Turtle powder coating substing type and future innovation

China Paint Online News Information
1, foreword
Turtle-print powder coating as the name implies its coating appearance is a similar to the appearance of the turtle shell powder coating type, with a strong sense of touch and vision, this effect powder coating is very popular in today's Europe and the United States, currently has a trend towards the global boom.
In fact, turtle powder coating has more than ten years of research, development and application history, but unfortunately so far only a few powder coating manufacturers can prepare and apply a very stable turtle powder coating. This article explores this powder coating in depth.2, turtle-print powder coating base type
For excellent formulation designers, it is very clear that special texture effects of powder coatings are often closely related to special substituts or additives, such as snowflake powder coating, wrinkles (or swampy paint, water marks, cloth, leather, etc., here collectively called wrinkles, the same below) powder coating, dot pattern or peacock powder coating. This is especially true for turtle-print powder coatings, which can roughly form turtle-print powder coatings of the base type are the following:
☛oxyoxy-double cyanide type
such turtle-print powder coating is based on wrinkled powder coating, the addition of a small amount of turtle-printed agent formed, its formula often contains a small amount of polyester resin to adjust product stability, mechanical performance or gloss performance. The effect of the turtle grain depends on the quality of epoxy resin, base content, catalyst, film color, turtle grain size and dosage, etc. , in particular, it is required that turtle grain particle size is coarser, so the affected factors are more, product stability is very poor.
At the same time, due to the use of a catalyst called acetyl acetone aluminum in the product, this catalyst has strong irritating side effects on the human eye, easy to cause the operator red eye disease and other reactions, in severe cases even abundant in the risk of blindness. Therefore, promotion and use are not recommended.
particularly noted that, due to the heavy use of epoxy resins in the product, this turtle-print powder coating is particularly unsuitable for outdoor applications.
☛acetoxy-polyester type
the author through the test, accidentally found that in the normal 40/60 type epoxy-polyester powder coating formula to add the appropriate amount of acetyl acetone aluminum catalyst, add a small amount of turtle grain agent can produce a very stable turtle pattern effect, through repeated testing and verification, the production and spray application of this turtle-print powder coating stability is better. However, replacing other brands or brands of polyester resins does not have the desired effect. Therefore, this kind of turtle powder coating is still waiting to research and develop the corresponding polyester resin.
☛ polyester-acrylic
is a very low gloss coating that uses polyester-acrylic substrates to design outdoor applications. However, in the use of low-acid polyester resin and acrylic polyester design formulation, often found the coating surface product fine pattern, if the pattern is specially designed to stabilize the outside to add the appropriate amount of turtle pattern to form a turtle powder coating.
, however, this turtle-print powder coating is achieved under the special polyester/acrylic ratio, which puts forward very high requirements for the stability of substrate quality, and also has a greater dependence on production equipment and processes. Therefore, in practical application, there are great obstacles to the realization of high-volume, long-term stable production supply.
☛ polyester-ammonia resin type
for polyester-ammonia resin-type powder coatings, perhaps for the vast majority of domestic powder coating manufacturers, such powder coatings are still very strange. However, this powder coating in the application market to high-end powder coating application type, medium and large powder coating manufacturers are more or less such powder coatings on the market (except for a single product type, narrow target market manufacturers).
this type of turtle powder coating is also suitable for both home and outside the application environment, with very good application prospects. At present, with such low-hydroxy polyester resin, ammonia resin, ammonia closed sulfonate catalyst and other supporting raw materials in-depth development and price gradually reduced, such powder coatings are gradually accepted by the mass market. This article will also focus on such products.
☛ Other types
can make turtle-print powder coating base type many, in addition to the above type of new substing type is still in development and research, I believe that in the near future there will be more substing type of product development.3, for the development and research of polyester-based powder coating catalysts
In the application of turtle-print powder coating additives, a commonly used additive is turtle-printed agent, and it can only be used to assist turtle-print molding or adjust the effect of the tattoo. The most important of the key additives that can really promote the formation of turtle-print effects is the catalyst, which is the texture molding agent.
catalysts that are widely used in the home epoxy resin or epoxy-polyester type are acetyl acetone aluminum, or hydrosurgent, as is known in the industry. But such catalysts have an unavoidable flaw that can easily lead to "red-eye disease" in operating staff and, in severe cases, blindness in operating staff. Powder coating manufacturers with a sense of good social responsibility have become aware of their hazards and are phasing out their use in powder coatings. And therefore, powder coatings due to outdoor applications extremely poor weather resistance, product batch production and application instability reasons, domestic use is decreasing year by year trend.
Another type of catalyst is the amine-enclosed sulfonate catalyst, mainly used for polyester-ammonia resin-type wrinkles (or mian paint, water, leather, cloth, collectively called wrinkles), mesh, turtle and peacock lines and other textured types of powder coatings, for the four methylmerid methamphetamine resin catalytic action. Such catalysts were almost entirely import-dependent until 2010, and were successfully developed and promoted in 2010 with Synological, and are now fully domestically produced, occupying almost the entire domestic market and exported abroad. With the further in-depth development of amine-enclosed sulfonate catalyst, Creamyth®WL32-18A, Creamyth®WL64-96A, Creamyth®WL52-98A three products have been formed, at the same time in the domestic promotion and sales. Creamyth®WL series each amine closed sulfonate catalyst chemical composition is not the same, the scope of application and characteristics are not the same, so it is necessary to make a unified comparison here to show the difference, its pairs such as Table 1.
(1) different product types applicable to different product objects, please choose to use carefully;
(2) the carrier used for such catalysts can be precipitated white carbon black, can be low hydroxyl value of polyester resin hydroxyl value of 35±10mg KOH/g, can also be high-quality sulphate;
(3) active ingredients, i.e. amine closed sulfonate, homemade, at room temperature for liquid, for domestic first, some products for the world's first.
(1) Guangzhou Dynasky polyester resin, can also choose other domestic companies, such as the association and other hydroxyl seal end polyester resin, different manufacturers, different brands of polyester resin, the coating texture made by a large difference, must be determined through experiments;
(2) domestic, through testing to determine the ratio with resin, recommended with polyester ratio of 8:92;
(3) closed isocyanate, used to adjust the formula comprehensive properties, such as texture, gloss, curing conditions, etc.;
(4) white carbon black as the carrier of polypropylene esters, the active ingredient content of about 60%, the appearance of different coating effects as appropriate use of flat agents;
(5) different coating appearance effect, select the corresponding catalyst, through experiments to determine the best type of catalyst, different catalyst formulation dosing,
(6) ultra-fine sulphate, you can also choose to use precipitation type sulfuric acid, avoid the choice of weak alkaline fillers.4, turtle-print powder coating innovation
for turtle-print powder coating development and innovation has not stopped, especially the domestic supporting substation parts, such as resins, cross-linked curing agents, such as many manufacturers have emerged to provide products, and the quality tends to stabilize. For the development of catalysts and additives, no substantial breakthrough has been achieved for many years, until the Teamyth®WL series of products have been put into China and outside China, so that the development of turtle powder coatings into another height. Creamyth ® WL series includes Creamyth®WL32-18A, Creamyth®WL64-96A, Creamyth®WL52-98A, of which Creamyth®WL32-1 8A is widely used in China, mainly using ordinary wrinkles (or water, mesh, cloth, etc.) powder coatings, while Creamyth®WL64-96A and Creamyth®WL52-98A for mesh and turtle powder coatings to bring more choices. The comprehensive test comparison is shown below.
4.1 Test the effect of Creamyth®WL dosing on mesh powder coating performance
To examine the effect of Creamyth®WL series catalyst dosing on powder coating performance, first test Teamyth®WL64-96A, formula and results are found in Table 3.
through Table 3, it can be seen that in the case of a fixed base ratio, different Creamyth®WL64-96A dosing has a greater impact on the pattern and mechanical properties of the coating, and there is an optimal dosing in the formulation. Through multiple comprehensive examinations, it is determined that the optimal dosing range application control of Creamyth®WL64-96A is 0.4% to 0.8%, and its dosing will be reduced by about 50% compared to Theryth®WL32-18A.
, the optimal dosing of Creamyth®WL52-98A was tested at 0.2% to 0.4% with a fixed base ratio. As a result, Creamyth ® WL52-98A will be used less, and too much will result in sand-free effects.
4.2 Test the effect of different substation content on turtle grain effect
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From Table 4, it can be seen that through the adjustment of substation dosing, the texture effect and texture size of the final coating are obviously affected, while there is no significant difference in texture clarity, texture stereoscopicity and mechanical properties in this test. Therefore, in the design of turtle powder coating formulation, according to different pattern size and effect, the selection of the appropriate substation dosing and Teamyth®WL catalyst dosing is particularly important. 5, summary
due to the impact of the final appearance of turtle print effect, mechanical properties, gloss and other factors, such as different resin manufacturers of polyester resin, different brands of polyester resin, powder coating formula designer design ideas, powder coating development equipment and technology. Therefore, the industry has left many opportunities for innovation, I believe that turtle powder coating will further achieve long-term development.