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Water-based pigment dispersing agent for latex water paint

A technology of water-based pigments and dispersants, applied in the direction of coating, etc., can solve the problems of not being able to use cationic dispersants, limited application range, and small coating ability

Inactive Publication Date: 2005-05-04
上海市涂料研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The above-mentioned traditional dispersants, because the molecular weight is too small, although they have good wettability, they do not perform well in terms of dispersion performance.
The hydrophilic part of the molecular chain of these dispersants is too small to resist the mutual aggregation of pigments due to insufficient chain length.
In addition, because the pigment itself also shows a certain acidity and alkalinity, if it is an ionic dispersant, it will be limited in the scope of use. In addition, the latex paint is covered with an anionic emulsifier, so it cannot be used in latex paint. with cationic dispersant
Moreover, the ionic dispersant is sensitive to the pH value, which limits its application range.

Method used

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  • Water-based pigment dispersing agent for latex water paint
  • Water-based pigment dispersing agent for latex water paint
  • Water-based pigment dispersing agent for latex water paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1 (Test No. 17, 21)

[0080] 1. Synthetic formula of dispersant:

[0081] Raw material name % by weight

[0082] TX-10(100%) 3.38~5.23

[0083] MDI (100%) 4.48~4.95

[0084] Polyethylene glycol ether glycol 6000 92.14~95.05

[0085] Polymerization degree m 6~4

[0086] Dibutyltin dilaurate 0.04~0.08

[0087] 2. Process:

[0088] Put toluene, TX-10, and polyethylene glycol ether glycol 6000 together into a 500ml four-necked flask, reflux and dehydrate at 110-114°C, and react for two hours under nitrogen protection. After there is no water in the system, cool down to 75°C, add dibutyltin dilaurate and MDI monomer-toluene solution, and react at 75°C for 3 hours. Then the reactant was removed, and the toluene was removed to obtain a solid product.

[0089] 20 parts of the above solid product, 60 parts of water, and 20 parts of propylene glycol were formulated into a dispersant solution.

[0090] 3. Perform...

Embodiment 2

[0114] Embodiment 2 (Test No. 18, 22)

[0115] 1. Synthetic formulation of dispersant

[0116] According to formula number 18 and structure No. 22, the molecular weight of polyethylene glycol ether glycol is set to 8000, the degree of polymerization is 4 and 8, and the fixed MDI and TX-10 do not change.

[0117] Raw material name % by weight

[0118] TX-10(100%) 3.82~5.28

[0119] MDI (100%) 3.62~4.00

[0120] Polyethylene glycol ether glycol 8000 92.57~96.00

[0121] Toluene 250

[0122] Polymerization degree 4~8

[0123] Dibutyltin dilaurate 0.04~0.08

[0124] 2. Process

[0125] 500ml ground-mouthed four-neck flask, each mouth is installed separately: the middle mouth is equipped with stirring, the left mouth is equipped with a reflux condenser, the mouth is equipped with a nitrogen inlet pipe, the front mouth is equipped with a thermometer, electric heating is used for d...

Embodiment 3

[0152] Embodiment 3 (Test No. 19, 23)

[0153] 1. Synthetic formulation of dispersant

[0154] Raw material name % by weight

[0155] TX-10 (100%) 4.08~5.98

[0156] MDI (100%) 3.09~3.40

[0157] Polyethylene glycol ether glycol 10000 92.82~90.62

[0158] Toluene 250

[0159] Polymerization degree m 3~2

[0160] Dibutyltin dilaurate 0.04~0.06

[0161] 2. Process

[0162] Put toluene, TX-10, and polyethylene glycol ether glycol together into a 500ml four-neck flask, heat, reflux, and dehydrate under stirring. The azeotropic dehydration temperature is 110-114°C under nitrogen protection. After there is no water in the system, the temperature is lowered to 75°C, and dibutyltin dilaurate and MDI monomer-toluene solution are added. React at 75°C for 3 hours, remove the reactant, and remove toluene to obtain a solid product.

[0163] Take 20g of solid additive, add 60g of water, 20g of propylene gl...

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Abstract

The invention relates to a kind of waterbase pigment dispersing agent for latex paint. The manufacturing method of it contains the steps as follows: put wetting agent TX-10 (its molecular formula: C9H19C6H4(OCH2CH2)10OH), polyglycol ether dibasic alcohol, and solvent toluene together into quadrhole bottle; in protection of ammonia gas, stir, heat, reflux, and dehydrate with 110-114deg.C dehydrating temperature; after dehydrating to anhydrous, drop in the temperature to 70-80deg.C, and add diisocyanate and catalyst dibutyl didodecyl acid stannum; after reacting for 2-4 hours in 70-80deg.C, shift out the reactants and leak out toluene in order to get solid dispersing agent product. Among them, the reactant dosage can be describes by weight percent as follows: wetting agent TX-10 is 2.0-6.0%, diisocyanate is 1.0-5.0%, polyglycol ether dibasic alcohol is 91.0-97.0%, and dibutyl didodecyl acid stannum is 0.04-0.08%. The color paste dispersed and manufactured by the method mentioned above has excellent subsidence repellency, dispersion stability, and color rendering property.

Description

technical field [0001] The invention relates to a neutral high polymer dispersant, in particular to a water-based pigment dispersant for latex paint. Background technique [0002] The first developed water-based pigment dispersant for latex paint has a low molecular weight, and generally includes two systems: one is inorganic polymetaphosphate such as sodium hexametaphosphate, sodium polyphosphate, etc. Sodium hexametaphosphate is a linear compound with about 20 to 100 phosphates in the chain. Polyphosphate can disperse fine inorganic particles and is often used as a dispersant for oil paint pigments. The polyphosphate anion can react with Ca in hard water + , Mg + , Fe + Plasma complexation forms colloidal polyanions and covers the calcium carbonate crystal surface to prevent the growth of calcium carbonate crystals. This situation commonly exists in latex paints that use calcium carbonate as a filler. The other is alkali-soluble polyacrylic acid copolymer sodium salt w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12
Inventor 何新照丁奋
Owner 上海市涂料研究所有限公司