摘要:
The present invention provides a thermostable polymer comprisinga) 16 to 67 mole % of structural components of the formula: ##STR1## b) 5 to 42 mole % of structural components of the formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3, independently of one another, are hydrogen atoms or methyl radicals, as well as c) 16 to 46 mole % of structural components of the formula: ##STR3## wherein R.sup.4 is a hydrogen atom or a methyl radical. The present invention also provides a process for the production of these polymers which, because of their high temperature stability, are outstandingly useful as retention agents for aqueous systems and as fluid loss additives.
摘要:
Stabilized, water-soluble polymer powders based on polyoxyalkylene glycol carboxylates are described, wherein the powders comprise from 0.01 to 10% by weight of a stabilizer selected from the group consisting of phenols, amines, phosphites, thioethers, and also thioacids, and where the stabilizer was added in liquid or dissolved form to the aqueous polymer solution prior to its conversion into the powder form. The polymer powders thus protected against autoignition and oxidative degradation have unexpectedly high thermooxidative stability, even on exposure to high temperatures and oxidizing action (air, oxygen).
摘要:
A process for the production of sulphonic acid group-containing condensation products based on amino-s-triazines with at least two amino groups and formaldehyde with a low content of free formaldehyde, whereina) an amino-s-triazine, formaldehyde and sulphite is condensed in a mole ratio of 1:1.3 to 6:0.3 to 1.5 in aqueous solution at a pH value of 9.0 to 12.0 and at a temperature of 50.degree. to 90.degree. C. until sulphite is no longer detectable.b) subsequently, further condensation is carried out at a pH value of 2.0 to 7.0 and at a temperature of 50.degree. to 90.degree. C. until the viscosity of the solution is 4 to 1000 mm.sup.2 /s at 80.degree. C. andc) thereafter the condensation product is subjected to an after-treatment in a strongly alkaline range of pH.sqroot.11.0 and at an elevated temperature.
摘要:
Disclosed is a flow improving agent for binder suspensions containing cement which is composed of a) amino-s-triazine-formaldehyde-sulfite condensation products having a molar ratio of amino-s-triazine:formaldehyde:sulfite of 1:1.3 to 6.0: 0.3 to 1.5 and a low content of free formaldehye as well as b) casein. The flow improving agents have the advantage that the flowability is considerably improved compared to casein (alone) for example and the increased flowability remains constant even over a longer time period.
摘要:
In the proposed condensation product based on amino-s-triazines with at least two amino groups, formaldehyde and sulphite, the molar ratio of amino-s-triazine, formaldehyde and sulphite is 1:2.5-6.0:1.51-2.0 and the formiate content is less than 0.3 wt %. The condensation product is obtained by a) heating amino-s-triazine, formaldehyde and a sulphite in the molar ratio 1:2.5-6.0:1.51-2.0 in an aqueous solution at a temperature of 60-90° C. and a pH level of between 9.0 and 13.0 until the sulphite can no longer be detected; b) continuing the condensation at a pH level of between 3.0 and 6.5 and a temperature of 60-80° C. until the condensation product has a viscosity of 5-50 mm/s at 80° C.; and c) adjusting the pH level of the condensation product to 7.5-12.0 or carrying out thermal secondary treatment at a pH level of >10.0 and a temperature of 60-100° C. The product can be used as an additive for inorganic binders such as cement.
摘要:
Flow improving agents for binder suspensions containing cement are described, which consist of:a) Graft polymers which have been prepared by radical grafting of a polyalkylene oxide of the general formula (I) with an ethylenically unsaturated mono- or dicarboxylic acid or the anhydride thereof, and then by derivatizing with a primary or secondary amine and/or alcohol, and also ofb) Casein.These flow improving agents have the advantage that the ability to flow is considerably improved in comparison, for example, with casein alone, and the improved ability to flow is preserved over a longer period of time.
摘要:
Water-soluble graft polymers are described which have been produced by a) radical grafting of a polyalkylene oxide of the general formula I ##STR1## in which R.sup.1 =--H, --C.sub.n H.sub.2n+1, --C.sub.6 H.sub.4 --C.sub.n H.sub.2n+1, ##STR2## --(CH--R.sup.2).sub.m NHR.sup.2, --(CH--R.sup.2).sub.m OH, --(CH--R.sup.2).sub.m --COOH, --CO--R.sup.5 R.sup.2 =--H, --CH.sub.3, --C.sub.2 H.sub.5 R.sup.3 =--H, --C.sub.n H.sub.2n+1, --C.sub.m H.sub.2m --SO.sub.3 Na, --(CH--R.sup.2).sub.m NHR.sup.2, --(CH--R.sup.2).sub.m OH, --(CH--R.sup.2).sub.m --COOH, --CO--R.sup.5 R.sup.4 =--H, --(CH--R.sup.2).sub.m --COOH, --CO--R.sup.5 R.sup.5 =--C.sub.m H.sub.2m+1, --C.sub.6 H.sub.5, --(CH--R.sup.2).sub.m --COOH, --C.sub.6 H.sub.4 --COOH n denotes 1-18, m denotes 1-5, x denotes 2-200, y denotes 0 or 1 with an ethylenically unsaturated mono or dicarboxylic acid or their anhydride and subsequently b) derivatising with a primary or secondary amine and/or alcohol. These graft polymers are suitable as dispersants for inorganic binding agents containing water such as e.g. cement, gypsum, anhydrite.
摘要:
The use of cyclohexanepolycarboxylic acid derivatives for reducing or minimizing the dust emission when handling pulverulent construction chemistry products, processes for the preparation of the pulverulent construction chemistry products and hydraulically setting materials containing the cyclohexanepolycarboxylic acid derivatives according to the invention are proposed.
摘要:
A description is given of a solvent-free polyurethane dispersion having a high solids content of polyurethane polymer or fillers, which is obtainable by a) allowing a relatively high molecular weight polyol component (A) (i) and, if desired, a low molecular weight polyol component (A) (ii) to react with a polyisocyanate component (B) in the presence or absence of a catalyst to give a polyurethane preadduct, then b) reacting the polyurethane preadduct from step a) with a low molecular weight and anionically modifiable polyol component (A) (iii) containing two or more hydroxyl groups and one or more carboxyl groups to give the corresponding prepolymer, c) allowing the prepolymer from step b) to react with a neutralization component (C) until the carboxyl groups have been completely or partially neutralized, subsequently or simultaneously d) dispersing the neutralized prepolymer from step c) in water which may further comprise a formulation component (F) comprising fillers, pigments, plasticizers, fibrous materials and other customary additives, subsequently e) reacting the dispersion from step d) with a chain extension component (D), and f) if desired, allowing the dispersion from step e) to react with a chain stopper component (E). The polyurethane dispersion of the invention has an ideal linear segmented structure due to its method of preparation and has extraordinarily high solids contents combined with comparatively low viscosities, complete freedom from solvents, excellent materials properties (e.g. elasticity, elongation and tensile strength) and is prepared by a technically simple process.
摘要:
Described is a polyurethane/polymer hybrid dispersion with high film hardness, which comprises the reaction components (A) from 3 to 25% by weight of a polyol component consisting of (i) from 2 to 20% by weight of a relatively high molecular mass polyol component, (ii) from 0.5 to 5% by weight of a low molecular mass polyol component, (iii) from 0.5 to 3% by weight of a low molecular mass and anionically modifiable polyol component, (B) from 2 to 20% by weight of a polyisocyanate component, (C) if desired, from 0 to 6% by weight of a solvent component consisting of (i) at least one polyisocyanate-inert organic solvent and/or (ii) a polyisocyanate-inert reactive diluent, (D) from 0.15 to 1.5% by weight of a neutralizing component, (E) from 0.1 to 1% by weight of a chain extender component, (F) from 5 to 40% by weight of a monomer component, (G) from 0.01 to 1.5% by weight of an initiator component, and water as the remainder. The advantages of the polyurethane/polymer hybrid dispersion of the invention, such as high hardness coupled with high flexibility of the crack-free films, good chemical resistance, great stability of the dispersion within a wide pH range, good freeze/thaw stability, and the use of inexpensive raw materials, are achieved in a simplified synthesis route, without subsequence chemical crosslinking, with a simultaneously low organic solvent content (≦4% by weight), and with good filming at temperatures ≦+10° C.