Composite modified starch emulsion for coating and preparation method of emulsion

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

Active Publication Date: 2014-10-22
GANSU GLDARK NEW MATERIAL
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when acrylates are used in coatings, there are still problems suc...

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  • Composite modified starch emulsion for coating and preparation method of emulsion
  • Composite modified starch emulsion for coating and preparation method of emulsion
  • Composite modified starch emulsion for coating and preparation method of emulsion

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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 for 2 ho...

Embodiment 1

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

Embodiment 2

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

[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...

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Abstract

The invention discloses composite modified starch emulsion for a coating and a preparation method of the emulsion. The emulsion adopts modified starch obtained by cross-linking oxidized starch with acidified etherified starch as a framework and adopts hard monomer, soft monomer and functional monomer as mixed monomer. The preparation method comprises the following steps: mixing the oxidized starch with the acidified etherified starch to prepare starch milk, performing alkalization and cross-linking reaction, heating for pasting, and adding an emulsifier, an initiator solution and the mixed monomer for grafting reaction; adjusting the pH value by NaOH to obtain the emulsion for the coating. The emulsion has the advantages of acrylate and starch emulsion, and is excellent in film-forming performance, good in washability and breathability, formaldehyde-free and high in solid content. Compared with the existing common pure acrylic emulsion for the coating, the emulsion disclosed by the invention has the characteristics that the problems of poor film-forming performance, small adhesive force and high 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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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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