Acrylic resin production involves free radical polymerization mechanism, formulation and process design, control of raw materials for synthesis (acrylic monomers, solvents, initiators, auxiliaries, etc.), production equipment and process conditions, measurement and instruments, production operations, central control, quality inspection, packaging and other links.
The principle of chemical synthesis reaction of acrylic resin is the free radical polymerization of monomers, including the initiation of acrylic acid chain, the growth of chain, and the termination of chain. The reaction mechanism is relatively complex.
It is worth emphasizing that the acrylic resin reaction is an exothermic reaction (a little heating is required in the initial and later stages of the reaction, and the polymer synthesis can basically be maintained if the reaction itself is exothermic in the middle of the reaction), and the alkyd resin reaction is an endothermic reaction (it needs to continue The dehydration reaction can only be carried out by heating and heating).
If you can objectively and correctly recognize the many influencing factors in the production of acrylic resin in advance, and deal with the existing problems and hidden dangers in a timely and correct manner, you can effectively avoid errors or losses in production, and ensure product qualification and continuous and stable production.
For example, there are some abnormal phenomena in production, such as high or low solid content or viscosity of acrylic resin, high odor, low monomer conversion rate, etc. Acrylic acid manufacturers can take effective measures to make adjustments, so that unqualified products can be changed. To qualify, this type of phenomenon is reversible.
Another example is that the color of acrylic resin is relatively dark, such as yellowish or reddish, the appearance of resin products is white, milky, and muddy, and the resin has poor fluidity, gel, and colloidal particles.
Such a situation is an irreversible anomaly that is difficult to deal with, or even impossible to salvage. Try to avoid and eliminate the occurrence of this problem. For the emergence of this kind of finished acrylic acid, pay special attention not to flow into downstream customers, otherwise the consequences will become more serious.
1. Introduction to the main raw materials of acrylic resin
Acrylic resin raw materials, especially monomers, must be carefully tested batch by batch before entering the factory.
If there are some problems with the raw materials and they are eager to produce, the acrylic acid supplier must do pre-production tests carefully to ensure that the production is qualified. The raw materials are the most critical link and must be grasped.
2. Solvent for acrylic resin
Commonly used solvents for acrylic resin synthesis are toluene, xylene, butyl acetate, trimethylbenzene, CAC, PMA, BCS, butanol and other solvents.
Petroleum solvent isomerization product grade, with less purity and odor, and lower content of moisture and other components. In particular, the narrower the process range of solvents such as toluene and xylene commonly used as reflux solvents, the better.
The solvent is the carrier of the acrylic resin solution polymerization reaction. The color of the solvent is yellow or the content is unqualified, and it is difficult to ensure the production of qualified resin. Therefore, it is very important to ensure that the solvent is qualified.
If the water content of the solvent is too large, after the solvent is put into the solvent, before the mixed monomer is added dropwise to the reaction, it should be ensured that there is enough time to dehydrate the solvent under reflux and stirring until the water is completely dehydrated.
After all the solvent is added in the later stage of the reaction, the process requires reflux for 30 minutes, and this process cannot be ignored to ensure that all the water in the system is taken out through the reflux.
The second is to ensure that there are very few residual butyl acrylic monomer/initiators in the system, so as to avoid problems such as strong odor of acrylic resin and poor paint durability.
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