US 5,795,104 A · Waterglass-based material for sealing purposes and processes for hardening waterglass materials

Abstract

A waterglass-based material containing an inorganic component A of an alkali metal silicate having a low viscosity and a high silica content and a component B having at least one fast hardening agent, preferably carbonic esters, and a hardening retarder of at least one further hardening agent which acts more slowly, preferably dialkyl carboxylates, in particular dimethyl succinate, dimethyl glutarate and/or dimethyl adipate. The material may also contain optional further additives, such as liquefiers, thixotropic agents, lubricants and fillers and the like. Processes for hardening a waterglass-based material and use of such a material for sealing pipelines, sewers and containers, for soil stabilization, coating and impregnation of materials and for the production of shaped articles are also indicated.

Claims41

Dependent claims

A waterglass-based material comprising components A and B and optionally further additives, wherein:

a) component A comprises alkali silicate waterglass having an SiO.sub.2 :alkali metal silicate molar ratio of 2.1-4;
and
b) component B comprises at least one fast-acting hardening agent selected from the group consisting of esters, lactones, lactams, inorganic or organic acids, anhydrides, nitrites, amides and acid chlorides, and additionally,
as a hardening retarder, at least one other hardening agent which acts more slowly than the fast-acting hardening agent and is selected from the group consisting of butylene carbonate and a mixture of different dialkyl carboxylates selected from the group consisting of dimethyl succinate, dimethyl glutarate and dimethyl adipate;
wherein the waterglass-based material has a total water content of 10-60% by weight, and wherein the waterglass-based material has a silica content of 7-42% by weight.

2 more elements

A process for the preparation and hardening of a waterglass-based material, wherein

a) waterglass having an SiO.sub.2 :alkali metal oxide molar ratio of from 2.1 to 4 and a viscosity (at 20.degree. C.) of 20-100 mPa.s is initially provided as component A, and
b) then component B is added which comprises at least one fast-acting hardening agent selected from the group consisting of esters, lactones, lactams, inorganic or organic acids, anhydrides, nitrites, amides and acid chlorides,
and at least one other hardening agent as a hardening retarder which acts more slowly that the fast-acting hardening agent and is selected from the group consisting of butylene carbonate and a mixture of different dialkyl carboxylates selected from the group consisting of dimethyl succinate, dimethyl glutarate and dimethyl adipate,
so that a total water content of 10-60% by weight and a silica content of 7-42% by weight result and the material gels spontaneously within a reaction time (pot life) typical of the composition of the material and the chosen reaction conditions, and hardens.

1 more element

Dependencies are inferred from the claim text.

Waterglass-based material for sealing purposes and processes for hardening waterglass materials

Life of this patent

Waterglass-based material for sealing purposes and processes for hardening waterglass materials

Life of this patent

Abstract

Claims41