Unlock instant, AI-driven research and patent intelligence for your innovation.

Methods for producing dispersion containing silicon dioxide particles and cationization agent

A silicon dioxide, cationization technology, used in chemical instruments and methods, replication/marking methods, devices for coating liquids on surfaces, etc.

Active Publication Date: 2014-04-02
EVONIK OPERATIONS GMBH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Despite advances in the state of the art, processability and print quality improvements for high solids dispersions in the inkjet field are still key parameters to be improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methods for producing dispersion containing silicon dioxide particles and cationization agent
  • Methods for producing dispersion containing silicon dioxide particles and cationization agent
  • Methods for producing dispersion containing silicon dioxide particles and cationization agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Example 1: Preparation of cationizing agent from chloropropyltriethoxysilane (CPTEO) and N,N-dimethylethanolamine

[0078] A 4L four-necked flask was initially charged with 1283.0 g of CPTEO (5.328 mol) and 160.0 g of ethanol. At room temperature, 143.9 g of completely ion-free water (1.5 mol of H 2 O / mol Si). During this process, the kettle temperature was raised to about 40°C.

[0079] Then, 570.5 g (6.400 mol) of dimethylethanolamine were added within 6 min with stirring. During this process, the kettle temperature was raised from 40°C to approximately 48°C. Then reflux (pot temperature about 85° C.) for about 45 minutes.

[0080] At standard pressure, 1706.6 g of water / ethanol / dimethylethanoldiamine were distilled off during about 6 h. During this time, 2038.3 g of water were added in 7 portions with stirring. After approximately 3 h of distillation, a total of 432.4 g of completely ion-free water was introduced in 3 portions. The kettle sample then showed ...

Embodiment 2

[0085] Example 2: Preparation of Dispersions D1-D3

[0086] Dispersion Examples D1-D3 below were developed to enable the dispersions to be used as dilution liquids with similar performance in paper coatings in terms of pore structure and pore volume. The average aggregate size in the dispersion (measured using dynamic light scattering) is known as a measure of the porosity of the coating. In the system, higher filling levels lead to a decrease in the average particle size during dispersion. The examples show that use of the silane systems of the present invention provides a combination of very high packing levels with desirable aggregate size retention.

[0087] D1 : from 300 Dispersion of silica and polydiallyldimethylammonium chloride (p-DADMAC), (comparative example)

[0088] To 1350 g of completely ion-free water was added 60 g of p-DADMAC. Then, add 320g of 300 was stirred by the dissolver at 1500-4000rpm within 40min, and then further pre-dispersed at 2000rpm f...

Embodiment 3

[0094] Example 3: Preparation of Dispersions D4-D6

[0095] Dispersion Examples D4-D6 show that, regardless of the particle size parameter, the solids content is maximized with each cationizing additive. The dispersion has a very high viscosity, as desired, but is still liquid and processable.

[0096] D4 : from 300 Dispersion of silica and polydiallyldimethylammonium chloride (p-DADMAC) (comparative example)

[0097] To 1190 g of completely ion-free water was added 60 g of p-DADMAC. Then, add 320g of 300 was stirred by the dissolver at 1500-4000rpm, and then further pre-dispersed at 2000rpm for 5min. Thereafter, disperse under cooling (<30° C.) using a rotor-stator disperser at 15000 rpm for 10 minutes. Finally, the dispersion is filtered through a 500 μm sieve.

[0098] D5： from 300 dispersion of silica and N-butylaminopropyltrimethoxysilane ( 1189) (comparative example)

[0099] Initially add 1035g of water, and 21.2g of 1189 was stirred into the water. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m2 / g and 100 to 300 μg of cationizing agent per square metre of the BET surface area of the silicon dioxide particles, wherein the cationizing agent is obtainable by reacting at least one haloalkyl-functional alkoxysilane, its hydrolysis products or condensation products and / or a mixture thereof with at least one aminoalcohol and a defined amount of water and optionally removing the resulting hydrolysis alcohol at least partly from the reaction mixture. Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m2 / g and 100 to 300 μg of a cationizing agent per square metre of the BET surface area of the silicon dioxide particles, wherein the cationizing agent comprises one or more quaternary, aminoalcohol-functional, organosilicon compounds of the general formula III and / or condensation products thereof, wherein Ru and Rv are each independently of each other an alkyl group having 2 to 4 carbon atoms, m is 2 to 5 and n is 2 to 5.

Description

technical field [0001] The present invention relates to a process for preparing a dispersion comprising silica particles and a cationizing agent, the dispersion itself and the coating slip obtained therefrom. Background technique [0002] It is known to use aqueous dispersions containing silica for the preparation of coating slips for ink-receptive layers in the inkjet field. Cationic polymers are added to these dispersions in EP-A-1013605, DE-A-10033054 or EP-A-1331254 to improve the quality of the ink-receiving layer formed, more specifically the water fastness and ink density. But the addition of known cationic polymers leads to a considerable increase in viscosity, especially when using high-filler dispersions, and makes it impossible to process high-filler dispersions, which are This is particularly desirable because of the better formulatability of the coating slips formed and for ecological (reduced energy required in water evaporation and drying) and economical rea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/04C01B33/141B41M5/50C09K23/18C09K23/52C09K23/54
CPCB41M5/426D21H19/40B41M5/5218C01B33/141
Inventor S·沙尔芬A·霍伊施恩C·巴茨-佐恩B·施坦德克C·瓦斯莫H·拉克
Owner EVONIK OPERATIONS GMBH