•Binder基料 •Colour pigments着色颜料 •Extenders体质颜料 •Solvents溶剂 •Additives添加剂
What is a binder 什么是基料 ?
A binder is a fluid or a solution that forms a film during drying or curing 基料的定义: 一种液态的或溶液, 经过施工干燥和固化能成漆膜的物质.
• The binder absorbs oxygen from the air, causing
the binder molecules to link together to form larger macro molecules.
• The original binder molecules are “free to move”
Large molecules gives: a) Good mechanical strength b) Good chemical resistance
Physically drying binders: Molecules are large before drying starts
Chemically curing binders: Large molecules are formed during curing
Polymer molecules are packing:
Polymer molecules stick together (no chemical bonds):
Curing mechanism of two - pack paints
Solvents evaporating
= Polymer
• Chlorinated rubber • Vinyl • Acrylic • Asphalt • Tar
Chemically curing
• Epoxy • Polyurethane • Polysiloxane • Polyester/Vinyl
ester
• Silicate
Oxidative curing (drying) binder
The properties of a paint will be decided by the binder
• Describes the type of paint/coating
决定油漆/涂料的类型
• Bind pigments and extenders to a solid film
将油漆中分散的颜填料结成一个连续的固体漆膜
from the beginning and therefore dry faster than linseed-oil.
Alkyd curing (drying) process
Oxygen O2
Solvent
Wet film Substrate
Dry film Substrate
Curing (drying) through oxidation
= Curing agent (hardener)
Polymer & hardener molecules reacted to form a new chemical substance:
Advanced paints
• Alkyd • Acylic • Vinyl • (Vinyl tar) • Epoxy • (Epoxy tar) • Epoxy mastic/ modified
• Provides the adhesion to the substrate
使漆膜附着在所涂装的底材上
• Provides the water, chemical, solvent and UV resistance
使漆膜具有耐水, 耐化学品,耐溶剂以及抗紫外线性能
The dry binder consists of large molecules
Drying/curing takes place by干燥和固化的发生是由:
A.
Solvent/water evaporate 溶剂/水的挥发
(physically drying 物理干燥).
B. Solvent evaporation and a chemical reaction takes place during the drying process 溶剂挥发和化学反应同时进行的过程 . (chemically/curing 化学固化干燥).
while the macro molecules in the dry film are fixed.
• Air drying alkyds and boiled linseed oil dries in this way.
• Alkyds, however, have comparatively larger molecules
Solvents evaporating
Oxygen enter. Reaction starts:
Polymer molecules linked together through chemical bonds
Physical drying. Solvent borne paints
Solvents evaporating
Questions:
如果用含Thinner No 17的布擦洗下列漆膜, 将有什么现 象发生?
丙烯酸系列油漆 Acrylic Paint (Pioner TC) 醇酸系列油漆 Alkyd Paint (Pilot II) 环氧系列油漆 Epoxy Paint (Penguard TC)
Paint consist of 油漆的组成:
Different drying / curing processes
• Oxidatively curing (drying) • Physically drying • Chemically curing
Curing Mechanism of Binders
Oxidising
• Alkyd
Physically drying