1. Coating

Coating

Definition of paint: paint is generally filled with film-forming substances(pigment filler(pigment filler(pigment filler(pigment filler(pigment filler(pigment filler(pigment filler span>), solvents, additives and other four parts, refers to a kind of deep covering The general name of the materials that can form a solidly adhered continuous protective film on the surface of the object to be coated

  1. Paint distribution:

Classified by status

Classify by color

Classified by transparency

Classified by gloss

  1. By painting object:

Car paint

Wall paint

Wood paint

Ship paint

Plastic paint, etc.…

  1. According to the main film-forming substances:

NC (Nitrolace): Nitrocellulose

PU (Polyurethane paint): Alkyd resin

PE (Unsaturated polyester paint): Unsaturated polyester

AC (Acid hardening paint): amino resin

  1. Different according to the drying method:

Room temperature curing coating

Bake paint

UV (Ultraviolet curing coating)

  1. By function:
  2. primer

Closed primer (Head paint)

Transparent primer

Colored primer (White primer)

  1. Face paint

clear top coat

Colored transparent topcoat (Color trimming finish)

Colored finish (White paint)

  1. According to paint status (the components participating in the reaction)

Single-component line paint: the paint can be used directly alone, or just add dilution to paint (such asNC)

Two-component line paint: The paint has a main agent and a hardening agent. After the two-components are mixed, the coating will dry and harden, and the paint has a certain ratio of blending. (such asPU ,AC)

Three-component line paint: The paint has main agent and accelerator respectively(Blue water), hardened Agent(white water), the three will dry and harden only after mixing with each other (e.g. PE)

  1. Other categories:

According to gloss, color, transparency, construction technology, etc.

  1. Basic composition of paint

Paint

  • Paint distribution:

Classified by statusClassify by colorClassified by transparencyClassified by gloss

  • By painting object:

Car paintWall paintWood paintShip paintPlastic paint, etc.…

  • According to the main film-forming substances:

NC (Nitrolace): NitrocellulosePU (Polyurethane paint): Alkyd resinPE (Unsaturated polyester paint): Unsaturated polyesterAC (Acid hardening paint): amino resin

  • Different according to the drying method:

Room temperature curing coatingBake paintUV (Ultraviolet curing coating)

  • By function:
  • primer

Closed primer (Head paint)Transparent primerColored primer (White primer)

  • Face paint

clear top coatColored transparent topcoat (Color trimming finish)Colored finish (White paint)

  • According to paint status (the components participating in the reaction)

Single-component line paint: the paint can be used directly alone, or just add dilution to paint (such asNC)Two-component line paint: The paint has a main agent and a hardening agent. After the two-components are mixed, the coating will dry and harden, and the paint has a certain ratio of blending. (such asPU ,AC)Three-component line paint: The paint has main agent and accelerator respectively(Blue water), hardened Agent(white water), the three will dry and harden only after mixing with each other (e.g. PE)

  • Other categories:

According to gloss, color, transparency, construction technology, etc.

  • Basic composition of paint

Paint

Main film-forming substancesSecondary film-forming substancesAuxiliary film-forming substance
ResinColoring dyes
Main film-forming substancesSecondary film-forming substancesAuxiliary film-forming substance
ResinColoring dyes：Volatile type and substance Change; Nitrocellulose is mainly made of nitrocellulose, added with resin, plasticizer, solvent and auxiliary agent; Nitrolacquer is a one-component paint, which is a volatilized filmMain agent

Banana water Press Proportion mixing and stirring evenly＞Mixed liquid＞Can be constructed

Application:

Paint + Banana Water= 1 :1~3

*Note: Banana water is a mixture of esters, alcohols, ketones, toluene and other organic solvents A colorless and transparent liquid with a banana odor

Film formation: When the solvent in the paint film runs out, we can think thatNC</span >The paint is dry (filmed)

Advantages: easy to use, quick-drying and best solvent release

Disadvantages: low solid content, poor chemical resistance, brittleness and yellowing of the paint film

Usage: American furniture painting and indoor home decoration

  1. PUCoating (polyurethane coating): two-component,2KPaint

Polyurethane paint is formed by the reaction of the main agent and hardener to form a film. Because the product contains urethane chemical bonds, it is called polyurethane paint. Banana water plays a role in dissolving resin and adjusting viscosity.</ span>

Main agent

hardener mix and stir evenly in proportion>mixed liquid>can be applied

Banana water

Film formation: cross-linking reaction at room temperature, chemical change

Crosslinking reaction between functional groups:R-OH + R-NCO< span style=”font-weight: 400;”>＞R

The film forming process is: main agent (-OH) Hardener (-NCO) two sets The bright molecular chemical elements in the composition produce a chemical reaction to form a film

Paint + hardener ＞Film formation

Hydroxy paintOH ,R-NCOgroup, isocyanate compound

Only paint, no hardener does not dry, only hardener does not dry paint

PU Disadvantages of paint:

Inconvenient paint mixing, two-component, limited use time (4 hours used up)

The construction environment has high requirements, is sensitive to water, and the paint film damage is not easy to repair; the surface drying speed is slow, and the environment is required to be very clean, blistering in damp, paint film powdering, etc.</span style=”font-weight: 400;”> span>

After the paint film is dry, sanding is required when recoating, otherwise it will affect the adhesion

Especially when painting at high temperature, it is necessary to pay attention to the fact that the paint is prone to pinholes, blisters, and surface drying too fast. The solvent gas in the paint film remains in the paint film, resulting in bubbles. That’s why banana water has winter and summer points, which is to adjust the drying speed under different temperature conditions.

There is gas released during construction, pay attention to good exhaust (free TDI,TVOC )

Usage: Furniture painting, indoor home decoration

Application:

Paint + hardener + banana waterPUSL

1 : 0.5 : 0.5~1

  1. PECoating (unsaturated polyester coating): Multi-component coating</span >

Advantages: one-time thick coating, easy to sand, especially suitable for primer, one-time performance thick coating, not easy to foam, sag, high solid content, high hardness and fullness It has a good degree of strength, and this type of paint is commonly used as a base.PU Call it classic craftsmanship

Disadvantages: Multi-component coatings, the drying process is easily affected by various components and environmental factors, and the smell is strong and irritating

Application:

Paint + hardening (white water) + accelerator (blue water) + thinner

100 :< /span> 1 : 1~1.2 : 30

  1. ACCoatings: acid-cured coatings, two-component coatings, cross-linked, hardened The agent is weak acid and can be used as primer and top coat, but because it is cheap, fast-drying, and easy to wear, it is mostly used as a primer, which has the disadvantages of big odor
  1. UV Primer: UV-curable coating, one-in-two-component coating, chemical Variation, solvent-free coating

Application:

Single component: the paint contains a photoinitiator

Two-component: only add photoinitiator during application, the amount varies

Advantages: instant drying, drying time is generally in seconds, fast coating speed, fast yield , The biggest advantage

is in line with environmental protection direction

Disadvantages: the painting equipment is expensive, the one-time investment is large, and the requirements for coating technology and painting technology are high

  1. WCoating: water-based paint, water-based resin as the main film-forming substance, add water to adjust Can be applied to the construction viscosity

Advantages: environmental protection, convenient construction

Disadvantages: slow drying