Performance of low odor film additives in clean odor coatings.

1 clean taste interior wall engineering paint preparation . In this experiment, the addition amount of film-forming additives was 6% to 14% of the amount added to the emulsion, and the weight of more or less decreased or increased the amount of water added accordingly.2 Results and Discussion
2.1 Odor and VOC
VOC means any organic compound with an initial boiling point below or equal to 250 degrees C (or 14ane (252.6 degrees C), including hydrocarbons, organic halides, organic sulphides, carbide compounds, organic acids and peroxides. At present, the taste of the net taste of interior wall paint is mainly by smell to feel, and VOC requirements mainly in accordance with GB18582-2008 interior decoration material interior wall coating harmful substances limit of 120g/L and HJ 2537-2014 environmental mark product technology requirements water-based coatings 50 g/L standard implementation. Therefore, when selecting film-forming additives for the coating of the net taste interior wall, neither low odor nor VOC can be introduced.the boiling point of the above 5 film-forming additives is higher than 250 degrees C and are not VOC.
smell test was rated by five odor judges and averaged. From the odor test results, whether it is film additives themselves, made into coatings or in confined room construction, GVE odor is the lowest, Coasol and OE300 times, Daplad H and Textanol the largest odor.
2.2 film-forming efficiency
film-forming efficiency is the most important measure of film-forming additives. Film-forming efficiency refers to the magnitude by which the film-forming additive reduces the minimum film-forming temperature (MFFT) of the film-forming substance. In general, paint companies recommend latex paint at temperatures of not less than 5 degrees Celsius. Therefore, the MFFT of the film-forming substance in latex paint needs to be less than 5 degrees C in order to achieve the desired coating effect. Figure 1 is the relationship between the amount added of film-forming additives and MFFT of film-forming substances.as shown in the figure above, Coasol has the highest film-forming efficiency, followed by Textanol and GVE, and the OE300 and Daplad H have the lower film-forming efficiency.
2.3 Wash-resistant
for interior wall engineering paint, wash-resistant is very important performance. According to GB/T9756-2009 synthetic resin emulsion interior wall coating regulations, the qualified product wash-resistant scrub resistance of up to 300 times. As can be seen from Figure 1, when the amount added as a membrane additive reaches 4% of the amount added to the emulsion, the MFFT of the emulsion is less than 5 degrees C. However, the proportion of powder in the interior wall engineering paint is very large, and there are a large number of pores on the surface of the powder, can absorb a part of the film-forming additives. Therefore, the amount of film-forming additives in the inner wall engineering paint is much greater than 4%.can be seen from Figure 2, with the increase of film-forming additives, the paint film's wash-resistant performance increased rapidly. When 10% of the emulsion addition is reached, there is no longer a significant change in the wash-resistant brush performance of the paint film. Some film-forming additives because of its slow volatility, in a large amount of addition, wash-resistant performance has decreased. Therefore, the amount of film additives added in the inner wall engineering paint is generally 10% of the amount added to the emulsion. Coasol's wash-resistant paint film performance improved the fastest, followed by Daplad H and Textanol, GVE and OE300 with slower relative improvements.
2.4 Low temperature stability
in HJ 2537-2014 environmental mark product technical requirements of water-based coatings, products may not be artificially added alkyl phenol polyoxyethylene ether (APEO). Products without APEO generally have poorer low temperature stability than products that contain APEO. Due to the strict regulations of VOC, antifreeze cannot be added too much. Therefore, the addition of film-forming additives can not have a negative impact on the low temperature stability of the coating. GB/T 9756-2009 Synthetic resin emulsion interior wall coating stipulates that the product needs to pass -5 degrees C after 3 freeze-thaw cycle unchanged. Taking into account the error at the time of detection, the temperature at low temperature is generally set at -7 degrees C.3 cycles of freezing and thawing, the coatings using the above 5 film-forming additives were free of hard blocks, flocculation and separation. After the low temperature stability test, Texanol's viscosity changed less, followed by Coasol and GVE, Daplad H and OE300 thickened more.
2.5 Storage stability
the shelf life of a typical latex paint is 24 months. But it takes 24 months to see if the stability of the product is too long. The storage stability of the product is usually observed by placing an accelerated test in an oven at 50 degrees C for 30 days. After storage can not have hard blocks, flocculation, color change and odor, allowing for a slight layering, viscosity changes generally within 5 KU, the maximum can not exceed 10 KU.as can be seen from Table 4, Texanol, OE300, and Coasol have better storage stability. Daplad H and GVE have a large change in viscosity after 30 days of thermal storage.3 conclusion
test results, Texanol's comprehensive performance is the best, but the odor is large, not suitable for use in clean taste coatings. Coasol and OE300 are good choices in clean taste coatings..