CS269341B1 - The guide rails are welded at the end of the wound. To each of the guide rails, an additional arm is welded, with the ends of the additional wounds connected by a connecting reinforcement bar. The reinforcement strut is provided with an adjusting screw at one or both ends. - Google Patents

Abstract

The solution falls into the field of epoxy resins and their raw materials. It solves the technical problem of utilizing difficult waste, which is generated under non-standard conditions of continuous condensation of acetone with a molar excess of phenol or forms a refining residue during refining as a modifier of low-molecular epoxy resins, to accelerate the reaction of epoxy groups with aliphatic polyamines and increase the toughness of the cured material.

Description

The present invention relates to the use of mono-, dl- and triphenols which are formed under non-standard conditions of continuous condensation of acetone and a polar excess of phenol and do not form a refining residue as a modifier of noso-molecular palm epoxy resins during dian refining.

In the continuous condensation of acetone and phenol at a molar ratio of 1: 6 to 10. The liquid product is thermoetable and sensitive to the presence of oxygen. At the start of production after technological and non-technological interruptions, the first parts tend to be darker and chemically inconsistent with a lower proportion of the β-isomer of the palm. It considers the presence of up to 30 by-products, the products of side reactions. These are palm isomers, trinuclear phenolic derivative BPX, isopropenylphenol and its dimer, monofunctional coder, isopropylphenol, condensation products of cresol and acetone, resinous phenolic polycondensates, etc. quality of produced epoxies and polycarbonates. Analytical procedures have not yet been developed to determine the full composition of the condensates, and the mechanism of all ongoing reactions is not known. Condensate does not always have the same composition. It usually becomes a waste and an environmental problem.

Diane refining is usually by crystallization of dian from various solvent systems or by crystallization of the dian-phenol starting material or by vacuum distillation. Substances undesirable in dian for the preparation of epoxy resins are concentrated in the refining residues. According to the state of the art, refining residues find little use as a raw material for the production of isopropenylphenol. I mostly liquidate it by incineration, because no other more efficient use is known. Condensation with epichlorohydrin on epoxy resin water to difficult to reproduce and high viscosity resins.

We have now found that the mixture of phenols in question dissolves well in low molecular weight epoxy resins with an average molecular weight of 340 to 450. This allows the use of a mixture of monols and triphenols with a phenolic hydroxyl content of 0.70 to 0.93 and preferably 0.85 to 0.87 mol / 100 g falling off under non-standard conditions of condensation of acetone with phenol or forming a refining residue during the refining of dian as a precipitator accelerating the reaction of epoxy groups and aliphatic polyceles and increasing the toughness of the obtained mass.

Up to 18 parts of the mixture can be dissolved in 100 parts by weight of dian spsxide resin. Looked to increase the viscosity is best! range 3 to 7 parts. Dissolution is faster using a temperature of 80 to 100 ° C and stirring. If the processing requires a lower viscosity, for example for filling, some common reactive and non-reactive solvent for epoxy resins can be added.

The benefit of using the invention is the efficient use of difficult process waste for user-friendly modifications of conventional epoxy resins. Mixtures of the same or close composition are created! also in refining by crystallization of dian from various solvent systems or by cryatization of the dienephenol addition compound or distillation under high vacuum. In all cases, the undesired substances are concentrated in the refining residue of the dian. . %. It contains about 30 substances of phenolic character. The p, p'-isomer of diane (aei 50 to 90%), the o, p'- and ο, ο'-isomers of diane (about 1 to 15%) and a number of by-products such as codimer, BPX, phenol, creeol, isopropylphenol, isopropenylphenol and its dimer. Preferably, the ee is treated as a melt dissolved with stirring in epoxy resins.

Reactive and non-reactive solvents are usually aliphatic epoxy resins and

Glycidyl ethers, glycidyl esters, glycidylamines, maleates, acrylates, phthalates, polyglycolyl xylene, styrene, benzyl alcohol and others.

Examples of aliphatic polyamines whose reaction with the epoxide group is accelerated are diethylenetriamine, triethylenetotramine, tetraethylenepentamine and dipropylene. . min, trimethylhexamethylenediamine, their adducts, for example with allyl glycidyl ether and morphiquettes. They are used in amounts corresponding to 90 to 150% of theory with respect to the epoxy content. > · Groups. In the case of the use of esters of elf, beta-unsaturated carboxylic acids, as internal plasticizers, it is necessary to increase the amount of amine by a proportion corresponding to the content of double bonds.

Example 1

Phenol statues have an approximate composition in% by weight: phenol 1, p, p'-dian 87, o, p'-dian 3, BPX 2, dimers of isopropenylphenol 6 and the sum of isopropyl and isopropenyl phenols 1, phenolic group content 0.869 mol Dissolving 50 g of a phenol mixture in 950 g of a low molecular weight 392 low molecular weight palm epoxy resin with a viscosity of 15.6 Pa.s / 25 ° C gives a clear resin with a viscosity of 20.8 Pa.s. Homogenization of 150 g of the obtained resin with 15.4 g of dlethylenetriamine at 23 DEG C. produces a clear liquid which has a temperature of 32 DEG C. after 5 minutes. minutes only temperature 27 ° C · The obtained masses have a tensile strength of 40 MPa and an elongation of 7%, 46 MPa and 3%, respectively. Such a product characterizing the toughness is 280 MPa.%, Reap. 138 MPa.%.

Example 2

Addition of 17 g of dibutyl maleate to 170 g of the modified epoxy resin from Example 1 ee gives an epoxy resin with a viscosity of 3.6 Pa.s. If trimethylhexamethylenediamine (48 g) is used, ground temperature is raised to 38 [deg.] C. in 5 minutes.

Example 3

The mixture of phenols had an approximate composition in% by weight: phenol 0,1, p, p'-dlan 76, o, p'-dian 10, BPX 5, dimers of Isopropenylphenol 6 with the sum of isopropyl and Isopropenyl-phenols 3, circulation of phenolic groups 0,864 mol / 100 g. Dissolving 211 g of a mixture of phenols in 1900 g of a low molecular weight low molecular weight epoxy resin with a viscosity of 19.4 Pa * s gives a clear resin with a viscosity of 34.7 Pa.s / 25 ° C · Mass formed by curing the homogenized composition of 160 g of the prepared resin and 16 g of diethylenetriamine, after 28 days it has a tensile strength of 17 MPa and an elongation of 6%. After thermo-oxidative aging (4 days, 125 ° C), a tensile strength of 13 MPa, an elongation of 3% and a weight loss of 0.39% were found.

Claims (1)

OBJECT OF THE INVENTION The use of a mixture of mono-, dl- s triphenols with a phenolic hydroxyl group content of 0.70 to 0.93, and preferably 0.85 to 0.87 mol / 100 g, which results in the continuous condensation of acetone with phenol under non-standard conditions or forms a refinery during the refining of dian. the remainder as an epoxy modifier and reaction accelerator, a group of aliphatic polyamines of epoxy resins having an average molecular weight of 340 to 450.