Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
  • B28B7/384—Treating agents

Definitions

• the present invention relates to a mold release product for hydraulic binders such as concrete for example.
• the mold release products currently used consist essentially of different formulations of a mixture of solvents and petroleum products to which are added mold release active ingredients (see DE-B-1 962 444).
• Emulsions more or less stable over time are also proposed, comprising percentages of petroleum products or graphite (see US-A-2,932,576 and FR-A-2,487,848).
• Release agents are known which are presented in the form of aqueous solutions (see US-A-1,967,830, BE-A-851,521 and FR-A-2,328,761). These products contain organic acids, organic acid salts, esters of meniral acids or meniral acids as an active mold release agent.
• the present invention provides a mold release product containing organic acid salts whose mold release efficiency is increased while making it possible to obtain a satisfactory surface condition of the parts and avoiding drying problems.
• the mold release product for hydraulic binder intended to coat the contact surfaces of the molds with the binder is essentially characterized in that it is an aqueous solution which contains, as the active release principle, an ammonium salt of organic acid. .
• the water mold release products according to the invention consist of the combination of an active mold release principle which has the purpose of detaching the manufactured parts from the walls of the mold, of an antifreeze clarifying agent which completes the solubility of the active principle and by increasing its dosage ensure resistance to frost, a smoothness agent which cooperates with the previous one to ensure a certain thickness of the film and its continuity and of water.
• the active release agent is an ammonium salt of organic acid.
• ammonia was chosen because of the good solubility of the salts obtained, the absence of harmful side effects on the action of the final product, such as delay in setting of the binder on the surface or dusting.
• ammonia has the advantage of giving off ammonia gas during saponification by the calcium ion present in the mixing water, the said ammonia gas providing a release aid.
• the anionic part of the organic acid salt consists of one or more organic acids from the group of carboxylic acids not containing more than one hydroxyl function per molecule.
• saturated or unsaturated straight chain, branched or cyclic hydrocarbon acids containing at least five carbon atoms and preferably from ten to thirty are used.
• acids can be hexanoic, decanoid, cyclohexylic, naphthenic, neodecanoic, abietic, dodecanoic, myristic, caprylic, oleic, palmitic, pelargomic, undecyclic, versatic acids.
• the antifreeze clarifying agent whose function has been stated above is hydroxyethyl ethyl ether or a mixture of such a compound of general formula R- (OCH2 CH2) n OH.
• This compound is chosen from those in which R represents a branched or linear aliphatic chain comprising one to six carbon atoms, n possibly varying from one to three.
• the spreading agent can also be chosen from hydroxyl and / or ethoxy esters.
• the choice is preferably made taking into account the most reduced incidence presented by the compound at the level of the delay-setting effect on the binder.
• the ester chosen as spreading agent is a derivative of a polyol such as, for example, glycerin, trimethylolpropane, pentaerythritol, etc., which is partially esterified with a mono or an organic fatty diacid.
• the free hydroxyl function (s) of the polyol will be ethoxylated so as to ensure a limited solubility of the product in water.
• the oiliness agent consists of water-soluble polymers.
• They can be linear polysaccharides or a very high molecular weight polyglycol.
• the criterion for choosing the product is that of the weakest delaying action on the setting of the hydraulic binder combined with the best lubrication effect.
• a polyglycol of very long chain length is used which has given the best results during the tests carried out.
• the dosage of the sequestering agent is carried out at the limit quantity to mask the calcium present in the water so that it does not in any way modify the final properties of the composition.
• the mold release product can be presented in the form of a concentrate dilutable in the proportion of two liters of water for a liter of product giving three liters of product ready for use.
• composition of the concentrate can be as follows: Manufacturing example
• rosins 50 grams are dissolved in 60 grams of butylglycol and then poured into 500 cm3 of water containing 0.14 mole of ammonia.
• the product is applied in any known way by brush, rag or spray on any non-greasy surface of the mold (iron, wood, concrete)
• the hydraulic binder can be poured.
• the surfaces of the molded parts are free of stains and no dusting phenomenon is observed.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Mechanical Engineering (AREA)
• Lubricants (AREA)
• Moulds, Cores, Or Mandrels (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Processing Of Solid Wastes (AREA)
• Sealing Material Composition (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Press-Shaping Or Shaping Using Conveyers (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Sampling And Sample Adjustment (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=9272574

Family Applications (1)

Country Status (12)

Families Citing this family (16)

Family Cites Families (18)

• 1982
  • 1982-03-25 FR FR8205481A patent/FR2523999B1/fr not_active Expired
• 1983
  • 1983-03-17 EP EP83400553A patent/EP0090707B1/fr not_active Expired
  • 1983-03-17 AT AT83400553T patent/ATE27563T1/de not_active IP Right Cessation
  • 1983-03-17 DE DE8383400553T patent/DE3371878D1/de not_active Expired
  • 1983-03-23 AU AU12741/83A patent/AU1274183A/en not_active Abandoned
  • 1983-03-24 CA CA000424403A patent/CA1201254A/en not_active Expired
  • 1983-03-24 NO NO831064A patent/NO160695C/no unknown
  • 1983-03-24 ZA ZA832110A patent/ZA832110B/xx unknown
  • 1983-03-24 DK DK133983A patent/DK133983A/da not_active IP Right Cessation
  • 1983-03-25 JP JP58050276A patent/JPS58217312A/ja active Pending
  • 1983-03-25 ES ES521357A patent/ES521357A0/es active Granted
  • 1983-03-25 US US06/479,030 patent/US4609570A/en not_active Expired - Fee Related

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