BE552216A

BE552216A -

Info

Publication number: BE552216A
Authority: BE
Priority date: 1956-10-30
Also published as: FR1160819A

Description

       

  La présente invention se rapporte à un procédé pour obtenir un copal destiné à des buts techniques.

  
Le procédé selon l'invention consiste en ce que  l'on réduit le copal brut en poudre, on met la poudre en suspension dans de l'eau, on chauffe le tout à une tempe- '  rature moindre que le point d'ébullition, on filtre, on lave le résidu du filtre, on sèche la poudre et on la fond.

  
Il est avantageux de réduire le copal brut en une poudre si fine, qu'elle passe à travers' un tamis ayant 100 mailles par 6,45 cm2. La poudre de copal est ensuite versée dans de l'eau, en remuant constamment, de façon à ce qu'elle forme une suspension, et le liquide est chauffé pendant 45

  
 <EMI ID=1.1> 

  
sion est ensuite filtrée et le résidu restant sur le filtre est avantageusement lavé deux fois à l'eau chaude.

  
 <EMI ID=2.1>  férable d'éviter que les particules de la poudre, s'agglomèrent pendant le séchage. La poudre doit pouvoir s'écouler tout-à-fait librement après le séchage.

  
Dès que la poudre est sèche, on procède à la fonte. De préférence, on élève lentement la température jusqu'à
260 - 270 [deg.] Cet maintient cette température pendant une demi-heure. Le copal fondu peut alors être coulé. Il est soluble dans les huiles.

  
Si l'on veut encore purifier le copal avant la fonte, on peut procéder de la manière suivante :

  
Le résidu du filtre est chauffé lors du séchage jusqu'à ce que la poudre devienne transparente, ce qui est le cas aux

  
 <EMI ID=3.1> 

  
des solvants organiques. On peut le dissoudre par exemple dans de l'alcool-n-butylique, le séparer de sés impuretés non solubles par filtrage, distiller ensuite pour éliminer

  
le solvant et traiter alors le résidu obtenu comme mentionné plus haut.

  
On peut ajouter du formaldéhyde à la suspension de

  
 <EMI ID=4.1> 

  
eau chaude. En pratique, cette adjonction est de 2% environ.

  
Une addition d'acide peut aussi, faire activer la réaction,

  
 <EMI ID=5.1> 

  
Il est recommandablé dans bien des cas d'employer un produit

  
 <EMI ID=6.1> 

  
tres cas, il est indiqué d'ajouter une substance basique à

  
l'eau, telle que du phosphate de sodium ou un acétate de

  
 <EMI ID=7.1> 

  
eau et l'on choisit;les ingrédients à ajouter suivant le

  
genre du produit brut 'travaillé et le résultat final désiré.

REVENDICATIONS .

  
 <EMI ID=8.1> 

  
techniques, caractérisé en ce que l'on réduit le copal brut

  
en poudre, on met la poudre en suspension dans de l'eau, on

  
chauffe le tout à une température moindre que le point d'ébullition, on filtre, on lave le résidu du filtre, on sè-: 

  
che la poudre et on la fond.



  The present invention relates to a process for obtaining a copal for technical purposes.

  
The process according to the invention consists in reducing the raw copal to powder, the powder is suspended in water, the whole is heated to a temperature below the boiling point, it is filtered, the residue from the filter is washed, the powder is dried and melted.

  
It is advantageous to reduce the raw copal to such a fine powder that it passes through a sieve having 100 mesh per 6.45 cm 2. The copal powder is then poured into water, stirring constantly, so that it forms a suspension, and the liquid is heated for 45

  
 <EMI ID = 1.1>

  
The residue is then filtered and the residue remaining on the filter is advantageously washed twice with hot water.

  
 <EMI ID = 2.1> reliable to avoid that the particles of the powder, agglomerate during drying. The powder must be able to flow completely freely after drying.

  
As soon as the powder is dry, we proceed to melting. Preferably, the temperature is slowly raised to
260 - 270 [deg.] This maintains this temperature for half an hour. The molten copal can then be poured. It is soluble in oils.

  
If you still want to purify the copal before melting, you can proceed as follows:

  
The filter residue is heated during drying until the powder becomes transparent, which is the case with

  
 <EMI ID = 3.1>

  
organic solvents. It can be dissolved for example in n-butyl alcohol, separated from its insoluble impurities by filtering, then distilled to remove

  
the solvent and then treat the residue obtained as mentioned above.

  
Formaldehyde can be added to the suspension of

  
 <EMI ID = 4.1>

  
Hot water. In practice, this addition is approximately 2%.

  
An addition of acid can also activate the reaction,

  
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It is recommended in many cases to use a product

  
 <EMI ID = 6.1>

  
in many cases, it is advisable to add a basic substance to

  
water, such as sodium phosphate or acetate

  
 <EMI ID = 7.1>

  
water and choose; the ingredients to add according to

  
kind of raw product 'worked and the desired end result.

CLAIMS.

  
 <EMI ID = 8.1>

  
techniques, characterized in that the raw copal is reduced

  
powder, we suspend the powder in water, we

  
heat everything to a temperature below the boiling point, we filter, we wash the residue from the filter, we s-:

  
che the powder and melt it.

Claims

2. Method according to claim 1, characterized

in that the raw copal is pulverized so that it

passes at least through a 100 mesh x 6.45 sieve

2.

cm

3. Method according to claim 1, characterized in

that the suspension is brought to a temperature between- <EMI ID = 9.1>

4. Method according to claim 3, characterized in

which we maintain the suspension for 45 minutes at the

quotes temperature. 5. Method according to claim 1, characterized in that one begins the drying of the filter residue at a time.

70 and 75 [deg.] C.

6. Method according to claim. 1, characterized in that the dried residue is brought to an included temperature. between 260 - 270 [deg.] C.

7. Method according to claim 6, characterized in. that we maintain this temperature for 30 minutes.

se in that we interrupt the. drying as soon as the powder has become transparent, by dissolving it in an organic solvent, by filtering the solution, by evaporating the solvent and by melting the residue at a temperature -

terized in that n-butyl alcohol is used as a solvent.

11. The method of claim 1, characterized

in that formaldehyde is added to the suspension.

12. The method of claim 1, characterized

in that an acid is added to the suspension.

13. The method of claim 12, characterized in that phosphoric acid is used.

14. The method of claim 1, characterized in that an oxidizing product is added to the suspension.

15. The method of claim 14, characterized in that hydrogen peroxide is used.

16. The method of claim 1, characterized in that a basic substance is added to the suspension. 17. The method of claim 16, characterized in that one uses natrium phosphate.

20. Copal obtained by the process according to any one of the preceding claims.