Styrene Modified Alkyd Resin Chemical Mechanism And Process Optimization

HC plastic mesh News: 1, Introduction

Alkyd resin is a polyol, multiple acid and acid condensation made a dollar a linear resin, with the synthesis of mature technology, manufacturing process is simple and easy to get raw materials and the resin coating and good overall performance characteristics of coatings used in the synthesis of resin, the largest and most widely used dosage. According to statistics reported in 1997, the National Paint 135 total tons, of which about 350,000 tons alkyd paint, accounting for 52.9% of synthetic resin; United Kingdom, the United States and other developed countries accounted for 30% to 40%, the highest synthesis resin first. However, alkyd paint also has some shortcomings, such as the film is slow drying, low hardness, poor water resistance, which will lead to extended construction period, but also affect its application. To solve the above problems, an integrated domestic and international aspects of the modified alkyd resins reported in the literature, this article through several different methods of chemical modification of alkyd resins were compared to study the mechanism of styrene-modified alkyd resin, the same time, the foundation Synthesis of alkyd resins and alkyd resins both were optimized. The results will be fast-drying alkyd resin to provide theoretical guidance for industrial production and a strong reference.

2, styrene modified alkyd resin chemistry and mechanism of the Methods

Traditional unsaturated oil (fatty acid) modified alkyd resin molecules with hydroxyl, carboxyl, double bond, ester and other reactive groups, therefore, can be chemically synthesized by means of the introduction of other active groups, so that broad chemical modification of alkyd base Jinchu chemical modification can be divided into the following categories: such as Modifier From the carboxyl function, the role of modifier and the use of the double bond from the reaction of hydroxyl chemical modification. Especially the use of chemical modification of the double bond most important chemical modification reaction, in which the most typical modified styrene, copolymerization mainly two kinds of law and pre-polymer.

2.1, copolymerization Vinyl monomer modified alkyd resin often used copolymerization. In accordance with the law of styrene copolymerization time and join in different ways, can be divided into before and after styrene of styrene of two methods.

2.1.1, the former method of styrene

Method includes pre-styrene styrene method of vegetable oils, fatty acids of styrene-based method and the method of styrene monoglyceride of three. Several methods of the above process Styrene points are as follows.

(1) vegetable oil styrene method Process of the law points are: First, styrene monomer and oil in the presence of initiator the reaction of copolymer oil this homogeneous product, the product can be prepared directly instead of vegetable oil alkyd resin. Styrene-based vegetable oil, first glycerol (pentaerythritol or other polyols) alcohol solution generation fatty acid monoglyceride and then phthalic anhydride and other multi-acid esterification.

(2) fatty acid method of styrene

Process of the law points are: first styrene and the initiator dropping into the acid containing DCO reactor, the reaction of styrene for fatty acid, and then vacuum distillation to remove the remaining styrene, further reaction cauldron by adding glycerin and other polyols in the alcohol under inert gas protection solution, and finally into the composition the amount of acid anhydride and other multi-esterification.

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Delhi University admission process to endure modify

 

This year admission procedure of Delhi University(DU) was greatly belittled because of its not logical cut-offs, illegal admission rackets and certain other problems following which the school has determined to change the procedure for buy.

A high powered committee comprising of 16 principals from different colleges of the University has been set up to draft recommendations on the admission process for the coming year.

The panel met the other day and it is revealed that some associates have encouraged that the number of universities that a college scholar can utilize must be restrained. The concept behind this is to come out with more genuine cut-offs.

However, this is just a offer given by the some associates and the ultimate choice regarding its rendering will be made after two or three evenings, most probably by mid Jan next season.

This year, the entrance procedure of the University was improved by scrapping away the typical entrance types and universities returning out with cut-offs based on consider your experience and panel outcomes. But it was considered to be an incorrect switch since it led to many problems and problems with ever-high cut-offs and over-admissions.

Get details on BBA Colleges in Pune

Even Partnership Telecommunications Reverend Kapil Sibal had to get involved asking for a more logical insurance insurance plan in determining qualifications key elements.

Apart from that, a large bogus entrance racquet in one of the colleges of North Campus also came to lumination with learners trying to deal up with the higher cut-offs using cast means. The issue is still being researched the by the specialists.

 

A high powered committee comprising of 16 principals from different colleges of the University has been set up to draft recommendations on the admission process for the coming year.

The panel met the other day and it is revealed that some associates have encouraged that the number of universities that a college scholar can utilize must be restrained. The concept behind this is to come out with more genuine cut-offs.

However, this is just a offer given by the some associates and the ultimate choice regarding its rendering will be made after two or three evenings, most probably by mid Jan next season.

 

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