Coating mixtures, method of producing them and their use for coa

Details Coating mixtures, method of producing them and their use for coa Coating mixtures, method of producing them and their use for coa

1998-02-03

2000-07-11

Dawson, Robert

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524860, 524861, 524492, 524494, 525477, C08K 336

Patent

active

060874384

DESCRIPTION:

BRIEF SUMMARY
The invention relates to coating mixtures, containing in the anhydrous state at least one polysiloxane, at least one reactive inorganic filler, at least one inorganic material which is film-forming as melt and at least one reactive (oligo)silane, a process for manufacture and their use.
A multiplicity of mixtures comprising at least one polysiloxane and at least one inorganic filler, which are used in a very wide range of fields, has been known hitherto. Mixtures consisting of a polysiloxane resin as polysiloxane and a pigment as filler, so-called pigmented polysiloxane resins, are used both as lacquer systems and in coating technology. Both pigmented polysiloxane resins in organic solvents and inorganic coatings of enamel have been used hitherto as heat-resistant coatings. Pigmented polysiloxane resins only have a good property profile, however, When they are used in organic solvents. Inorganic coatings of enamel are distinguished by high heat resistance. The fact that they are brittle and only achieve their final properties by means of stoving at temperatures >400.degree. C. is, however, a disadvantage. For this reason they are easily damaged, particularly in the transport phase and until the necessary temperature has been reached, so that enamel cannot be used as a coating in many fields.
High-temperature-resistant systems have only been achieved hitherto with exclusive use of solvent-based silicone resins, optionally with the addition of silicone oils as flow control or release agents. Corresponding coatings are composed of the resin as binder, pigments, additives (catalysts, emulsifiers, flow control agents etc.) and various solvents. The current aqueous systems have disadvantages, particularly in respect of their behaviour following drying at room temperature. Unsatisfactory corrosion protection, inadequate hardness and film strength (bond strength), drying times which are too long (slurries) and insufficient storage stability are further disadvantages.
Heat-resistant coatings are chiefly used to protect objects and installations of the most varied kind, such as silencers, furnaces, petrochemical industry installations, housings for items of equipment, combustion plants etc.
Examples of the requirements which heat-resistant coatings are expected to meet are temperature resistance up to 600.degree. C. under long-term and cyclic stress, high resistance at temperature differences (.DELTA.T resistance), high bending strength, colourfastness, resistance to corrosive effects, good drying properties, good adhesion, simple manufacturing process (high storage stability) and good handle-ability and usability in the conventional processes such as spray, roller, dip or brush application.
A high-temperature-resistant corrosion protection coating is produced for example by drying at room temperature and subsequent stoving.
In mixtures for heat-resistant coatings known hitherto, it was not possible either to dispense with the use of an organic solvent, or provide a correspondingly optimized enamel or an optimal combination of polysiloxane and enamel.
The object of the invention was therefore to provide stable, low-solvent polysiloxane-based coating mixtures which are as free from organic solvents as possible, which can be used as heat-resistant coatings in particular and which are distinguished by an improved property profile compared with the prior art.
It has now been found that coating mixtures, containing in the anhydrous state compared with the prior art.
The invention thus provides coating mixtures, containing in the anhydrous state 30 wt. % of at least one polysiloxane, wt. %, most particularly preferably 2 to 10 wt. % and/or 5 to 10 wt. % of at least one reactive inorganic filler, 35 wt. %, most particularly preferably 20 to 30 wt. % of at least one inorganic material which is film-forming as melt and optionally wt. % of an unreactive filler and/or pigment or a mixture of several fillers and/or pigments 3 wt. % of at least one reactive (oligo)silane, to 0.3 wt. % of at least one catalyst and mixture of s

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