Application of hydroxyethyl cellulose in latex paint

Basic information of chuangyao bio hydroxyethyl cellulose

Chinese Name: hydroxyethyl cellulose

English Name: HEC, hydroxyl cellulose

Chemical formula: C2H6O2 · x

Shandong chuangyao Biotechnology Co., Ltd. is a professional manufacturer of hydroxyethyl cellulose. First of all, we understand the technical requirements of hydroxyethyl cellulose produced by chuangyao Biotechnology: hydroxyethyl cellulose is white or light yellow powder, molar degree of substitution (M.S) is 1.8-2.0, water content (%) ≤ 10, water insoluble (%) ≤ 0.5, pH value 6.0-8.5, transmittance %The optimum conditions are as follows: ≥ 80, ash content (%) ≤ 5, viscosity (MPa. S) 2% 20 ℃, aqueous solution 30000-100000, lead (%) ≤ 0.002.

After understanding the basic technical indicators of hydroxyethyl cellulose, we introduce the use of hydroxyethyl cellulose in latex paint in detail.

1. Hydroxyethyl cellulose with congee phenology: because hydroxyethyl cellulose is not easy to dissolve in organic solvents, some organic solvents can be used to prepare porridge. Ice water is also a bad solvent, so it is often used with organic liquids to prepare porridge. Congee like hydroxyethyl cellulose can be directly added to latex paint. In porridge, hydroxyethyl cellulose has been fully inflated. When added into the paint, it will quickly dissolve and play a thickening role. After addition, stirring should be continued until hydroxyethyl cellulose is completely dispersed and dissolved. Generally, porridge is made by mixing six parts of organic solvent or ice water with one part of hydroxyethyl cellulose. After about 5-30 minutes, the hydroxyethyl cellulose will be hydrolyzed and obviously swell. (it is suggested that the humidity of water is too high in summer, so it is not suitable to prepare porridge.)

2. Adding hydroxyethyl cellulose directly when grinding pigment: this method is simple and the time is short. The detailed methods are as follows:

(1) Add appropriate purified water into the barrel of high strain cutting agitator (generally, film forming agent and wetting agent are added at this time)

(2) Start stirring at low speed without interruption and add hydroxyethyl cellulose slowly and evenly

(3) Continue stirring until all particles are evenly dispersed and soaked

(4) Add anti mildew agent and adjust pH value

(5) Stir until all hydroxyethyl cellulose is completely dissolved (the viscosity of the solution increases significantly), add other components in the formula, and grind until the paint is finished.

3. Prepare the mother liquor of hydroxyethyl cellulose for use: this method is to prepare the mother liquor with high concentration first, and then add it into the emulsion paint. The advantage of this method is that it can be directly added into the finished paint, but it should be stored properly. The procedure and method are similar to the steps (1) - (4) of method 2, except that no high shear agitator is needed, and only some stirrer with enough power to keep the hydroxyethyl fiber uniformly dispersed in the solution can be used. Continue stirring until completely dissolved into a viscous solution. It should be noted that the mould inhibitor must be added to the lacquer mother liquor as soon as possible.

4. Precautions when preparing hydroxyethyl cellulose mother liquor

As hydroxyethyl cellulose is a kind of treated powder and particle, it is easy to operate and dissolve in water as long as the following matters are paid attention to.

(1) Before and after the addition of hydroxyethyl cellulose, stirring must be continued until the solution is completely transparent and clear.

(2) It must be slowly sieved into the mixing drum. It is not allowed to directly add a large amount or spherical hydroxyethyl cellulose into the mixing drum.

(3) Water temperature and pH value of water have obvious relationship with the dissolution of hydroxyethyl cellulose, which should be paid special attention to.

(4) Do not add alkaline substances to the mixture before the hydroxyethyl cellulose powder is soaked with water. Increasing the pH value after wetting is helpful for dissolution.

(5) As far as possible, the fungicide should be added as early as possible.

(6) When using high viscosity hydroxyethyl cellulose, the concentration of mother liquor should not be higher than 2.5-3% (by weight), otherwise the mother liquor is difficult to operate.

The factors affecting the viscosity of emulsion paint are as follows

(1) Due to excessive stirring, the humidity is overheated during dispersion.

(2) The amount of other natural thickeners and the ratio of them to hydroxyethyl cellulose in the paint formulation were studied. )

(3) Whether the amount of surfactant and water in the paint formulation is appropriate.

(4) the amount of residual catalyst and other oxides in the synthesis of latex.

5. Microbial erosion of thickener.

6. In the process of paint making, whether the sequence of adding thickener is appropriate.

The higher the content of air bubbles, the higher the viscosity.

Shandong chuangyao biotechnology currently has 2000 tons / year of hydroxyethyl cellulose. The products are widely used in building materials, coatings, synthetic resins, ceramics, daily chemicals, textiles, oil fields, plastics and other industries, with high technology content and high added value, so the market prospect is very broad.

The company has introduced international top production equipment, has the most advanced cellulose ether and latex powder R & D center, and adopts international scientific management methods. After passing the ISO9002 quality system certification, the company passed the ISO14001 environmental management system certification and OHSMS (occupational safety and health certification) in China in 2009 and 2010 respectively. In addition, the company has also won the titles and honors of "national industrial product production license", "advanced foreign investment enterprise", "employment standard and integrity enterprise", "contract abiding and credit worthy enterprise", "provincial high-tech enterprise", "national advanced environmental protection unit", etc.

Shandong chuangyao biotechnology has HEC of all types.