New Method for Preparing Liquid Mixtures in Manufacture of Latex Articles Using Electromagnetic Field Energy

 

The new method belongs to manufacturing in­gredient dispersions for latex mixtures, preparing liquid strong-filled latex mixtures, introducing reinforcing fillers into latex film articles.

The method is widely used for preparing water dispersions of vulcanizing and gelatinating ingredients in the manufacture of latex foam.

The method is effected using the electromagnetic field energy.

Compared to the known methods, it has certain advantages:

• possibility of continuous production; total elimination of ball, vibrating and colloid mills from the production;
• reduction of process time hundreds of times;
• 30—40 times reduction of electric energy consumption;
• saving in expensive raw materials and floor area.

In the industrial realization of the new method, for example in the manufacture of latex foam, it becomes possible to continuously obtain dispersions of vulcanizing and gelatinating agents simultaneously introducing a cheap mineral filler (kaolin) into latex foam. The latex foam obtained by the new method contains 5—10 weight parts of kaolin, which permits the same amount of latex to be saved without im­pairing the quality of the finished product, the volume weight of latex foam being reduced by 10—20% with a 3—5 times decrease of residual strain after multiple compression which prolongs the article life 3—5 times.

Moreover, the new method may be used to introduce reinforcing fillers into latex film articles. Compared with the existing methods covering only some grades of lateces, the present method has certain valuable advantages:

possibility of introducing reinforcing fillers within 3—4 seconds with small amount of emulsifiers and at a high rate;

better quality of articles due to strength increase by 50—300%;

improved homogeneity and uniformity of the thickness of thin-walled articles with a reduced cost; reduced production expenditure.

COMPARATIVE CHARACTERISTICS OP CHLOROPRENE LATEX FILMS PILLED WITH AEROSILS DY DIPPERENT METHODS Method for introducing filler Aerosil grade Amount of filler, weight parts per dry weight of latex Physical and mechanical properties elon­gation, % tensile strength, kgf/cm2 perma­nent elonga­tion, % Ball mill Aerosil-175 15 746 180 18 Aerosil-300 10 805 185 22 New met­hod Aerosil-175 15 845 232 24 Aerosil^ 300 10 1,020 232 20

The existing methods for introducing reinforcing fillers into latex do not cover such fillers as kaolin and carbon black. The new method makes it possible to reinforce latex articles with these fillers.

COMPARATIVE CHARACTERISTICS OP CHLOROPRENE LATEX FILMS FILLED WITH KAOLIN AND CARBON BLACK BY THE NEW METHOD Filler Amount of filler, weight parts per dry weight of latex Physical and mechanical pro­perties elongation, % tensile strength, kgf/cm^ permanent elongation, % Kaolin 5 1,078 190 20 Carbon black 5 553 354 16 No filler 0 1,005 134 19

 

 

COMPARATIVE CHARACTERISTICS OBTAINED WHILE USING THE NEW METHOD AND BALL MILLS FOR INTRODUCING FILLERS INTO LATEX Ball mills New method Improvement of characteristics, times Specific energy consumption, kW/kg«h ^ 0.286 0.0019 150 Specific output, kg.h/m 230 515,000 2,240

It is possible to effect the method in special appa­ratuses using the electromagnetic field energy which are manufactured serially.

The new method is widely introduced at many compnies and is patented in a number of foreign countries including the USA, Italy, Great Britain, France, Germany and others.

The technology using the new method is mastered and may be shown to the interested firms in industrial operation.