摘要:
Aqueous non-self-emulsifying polymer dispersions having small particles and a long shelf life and based on highly viscous reaction resins are prepared without the addition of solvents, by means of an intensively dispersing screw apparatus, by a continuous process in which the preparation of the polymer dispersion is carried out in an intensive shear zone of the screw apparatus, the water/reaction resin ratio in this intensive shear zone corresponding to the phase inversion point or being close to it, and the specific energy supply is 0.01-0.15 kWh/kg, the residence time is 0.1-60 sec and the shear gradient is 2,000-20,000 sec.sup.-1.
摘要翻译:通过连续的方法,通过连续方法制备具有小颗粒和长保质期并且基于高粘度反应树脂的水性非自乳化聚合物分散体,而不通过浓缩分散螺杆装置添加溶剂,其中制备 聚合物分散体在螺旋装置的强剪切区域中进行,该强化剪切区域中的水/反应树脂比率对应于相转化点或接近相转变点,比能量供应量为0.01-0.15kWh / kg ,停留时间为0.1-60秒,剪切梯度为2,000-20,000秒-1。
摘要:
Shear forces are used for essentially salt-free coagulation of plastics dispersions or rubber dispersions. For this, method of use is made of an apparatus with at least one shearing module which has a stator and a rotor arranged within the stator, where the surfaces facing toward one another in the stator and in the rotor are in each case smooth, or at least the rotor exhibits a structure formed on its surface and facing from this in the direction of the stator, and between the stator and the rotor there is a gap of predetermined gap width. The process is carried out by passing the dispersion to be coagulated through the gap between stator and rotor and precipitating the dispersion by rotation of the rotor with predetermined shear rate and shear deformation.
摘要:
1-Hydroxyanthraquinones are prepared in an improved process by reacting phthalic anhydride or derivatives thereof with phenol derivatives in the presence of a Lewis acid as catalyst and in the presence or absence of a diluent, wherein the improvement comprises conducting the reaction in a self-cleaning apparatus having a mixing effect, at a temperature of from 120.degree. C. to 300.degree. C. for from 5 to 1,000 seconds, the self-cleaning apparatus having a mixing effect subjecting the reactants to a shear gradient of from 50 to 20,000 sec.sup.-1 with an energy input of from 0.01 to 0.2 kwh/kg of reactants.
摘要:
Semi-finished GMT sheet material of GMT recyclate in which more than 50% by weight of the glass fibers are more than 2 mm in length and which is produced by extruding GMT recyclate particles without significant comminution of the glass fibers.
摘要:
Crude copper phthalocyanines are transformed into a pigmentary state by treating finely divided but imperfectly crystallized and highly aggregated crude copper phthalocyanines having a primary particle size, produced by ball milling, or less than 0.1 .mu.m with an organic solvent by subjecting a suspension of the organic solvent and the milled crude copper phthalocyanine (hereinafter referred to as the solvent/pigment suspension), which has a pigment concentration of from 15 to 55% by weight and a solvent concentration of from 15 to 85% by weight and which may contain water in a concentration of from 0 to 30% by weight, to a shear gradient of from 1000 to 20000 s.sup.-1 for a period of from 2 to 1000 s with an energy uptake during shearing of from 0.01 to 0.02 kWh/kg of pigment throughput, then metering water into the solvent/pigment suspension in an amount of from 0.1 to 10 times the amount of the solvent, to effect a defined discontinuation of the conditioning process, and finally mixing the suspension until homogeneous.