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What is the difference between UV cation curing and UV radical curing
Free radicals: Light generated free radicals, acrylic ester double bond addition polymerization; Afraid of oxygen, quick drying, large shrinkage, stop when the lights are turned off. Cation: Light induced superacid, epoxy/oxetane/vinyl ether ring opening polymerization; Not afraid of oxygen, with...Read more -
Understand the role of alumina in coatings
1. Core: Improve hardness, scratch resistance, and wear resistance Alpha phase white corundum micro powder is the preferred choice for industrial wear-resistant paint, flooring, and engineering machinery topcoat Mechanism: Hard particles are embedded in the resin network, and during friction, the...Read more -
How to use fillers to improve thermal insulation and reflection performance
First, distinguish three completely different cooling mechanisms. Many formulas combine reflective fillers, barrier fillers, and radiation emitting fillers together, commonly known as the “reflection+barrier+radiation three in one insulation” infrared technology The solar heat is main...Read more -
Why is the initial hardness of the paint film high and easy to scratch after being left for a period of time
1、 The most common reason 1. Incomplete cross-linking, later development of “stress relaxation+soft segment microphase separation” PCDL is a long soft segment polyol, and the curing of 2KPU is divided into two stages: 1) Surface dryness+initial rapid cross-linking: A dense cross-link...Read more -
What are the reasons for color paint biting and wrinkling
First, distinguish the phenomenon: biting the bottom: the solvent/component of the topcoat swells, dissolves, peels, bulges, and directly damages the adhesion of the bottom paint film; Wrinkle: The surface of the paint film first forms a film cover, and the internal solvent cannot escape, causing...Read more -
The difference between initial water resistance, mid-term water resistance, later water resistance, and water-resistant white in water-based industrial paint coatings
Initial/mid-term/late stage water resistance is evaluated based on the overall water resistance of the coating according to the length of immersion time; Water resistant whitening is a specialized phenomenon: the coating turns white, loses its luster, and becomes turbid after immersion in water, ...Read more -
Application of PCDL polycarbonate diol 2KPU coating
PCDL is a high-end 2KPU soft segment polyol with a main chain of carbonate bonds, which is different from ordinary adipic acid polyester, PCL polycaprolactone, and PPG polyether. Its core positioning is a high-performance topcoat/elastic coating system with long life, high hydrolysis resistance, ...Read more -
What are the differences between the five major rheological additives
Color paste can be divided into water-based paste, solvent based paste, and universal paste. It is preferred to match your coating system, and then consider: pigment type, solid content, color development, weather resistance/acid and alkali resistance, compatibility, viscosity, ionicity, and addi...Read more -
Adhesion problem between coatings in clear varnish color paint two-component system
First, clarify the structure: substrate → intermediate coating → color paint → clear coat, and the delamination position is divided into three categories: ① Middle coating ↔ Delamination between colors and paints ② Color paint ↔ Delamination between varnishes ③ Internal coating, intermediate co...Read more -
What is the reason for the indentation of the coil topcoat
The paint film undergoes creep under pressure and temperature, and the surface is replicated by the opposite back paint/rough surface, resulting in a sinking of gloss and the formation of marks; It can restore gloss indentation, permanent indentation, and is most easily produced in high gloss and...Read more -
How to improve water and chemical resistance with carbodiimide crosslinking agent
1、 Reaction principle (key: only reacts with carboxyl groups) The resin (acrylic lotion, PUD) is introduced with acrylic acid/DMPA monomer, with carboxyl – COOH; Carboxyl groups are neutralized by amines to form carboxylate ions, which are highly hydrophilic and are the main culprits of po...Read more -
Differences in Brightness and Weather Resistance between Organic and Inorganic Pigments
1、 Fundamental essential differences Inorganic pigments: metal oxides, salts (titanium dioxide, iron oxide red/yellow, chromium based, cobalt blue, ultramarine), crystalline inorganic substances, chemically stable bonds, insoluble in resins/solvents. Organic pigments: Aromatic conjugated macromo...Read more