Patent GB-438162-A (GB)
Title: Process for stabilising aqueous bitumen emulsions
IPC: C08L95/00
Filed: 1934-11-20
Abstract: A condensation product stated to be used for stabilizing bituminous emulsions is prepared by reacting 100 pts. of dioxydiphenylsulphone, made from a crude phenol mixture and containing about 2 pts. combined cresols and 3 pts. of combined phenol, for 3 hours at 100--103 DEG C. with 25 pts. of 37 per cent caustic soda lye and 50 pts. of 30 per cent formaldehyde.  The product is cooled and diluted with 150 pts. of water. Specification 438,188, [Group V], is referred to.ALSO:Aqueous bituminous emulsions are stabilized by the addition to the emulsion of alkali-soluble formaldehyde condensation products derived from phenols, their substitution products and derivatives. The condensation products must be readily soluble in water of neutral to feebly alkaline reaction; be capable of emulsifying at feebly acid reaction and not be precipitated on dilution with water.  The stabilized emulsions may be mixed with alkaline building materials, e.g. quicklime and hydraulic silicates; neutral materials such as calcium sulphate cement, or acid materials such as Sorel cement.  The emulsions can also be acidified directly by the addition of hydrochloric or sulphuric acids.  A suitable condensation product may be prepared by reacting 100 parts of dioxydiphenylsulphone, made from a crude phenol mixture and containing about 2 parts combined cresols and 3 parts of combined phenol, for 3 hours at 100--103 DEG  C. with 25 parts of 37 per cent caustic soda lye and 50 parts of 30 per cent formaldehyde.  The product is cooled and diluted with 150 parts of water.  According to examples: (1) bitumen emulsion made with tall oil and caustic soda lye as an emulsifying agent, and containing about 50 per cent of bitumen, is mixed with 5 per cent of the condensation production solution prepared as above.  The emulsion may be mixed with calcium sulphate cement or a hydraulic silicate; (2) a bitumen emulsion is made with beef tallow and alkali, and 3,5 per cent of the above solution is added; (3) 200 parts of bitumen are emulsified in 100 parts of water by means of 0,25 part of 100 per cent sodium hydroxide.  20 parts of the above solution are added, and the emulsion diluted to 400 parts with water; (4) 200 parts of bitumen are stirred with 20 parts of the stabilizer solution while hot, and emulsified in 200 parts of water containing 0,2 per cent of 100 per cent caustic soda lye. Part of the water in the stabilized bitumen emulsion may be replaced by another colloidal system, e.g. latex, without affecting the stability, or the stabilized emulsions may be mixed with other bitumen emulsions.  The mixtures with constructional materials are waterproof and the stabilized emulsions, particularly after the addition of materials such as latex to increase their adhesiveness may be used as binding materials in making compositions for building purposes, e.g. by admixture with sawdust, corkmeal, or the residues from the manufacture of tannin extracts, which possess sound-insulating properties. Specification 438,188, [Group V], is referred to.ALSO:Aqueous bituminous emulsions are stabilized by the addition to the emulsion of alkali-soluble formaldehyde condensation products derived from phenols, their substitution products and derivatives. The condensation products must be readily soluble in water of neutral to feebly alkaline reaction; be capable of emulsifying at feebly acid reaction and not be precipitated on dilution with water.  The stabilised emulsions may be mixed with alkaline building materials, e.g. quicklime and hydraulic silicates, neutral materials such as calcium sulphate cement, or acid materials such as Sorel cement.  The emulsions can also be acidified directly by the addition of hydrochloric or sulphuric acids.  A suitable condensation product may be prepared by reacting 100 parts of dioxydiphenylsulphone, made from a crude phenol mixture and containing about 2 parts combined cresols and 3 parts of combined phenol, for 3 hours at 100-103 DEG  C. with 25 parts of 37 per cent caustic soda lye and 50 parts of 30 per cent formaldehyde.  The product is cooled and diluted with 150 parts of water.  According to examples: (1) a bitumen emulsion made with tall oil and caustic soda lye as an emulsifying agent, and containing about 50 per cent of bitumen, is mixed with 5 per cent of the condensation product solution prepared as above.  The emulsion may be mixed with calcium sulphate cement or a hydraulic silicate; (2) a bitumen emulsion is made with beef tallow and alkali and 3,5 per cent of the above solution is added; (3) 200 parts of bitumen are emulsified in 100 parts of water by means of 0,25 parts of 100 per cent sodium hydroxide, 20 parts of the above solution are added, and the emulsion diluted to 400 parts with water; (4) 200 parts of bitumen are stirred with 20 parts of the stabilizer solution while hot, and emulsified in 200 parts of water containing 0,2 per cent of 100 per cent caustic soda lye. Part of the water in the stabilized bitumen emulsion may be replaced by another colloidal system, e.g. latex, without affecting the stability, or the stabilized emulsions may be mixed p  with other bitumen emulsions.  The mixtures with constructional materials are waterproof and the stabilized emulsions, particularly after the addition of materials such as latex to increase their adhesiveness may be used as binding materials in making compositions for building purposes, e.g. by admixture with sawdust, corkmeal, or the residues from the manufacture of tannin extracts, which possess sound-insulating properties. Specification 438,188 is referred to.