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A kind of preparation method and application of soap-free coating emulsion

A technology of coating emulsion and reaction, which is applied in the field of preparation of coating emulsion for papermaking, can solve problems such as gelation, implosion, multiple emulsifiers, etc., and achieve the effect of avoiding gelation and implosion

Active Publication Date: 2020-01-10
山东奥赛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still belongs to the method of conventional emulsion polymerization and needs to add more emulsifiers
At the same time, local implosion and gelation are prone to occur

Method used

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  • A kind of preparation method and application of soap-free coating emulsion
  • A kind of preparation method and application of soap-free coating emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method for soap-free coating emulsion, comprising the following steps:

[0039] (1) Add 240kg of acrylic acid, 60kg of hydroxyethyl acrylate, and 100kg of butyl acrylate into the reactor, stir and heat up to 70-75°C, and add a total of 0.76kg of azobis Isobutyronitrile (AIBN), then control the reaction temperature at 80-85°C, react for 1.5h, then add 600kg of deionized water, and adjust the pH to 7-8 with 15% sodium hydroxide solution;

[0040] (2) 10kg N, N-dimethylacrylamide, 3kg N-methylolacrylamide, 0.4kg emulsifier NP-10, 0.5kg sodium lauryl sulfate are dissolved in 50kg deionized water, and then Add 210kg of styrene, 140kg of methyl acrylate, and 100kg of butyl acrylate under vigorous stirring to form a pre-emulsion, which is the drop solution A; at the same time, dissolve 1 kg of ammonium persulfate in 200 kg of deionized water to become the drop solution B.

[0041] (3) At 80-85°C, add dropwise solutions A and B to the reaction kettle mentioned ab...

Embodiment 2

[0044] A preparation method for soap-free coating emulsion, comprising the following steps:

[0045](1) Add 208.8kg of methacrylic acid, 69.6kg of hydroxyethyl methacrylate, and 116kg of butyl methacrylate into the reactor, stir and heat up to 70-75°C. Azobisisobutyronitrile (AIBN) in an amount of 0.58kg, then control the reaction temperature at 80-85°C, react for 1h, then add 600kg of deionized water, and adjust the pH to 7-8 with 15% sodium hydroxide;

[0046] (2) Dissolve 17kg of N,N-dimethylacrylamide, 2kg of OP-10, and 0.8kg of emulsifier 2A1 in 70kg of deionized water, then add 280kg of styrene, 190kg of ethyl acrylate, and 110kg of butyl acrylate under vigorous stirring , to form a pre-emulsion, which is the dripping solution A; at the same time, dissolve 1.6kg sodium persulfate in 200kg deionized water, which is the dripping solution B.

[0047] (3) At 80-85°C, drop the addition solutions A and B into the reaction kettle mentioned above at a constant speed at the same...

Embodiment 3

[0050] A preparation method for soap-free coating emulsion, comprising the following steps:

[0051] (1) Add 205.9kg of acrylic acid, 92.4kg of hydroxypropyl acrylate, and 52.8kg of butyl acrylate into the reaction kettle, stir and heat up to 70-75°C, divide it into 5 times at intervals of 5-10min, and add a total of 0.1kg of Azobisisobutyronitrile (AIBN), then control the reaction temperature at 80-85°C, react for 1.5h, then add 560kg of deionized water, and adjust the pH to 7-8 with 15% sodium hydroxide;

[0052] (2) Dissolve 8kg N-methylolacrylamide, 0.5kg N, N-methylenebisacrylamide, 0.9kg emulsifier 2A1 in 50kg deionized water, then add 200kg styrene and 60kg formaldehyde under vigorous stirring. Methyl acrylate and 160kg butyl acrylate form a pre-emulsion, which is the dripping liquid A; meanwhile, 1 kg of azobisisobutylimidazoline hydrochloride is dissolved in 200 kg of deionized water, which is the dripping liquid B.

[0053] (3) At 80-85°C, add dropwise solutions A a...

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Abstract

The present invention relates to a preparation method and application of a soap-free coating emulsion, comprising (1) initiating polymerization with azobisisobutyronitrile (AIBN) at 80-85°C after mixing anionic monomers and acrylate monomers, Make a high molecular polymer with surface activity, add water to dissolve and adjust the pH to be 7-8, as the reaction bottom material; (2) styrene monomer, acrylate monomer, cross-linking monomer and deionized water are emulsified Prepare a pre-emulsion under the emulsification of the agent, and make it into a drop solution A; mix the oxidizing agent and deionized water evenly to make a drop solution B; (3) drop A and B into the reaction bottom of (1) at the same time In the feed, control the reaction temperature at 85-90°C, cool down after the reaction is completed, and adjust the content to discharge at 49-50%. This method can produce a soap-free coating emulsion with more stable performance and wider application range. When used for surface coating of paper, it can improve the napping strength and softness of the paper surface, and endow the paper with good ink absorption and water resistance. wait.

Description

technical field [0001] The invention belongs to the technical field of preparation of coating emulsion for papermaking, and in particular relates to a preparation method and application of a novel soap-free coating emulsion. Background technique [0002] Coating emulsion is the last step in the production process of white board paper, mixed with china clay and other fillers in a certain proportion and then used as a top coat coating. The quality and cost of the white board paper coating are directly related to the coating liquid. There are two types of coating emulsions traditionally used. For example, the cost of styrene-butadiene emulsion made of butadiene is relatively low, but the paper coated with it is relatively brittle, has poor weather resistance, and is easy to yellow on the paper surface. At present, the coating liquid with better quality is made of monomers such as styrene and acrylic acid. Although the performance of this emulsion is better than that of styrene-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/18C08F220/58C08F220/54C08F220/06C08F220/20C08F2/26
CPCC08F2/26C08F212/08C08F220/06C08F220/20C08F220/1804C08F220/18C08F220/54C08F220/14C08F220/58C08F220/1802
Inventor 谢鹏白永亮
Owner 山东奥赛新材料有限公司