Лако-красочные материалы — производство

With the notable exception of high acid value aciylics, where basic pigments should be avoided, in order to prevent viscosity instability or premature gelation, pigmentation does not pose special problems in formulating paints based on thermosetting acrylic resins. For white paints, rutile grades of titanium dioxide are incorporated at pigment/binder ratios from 0.6/1 for automotive […]

Silicone resins, such as the hydroxy functional 26018 (Dow Corning), can be used at up to 20% to enhance the exterior durability of a coating. Normally, however, a reduction in film flexibility is observed. Often non reactive plasticisers, such as saturated polyester adipates or epoxidised soya bean oils, are added in small quantities to thermosetting […]

Alkyds can be used in combination with either acrylamide or hydroxy functional acrylics. Very often this results in an improvement in application solids. However, the alkyd must be carefully chosen, firstly in terms of compatibility with acrylics, and secondly from the point of view of what it will contribute to (or detract from) film performance. […]

Alkoxy ether extended polyols, such as propoxylated glycerol, propoxylated and ethoxylated trimethyol propane, have long been used to plasticise acrylamide based acrylics. Where durability is not important, additions of up to 10%, based on solid resin, to a high styrene level acrylic, result in a significant increase in flexibility with little sacrifice in hardness and […]

Hydroxy functional acrylics will cure with all types of amino resins, including urea formaldehyde, melamine formaldehyde (MF) and benzoguanamine formaldehyde types. Urea formaldehyde resins are faster curing and cheaper than the other two main types, but they are rarely used with acrylics due to inferior film performance (e. g. resistance properties and exterior durability). Benzoguanamine […]

Bisphenol “A” epoxy resins, with an epoxy equivalent weight of 500 or higher, are used in all classes of thermosetting acrylics. When used in conjunction with acrylamide based acrylics at levels up to 10% (based on total solid resin) they enhance adhesion to metals, flexibility, toughness and chemical resistance. However, a maximum level of between […]

Hydroxy functionality is introduced into the back bone of the acrylic via hydroxy functional monomers such as: • Hydroxy ethyl acrylate (HEA) • Hydroxy propyl acrylate (HPA) • Hydroxy butyl acrylate (HBA) • Hydroxy ethyl methacrylate (НЕМА) • Hydroxy propyl methacrylate (HPMA) Additionally, ethylene oxide and propylene oxide extended variants of some of these monomers […]

Commercially available thermosetting acrylics can be conveniently broken down into 3 main basic chemical types:- • Acrylamide functional • Hydroxy functional • Carboxy functional 1. Acrylamide Based Acrylics Acrylamide acrylics contain up to 10% of acrylamide (based on solid polymer). The acrylamide is reacted with formaldehyde and the resultant methylol group is etherified with an […]

I INTRODUCTION Continuing development in the field of acrylic polymers for surface coating applications during the 50’s led to the commercialisation of heat curing, thermosetting acrylic (TSA) resins for use in high quality industrial coating systems for both interior and exterior applications. Whilst retaining the excellent colour and chemical resistance properties already seen in thermoplastic […]

Very few thermoplastic resins are used for metal decorating applications. The major exception is poly vinyl chloride and modified PVC’s which are used in vinyl solutions, organosols and plastisols. Consult the thermoset metal coating section in the next chapter.