Properties of Emulsion Paint with Modified Natural Rubber Latex/Polyvinyl Acetate Blend Binder

Abstract

The direct use of natural rubber latex (NRL) as a binder for emulsion paints did not produce emulsion paints with good opacity, washability resistance, and regulated touch drying time, even when mixed with polyvinyl acetate (PVAc). This study aimed to study the properties of opacity (hiding power), washability resistance, and set drying touch time of emulsion paint with a binder added from a mixture of modified natural rubber latex (NRL) and PVAc. NRL modifications included UV photodepolymerization with TiO2 catalyst and grafting copolymerization of methyl methacrylate and styrene (NRL-g-(MMA-co-St)). NRL was mixed with PVAC at ratios of 0/100; 15/85; 25/75; 35/65; 50/50; 100/0% w/w before being used as a binder for emulsion paint. Emulsion paint samples had different binder contents, namely 2, 4, 6, and 8% w/w. Tests on paint samples included opacity using a UV-Vis spectrophotometer (EASYSPEC safas Monaco), washability using the Digital BGD 526 Wet Abrasion Scrub Tester, and drying time set using the ASTM STP500 procedure. The results showed that the opacity (hiding power), washability resistance, and set drying touch time met the emulsion paint standards for all binder levels, except the 100% w/w modified NRL composition. The higher level of NRL in the binder causes these properties to decrease and become unstable. The best opacity (hidden power), washing resistance, and drying touch time were obtained on modified NRL with a concentration of 15% w/w. The binder content in the paint was around 4% w/w, with an opacity of about 1.78% abs, washing resistance of 12 times, and the set drying touch time to 80 min.

Formulation of emulsion paint using benign HGSO/PVAc copolymer as a binder

“…On comparison with the PVAc binder, the novel PVAc/HGSO copolymer binder showed improved properties in viscosity, which means better application of paint, high refractive index which means an improve in paint sheeness and low moisture uptake which implies durability [22]. This result is also in consonance with Ibrahim, et al [12] who investigated the feasibility of using blend of natural rubber with Polyvinyl acetate as a copolymer binder for an emulsion paint. Muhammad and Yelwa [18] agreed that modifying polyvinyl acetate as an emulsion paint binder, has an advantageous benefit to the coating industry.…”

“…This is known as wash-ability resistance. According to Ibrahim, et al [12] the higher the washability resistance, the better the quality of the emulsion paint. The paint made from the novel PVAc/HGSO and PVAc were exposed to salt, acid and alkaline solutions.…”

“…Although, previous studies [9,10] revealed that water-based paint (Emulsion Paint) was reported to be environmental friendly , since there is no release of harmful substance to the environment, but [2,5] reported that water-based paint has poor glossiness and high moisture uptake which encourages bacteria activities and overall, affect the durability of the paint. According to Gidigbi, et al [1]; Gopalan, et al [11]; Ibrahim, et al [12] the binder is an essential paint's ingredients, as it is responsible for film formation in paint. Polyvinyl acetate (PVAc) is a major binder used in the formulation of emulsion paint.…”

Mechanical Performance of Asphalt Mixture Containing Cup Lump Rubber

“…Natural rubber can be efficiently used as an additive in asphalt modification. It is stated that the elastomeric properties of natural rubber potentially impart high stability, excellent tear strength and fatigue resistance which could enhance the durability of road pavement [1][2][3]. Laboratory assessment and some full-scale road trials were established using the rubberized mixture to improve the performance of road surfacing since the early 1950s.…”