PURPOSE: To attain rapid self-repair by executing failure repairing work based upon a case corrected by a case contents correcting means when an application deciding means decides that its work can not directly be applied. CONSTITUTION: A case detecting means retrieves plural cases stored in a case storing means 17 and detects the case of a failure state and a failure cause diagnosed by a failure diagnostic means 12. When there are plural cases detected by the case detecting means, which case is to be applied to repairing work with priority is determined by a priority order determining means. When an application deciding means decides that work included in the case to be applied can not directly be applied to the failure repair of a device, correction necessary for the contents of the case to be applied is executed. When the application deciding means decides that the work can not directly be applied, the work of a corrected case is executed. Thus, the rapid self-repair can be executed. COPYRIGHT: (C)1992,JPO&Japio

Self-diagnostic and self-repairing system for image formation device

The present invention relates to a process for preparing an aqueous solution of sulfonated melamine-formaldehyde resin, and a cement composition in which the solution and a setting retarder are added to a concrete, a mortar, a cement paste or the like. And the process comprises the following step (A), step (B) and step (C): Step (A): a step of adjusting an aqueous solution containing melamine (a), formaldehyde (b), sulfanilic acid (c) and an alkali substance (d) to (a):(b):(c)=1:2.5- 3.5:0.5-1.5 in molar ratio and its pH to 8.0-13.5, and thereafter heating the aqueous solution at 50-90°C to conduct the reaction until free sulfanilic acid decreases to 40-90 mol% of the amount of sulfanilic acid charged; Step (B): a step of adding an inorganic acid to the reaction liquid obtained in the step (A) to adjust its pH to 6.0-8.0, and thereafter heating the reaction liquid at 50-90° to conduct the reaction until free sulfanilic acid decreases to 20-60 mol% of the amount of sulfanilic acid charged; Step (C): a step of adjusting a pH of the reaction liquid obtained in step (B) to 7.0-13.5.

Process for preparing an aqueous solution of sulfanilic acid modified melamine-formaldehyde resin and a cement composition

PURPOSE:To facilitate operations and to take a well balanced photographing by operat ing a range-finding means even when the function of maintaining a range ring is active, and obtaining each focal point information immediately before releasing. CONSTITUTION:A camera possesses a photometric circuit 7 for carrying out photometry in the plural areas in a objective field under the control of a microcomputer (muP) 1, a focal point detecting circuit 6 for range-finding the plural areas, and a lens driving circuit 2 for controlling the driving of the range ring of a lens to a well focused position obtained from each focal point information from the circuit 6, etc., and the function of maintaining the range ring at the well focused position. Even when the function of maintaining the range ring is active, the focal point detecting circuit 6 is operated and each focal point information just immediately before the releasing is inputted into the storobo light flashing and dimming control circuit 5 though the MUP 1. In the circuit 5, each photometric value from a photometric circuit 7 is evaluated based on this information and flash light emitting quantity is decided. Thus, even when framing is changed after a well focused state is maintained, appropriate exposure is attained without carrying out troublesome operations and a picture well balanced with a background can be taken.

Multiple-dimming camera

Production of sulfonic acid group-containing condensate based on amino-s-triazine and formaldehyde

The invention discloses a synthetic method of a sulfonated melamine water reducing agent for gypsum, which comprises the steps of: weighing formaldehyde, melamine and urea, adding water to mix to obtain mixed solution, regulating a pH value of the mixed solution into 9 to 10, and performing a heating reaction to obtain methylol melamine and hydroxymethyl urea solution; adding ammonium sulfite intothe methylol melamine and hydroxymethyl urea solution, regulating a pH value into 6 to 10 for the first time to perform a sulfonation reaction, then regulating the pH value of a reaction system to 6to 8 for the second time to perform a reaction, and finally, regulating the pH value of the reaction system to 6 to 8 for the third time to perform a heat preservation reaction to obtain the sulfonated melamine water reducing agent. In the mode, according to the synthetic method of the sulfonated melamine water reducing agent for the gypsum, which is disclosed by the invention, various propertiesof a gypsum-based mixture can be obviously improved, and the sulfonated melamine water reducing agent is good in compatibility to other admixtures, is not delayed in coagulation, is prominent in earlystrength effect, is colorless and has wide application.

Synthetic method of sulfonated melamine water reducing agent for gypsum

PURPOSE:To produce the titled aqueous solution excellent in storage stability, by reacting melamine, etc., with formaldehyde and a sulfite in an aqueous medium and, after adding amido-sulfonic acid, reacting the resulting reaction mixture. CONSTITUTION:A melamine-based amino group-containing substance (a substance consisting of melamine and about 0-20wt%, urea, etc. based thereon,) is reacted with formaldehyde and a sulfite (e.g., sodium sulfite) in an aqueous medium by heating for 20-60min under conditions including an NH2:CH2O:SO3 molar ratio of 1:0.9-1.1:0.3-0.4, a pH of 10-13, and a temperature of 60-80 deg.C. After adjusting the pH to 4-6 by adding amidosulfonic acid, the resulting reaction mixture is reacted at 40-60 deg.C for 50-300min and then, after adjusting the pH to 11.5-13.5, this is cooled to obtain a highly concentrated aqueous solution of sulfonated amino resin.

Production of highly concentrated aqueous solution of sulfonated amino resin

Manufacture of high concentration concrete water-reducing agent aqueous solution

PURPOSE:To inhibit contamination with alkali by adding the Ca salts or Mg salts of melamine, formaldehyde, and amidosulfonic acid in specific mole ratio to water, mixing the above, adjusting pH, and then carrying out heating CONSTITUTION:The Ca salts or Mg salts of melamine(M), formaldehyde(F), and amidosulfonic acid(S) are mixed so that M/F/G is regulated to 1/(33-60)/(03-15) by mole, and then, water is added to the above so that the concentration of the salt of sulfonated melamine resin as a reaction product is regulated to 20-50wt% in the resulting solution to form the resulting mixture into slurry state Subsequently, the pH value of this slurry is adjusted to 65-80, and this slurry is heated to 60-90 degC and allowed to react for 5-12hr, by which an aqueous solution of the salt of sulfonated melamine resin having 20-50wt% solid concentration and 10-500cPs viscosity can be obtained By adding amino alcohol, KOH, etc, to the above aqueous solution, the pH value of this solution is increased, by which an aqueous solution of transparent superplasticizer can be prepared By carrying out concentration or drying, if necessary, a superplasticizer can be obtained

Kobayashi Shigekatsu

Papers

Production of highly concentrated aqueous solution of sulfonated amino resin

Manufacture of high concentration concrete water-reducing agent aqueous solution

Production of high-performance water decreasing agent