What is the general composition of the ink is?-Iota

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Service > What is the general composition of the ink is?

What is the general composition of the ink is?

The main component of the ink is polymerizable prepolymer, a photosensitive monomer, a photoinitiator, the auxiliary ingredients are coloring pigments, fillers, additives (leveling agent, a polymerization inhibitor) and the like.

1, the polymerization of the prepolymer

Polymerizable prepolymer is determined UV varnish coating properties important component is the basic component of the UV ink, a film-forming material, the properties of ink film properties after curing and the curing process plays an important role. Generally classified according to the skeletal structure. Skeletal structure on the coating hardness, abrasion resistance, adhesion resistance, light resistance, chemical resistance and water resistance.

The prepolymer from the structural point of view, are oligomers containing "C = C" a low molecular weight resin, an unsaturated double bond, such as an acyl group-containing acrylic acid, methyl acrylic group, a vinyl group, an allyl group and the like. There are epoxy acrylate resins, urethane acrylate resins, polyester acrylate resins, polyether acrylate resins, polyacrylic acid ester, unsaturated polyester resin, a resin such as several types. Whereas under the same conditions, the fastest curing speed acryl, so mostly an acrylic resin oligomer.

2, a photosensitive monomer (reactive diluent)

UV ink and UV varnish in the coating machine is required to adapt the viscosity of the coating, typically by adding 20% to 80% of the monomers to lower the viscosity of the prepolymer, and polymerizing the monomer itself, the cured film becomes part of it.

Also called cross-linking reactive diluent monomer is a functional monomer, and its role in the regulation of the ink viscosity of the ink, cure speed and performance of the cured film. Structure containing the reactive diluent "C = C" unsaturated double bond, can be a propylene group, a propylene group methyl, vinyl, and allyl. Given acryloyl light solid fastest, so far used mostly reactive diluent acrylate monomer. Due to different numbers containing acryloyl can be divided into single functional group, bifunctional three categories, releasing effect of various types of functional groups reactive diluents and curing speed is different. In general, the functionality of the more, the faster curing, but the dilution effect is worse.

Traditional reactive diluents, such as styrene, acrylate monomers and other first-generation, they are highly toxic, some acrylate monomer on the skin have a very strong stimulating effect. To reduce the reactive diluent skin irritation, there are usually two ways: First, the use of ethylene oxide, propylene oxide and has ester ring-opening polymerization of monomer molecular weight increase; the second is to change the structure of monomeric ester group; there is a species is to change the method used previously esterification alcohol. In the propylene group to the use of alcohol addition, a polyfunctional monomer is greatly reduced skin irritation, such as when neopentyl glycol diacrylate esterification synthesis, PH value (skin irritation index) was 4.96, and the use of added when synthesized into law, PH value dropped to 0.3.

Recently, the development of some good properties of monomers, such as: alkoxyalkyl acrylate carbonate monoacrylate, imidazolyl monoacrylate, cyclic carbonate acrylate ester monomer, a silicone epoxy monomer, a silicone acrylate esters and ethers of vinyl monomers. When selecting the monomers, should follow the following principles:

a, low viscosity, good dilution effect;

b, fast curing;

c, the material has good adhesion;

d, skin irritation, toxicity;

e, in the coating without leaving any odor.

3, the photoinitiator

The main components of the photoinitiator is capable of absorbing radiant energy, through a chemical change to produce a substance having a polymerization initiator, the ability of the active intermediates, and that any UV curing systems are needed. The photoinitiator can be classified into hydrogen abstraction type and a pyrolysis-type; and the hydrogen abstraction type is the need of compounds containing active hydrogen (generally referred to as co-initiators) cooperates by hydrogen abstraction reaction, the formation of free radicals, is a bimolecular photoinitiator ; cleavage-type photoinitiator is made by the laser, the radical decomposition of the molecule is a single molecule photoinitiators.

(1) hydrogen abstraction type: xylene ketone (BP), for example, benzophenone is used alone, can not make a photopolymerizable ethylenic monomer, which should be the photoinitiator needs are different. The reaction mechanism is different alkyl and aryl groups, a hydrogen atom from the extraction of alcohol and ether, the oxygen easily quenched the excited state benzophenone. While extracting a hydrogen atom from an amine, since the excited state immediately after the formation of a ketone and an amine complex of the excited state is formed, avoiding the energy transfer to molecular oxygen, it is not easy for the amine system, the oxygen quenching, as compared with the ether system and also reduce the possibility of type energy transfer to the monomer. Therefore, in practical applications, generally use an amine system. In addition to benzophenone, the kind of photoinitiators there anthraquinones together Thioxanthone, usual for UV ink are 2-isopropyl-thioxanthone.

(2) cleavage type: the benzoin ethers, for example, benzoin ether was a practical application of the most widely used light initiator, which is characterized by the excited state g directly down into two sessions, the total free radicals. The free radical generating initiator monomer can be polymerized. Benzoin ethers excited state lifetime is short, easy to oxygen quencher, nor are quenched as styrene, it can be used in the polymerization of styrene. But benzoin ethers even seen the light have different degrees of thermal decomposition, storage stability is not good, generally to add stabilizers and polymerization inhibitor, is currently used incense rest dimethyl ether.

Select a photo-initiator should follow the principle agent:

a, of the amount of UV light absorption range of high efficiency;

b, the relative stability;

c, and low cost.

4. Other additives

Additives are mainly used to improve the performance of ink, UV ink auxiliaries commonly used stabilizers, leveling agents, defoamers, dispersants, waxes, and the like.

(1) Stabilizer: Stabilizer is used to reduce the occurrence of thermal polymerization during storage, to improve the storage stability of the ink. Used hydroquinone, p-methoxyphenol, p-benzoquinone, 2,6-di-t-butyl-p-cresol and the like.

(2) leveling agent: leveling agent is used to improve the leveling of the ink layer to prevent shrinkage of production, so that the ink film surface roughness, but also increase the ink gloss.

(3) defoamers: defoamers are used to improve the leveling of the ink layer to prevent shrinkage of production, so that the ink film surface roughness, but also increase the gloss of the ink printing.

(4) Dispersant: dispersant pigment in the ink to make the connecting material good low wettability, good pigment dispersibility in the ink, to shorten the manufacturing time of the ink during the grinding; reducing the amount of oil absorption of the pigment, in order to producing a high concentration of the ink; the pigment particles in the ink to prevent the co-precipitation of coagulation. Dispersing agent is generally a surfactant.

(5) Wax: Wax main role is to change the ink rheology, to improve water resistance, a printing properties (such as adjusting the viscosity), to reduce smearing, and other ills pull paper wool, and the surface of the ink film after drying to form a smooth wax film two to improve the wear resistance and other printed materials. In the UV ink, the wax also acts as an air barrier, reducing the oxygen inhibition effect conducive surface cure. But adding excess wax and ink varieties wrong wax, will reduce ink gloss, destruction ink transfer performance and extend the drying time.

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