Pigmented plastic powder

This paper examines the structures that occur in rotomolded polyethylene and polypropylene produced under a wide range of processing conditions. The effects of pigments are investigated as well as the mechanical and thermal processes that plastic powders typically undergo during preparation for rotomolding. In all cases, the mechanical properties of the molded articles have been related to the microstructure. 

N,N-Dimethyl-N-tallow-N-(3-sulfopropyl)-ammonium betaine N,N-Distearyl-N-methyl-N-(3-sulfopropyl)-ammonium betaine surfactant, phytopharmaceuticals PEG-17 castor oil PEG-32 castor oil surfactant, pigment dispersions Disodium decyl diphenyl ether disulfonate PEG-2 cocomonium nitrate surfactant, pigments cosmetic powders C9-15 fluoroalcohol phosphate surfactant, pigments cosmetics Octyltriethoxysilane surfactant, plastic lubricants PEG-32 castor oil PEG-75 castor oil PEG-160 castor oil... 

The "Centroid Color Charts" (see NBS Special Publication 440) have been usefully applied to the textile and other industries. Special standardized illumination and viewing conditions must be employed for accurate matching of samples to the Centroid Color Charts. For viewing clear colored solutions, special apparatus is required. It is obvious from the context and discussion that almost all of the commercial application has been limited to opaque surface pigments (textiles, plastics, powders, metallic surfaces, etc.) and almost none to clear solutions. There are special problems in comparative color designations for opaque and clear samples, such as the following ... 

Dispersed Phase Solid Solid Suspension (pigmented plastic) Suspension (paint, toothpaste) Dry Powder (dust, flour)... 

Pigments are available ia a number of commercial forms including dry powders (either surface treated or untreated), presscakes, flushed colors (thick pastes), fluidi2ed dispersions (pourable pastes), resia predispersed pigments (powders), and plastic color concentrates or master batches (granules) (see PiGLffiNTDISPERSIONS). 

Adhesives. Poly(vinyl alcohol) is used as a component in a wide variety of general-purpose adhesives to bond ceUulosic materials, such as paper and paperboard, wood textiles, some metal foils, and porous ceramic surfaces, to each other. It is also an effective binder for pigments and other finely divided powders. Both fully and partially hydrolyzed grades are used. Sensitivity to water increases with decreasing degree of hydrolysis and the addition of plasticizer. Poly(vinyl alcohol) in many appHcations is employed as an additive to other polymer systems to improve the cohesive strength, film flexibiUty, moisture resistance, and other properties. It is incorporated into a wide variety of adhesives through its use as a protective coUoid in emulsion p olymerization. 

Dry-Blending. Most plasticized PVC powders are prepared by a dry-blend process in which the plasticizers, stabilizers, pigments, and additives are absorbed on the porous PVC particles at elevated temperatures while they are being agitated in a high speed mixer. Thermosetting powders are almost never prepared by this process. 

Cobalt(II) phosphate octahydrate [10294-50-5], Co2(P0272 8H20, is a red to purple amorphous powder. The product is obtained by reaction of an alkaline phosphate and solutions of cobalt salts. The material is insoluble in water or alkaU, but dissolves in mineral acids. The phosphate is used in glazes, enamels, pigments (qv) and plastic resins, and in certain steel (qv) phosphating operations (see Enamels,PORCELAIN ORVITREOUS). 

Moreover, y-P.V.19 is also found in a variety of other media, such as powder coatings and cast resins. This includes systems based on unsaturated polyester resins whose hardening is not affected by the pigment. The list of application media includes plastics which are processed at very high temperature (such as polycarbonates), in which the pigment is thermally stable up to 320°C. PUR foams and... 

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