Preparation of systems of ground particulate material

Details Preparation of systems of ground particulate material Preparation of systems of ground particulate material

C - Chemistry, Metallurgy

09

C

C09C 3/04 (2006.01) C09C 1/02 (2006.01) C09C 3/00 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2231688

There is disclosed a process for preparing a concentrated aqueous suspension of a finely ground particulate material, which process comprises: (a) preparing an aqueous suspension comprising at least 20 % by weight of the particulate material in coarse particulate form; (b) grinding the suspension formed in step (a) in the presence of a polycarboxylate dispersing agent for the particulate material; (c) adding further polycarboxylate dispersing agent to the suspension of ground material formed in step (b). The process is characterized in that the aqueous suspension formed in step (c) has a pH which lies within the inclusive range 8.5 to 9.8 and in that, following addition of the polycarboxylate dispersing agent in step (c), the suspension is not ground further. Using the method described, suspensions can be prepared which are rheologically stable with time, and which contain a relatively high proportion by weight of a finely divided pigment.

Procédé de préparation d'une suspension aqueuse concentrée d'une matière particulaire finement broyée comprenant: a) la préparation d'une suspension aqueuse contenant au moins 20 % en poids de matière particulaire, sous forme de grosses particules; b) le broyage de la suspension formée à l'étape a) en présence d'un polycarboxylate dispersant la matière particulaire; c) l'adjonction supplémentaire de polycarboxylate à la suspension de matière broyée formée à l'étape b). Le procédé se caractérise par le fait que le pH de la suspension aqueuse formée à l'étape c) est situé entre 8,5 et 9,8 inclus et que la suspension n'est plus broyée après l'adjonction de l'agent dispersant polycarboxylate à l'étape c). Par le procédé décrit, il est possible de préparer des suspensions rhéologiquement stables dans le temps et contenant une proportion en poids relativement élevée d'un pigment finement broyé.

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