Pulverulent polycondensation products

A polycondensation product, powdery technology, applied in the field of powder polycondensation products, can solve the problems of the influence of polymer activity, failure to achieve high degree of polymerization, high cost, etc.

Inactive Publication Date: 2008-12-17
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are, on the one hand, the high cost of amino-functionalized polyalkylene oxides and, on the other hand, the inability to achieve high degrees of polymerization, which has a negative effect on the reactivity of the resulting polymers compared to the aforementioned polycarboxylates. have a negative impact
[0011] The disadvantage of this condensation product lies only in the fact that the corresponding polycondensation product is produced in the form of an aqueous solution with a solids content of about 30% by weight, for which storage, especially in temperate climate zones, requires special measures for its stabilization

Method used

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  • Pulverulent polycondensation products
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  • Pulverulent polycondensation products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A-1

[0046] 1mol of poly(ethylene oxide) monophenyl ether (2000g / mol), 1mol of phenoxyethanol phosphate (or 2-phenoxyethanol dihydrogen phosphate and 2-phenoxyethanol hydrogen phosphate mixture), 0.6mol water and 2mol concentrated H 2 SO 4 Add with stirring. To the solution thus formed was added dropwise 2 mol of formaldehyde in the form of a 37% aqueous solution. The polycondensation reaction was completed at 105°C over a period of 5 hours. After the reaction, without pre-neutralization, basic alumina (particle size 0.05-0.15mm) was slowly stirred into the liquid polymer melt at about 80°C until a soft powder was formed. The amount of aluminum oxide was selected such that the proportion of the polycondensation product on the support was 10% by weight.

Embodiment A-2

[0048] 1mol of poly(ethylene oxide) monophenyl ether (2000g / mol), 1mol of phenoxyethanol phosphate (or 2-phenoxyethanol dihydrogen phosphate and 2-phenoxyethanol hydrogen phosphate mixture), 0.6mol water and 2mol concentrated H 2 SO 4 Mix under stirring. To the solution thus formed was added dropwise 2 mol of formaldehyde in the form of a 37% aqueous solution. The polycondensation reaction was completed at 105°C over a period of 5 hours. After the reaction, without pre-neutralization, basic alumina (particle size 0.05-0.15mm) was slowly stirred into the liquid polymer melt at about 80°C until a soft powder was formed. The amount of aluminum oxide was selected such that the proportion of the polycondensation product on the support was 20% by weight.

Embodiment A-3

[0050] 1mol of poly(ethylene oxide) monophenyl ether (2000g / mol), 1mol of phenoxyethanol phosphate (or 2-phenoxyethanol dihydrogen phosphate and 2-phenoxyethanol hydrogen phosphate mixture), 0.6mol water and 2mol concentrated H 2 SO 4 Mix under stirring. To the solution thus formed was added dropwise 2 mol of formaldehyde in the form of a 37% aqueous solution. The polycondensation reaction was completed at 105°C over a period of 5 hours. After the reaction, without prior neutralization, slowly stir Sipernat into the liquid polymer melt at about 80 °C (precipitated silicic acid, the average particle diameter is 15μm, and the specific surface area is 50m 2 / g), until a soft powder is formed. Select Sipernat like this The amount is such that the share of the polycondensation product on the support is 30% by weight.

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Abstract

Pulverulent polycondensation products are described, comprising a) from 5 to 95% by weight of a polycondensation product based on an aromatic or heteroaromatic compound (A) having from 5 to 10 carbon atoms or heteroatoms having at least one oxyethylene or oxypropylene radical and an aldehyde (C) selected from the group of formaldehyde, glyoxylic acid and benzaldehyde or mixtures thereof, and b) from 5 to 95% by weight of a finely divided mineral support material having a specific surface area of from 0.5 to 500 m<2> / g (according to BET to DIN 66 131). The inventive pulverulent polycondensation products are outstandingly suitable in building material mixtures in an amount of from 0.1 to 5% by weight, based on the weight of the building material.; The pulverulent polycondensation products have a number of advantages in this context, for example excellent storage stability, good liquefying action at low dosage and technically simple production.

Description

technical field [0001] The invention relates to pulverulent polycondensation products based on aromatic or heteroaromatic compounds, a process for their preparation and their use as additives for building material mixtures. Background technique [0002] In powdered inorganic or organic substances such as hydraulic binders (e.g. cement, lime, gypsum or anhydrite), ore powder, silicate powder, chalk, clay, porcelain deposits, talc, pigments, carbon black or plastic powder Additives in the form of dispersants are often added to aqueous suspensions in order to improve their processability, ie kneadability, fluidity, sprayability, brushability or pumpability. These additives are able to break up agglomerates and disperse the formed particles by adsorbing on the surface of the particles. Especially in the case of highly concentrated dispersions, this leads to a marked improvement in processability. [0003] This effect can be exploited particularly advantageously when preparing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/30C08J3/12C08K3/22C08K3/36C08L61/14C04B103/30
CPCC04B24/166C04B24/246C04B24/30C04B35/63476C04B35/63488C04B40/0042C04B2235/3217C04B2235/3418C04B2235/5409C04B2235/5436Y02W30/91C04B7/00C04B14/02C04B16/06C04B40/0028C04B18/24C08L61/14C08K3/22C08J3/12
Inventor P·威兰A·克劳斯G·阿尔布雷希特H·格拉斯尔K·贝歇尔
Owner CONSTR RES & TECH GMBH
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