A kind of linear dialdehyde modified polyvinyl alcohol and its preparation method and application

A technology of polyvinyl alcohol and dialdehyde, which is applied in the field of straight-chain dialdehyde modified polyvinyl alcohol and its preparation, can solve the problems of excessive molecular weight distribution, poor product quality, and poor foam suppression performance, and achieve the goal of inhibiting Foaming during vinyl chloride polymerization, suppressing foaming, and excellent performance
CN109651541BActive Publication Date: 2021-07-02CHINA PETROCHEMICAL CORP +2
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROCHEMICAL CORP
Publication Date
2021-07-02

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a linear divalent aldehyde modified polyvinyl alcohol. The linear divalent aldehyde is used to modify the polyvinyl alcohol. As the main dispersant for vinyl chloride suspension polymerization, it has good dispersion effect, can effectively inhibit foaming during vinyl chloride polymerization, and has both good adhesive retention and dispersion properties; it can be prepared with a viscosity of 107-112ml / g. Table The apparent density is 0.45-0.50g / ml, the plasticizer absorption is more than 20%, the PVC product with excellent performance and uniform particle size distribution. The preparation method of the invention is simple, the process time is short, large-scale equipment is not required, and the invention is suitable for industrial production.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to modified polyvinyl alcohol, in particular to a straight-chain dialdehyde-modified polyvinyl alcohol and its preparation method and application. Background technique

[0002] Polyvinyl alcohol (PVA), as the most commonly used dispersant for vinyl chloride suspension polymerization, plays a vital role in the performance index of vinyl chloride suspension polymerization and polyvinyl chloride products. However, with the application of large-scale polymerization reactors equipped with condensers in the vinyl chloride industry, the pressure near the reflux condenser drops due to the condensation of vinyl chloride monomer vapor, resulting in wet foam caused by dispersants and composed of PVC particles dry foam, resulting in a reduction in the effective volume in the polymerization vessel, a decrease in production efficiency, and fouling. Therefore, it is necessary to develop new polyvinyl alcohol as a dispersant.

[0003] In the de...

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