CS238697B1 - Activated powder fertilizer - Google Patents

Abstract

Activated putty filler powder which can be cured even at temperatures Low: 15 ° C. The objective of the invention is achieved by activated powdered filler of two-component sealants, containing powder as one component filler and as a second component by air inhibited acrylate composition or not a saturated polyester resin with addition Peroxide Initiator, Essential of the invention is that the powder filler is activated accelerator which is the product of the reaction 2,2-dipyridyl and / or phenanthroline and / or derivatives thereof with a cobalt salt and inorganic and / or monobasic organic acid in an organic solvent environment and / or water. Putty according to the invention it is possible to cure 1 at temperatures below 0 C v

Description

The invention relates to an activated powder filler of two-component sealants for use at low temperatures, one component of which is a powdered filler and the other component is an air-inhibited acrylic composition or unsaturated polyester resin with the addition of organic hydroperoxide or hydrogen peroxide.

The air-inhibited acrylate composition or unsaturated polyester resin can be used in combination with inorganic (eg silica quartz, silica gel, powdered aluminum, iron, aluminum oxide, ground slate, etc.) and organic (eg powdered PVC and other) fillers, preferably as sealants for a variety of purposes.

Such compositions cure to a solid mass similarly to the resin itself by free-radical polymerization or copolymerization. Free reactive radicals are required to initiate polymerization and are obtained by the decomposition of suitable initiators, most often organic peroxides. However, in order for this reaction to proceed sufficiently quickly even at ambient temperature, it is necessary to add a suitable accelerator. They are usually substances with reducing properties. The most commonly used accelerators are salts of some metals, especially cobalt (but also vanadium or manganese) or tertiary aromatic amines. However, it is also possible to use quaternary ammonium salts, dienols, organic amines and a number of organic sulfur-containing compounds (e.g. mercaptans or thiourea derivatives).

However, the use of these accelerators b with suitable organic peroxides usually requires a temperature of at least 20 ° C, only curing of the diacyl peroxides with the use of a tertiary aromatic amine takes place at lower temperatures. But generally below 15 ° C, curing slows down considerably or is not perfect. Similarly, curing of epoxy resins and sealants is limited by a temperature of 15 to 20 ° C. Therefore, the synthetic resin-based sealants cannot be applied at low temperatures.

These disadvantages are overcome by activated powder filler for two-component sealants suitable for use at low temperatures, one component being a powder filler and the other component an air-inhibited acrylic composition or unsaturated polyester resin with the addition of organic hydroperoxide or hydrogen peroxide according to the invention that is activated 0.02 % to 5 wt. an accelerator (based on a solvent-free accelerator) resulting from the reduction of 2,2-dipyridyl and / or its derivatives with a cobalt salt and inorganic and / or monobasic acid in an organic solvent and / or water ratio of 1 to 0 moles 2, 2'-dipyridyl and / or phenanthroline and / or derivatives thereof per mole of cobalt.

The action of this accelerator permits curing even at temperatures of 0 ° C, the polymerization reaction proceeding fast enough and with sufficient conversion. At a higher accelerator content, the reaction proceeds so quickly that at normal temperature it may not be possible to homogenize the activated filler with the resin component.

Note: for practical application, the activated powdered filler can be used in admixture with a plasticizer in the form of a paste. Other substances may also be added to modify the desired properties (eg, adhesion promoters, dyes, etc.). It is also possible to prepare acrylic component mastic, one component of which is a synthetic resin (ie an air-inhibited acrylate composition or unsaturated polyester resin with the addition of thyroperoxide or hydrogen peroxide) and an unactivated filler and the other component the same synthetic resin (hydroperoxide-free or hydrogen peroxide free) filler.

Example 1

400 g of ferrosilicon powder was activated with a solution of 1 g of 2,2 dipyridyl and 2.5 g of cobalt octoate solution containing 10 wt. of cobalt in 17 g of benzene. After drying of the solvents, 40 g of this activated filler was mixed with 10 g of air-inhibited diester of a low molecular weight epoxy resin with methacrylic acid and trimethylolpropane trimethacrylate and containing longer amounts of cumene hydroperoxide and triethylamine (CHS Aldurit M 200). Both components were allowed to reach the temperature at which they were before mixing

238597 curing was tested, and immediately after homogenization were stored in an environment of the same temperature. The time from mixing to gelation of the mixture was monitored.

At 11 ° C, gelation occurred in 20 s, at -10 ° C in 2 minutes.

Example 2

In the same way and with the same amount of accelerator, 800 g of ferrosilicon were activated.

At 11 ° C, the sealant thus prepared was gelatinized in 40 seconds, at -10 ° C in 5 minutes.

Example 3 g of 2,2 dipyridyl was dissolved in 20 g of 1.25 wt. solution of cobalt in the form of an octoate. 200 g of PVC-PVAc powder copolymers (85/15) were activated with this solution. An air-inhibited ecrylate composition on the same basis as Example 1 (Chs Aldurit S 100) was used for curing. Gelation occurred with a mixture of 20 g resin with 30 g activated filler at 11 ° C for 3 minutes, and -10 ° C for 35 minutes.

Example 4

0.5 g of phenanthroline and an equal amount of bathophenanthroline were dissolved in a solution of 0.2 g of cobalt nitrate in 10 ml of water. After evaporation of the water at 80 ° C, the solid accelerator was dissolved in 50 ml of butanol. 5 ml of this solution was activated with 100 g of PVC powder. A mixture of 20 g of the resin of Example 3 with 30 g of the filler thus prepared gelatinously at 11 ° C within 24 hours, at -10 ° C for 3 days.

Example 5

200 g of graphite powder was activated by a solution of an accelerator prepared by dissolving 0.5 g of phenanthroline in 10 ml of a 0.5% cobalt solution (as cobalt formate) in a benzene-butanol mixture. The putty was prepared from 15 g of the resin of Example 3 and 30 g of activated filler and gelled at 11 ° C in 50 minutes, at -10 ° C in 6 hours.

Example 5

2.5 g of 2,2 dipyridyl and 1.25 g of 10% cobalt (as octoet) were dissolved in a mixture of 10 g of white spirit and 5 g of benzene. 250 g of PVC-PVAc copolymers (85/15) were activated with this solution. An unsaturated polyester resin based on propylene glycol, ethylene glycol, maleic anhydride and phthalic anhydride (CHS Polaester 100) was used as the resin component with the addition of 3 wt. cumene hydroperoxide. 20 g of this resin with 30 g of activated filler gelled at 11 ° C in 5 minutes at -10 ° C in 40 minutes.

Example 7

200 g ground iron (Hametag 0.06) was activated with a mixture of 7 ml of a 1% 2,2-dipyridyl solution and 2 ml of a 1% cobalt solution (as octoate). 30 g of this filler with 10 g of the resin of Example 1 gelled at 11 ° C in 40 minutes, at -10 ° C in 6 hours.

Claims (1)

Activated powder filler for two-component sealants, suitable for use at low temperatures, one component being a powder filler and the other component an air-inhibited acrylate composition or unsaturated polyester resin with an addition of organic hydroperoxide or hydrogen peroxide, characterized in that it is activated 0.02 to 5 % wt. accelerators, based on solvent-free accelerator, resulting from the reaction of 2,2'-dipyridyl and / or phenentroline and / or their derivatives with a cobalt salt and an inorganic and / or monobasic organic acid in an organic solvent and / or water ratio of 1 up to 10 moles of 2,2'-dipyridyl and / or phenanthroline β / or their derivatives per mole of cobalt.