CS201556B1 - Universal dispersive adhesive - Google Patents

Description

The invention relates to a universal dispersion adhesive and solves the problem of adhesive composition with improved rheological properties for application and with increased frost resistance.

Dispersion adhesives represent a new type of adhesives whose advantages are limited flammability and reduced pollution of workplaces and air by solvent vapors. They are based on the use of film-forming properties of polymers of vinyl and acrylic monomers. In addition to the advantages of dispersion adhesives, they also have some drawbacks: adhesives need to be protected against frost and cannot be frosted. In addition, the limited stability of the dispersion does not permit the formation of adhesives having a wide choice of theological characteristics, and it is customary to formulate individual adhesives according to the intended thickness of the adhesive layer when applied. Therefore, it is necessary to produce a number of dispersion adhesives having a narrow range of applications.

The universal dispersion adhesive according to the invention, which comprises 10 to 35% by weight of a dispersion of acrylate polymers and / or copolymers of acrylates with vinyl acetate, based on dry matter, 0.3 to 3% by weight of polyvinyl butyral, It has 69% of 98% of aceiacal groups and 18-27% of alcoholic groups in the form of a solution

6.5 to 50 times the aliphatic and / or aromatic alcohols and / or glycol ethers, which may be replaced up to half by glycol from the group of ethylene glycol, diethylene glycol, propylene glycol and glycerin and from 5 to 50% by weight of limestone, dolomite, chalk fillers , kaolin, feldspar, weed, talc and slate.

The universal dispersion adhesive according to the invention has a reduced minimum film-forming temperature and consequently increased frost resistance. Further, by optimizing the filler component, it has good theological properties and can be applied in a very thin layer, exhibits a higher shear strength of the layer and has a certain resistance to water action.

Ethanol, propanol, diacetone alcohol and aromatic benzyl alcohol are used as aliphatic alcohols for the production of the universal dispersion adhesive.

The invention is illustrated by the following non-limiting examples:

Example 1

The universal dispersion adhesive was prepared by dispersing 500 kg of homopolymer polyvinyl acetate dispersion with 52% dry matter, softened 20% dibutyl phthalate with 70 kg of a 10% polyvinyl butyral solution containing 69% acetal and 27% alcohol groups in a 1: 1 mixture of n-butanol and ethylene glycol. 300 kg ground limestone and 30 kg kaolin, 3 kg alkyl tin oxide fungicide and 97 kg water. The prepared adhesive was subjected to cycles with cooling to -5 ° C both alone and in the adhesive layer. It has been shown that the cycles withstood the adhesive without changing the spreadability and the adhesive layer without any effect. The adhesive layer then withstood several cycles with cooling down to -20 ° C without substantially altering its properties.

Example 2

Dispersion adhesive was prepared by dispersing 250 kg of a copolymer dispersion of vinyl acetate with 25% 2-ethylhexyl acrylate with 50% dry matter, 196 kg of a 14% solution of polyvinyl butyral (70% acetal and 25% alcohol groups) in ethylene glycol ethyl ether, 300 kg barite, 150 kg ground feldspar. 30 kg of talc, 2 kg of phenylmercurate-based fungicide and 72 kg of water The adhesive had the same properties as the adhesive described in Example 1.

Example 3

The dispersion adhesive was prepared from 500 kg of a 50% dispersion of polyvinyl acetate with 20% butyl acrylate, 100 kg of 10% polyvinyl acetate solution.

Claims (1)

Universal dispersion adhesive based on dispersions of vinyl acetate and acrylate polymers or their copolymers, fillers and additives, characterized in that it contains 10 to 35% by weight of acrylate polymer and / or acrylate copolymer / vinyl acetate dispersion, based on dry matter, 0.3 to 3% by weight of polyvinyl butyral having 69 to 78% acetal groups and 18 to 27% alcoholic nylbutyral (78% acetal and 18% alcoholic groups) in a 1: 1 mixture of diacetone alcohol with propylene glycol, 4 kg of pentachlorophenol fungicide, 200 kg of ground shale and 196 kg of chalk. The adhesive resisted well in the frost test. Example 4 The dispersion adhesive was prepared by dispersing 650 kg acrylic ester dispersion with 50% dry matter with 160 kg 12% polyvinyl butyral solution (77% acetal and 19% alcohol groups) dissolved in a 1: 1 mixture of benzyl alcohol, amyl alcohol, ethylene glycol butyl ether and glycerin. 1 with the addition of 1.5 kg of benzylchlorophenol, 100 kg of ground dolomite, 50 kg of chalk and 40 kg of talc. The general purpose dispersion adhesive according to the invention is intended for bonding all conventional rigid adherents when sheared. It is primarily intended for bonding ceramic, wood and plastic tiles to plaster, concrete and wood, for bonding mosaic parquet to concrete, for bonding expanded polystyrene panels to ceilings of plaster and concrete. INVENTION groups in the form of a solution in 6.5 to 50 times the aliphatic and / or aromatic alcohols and / or glycol ethers, which may be replaced up to half by glycol from the group of ethylene glycol, diethylene glycol, propylene glycol and glycerin and 5 to 50% by weight fillers from the group of limestone, dolomite, chalk, kaolin, feldspar, weed, talc and slate.