BASF Dispex® AA4040 NS Anionic dispersant based on polyacrylic acid

Products Description

Dispex® AA4040 NS is a series of high-efficiency, low-viscosity waterborne coating system dispersants Derivatives. This product is especially suitable for the dispersion of inorganic pigments.

Chemical properties: Dispex® AA4040 NS is an ammonium salt solution of acrylic acid polymer .

Technology Parameters

Item	typical data
pH	9.0
Viscosity (25°C) (Brookfield 20 rpm)	400mPa.s
Density (20℃)	1.1g/cm³
PH value	about 5.5-6
solid content	43%
Activity content	40%
Appearance	straw color liquid

Features

Dispex® AA4040 NS formulation is an ideal dispersant for various waterborne coatings

Dispex® AA 4040 NS may be used as supplied. The neutralizing base used with acrylic polymers can significantly affect the properties of the final coating. Dispex® AA4040 NS releases ammonia during the drying process, so it has no small impact on the water and alkali resistance of the dry film.

Use of Dispex® AA4040 NS should be limited to pH 9.0 at temperatures below 70°C for potential loss of volatile ammonia .

With inorganic dispersants, such as polyphosphate products, Dispex based on organic polymers ® AA4040 NS (based on pigment weight) improves pigment dispersion and storage stability of formulated coatings. As shown in the graph below, there was little or no adverse reaction to high temperature or changes in pH, and these examples show an accelerating effect.

Stability of interaction between pigment dispersion and dispersant Brookfield viscosity at 20 rpm mPas

20 rpm mPas Heated Brookfield Viscosity Stability

Adding Dispex® AA4040NS It is recommended to add pigment in heavy stirring water containing dispersant, while Instead of adding a dispersant to the pigment paste. Generally speaking, the pH of the final preparation should be in the 8.5 region to obtain the best dispersion efficiency.

The optimal amount of dispersant needed to form a stable dispersion depends largely on the pigment chemical properties, particle surface and shape. The polymer base of the latex also plays a very important role in the stability equation. In general, a severe excess may deteriorate coating properties (such as water resistance) and create an economical disadvantage. Likewise, insufficient dispersants can lead to unstable storage.

Like other dispersants, batch variation due to specific pigment or latex type requirements , it is recommended that the formulation machine use 1.5-2.0 times the determined optimal dispersant level.

For example: pigment paste system (containing 65% pigment solids) Brookfield viscosity at 20rpmmPas The rheological curve under

0.5-2.0% Dispex®AA4040NS (based on total pigment weight)

Security

Usual safety precautions must be followed when handling chemicals. These measures include those described in federal, state and local health and safety regulations, thorough ventilation of the workplace, good skin care and wearing eye protection.

All safety information is provided on the Material Safety Data Sheet for Dispex® AA4040 NS.

Dispex® AA4040 NS is not expected to produce any harmful effects as long as it is used in its intended purpose and are handled in accordance with current industry practice. Dispex® AA4040 NS may contain technically unavoidable traces of VOCs. Observe the appropriate workplace exposure limits as noted on the Material Safety Data Sheet. Dispex® AA4040 NS may irritate the skin and mucous membranes in prolonged contact with the product.

Dispex® AA4040 NS is not classified as a hazardous product under DOT or OSHA regulations, according to WHMIS (Canada) regulation is not listed as a controlled product. It does not contain any hazardous ingredients that would affect labeling under this regulation.

Save

Dispex® AA4040NS is freeze stable and is recommended at temperatures above 5°C Store the product for easy handling of the product.

Important

While descriptions, designs, data and information contained herein are given in good faith presented and believed to be accurate, but they are for guidance only. Since many factors may affect processing or application/use, BASF recommends that readers perform tests to determine the suitability of a product for a particular purpose before use. NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR THE PRODUCT DESCRIPTIONS OR DESIGNS, DATA OR INFORMATION, OR USE OF THE PRODUCTS, DESIGNS, DATA OR INFORMATION, IS DISCLAIMED. In no event shall the descriptions, information, data or designs presented be considered part of BASF's terms and conditions of sale. In addition, the descriptions, designs, data and information provided by BASF under this agreement are provided free of charge, and BASF assumes no obligation or responsibility for the above descriptions, designs, data or information or the results obtained, and the risk is borne by the reader.

Information is presented in good faith and is believed to be accurate, but they are for guidance only. Since many factors may affect processing or application/use, BASF recommends that readers perform tests to determine the suitability of a product for a particular purpose before use. NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR THE PRODUCT DESCRIPTIONS OR DESIGNS, DATA OR INFORMATION, OR USE OF THE PRODUCTS, DESIGNS, DATA OR INFORMATION, IS DISCLAIMED. In no event shall the descriptions, information, data or designs presented be considered part of BASF's terms and conditions of sale. In addition, the descriptions, designs, data and information provided by BASF under this agreement are provided free of charge, and BASF assumes no obligation or responsibility for the above descriptions, designs, data or information or the results obtained, and the risk is borne by the reader.