Application of new epoxy resins in powder coatings

1 Introduction

There are mainly two series of solid epoxy resins, namely: one-step solid epoxy resin E-12 (604) series products and two-step solid epoxy resin T series products.

2.
One-step solid epoxy resin E-12 (604) series products

The main process route is polycondensation of bisphenol A and epichlorohydrin under the action of NaOH to prepare a solid epoxy resin with a medium molecular weight.
The ring-opening reaction and the ring-closing reaction in the reaction process are carried out under the same conditions.
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By adjusting the dosage ratio of bisphenol A and epichlorohydrin, the reaction temperature and the effective control of the reaction time, solid epoxy resin com" href="http://">coatings with different average relative molecular masses can be prepared com" href="http://">online coatingol.
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The reacted product is washed, dehydrated, decompressed, cooled and packaged into finished products.
This series of products is divided into two categories, namely: comprehensive solid epoxy resin and functional solid epoxy resin.

The purpose of the development of functional solid epoxy resin varieties: First of all, to respond to market demand, because the current solid epoxy resin market for powder coatings is chaotic, and product quality and customer needs are also uneven.
Our single 604 epoxy resin has been Unable to adapt to market demand;

The third is to provide customers with more options.
Customers who need good mechanical properties can use our 604 and HY04T, and those with requirements for leveling and matting can use functional epoxy (also called 8 series epoxy);

In addition, functional epoxy also has comparative advantages in terms of price, which can greatly improve market competitiveness as a whole.

3.
Two-step solid epoxy resin T series products

The main process route is to heat and dissolve the liquid epoxy resin with low molecular weight and bisphenol A, and then undergo an addition reaction under the action of a catalyst to prepare a solid epoxy resin with high molecular weight.
The product after the reaction is directly cooled and packaged into a finished product.

The purpose of developing two-step solid epoxy resin T series varieties: First, the T-type solid epoxy resin adopts a two-step production process.
It is an environmentally friendly product that does not require water and is pollution-free.

The comprehensive solid epoxy resin variety is a comprehensive balance.
Its performance in all aspects is relatively medium and has a wide range of applications.
In the process of making powder coatings, neither particularly good powder coatings nor special ones can be made.
Bad powder coating.

4.
1 Application characteristics of functional solid epoxy resin varieties:

(1) Compared with the comprehensive solid epoxy resin varieties, the functional solid epoxy resin varieties have better leveling, especially the 68 series chemical matting agent is used as a matte powder.

According to the order of grades HY604-810, HY604-820, HY604-850, HY604-870, the larger the grade, the better the leveling, and the proportion of matting agent can be appropriately reduced, which can save costs, and the price is more advantageous.
Can further enhance customer market competitiveness.

(2) As the grade becomes larger, its mechanical properties become worse and the glass transition temperature becomes lower, so it is more likely to agglomerate in summer.
However, with the exception of HY604-870, no feedback information about the occurrence of agglomeration has been received.

(3) The scope of application of functional solid epoxy resin varieties: for high-gloss and flat-gloss powders, good leveling is required; for matt and matte powders, low gloss is required, and the impact requirements can meet the different needs of customers.
manufacturer.

4.
2 Application characteristics of two-step solid epoxy resin T series varieties:

(1) The color of the product is white, the appearance is transparent, and it can be made into transparent powder, and the made powder has high impact strength, good bending strength and adhesion, especially when it is made of fine art powder coatings.
, Hammer powder, etc.
).

(2) The molecular weight is relatively concentrated, and the reaction rate when curing into a film is relatively concentrated, so that the curing time of most materials is concentrated in one period, so that it is easy to obtain a stable texture;