CN104910418A - Diatomite containing active calcium carbonate with high caking property - Google Patents

Abstract

The invention discloses a diatomite containing active calcium carbonate with high caking property. The diatomite containing active calcium carbonate with high caking property is prepared from the following raw materials by weight part: 80-90 of calcium carbonate, 2-5 of alumina, 1-2 of monobutyltin oxide, 2-5 of acrylic acid, 3-5 of polyacrylamide, 1-2 of natural rubber powder, 0.8-0.9 of zinc stearate, 0.3-0.5 of expanded vermiculite powder, 4-7 of diatomite, 2-4 of microcrystalline wax, 4-6 of stearic acid, and a proper amount of deionized water.

Description

A kind of have high-adhesion containing diatomaceous activated Calcium carbonate

Technical field

The present invention relates to calcium carbonate field, be exactly a kind of have high-adhesion containing diatomaceous activated Calcium carbonate.

Background technology

Activated Calcium carbonate take calcium carbonate as base-material, adopts polyfunctional surfactant and composite efficient processing aid, carry out modified active process form inorganic powder surface.Calcium carbonate powder after modification, surface forms a kind of special cladding structure, significantly can improve the dispersiveness in the polymer matrixs such as polyolefine and affinity, and produce interface interaction between energy and polymer matrix, thus improve the resistance to impact shock of goods, be a kind of incremental filling additive of excellent property.

Summary of the invention

The object of the present invention is to provide a kind of have high-adhesion containing diatomaceous activated Calcium carbonate.

Above-mentioned purpose is realized by following scheme:

Have high-adhesion containing a diatomaceous activated Calcium carbonate, it is characterized in that: it is obtained by the raw material of following weight parts: calcium carbonate 80-90, aluminum oxide 2-5, Mono-n-butyltin 1-2, vinylformic acid 2-5, polyacrylamide 3-5, natural rubber powder 1-2, Zinic stearas 0.8-0.9, expanded vermiculite powder 0.3-0.5, diatomite 4-7, microcrystalline wax 2-4, stearic acid 4-6, deionized water are appropriate.

Described a kind of have high-adhesion containing diatomaceous activated Calcium carbonate, it is characterized in that: preparation method comprises the following steps:

(1) calcium carbonate is added after in homogenizer, then add Mono-n-butyltin, vinylformic acid, microcrystalline wax, stir at 70-90 DEG C under 200-300rpm, obtain modified calcium carbonate for subsequent use;

(2) diatomite is joined in appropriate amount of deionized water, after stirring at 40-45 DEG C, then polyacrylamide, Zinic stearas are added wherein, stir at 40-44 DEG C, obtain combination solution;

(3) modified calcium carbonate and combination solution are mixed, ball milling mixes and obtains mixed slurry, adds all the other raw materials except stearic acid, reacts 20-30min at 55-58 DEG C;

(4) the reacted slurry of step (3) gained leaves standstill 5-8h, dry 6-8 hour at 70-80 DEG C, after vacuum-drying at 80-100 DEG C, obtain compound calcium carbonate powder;

(5) step (4) gained compound calcium carbonate powder is placed on rotary drum, preheating 10-20min at 40-50 rev/min lower 30-40 DEG C, again stearic acid is heated to 75-85 DEG C, atomization, evenly be sprayed on compound calcium carbonate powder, at 40-50 DEG C, 30-40 rev/min is stirred 30-35min, after stopping operating, and standing 20-30min and get final product.

Beneficial effect of the present invention is:

(1) rational formula of the present invention, with the addition of rubber powder and microcrystalline wax, and it is more lubricated when extruding, and cohesiveness is higher, more compatible, and by adding the very high diatomite of cohesiveness, further increase cohesiveness, natural rubber is environment friendly and pollution-free;

(2) the present invention is dispersed by adding dispersion agent, effectively prevents the autohemagglutination of miniaturization particle, increases its consistency in plastics, rubber and dispersiveness;

(3) the present invention adopts the mode of atomizing spray to make use of stearic acid cmpletely, adopts vacuum drying method, makes to avoid compound powder secondary agglomeration;

(4) product application that obtains of the present invention is in PVC plastic, because the properties-correcting agent of its surface chemistry bonding and PVC plastic have excellent compatibility, show strong interior lubrication, thus weaken the intermolecular reactive force of PVC, system rheological performance is changed, can extruded velocity be improved, make the smooth exquisiteness of products appearance; Also illustrate under equal conditions, modified calcium carbonate can increase loading level, also can reach well cost-saving effect simultaneously.

Embodiment

What have high-adhesion contains a diatomaceous activated Calcium carbonate, and it is obtained by the raw material of following weight (kg): calcium carbonate 90, aluminum oxide 3, Mono-n-butyltin 1, vinylformic acid 4, polyacrylamide 3, natural rubber powder 2, Zinic stearas 0.8, expanded vermiculite powder 0.5, diatomite 7, microcrystalline wax 4, stearic acid 6, deionized water are appropriate.

(1) calcium carbonate is added after in homogenizer, then add Mono-n-butyltin, vinylformic acid, microcrystalline wax, stir at 300rpm is lower 90 DEG C, obtain modified calcium carbonate for subsequent use;

(2) diatomite is joined in appropriate amount of deionized water, after stirring at 45 DEG C, then polyacrylamide, Zinic stearas are added wherein, stir at 44 DEG C, obtain combination solution;

(3) modified calcium carbonate and combination solution are mixed, ball milling mixes and obtains mixed slurry, adds all the other raw materials except stearic acid, reacts 30min at 58 DEG C;

(4) the reacted slurry of step (3) gained leaves standstill 8h, at 75 DEG C dry 8 hours, after vacuum-drying at 80 DEG C, obtain compound calcium carbonate powder;

(5) step (4) gained compound calcium carbonate powder is placed on rotary drum, preheating 20min at 40 revs/min lower 40 DEG C, then stearic acid is heated to 75 DEG C, atomization, is evenly sprayed on compound calcium carbonate powder, and at 40 DEG C, 40 revs/min are stirred 35min, after stopping operating, standing 30min and get final product.

The activated Calcium carbonate of ordinary calcium carbonate and the present embodiment is pressed formula batch mixing respectively, and room temperature carries out rheological experiment at PLE331 type torque rheometer after placing 8h, and result is as shown in table 1:

Table 1 rheological experiment result

Title peak torque/N.m balancing torque/N.m fusion time/S melt temperature/DEG C

Common CaCO ₃37.4 25.0 150 187

Modification CaCO ₃31.3 21.9 119 177

Described material prescription is: PVC 100 parts, one package stabilizer 5 parts, KM355P 6 parts, common CaCO ₃or the activated Calcium carbonate 20 parts of the present embodiment

As can be seen from table 1, add the activated Calcium carbonate of the present embodiment compared with ordinary calcium carbonate, moment of torsion reduces, fusion time obviously shortens, and melt temperature declines, and plasticizing rate accelerates, illustrate that activated Calcium carbonate and the PVC plastics Miscibility of the present embodiment are good, be conducive to processing.

Claims (2)

1. have high-adhesion containing a diatomaceous activated Calcium carbonate, it is characterized in that: it is obtained by the raw material of following weight parts: calcium carbonate 80-90, aluminum oxide 2-5, Mono-n-butyltin 1-2, vinylformic acid 2-5, polyacrylamide 3-5, natural rubber powder 1-2, Zinic stearas 0.8-0.9, expanded vermiculite powder 0.3-0.5, diatomite 4-7, microcrystalline wax 2-4, stearic acid 4-6, deionized water are appropriate.

2. according to claim 1 a kind of have high-adhesion containing diatomaceous activated Calcium carbonate, it is characterized in that: preparation method comprises the following steps:

(1) calcium carbonate is added after in homogenizer, then add Mono-n-butyltin, vinylformic acid, microcrystalline wax, stir at 70-90 DEG C under 200-300rpm, obtain modified calcium carbonate for subsequent use;

(2) diatomite is joined in appropriate amount of deionized water, after stirring at 40-45 DEG C, then polyacrylamide, Zinic stearas are added wherein, stir at 40-44 DEG C, obtain combination solution;

(3) modified calcium carbonate and combination solution are mixed, ball milling mixes and obtains mixed slurry, adds all the other raw materials except stearic acid, reacts 20-30min at 55-58 DEG C;

(4) the reacted slurry of step (3) gained leaves standstill 5-8h, dry 6-8 hour at 70-80 DEG C, after vacuum-drying at 80-100 DEG C, obtain compound calcium carbonate powder;

(5) step (4) gained compound calcium carbonate powder is placed on rotary drum, preheating 10-20min at 40-50 rev/min lower 30-40 DEG C, again stearic acid is heated to 75-85 DEG C, atomization, evenly be sprayed on compound calcium carbonate powder, at 40-50 DEG C, 30-40 rev/min is stirred 30-35min, after stopping operating, and standing 20-30min and get final product.