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Alkyds can be modified (blended with ) acrylic resins/emulsions or other polymers such as phenolic resins or urethanes, so all acrylic alkyds are modified alkyds, but not all modified alkyds are acrylic alkyds. Both are pretty general terms, but modified alkyd is much more vague and proprietary. The term "Acrylic Alkyd" is usually reserved for alkyds which have been chemically modified with acrylic monomers such as methyl methacrylate, methacrylic acid, styrene, vinyl toluene, etc. These acrylic monomers are incorporated into the alkyd molecule by addition polymerization. Such alkyds are generally characterized by faster solvent release, quicker tack-free time, better hardness, blocking resistance, color and color retention, and durability, depending on the choice of monomers and amount of acrylic content. These alkyds are also more expensive than conventional alkyds due to higher cost of monomers and the additional manufacturing steps required.
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TaigaAcrylic alkyd is a type of alkyd resin modified with acrylic to improve durability, gloss, and color retention. Modified alkyd refers to any alkyd resin that has been altered or enhanced with additional compounds to change its properties, which can include acrylic modifications but may involve other additives as well.
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Is Alkyd an acid or allaline?
Alkyd is neither an acid nor an alkaline substance. It is a type of synthetic resin used in the production of paints and coatings, typically made by combining polyols, acids, and vegetable oils.
What is the difference between solid polymer and liquid polymer?
Solid polymers have tightly packed molecular chains that give them a rigid structure, while liquid polymers have more freedom of movement between their molecules, allowing them to flow like a liquid. Solid polymers are often used in applications requiring mechanical strength, while liquid polymers are more commonly found in coatings, adhesives, and sealants.
What are the plastics hydrocarbon and alkyd used for?
Plastics are a type of polymer material used for a wide range of applications, such as packaging, consumer goods, construction, and automotive parts. Hydrocarbons are organic compounds consisting of only hydrogen and carbon atoms, which are used as feedstock for producing plastics through processes like polymerization. Alkyd resins are synthetic resins made from the reaction of polyhydric alcohols and polybasic acids, often used as binders in paints and coatings.
Name of a colourless crystalline compound used in making resins?
One example of a colorless crystalline compound used in making resins is maleic anhydride. It is a cyclic compound that is widely used in the production of resins such as unsaturated polyester resins and alkyd resins due to its ability to undergo polymerization reactions.
Why does old white plastic turn yellow?
While plastic is usually considered an "artificial" material, it is typically a polymer based on organic petrochemical compounds. Polymers can be described as large molecules made up of simple repeating units. The word polymer is derived from the Greek words poly meaning "many" and mer meaning "part". Many types of polymers can be created by varying the molecular composition of the repeating unit. Being organically-based, polymers are therefore subject to degradation and breakdown through natural oxidisation. Degradation may be initiated or accelerated by numerous factors including ultraviolet light, visible light, ozone, pollutants, manufacturing impurities, oxygen, and heat. During degradation, oxidisation can result in the breaking and rearranging of chemical bonds along the polymer chain. This can begin even during the manufacturing process, due to the conditions of extreme heat or pressure that may be used to form the polymer. To delay the onset of degradation as long as possible, both process stabilisers and long-term stabilisers are added to the polymer. The most important primary anti-oxidants used for long-term stabilisation are the sterically hindered phenols. Unfortunately, these exhibit an undesirable side effect when exposed to ultraviolet radiation. They develop deeply coloured molecular structures resulting in irreversible yellowing of the plastic. To minimise this effect, polymers are also provided with an ultra-violet stabilisation package. This package is often made up of ultraviolet absorbers (UVA) and hindered amine light stabilisers (HALS). UVAs protect physically through molecular absorption of the high-energy fractions of sunlight. The absorption transforms the molecule into an excited state, and when it collapses back to its original state, the absorbed energy is released as a thermal emission (heat). In contrast, HALS protect chemically by combining with oxygen when exposed to sunlight to form stable nitroxide radicals. These trap the oxidising free radicals released when the polymer is exposed to ultraviolet radiation. Eventually, the stabilisers are either consumed or migrate to the surface of the polymer where they are abraded away. The polymer has then lost its protection and deterioration proceeds rapidly when exposed to the factors mentioned above. In theory, after-market protectorant products provide a coating to replace or supplement the original UVAs or HALS in the polymer. They cannot, however, reverse any yellowing which is the result of degradation of the sterically hindered phenols within the polymer itself.
