What are the water based paint resins? Classification and feature description

When choosing an epoxy adhesive, a number of factors should be considered. Here are some small experiences that I hope will help you. As a high-performance, high-value-added adhesive, epoxy resin adhesive is highly valued by the industry, but at the same time, counterfeit and shoddy products are often patronized.

Therefore, we can identify it by the following chemical methods. The first method: dissolve the sample in sulfuric acid, then add concentrated nitric acid, and pour a large amount of sodium hydroxide solution, if it is yellow, it is generally epoxy resin.

The second type: drop 5 drops of concentrated nitric acid on the resin adhesive film, move the reactant into the test tube after a few minutes, add 6ml of acetone and then add potassium hydroxide ethanol solution to make it alkaline, if it turns from red to purple, it indicates that it contains epoxy resin glue containing bisphenol A type, this method is also intuitive; Method 3: Take....

Classification: 1: It is a water-based wood paint with propylene nucleochromic acid as the main component;

2: Water-based wood paint with acrylic acid and polyurethane as the main component;

3: Polyurethane water-based paint;

4: Pseudo-water-based paint.

Advantages of water-based paint: 1. Water is used as a solvent, which saves a lot of resources; Eliminates the risk of fire during construction; Reduced pollution to the atmosphere; Only a small amount of low-toxicity alcohol ether organic solvent is used to improve the working environment conditions. Generally, the organic solvent of water-based coatings (accounting for 15% of coatings) is between 15% and 15%, while cathodic electrophoretic coatings have been reduced to the following, which has a significant effect on reducing pollution and saving resources.

2. Water-based coatings can be directly coated on wet surfaces and wet environments; It has good adaptability to the surface of the material and strong adhesion of the coating. 3. The coating tools can be cleaned with water, which greatly reduces the consumption of cleaning solvents and effectively reduces the damage to construction personnel. 4. The electrophoretic coating film is uniform and flat.

Good flattening; The inner cavity, weld, edges and edges can be coated with a certain thickness of coating film, which has good protection; The electrophoretic coating has the best corrosion resistance, and the salt spray resistance of the thick film cathode electrophoretic coating can reach up to 1200h.

All coatings that use water as a solvent or as a dispersion medium can be classified as water-based paints. Water-based paint can be divided into three types: water-soluble, water-dispersed, and water-dilugent.

How to spray water-based paint:

First, the base layer is treated, the ash blocks, oil stains and other sundries on the decoration surface are cleaned, and the wall hemp surface, honeycomb, holes, and defects are filled. After the putty is dry, use a knife to smooth the excess putty, and then polish it with coarse sandpaper;

Then the middle layer of paint is applied, and the paint is fully stirred. Brush horizontally and then roll longitudinally to drive the paint away and flatten. The rolling coating sequence is generally from top to bottom, from left to right, first far and then near, first the corners and corners, small surfaces and then large surfaces.

The thickness is required to be uniform to prevent excessive coating from falling. The first pass of the middle coat is dried before the next polishing process can be carried out.

The last surface layer is sprayed, due to the different base materials, tooth periods, alkalinity and dryness, test spraying should be carried out on the local wall in advance to determine the compatibility of the base layer and the coating, and the container should be fully shaken before use to make it fully mixed evenly, and then the container should be opened and fully stirred with a wooden stick; When spraying, the mouth should always be perpendicular to the decorative table (especially in the dark corner), and the distance is about to be adjusted according to the size of the decoration surface), and the nozzle pressure is the spray gun in a Z-shaped shape, and the horizontal and longitudinal crossing.

Water-based paint is a kind of paint that does not contain organic solvents, and it is a relatively environmentally friendly paint. Let's take a look at the advantages and disadvantages of water-based paint! Advantages of water-based paint: ?

This paint uses water as a solvent, which reduces pollution to the atmosphere. At the same time, a significant part of the resources are saved. This point is very progressive for today's energy shortage.

So this kind of paint has been recognized by many people. In addition, the coating tools of water-based paint can be cleaned with water, which saves the consumption of cleaning solvents. Finally, the water-based paint is particularly adaptable to the surface of the material, and the adhesion of the coating is very strong.

Water-based paint disadvantages: Water-based paint has so many advantages, not that it does not have disadvantages. Water-based paint has high requirements for the cleanliness of the surface of the construction process and the material, and if the cleaning is not very clean, the effect of the water-based paint will also be greatly affected.

Another disadvantage is that the water resistance of water-based paint is a bit poor. This has led to many people giving up this paint when decorating.

Advantages: 1. It has good anti-rust and anti-corrosion, not easy to be infiltrated and oxidized by water, and can be used on the surface of some metal, wood and other objects.

2. Take water-based industrial paint as an example, the color is beautiful, the gloss is good, the paint film is full, the high solidity and low viscosity are improved, the thickness of the spraying film is improved, and the advanced modified resin is used to strengthen the protective and decorative appearance of the workpiece.

Automobile water-based paint spraying method:

1. Use clean water to adjust the paint to a viscosity suitable for spraying, and measure it with a coating-4 viscometer, and the appropriate viscosity is generally 20 seconds and 30 seconds. If there is no viscometer for a while, you can use the visual inspection method: use a rod (iron rod or mallet) to stir the paint evenly and then pick it up to a height of 20 cm to stop and observe, if the paint liquid does not stop in a short time (a few seconds), it is too thick; If the line is broken as soon as it leaves the top edge of the barrel, it is too thin.

When staying at a height of 20 cm, the paint liquid will form a straight line, and the flow will be cut off in an instant, and this viscosity is more suitable.

2. The air pressure is better controlled in megapascals (3 4 kgf square centimeters). If the pressure is too small, the paint liquid atomization will be poor, and the appearance will constitute pitting; Too much pressure is easy to sag, and the paint mist is too large, which not only spoils the paint but also affects the health of the operator.

3. The interval between the nozzle and the surface of the object is generally 300 mm and 400 mm. When it is too close, the paint film is easy to sag; If the paint mist is too far away, it is easy to show pitting, and the nozzle is far away from the object surface, and the paint mist will consume materials when it is scattered on the way. The specific size of the interval should be appropriately adjusted according to the variety of coatings, viscosity and air pressure.

The spraying interval of slow-drying paint can be farther, and the spraying interval of fast-drying paint can be closer; When the viscosity is thick, it can be closer, and when the viscosity is thin, it can be farther away; When the air pressure is high, the interval can be a little farther, and the pressure can be a little closer; The so-called closer and farther refers to a small range of adjustment between 10 mm and 50 mm, if you exceed this range, it is difficult to obtain a better paint film.

4. The spray gun can be moved up and down, left and right, and it is better to operate evenly at a speed of 10 12 meters, and the nozzle should be sprayed straight on the surface of the object, and the oblique spraying should be reduced as much as possible. When spraying on both ends of the surface, the hand that pulls the trigger of the spray gun should be quickly loosened to reduce the paint mist.

5. When spraying, the next one should press the 1 3 or 1 4 of the previous one, so that there will be no leakage. When spraying fast-drying paint, it needs to be sprayed in order at one time, and the respraying effect is generally not satisfactory.

6. When spraying outdoors in an open area, pay attention to the wind direction (it is not suitable to work when the wind is strong), and the operator should stand in the downwind direction to prevent the paint mist from being blown to the painted paint film to form an ugly granular appearance.

7. The order of spraying is: first difficult and then easy, first inside and then outside. First high and then low, first small area and then large area, so that the paint mist that is sprayed after the formation will not splash on the sprayed paint film and damage the sprayed paint film.