News Details
Waterborne coatings with resin and crosslinking agent
2017-7-2 23:49:28
Waterborne coatings with resin and crosslinking agent
Polyurethane refers to macromolecules that contain many carbamates in the main chain. It is generated by a gradual polymerization of two (or more) isocyanates and two (or more) elements. Polyurethane is one of the excellent synthetic resin. Due to its wide variety of synthetic monomers and wide adjustment of formulation, it is widely used in coatings, adhesives, foam plastics and elastomers.
The study of waterborne polyurethane was developed in the 1950s, 1960s and 1970s, and developed rapidly in the research and development of waterborne polyurethane, which began in the 1970s as a water-borne polyurethane for leather finishing agents. Into the 90 s, along with the people environmental protection consciousness and the strengthening of environmental regulations, environment friendly waterborne polyurethane in the research, development is becoming more and more attention, its application has expanded by leather finishing agent to paint, glue, and other fields, is gradually occupied market, polyurethane (pu) solution represents the development direction of coating, adhesive.
The two-component waterborne polyurethane system is composed of a dispersible body (or emulsion) of polyisocyanate and hydroxy functional groups. In this formulation, polyisocyanates are easily dispersed in water, but are not soluble in water. Instead, they are dispersed by "polyols", which are dispersed by the dispersed body of particles. After the water evaporates, it is produced into a membrane. The viscosity of the high - level - hydroxy dispersible body should be low and have some surface activity.
The group's hydroxyl group also reacts more quickly to the polyisocyanate crosslinker than to water. Therefore, for a two-component water - based system, hydroxyl - hydroxyl is prefered to the isocyanate - base reaction of the polyisocyanate crosslinking agent during normal water volatilization.
A single component of water-based polyurethane coating has only one component, and its molecular skeleton can be linear or branch. It can also be thermoplastic or spontaneous, photoinduced, and heat-induced crosslinked.
Its characteristic is the construction is convenient, do not have the danger of storage gelatinization, but the film performance (such as hardness, wearability, resistance to chemical character) less than the two-component waterborne polyurethane. At present, single component waterborne polyurethane coating resin is a modified water-based polyurethane. There are many modification methods: such as acrylic grafting, epoxy resin and dry oil modification.
In recent years, extensive research has been conducted on the synthesis of waterborne resin.
(1) establish the theoretical method for the molecular weight control of condensation polymerization;
(2) synthesis of waterborne polyurethane leather finishing agent;
(3) the synthesis of single component wood paint with water-based acrylic and polyurethane molecular hybridization;
(4) the composition of single component wood lacquer with water-based polyurethane resin and water-based polyurethane oil;
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
(5) the synthesis of water-based polyurethane resin (hydroxyl component) for two-single component wood paint;
(6) synthesis of industrial baking paint with water-based polyester and alkyd resin; In addition, the synthesis of the dispersible polyisocyanates was also explored.
Main functions and indicators:
1. Performance index of nuclear - shell waterborne polyurethane - acrylic resin
Solid content: 32%; Hardness: > 1 h; Sheen: > 85; Water resistance: 24h no change; Impact: 50kg. Cm; Adhesion: 1-2. In addition, the system is easy to upgrade, can develop high-grade non-yellowing products, and has good adhesion to PS, ABS, PVC, glass and aluminum. It has wide application development potential.
2. Water-based polyurethane and water-based ammonia ester oil dispersive technology index of single component waterborne coatings
Solid content: 35%; Hardness: > 2 h; Sheen: > 85; Water resistance: 24h no change; Impact: 50kg. Cm; Adhesion: 1-2.
3. Two-component waterborne polyurethane coatings with water-based polyurethane dispersion technology indicators
Appearance: blue light milky white liquid; Solid content: 35%; Viscosity: 20-100mpa. S; Hydroxyl value: 100mgKOH/g (resin); PH: 6.5 to 7.5.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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