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Composite modified starch emulsion for paint and preparation method thereof

A technology of compounding modified starch and starch milk, applied in the direction of coating, can solve the problems of poor solvent resistance, high hardness, hot stickiness and cold brittleness, etc., and achieve the effect of improving heat resistance, good emulsification and strong adhesion

Active Publication Date: 2016-07-06
GANSU GLDARK NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when acrylates are used in coatings, there are still problems such as high hardness, poor solvent resistance, hot stickiness and cold brittleness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] 3. The preparation process of acid hydrolyzed hydroxypropyl starch is as follows: in deionized water, add a swelling inhibitor relative to the starch mass ratio of 13%, add sodium hydroxide accounting for 1.0% of the starch mass, mix and stir until dissolved, and add the step (1) Adjust the prepared acid-thinned starch into 35% starch milk, stir and alkalinize for 40 minutes, heat up to 42°C, add propylene oxide accounting for 5% of the starch mass, etherify for 14 hours, add 10% hydrochloric acid to adjust the pH to 7.0, after centrifugal dehydration, drying and sieving, the acid hydrolyzed hydroxypropyl starch can be obtained;

[0047] 4. The preparation process of acid-thinned starch used in the preparation process of acid-thinned carboxymethyl starch and acid-thinned hydroxypropyl starch is as follows: add HCl solution with a mass percentage concentration of 0.6% to the starch, and prepare starch with a concentration of 38%. Milk, heated to 50°C, acidolysis reaction...

Embodiment 1

[0054] The amount of raw materials is as follows: 60kg of oxidized starch, 40kg of acid-decomposed etherified starch, 2kg of swelling inhibitor, 0.03kg of crosslinking agent, 35kg of hard monomer, 65kg of soft monomer, 1kg of functional monomer, 2kg of emulsifier, 1kg of initiator, 200kg of ionized water and 1.2kg of NaOH.

[0055] The preparation method of composite modified starch emulsion for coating comprises the steps:

[0056] (1) In the state of stirring, add oxidized starch and acid-hydrolyzed etherified starch in deionized water in parts by mass (acid-lyzed carboxymethyl starch sodium with a degree of substitution of 0.4 and acid-lyzed hydroxypropyl starch with a degree of substitution of 0.1 1:2 ratio) to form a certain concentration of starch milk;

[0057] (2) In step (1), the starch milk obtained in step (1) is added with a proportional expansion inhibitor sodium chloride, and the pH of the starch milk is adjusted to 10.5 with a sodium hydroxide solution with a v...

Embodiment 2

[0065] The amount of raw materials is as follows: oxidized starch 70kg, acid-decomposed etherified starch 30kg, swelling inhibitor 1.5kg, crosslinking agent 0.02kg, hard monomer 80kg, soft monomer 120kg, emulsifier 4kg, initiator 2.5kg, deionized water 300kg , NaOH is 1.5kg.

[0066] The preparation method of composite modified starch emulsion for coating comprises the steps:

[0067] (1) In the state of stirring, add oxidized starch and acid-hydrolyzed etherified starch in deionized water in parts by mass (acid-lyzed sodium carboxymethyl starch with a degree of substitution of 0.8 and acid-lyzed hydroxypropyl starch with a degree of substitution of 0.08 and 1:4 ratio) to form a certain concentration of starch milk;

[0068] (2) In the starch milk obtained in step (1), add the expansion inhibitor sodium chloride in proportion, and adjust the pH of the starch milk to 11 with a sodium hydroxide solution with a volume concentration of 5%;

[0069] (3) Add the cross-linking agen...

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Abstract

The invention discloses a compound modified starch emulsion for coatings and a preparation method thereof. The emulsion uses oxidized starch, acid-decomposed etherified starch cross-linked to obtain modified starch as a skeleton, and uses hard monomers, soft monomers and functional monomers as mixtures. Monomer; the preparation steps are as follows: mixing oxidized starch and acid-hydrolyzed etherified starch to prepare starch milk, alkalization cross-linking reaction, heating up gelatinization, adding emulsifier, initiator solution and mixed monomer for grafting reaction; adjusting pH with NaOH to obtain Emulsion for paint. The emulsion has the advantages of both acrylate and starch emulsions, and has excellent film-forming properties, good scrub resistance, good air permeability, no formaldehyde, and high solid content. Compared with the pure acrylic emulsion commonly used in existing coatings, the problems of film-forming, adhesion and hardness of the emulsion are improved, and the cost is effectively reduced.

Description

technical field [0001] The invention belongs to the field of environmental protection coatings, in particular to a composite modified starch emulsion for coatings and a preparation method thereof. Background technique [0002] Coatings are a mixture of polymer substances and their related ingredients, and can be coated on the surface of the substrate to form a new type of polymer material that adheres firmly and continuously to the coating film. Among them, the emulsion is the main film-forming substance of the paint, also known as the base material, and is the main component of the paint formula. Its composition and properties play a decisive role in the characteristics of the film painted on the surface of the building. At present, the main types of base materials for water-based coatings in my country are: acrylate emulsion, styrene-acrylic acid emulsion, acrylic acid-vinyl acetate emulsion and ethylene-vinyl acetate emulsion, etc. These are synthetic polymer resin emulsi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F2/28C08F2/30C08J3/24C08L3/10C08L3/08C09D151/02C08B31/18C08B31/12
Inventor 郑旺斌田映良马青斌崔芸赵倩
Owner GANSU GLDARK NEW MATERIAL
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