A3120 HAA (Hydroxyalkyl amide)VS TGIC-G test report

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A100 HAA (Hydroxyalkyl amide) test report

AAB chemical industry CO.,LTD Laboratory

1.Introduction

There are two curing agents for outdoor pure polyester powder,TGIC (triglycidyl isocyanurate) and HAA (Hydroxyalkyl amide). Due to toxicity of gene mutagenesis, TGIC has been restricted to use or prohibit to use in many countries and regions.As a replacement for the TGIC,HAA will be faster development, and will become the main curing outdoor pure polyester powder agent.  

In addition to non-toxic, the activity of HAA is stronger than that of TGIC, and the curing temperature is 20 degrees lower than that of TGIC, as long as it is cured at 180 degrees and 15 minutes,so the activity of pure polyester resin which match with HAA can be not so strong.At present, there are many polyesters can match with HAA,the called primid curing polyester.The acid value of polyester is lower than TGIC curing polyester low, only 20 - 30.

In theory, the hydroxyl of HAA can react with hydroxyl of various acid value polyester resins,but different performance of the reaction.We tested the curing effect of HAA curing polyester, TGIC curing polyester, 6 to 4 polyester react with HAA.The test result is as following,hope can know more about HAA,and give reference to powder coating plant when choose material and make formulation.

2.Experiment

Experiments with Yantai Donghui 30A twin screw extruder.Extrusion temperature at 110-120 degrees, speed is 210 R / min, sample baking conditions is 180 degrees 15 minutes, there are two kinds of model 0.5mm cold rolled steel plate for testing adhesion and impact strength, 0.3mm tin plate is used to test the bending properties.

The test will be taken by following steps:

At first, test the curing effect of HAA with different polyester.

We tested 4 HAA curing polyesters, 7 TGIC, 4 6/4 polyesters. The manufacturers acid value are shown in table one.

Secondly,comparison test of three manufacturers’ HAA and observe the different effect of different manufacturer.

Thirdly,pinhole elimination.

The weathering resistance of HAA has been tested by many large companies at home and abroad, which is equal to TGIC. This experiment focuses on the weak points of HAA, that is, appearance leveling, yellowing and pinhole. This is also the concern for powder factories and technicians.

Table 1: Polyester manufacturer and model test

3. the results of the test are as follows:

(1) polyester adaptability: A100 can be cured by HAA special polyester, TGIC polyester, 6/4 polyester .

2: flow leveling: HAA polyester leveling is best, followed by TGIC polyester (also better). Part of 6/4 polyester and A3120 HAA curing are poorly leveled, and the surface is wrinkled orange peel, but the 6055 level of Zhongfa is very smooth, 327D of Youbang is also good. (it is noteworthy that, although HAA can be used as a curing agent for 6/4 polyester to reduce cost, it has a reflection that coating is easily powdered.)

Dosage: the amount of A3120 HAA is 5% of HAA special polyester, 6% of TGIC05 polyester, 7% of 6/4 polyester.

The pinhole: adding 1% degassing agent or defoaming agent, coating less than 100 microns, no pinhole, flat powder film thickness is generally 70 to 80 microns, so HAA powder pinhole can be solved, no problem. 

The contrast: TGIC-05, Nanhai T105,San deli 552 comparison test, the effect of three kinds of HAA curing agent, leveling of  PL528 somewhat better.

4. The specific test situation is as follows

4.1 A3120 HAA special polyester

The experiment tested 4 types of HAA special polyester. The formula and results are as follows:

Conclusion:The special-purpose polyester HAA of these four manufacturers react with A3120 HAA can achieve excellent leveling and good airborne performance. Zhongfa 9337 and Shenjian 5811 yellowing slightly.

4.2 A3120 HAA curing with TGI special-purpose polyester

7 models of TGIC polyester were tested, and the formula and results were as follows:

Conclusion: TGIC polyester can be cured with HAA curing agent, and better leveling and mechanical properties can be obtained. The surface flow is a little worse than the HAA polyester, but it is still better. Zhongfa 9335, 3383, 9000,Qingtian Sanli yellowing is better.

4.3 A3120 HAA curing with 6/4 Polyester

4 models of 6/4 polyester were tested, and the formula and results were as follows: