Blog
Formulations, application guidance and product chemistry, written for the people who use these materials in production.
Plastic UV stabilizers fall into two main classes, UV absorbers and hindered amine light stabilizers, and each protects the product in a different way. Selection starts with the product's thickness, transparency, processing temperature and service environment, and then moves on to the stabilizer system and the specific grades.
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Defoamers are additives that break down and suppress foam, eliminating the bubbles that coatings pick up during production, filling and application and preventing pinholes, craters and loss of gloss. They must stay suitably incompatible with the system, and the type, the addition stage and the dosage all have to be determined by testing.
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Plastic antioxidants are additives blended into polymers to interrupt the chain reaction of thermo-oxidative aging. They protect the melt from degrading during processing and slow down embrittlement, yellowing and cracking during storage and use. They are used in very small amounts, yet they decide how long a plastic product lasts.
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Leveling agents are additives that adjust the surface tension of the wet film, letting coatings and inks flow out smooth before they dry, eliminating orange peel, brush marks, craters and floating, and raising gloss. They are used in very small amounts, and choosing the right type and dosage directly decides film appearance and recoat performance.
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Lightfastness is a pigment's ability to hold its color under light; weather resistance is its ability to hold color and performance under light, heat, moisture and oxygen acting together. The color life of any outdoor product is decided by these two properties, and neither of them can be seen on a laboratory draw-down.
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Poor pigment dispersion shows up directly as low tinting strength, batch-to-batch color variation, flooding and floating, specks and seeds, loss of gloss and coarsening or settling in storage. The root of these problems lies not in the color itself but in whether the pigment particles were properly wetted, deagglomerated and stabilized.
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Organic pigments bring high tinting strength and vivid shade, while inorganic pigments bring hiding power and solid heat and weathering resistance; the starting point for selection is always the service environment of the part and the service life expected from it, with price as only one variable among several.
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Titanium dioxide is the white pigment with the highest refractive index and the strongest hiding power, and in a formulation it delivers opacity, whiteness and weathering performance at the same time; the wrong crystal form chalks within the first outdoor year, and pushing the loading past its critical point drives cost up and performance down together.
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When one dye lot comes out a different shade from batch to batch, the cause is usually not the dye itself but the process variables that shift on every run: the temperature curve, the water, and the liquor ratio.
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Digital printing dye has to reach submicron dispersion, with far tighter filtration and viscosity control than traditional printing dye; reaching for a conventional grade in a pinch is what permanently blocks a print head.
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Disperse and reactive dyes color completely different fibers, and choosing the wrong type leads to uneven shade or fast fading, especially on polyester-cotton blend fabrics.
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Dyeing auxiliaries carry no color of their own, but they determine whether a dye attaches to the fiber evenly and stably; leveling agents, fixing agents and dispersing agents each solve a different stage of the process, and none of them is optional.
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