Do you know all these key points of paint dyeing?

What is paint
the difference between paint and dye word, but dyeing style is very different,
paint's main dyeing ingredients are pigments, essentially pigment coloring.
need to be evenly dispersed in organic solvents or water with the help of surfactants such as dispersants and emulsizers to form coating slurry.
Coating dyeing principle
coating dyeing method is different from traditional dye dyeing, because
dispersants are mostly non-ion, so the coating slurry is also anionic
,
cellulose-like anionic fibers have a natural charge refraction force can not be dyed, at the same time the coating and other fibers do not have affinity, can not be like dispersed dye into the fiber inside .
When dyeing a coating, add adhesives, crosslinkers, etc. to the coating slurry to make paint dyes, after the fabric is soaked and rolled, through high temperature baking, crosslinking agent cross-linking ingredients and active groups in the adhesive molecules, between fibers and adhesives, adhesive polymers,
form a mesh film with a three-dimensional spatial structure, the pigment is embedded and firmly attached to the fabric
, so as to achieve the purpose of "top dyeing".
dyeing method and process key point
rolling dyeing:
because the coating on the fiber has no affinity, can not rely on direct adsorption on the dyeing fiber, so in the early stages of paint dyeing, can only use rolling dyeing dyeing. When the coating is rolled, the coating is absorbed to the fiber by mechanical immersion, dried and baked after the dyeing, and the coating is fixed to the fabric surface by the adhesive film.
this process is still in use, especially in light colors and finishes when the application of general
(1) suitable room temperature immersion rolling, to prevent the adhesive premature reaction bonding rollers.
(2) pre-baking should use infrared or hot air dry, can not use the oven dry.
(3) baking temperature should be determined according to adhesive properties and fiber material, so as not to affect dyeing fastness.
(4) For cellulose fiber and protein fiber products, baking temperature should not be too high, to prevent the fabric yellowing and damage to the fabric.
rolling and dyeing,
adhesive is easy to bond the drum, need to often clean the production equipment, labor intensity is high.
the coating slurry, it needs to be baked at high temperature to cure the adhesive and consume a lot of energy. And the use of a large number of adhesives, resulting in the fabric feel rough. The traditional rolling and dyeing process of coatings is only suitable for flat fabrics, and can only dye light color, not medium and dark color.
fabric cation modifier:
In recent years, domestic and foreign researchers have developed a number of coating dyeing aids, the most used is cation modifiers and wet friction fasteners.
modified or branched the fiber by cation modifier, so that the coating can rely on electrostitive adsorption to directly dye the fiber.
the appearance of cation modifiers makes the coating widely used in rolling dyeing, leaching dyeing and ready-to-wear dyeing, and realizes the requirements of dark dyeing in coatings. Wet friction fastness boosters can replace some adhesives and can
reduce the use of adhesives
, improving performance indicators such as the feel of the fabric after coating staining and friction fastness. Wet friction fastness enhancer can also be used in the same bath with softener, reducing the reprocessing process, which is conducive to reducing production costs.
coating cation change:
traditional coating dyeing process due to the use of a large number of adhesives, dyeing fabric feel poor. The cation-modified coating dyeing process reduces the use of adhesives, but the modified process is long and the homogeneity is poor. Cation coating on the fiber material adsorption dyeing, do not need to change the fiber treatment, the use of fiber with anion, can achieve exhaust dyeing, dyeing process reduction, wide applicability, good feel
physical change:
mainly through physical action on the surface of the fabric to form etching, increase fiber roughness, and the introduction of active groups, thereby improving the coating adsorption capacity of the fabric. After plasma treatment, the coating can significantly improve the coloring ability of the fabric, after processing the K/S value of the dyed fabric, the color fastness and feel of the fabric and cation-modified treatment.
the advantages of coating dyeing
the advantages of coating dyeing compared with traditional dye dyeing.
coatings are not selective to fibers and are suitable for dyeing a variety of fibers.
in addition to dyes can not be dyed fiberglass, metal fibers, etc. , especially suitable for multi-group fiber dyeing
process is short, energy saving, water saving, consumption reduction
excellent sunburn fastness, color stability, color stability, etc.
dyeing fabric has a unique style,
cotton fabric coating dyeing after cellulase treatment with obvious imitation, washing effect.
seven complete, bright colors, especially fluorescent coatings to make up for the absence of active dyes, can obtain a dazzling, bright fluorescent dyeing effect

If the dye is medium and dark, the process
needs to be increased, such as the use of active dye bottoming and then paint dyeing, or first the use of modifiers to change the charge properties of fabric fibers, and then paint dyeing
.
the use of anion-type adhesive, fabric feel more rigid plate, usually need to be soft and other secondary finishing.
is limited to medium light
, dyeing dark color is difficult, color brightness and hair intensity is not as good as dyes, individual bright colors such as indistinct color, color light can not meet the requirements
Poor overhang, fabric foldable
dyeing adhesive will adhere to the roller
, blocking the mesh, need to often clean equipment
part of the adhesive synthetic monolith containing toxic substances, the presence of formaldehyde release and other issues.
the staining effect of the coating particle size
the covering force of the coating depends on the pigment particle size.
In a certain range, the smaller the pigment particles, the stronger the reflection of light in the pigment particles and air interface, the better the cover force
The experiment shows that when the particle size is in the range of 100 to 300 nm, the difference of wet and dry friction fastness of the fabric is not obvious.
when the particle size is less than 100nm, the wet and dry friction fastness of the fabric can be significantly improved, but the fastness of soap washing and brushing decreases.
particle size also affects the stability of the coating slurry.
particle size is too large, paint slurry stability is reduced, easy to appear layering phenomenon;
particle size is distributed between 100 and 200nm, the stability of the slurry is more than 80%.
.