Classifications

• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06F—MATCHES; MANUFACTURE OF MATCHES
  • C06F3/00—Chemical features in the manufacture of matches

Definitions

• the usual safety match has proved insufliciently resistive to the influence of the moist air, and the reasons for this fact are among other things the following.
• the heads of the matches are porous, the moist air can easily penetrate even into the interior parts of the heads, thereby subjecting the whole igniting mass to the influence of the humidity.
• the greater part of the head consists of salts soluble in water, these salts will disappear partially due to the influence oi the humidity, and-as the binding l agent is capable of absorbing considerable amounts of water, it will lose its rigidity and be loosened from the match splint, when the latter is rubbed against an igniting surface.
• Another proposal involves the employment of a product of condensation, in which case the igniting composition has been prepared by mixing the requisite chemicals with water, phenol, aldehyde, and a catalyst.
• This method sufiers from considerable inconveniences due to the fact that the igniting mass, even after drying, still contains large amounts of water which cannot be removed.
• the product of condensation produced is by itself incombustible and cannot, as a result, aid in the development of power during the combustion, but on the other hand 10 large amounts of heat are required to vaporize the water included.
• the sensibility of the mass to ignition will still be sufiiciently high, even when such a large amount of binding agent as 20-30 per cent is used, which still, in turn, affords a reliable protection of the imbedded chlorate grains against moisture.
• the binding agent may by itself burn at a very low speed of combustion, a reduction of the speed of combustion of the igniting mass will consequently result, so that the combustible substance of the match splint (as wood, cardboard, stearin and so on) may have sufilcient time to be ignited.
• the artificial resin most suitable as binding agent is an intermediate product in the preparation of resite known as resol.
• a product especially fit for the purpose may be prepared, for instance, as follows: 100 parts phenol, 100 parts formaline, and 5 parts ammonia are heated to about 100 C., until a heavy muddiness appears as result of the precipitated resol, which is al lowed to settle to the bottom and then can be easily separated.
• This product is insoluble in water but easily soluble in alcohol, acetone and other usual solvents.
• the preparation of the igniting mass can either be effected by first dissolving the resol in alcohol and then admixing the other substances to be included in the mass, or by grinding the resol together with one or more of the substances not developing oxygen, and then moistening the mixture with alcohol and admixing the remaining chemicals.
• Such an igniting mass' may be of the following composition:
• the igniting mass of the above stated composition is fit for use as paste in the heading of matches which may be dried in the usual way after the heads have been put on. If it is desired toimpart to the match heads an especially high degree of hardness this may be effected by hardening at a temperature of 100-150 C. Ac cording to the time and temperature of the hardening process the resol will then be converted, less or more, into the final product, resite, which is non-burning. Moreover, the hardening process may be accelerated or carried out at lower temperature if a small quantity of, for instance, hexamethylene tetramine is added.
• Artificial resins may also be employed for the igniting composition of igniting rods, and the desired speed of combustion may be obtained by accordingly regulating the degree of hardening.
• a method of manufacturing a moistureproof initial igniting body which consists in mixing in an organic solvent, to form a pasty mixture, resol, a chlorate of alkali, and combustible and filling materials, said resol amounting to between 15 and 30 per cent and said chlorate of alkali amounting'to at least per cent by weight of the dry ingredients, forming such mixture into an igniting body, and evaporating the solvent.
• a method of manufacturing a moistureproof initial igniting body which consists in mixing in an organic solvent, to form a pasty mixture, resol and a chlorate of alkali, and combustible and filling materials, said resol amounting to between 15 and 30 per cent and said chlorate of alkali amounting to at least 50 per cent by weight of the dry ingredients, forming such mixture into an igniting body, evaporating the solvent, and converting the resol into resite by heat treatment.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• Phenolic Resins Or Amino Resins (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Dental Preparations (AREA)
• Processes Of Treating Macromolecular Substances (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Air Bags (AREA)

Priority Applications (6)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32045758

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (2)

• 0
  • NL NL38522D patent/NL38522C/xx active
  • BE BE399864D patent/BE399864A/xx unknown
• 1933
  • 1933-11-16 DE DEL84807D patent/DE640903C/de not_active Expired
  • 1933-11-21 GB GB32514/33A patent/GB414938A/en not_active Expired
  • 1933-11-27 FR FR764397D patent/FR764397A/fr not_active Expired
• 1936
  • 1936-05-15 US US80022A patent/US2128368A/en not_active Expired - Lifetime

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