Paint Chemicals Industry Newsletters Vol. 2
Optimizing Microbial Protection in Paints
Paint formulations contain standard industrial biocides for in-can preservation and stability. However, in-can preservatives do not necessarily offer dry film protection, as the dynamics of microbial protection change when the paint film dries. Furthermore, Environmental and Protection Agencies registrations and regulations dictate the kind of antimicrobials that can be employed for dry film protection and claims that can be made from the use of these antimicrobials.
Formulating paints that have long-term dry film protection is challenging. For outdoor applications, variations such as the direction a painted surface faces can create dramatically different responses to how the paint is attacked by algae and fungus.
There are a number of laboratory-based test standards available for the determination of antifungal and antibacterial performance of dry paint films. These allow evaluation against standardized microbial challenges under predictable and reproducible conditions. A number of these methods may be specified by designers, architects or standards organizations, but it is important to understand what aspects of antimicrobial performance they are intended to evaluate. For example, in an antifungal test method such as ASTM G21, samples are placed horizontally in contact with a nutrient-poor salt agar and directly inoculated with a selection of fungal spores.
Another ASTM standard, D3273, exposes samples to an airborne selection of fungal spores by vertically suspending them above an inoculated soil bed contained in a warm, humid chamber. These tests can express the antifungal attributes of dried coatings and paint films in drastically different ways, and coating formulators must, therefore, take care in selecting test standards that are most relevant to their end-use application.
For outdoor paints, there are ASTM standards that prescribe realistic outdoor exposures for expected use conditions.
Factors that can impact performance such as surface angle to the horizon, the degree of surface condensation, the degrees of shade, acid rain and pollution, are taken into account by these methods.
Loveth Irede - Quality Control Manager, Triton International Company Limited
Q. Kindly give a brief background about yourself and your company?
Ans. My name is Loveth Irede and I am the Laboratory/Quality Control Manager at Triton International Company Limited. I have been with my company for 5 years. I have a Master of Science and Bachelor’s degree in Industrial chemistry. Triton International Company is a Paint manufacturing and trading company. We are the manufacturers of TRITON PAINT AND TRISTANDARD PAINT and sole representative and distributor of WALLPLAST HOMESURE WALL PUTTY in Nigeria.
Q. When you first got involved/partnered with Cormart, what was your first impression?
Ans. I got introduced to Cormart by our general manager Mr. Adallah Ghraizi and I must say, I was amazed by the wide range of chemicals they have available.
Q. What specific area has our product improved your business productivity?
Ans. Cormart product has improved our business in terms of helping us maintain our production cost . For example, their Styrene Acrylic does not cut the viscosity during production hence reducing and eliminating any need for adjustments during production.
Q. What value do we provide that makes you decide to stay with us?
Ans. The fact that Cormart welcomes and act on customer reviews is amazing. Also, in terms of time saving and ease of purchasing raw material, your sales team are very efficient and willing to assist us to ensure we receive our orders promptly.
Q. How can we serve you better to sustain our business relationship with you?
Ans. By working better on your store department and making follow up calls when we purchase any of your newly introduced product.
Product Spotlight: SIPERNAT® 820A
Vinkocide® CMIF/CMIF 35
SIPERNAT® 820A is a white-colored amorphous solid synthesized by the reaction of chemical precipitation between a sodium silicate and an aluminum salt in aqueous medium.
SIPERNAT® 820A has highly structured particles that provide film reinforcement, TiO2 spacing, sheen uniformity, and excellent dry opacity.
It is a filler with many different applications, and it is used as a raw material in sectors such as the manufacturing of paints, printing inks, rubber or paper sector.
- The improvement of the optical properties: higher degree of brightness and opacity,
- Cost saving in the paint,
- An improvement of the properties of the paint applied on conferring greater resistance to wash and friction and less tendency to fouling.
- High PVC architectural paints.
- High hiding wall primers.
- DIY paints applied using brush, spray, or roller.
- Mid-sheen premium quality wall paints.
- Breathable façade and concrete coatings.
Contact your Paint Chemical sales representatives for more information.
Technical Advice & Tips
SELECTION OF RHEOLOGY MODIFIERS
Formulators of waterborne coatings, whether architectural or industrial, face many hurdles as they try to comply with environmental concerns and maintain high performance.
One class of chemical additives that plays a key role in the development of high-performance coatings is rheology modifiers. Rheology modifiers help in controlling paint shelf stability, ease of application, open time / wet edge and sagging. They influence leveling, settling and film forming. Depending on rheology modifiers features and required adjustments, they are added to the mill-base or during let-down.
Rheology modifiers can thicken or alter the rheology of a coating in a number of ways. Associative and associated thickening mechanisms are the primary ways in which coatings obtain a rheological profile.
Here is a list summing up the main things to consider when selecting your rheology modifiers thickeners for paint:
- Required rheological properties
- Sag resistance
- Flow and leveling
- Application performances: spraying, brushing. (brush- drag)
- Stability: sedimentation, syneresis
- Liquid paint performances
- Appearance (transparency, color, stability)
- Paint film performance properties
- Water resistance
- Regulation Compliance.