping vacuum degree-0.08MPa, extrusion granulation obtains low VOC polypro...

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Abstract

The invention belongs to the field of polypropylene resin, and relates to polypropylene resin with low VOC content and a preparation method thereof. The preparation method comprises the following steps: pretreating polypropylene through a microwave multi-stage dryer, then drying the pretreated polypropylene in a vacuum oven, blending the dried polypropylene and a processing aid, and carrying out extrusion granulation, wherein the pretreatment of the microwave multi-stage dryer comprises the following steps: firstly, carrying out first-stage conventional heating at the temperature of 80-150 DEG C for 10-30 minutes; and then second-order microwave heating is carried out for 1-10 min, the microwave power density is 10-50 W / L, and the gas-solid ratio of the material is larger than or equal to 3. The total volatile organic compounds (TVOC) and odor of the polypropylene resin can be remarkably reduced, the defects in the prior art are well overcome, the operation process is simple and reliable, the input cost is low, and the polypropylene resin is suitable for the fields of high-grade automotive upholstery, medical and food packaging materials and the like with high environmental protection requirements.

Description

technical field [0001] The invention belongs to the field of polypropylene resins, and in particular relates to a method for preparing polypropylene resin with low VOC content and the polypropylene resin with low VOC content prepared by the method. Background technique [0002] Polypropylene (PP) has been widely used in various fields because of its excellent comprehensive properties, wide range of sources, high quality and low price. However, the existing polypropylene materials and products have the problems of releasing volatile organic compounds (VOC) to pollute the environment and endanger people's health to varying degrees, which largely limits the use of polypropylene materials in high-end cars with high environmental protection requirements. Applications in fields such as decorative parts, medical and food packaging materials. Therefore, the research and development of environmentally friendly low-VOC polypropylene resin and materials can expand the application fiel...

Claims

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Application Information

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IPC IPC(8): C08J3/28C08L23/12C08K5/134C08K5/526
CPCC08J3/28C08K5/1345C08K5/526C08J2323/12C08L23/12
Inventor 康鹏蔡涛林龙郭明海石胜鹏高达利李杰初立秋金滟
Owner CHINA PETROLEUM & CHEM CORP