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Polyvinylidene chloride (PVDC) emulsion and preparation method thereof as well as weather-proof barrier coating and application thereof

A technology of polyvinylidene chloride and vinylidene chloride, which is applied in the direction of coating, etc., can solve the problems of low adhesion, low molecular weight, and low crystallization temperature of barrier coatings, so as to improve adhesion, suppress side reactions, The effect of increasing content

Active Publication Date: 2014-03-12
SUZHOU FIRST PV MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although PVDC has excellent barrier properties as a packaging material, there are still some defects in use, such as low adhesion. Before coating PVDC emulsion, a layer of primer needs to be applied to increase the adhesion of PVDC coating to the substrate.
In addition, the weather resistance is not good enough to be used outdoors. The outdoor sunlight contains a large amount of ultraviolet rays. Under the irradiation of ultraviolet rays, HCl is easily decomposed in the PVDC resin, and the PVDC coating is easily yellowed and powdered. The molecular weight of polyvinylidene chloride in vinylidene chloride emulsion is low, most of which are in the range of 5×10 4 Next, the crystallization temperature of the barrier coating prepared by such polyvinylidene chloride emulsion is low, and these defects limit the application of PVDC in some special fields: for example, the outermost layer material of the photovoltaic solar cell The board provides weather resistance and moisture barrier properties, and must be able to withstand high temperatures above 130°C

Method used

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  • Polyvinylidene chloride (PVDC) emulsion and preparation method thereof as well as weather-proof barrier coating and application thereof
  • Polyvinylidene chloride (PVDC) emulsion and preparation method thereof as well as weather-proof barrier coating and application thereof
  • Polyvinylidene chloride (PVDC) emulsion and preparation method thereof as well as weather-proof barrier coating and application thereof

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preparation example Construction

[0029] The molecular weight of the polyvinylidene chloride copolymer in the polyvinylidene chloride emulsion is closely related to its corresponding free radical activity, reaction temperature, reactant concentration, reaction vessel pressure (because the vinylidene chloride monomer is a gas), and stirring speed. . Therefore, in order to prepare ultra-high molecular weight (1.5×10 5 Above) polyvinylidene chloride emulsion of polyvinylidene chloride copolymer, the preparation method of polyvinylidene chloride emulsion of the present invention comprises the following steps: (a) pre-reaction: first vacuumize the reaction vessel and feed inert gas , then add the deionized water, initiator, polar group-rich monomer, acrylate monomer, and emulsifier in sequence, and then raise the temperature to 140-160°C under stirring conditions to maintain the pressure in the reaction vessel Keep the temperature at 0.2-1.2 MPa and feed the vinylidene chloride monomer in the formula amount, and c...

Embodiment 1

[0040] Polyvinylidene chloride emulsion raw material formula: deionized water 50kg, vinylidene chloride monomer 40kg, methyl methacrylate 10kg, diisopropyl peroxydicarbonate 0.1kg, sodium dodecylsulfonate 0.5kg, Cellulose acetate 0.5kg, dihydromyrcenyl ester monomer 5kg.

[0041] Preparation of polyvinylidene chloride emulsion:

[0042] (a) Pre-reaction: First vacuumize the pressure-resistant reactor with a volume of 100L and feed nitrogen, then add the above-mentioned quality deionized water, diisopropyl peroxydicarbonate, cellulose acetate, and dihydromyrcene in sequence Alcohol ester monomer, methyl methacrylate, sodium dodecylsulfonate, and then heated up to 160°C under the condition of stirring at a speed of 120 rpm, kept the pressure in the reaction vessel constant at 0.2MPa and introduced 40kg partial Dichloroethylene monomer (passing time is 1.5 to 3 hours), continue to react for 20 minutes;

[0043] (b) Cooling reaction: lower the temperature in the reaction vessel ...

Embodiment 2

[0049] Polyvinylidene chloride emulsion raw material formula: 40kg deionized water, 30kg vinylidene chloride monomer, 2kg ethyl methacrylate, 5kg dicyclohexyl peroxydicarbonate, 1.5kg sodium cetyl sulfonate, acetic acid 0.5 kg of cellulose, 5 kg of dihydromyrcenyl ester monomer, and 10 kg of 2,2-dimethyl-4-pentenyl ester.

[0050] Preparation of polyvinylidene chloride emulsion:

[0051] (a) Pre-reaction: first vacuumize the pressure-resistant reactor with a volume of 100L and pass it into argon, then add the above-mentioned quality of deionized water, dicyclohexyl peroxydicarbonate, cellulose acetate, and dihydrolauryl in sequence Enol ester monomer, 2,2-dimethyl-4-pentenol ester, ethyl methacrylate, sodium hexadecylsulfonate, and then heated to 140 under the stirring condition of 80 rpm ℃, keep the pressure in the reaction vessel constant at 1.2 MPa and feed 30 kg of vinylidene chloride monomer (the feeding time is 1.5 to 3 hours), and continue the reaction for 40 minutes; ...

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Abstract

The invention relates to polyvinylidene chloride (PVDC) emulsion, a preparation method of the emulsion, a weather-proof barrier coating including the polyvinylidene chloride emulsion, and the application of the coating. The PVDC emulsion comprises the following components in parts by weight: 40-50 parts of deionized water, 30-40 parts of a vinylidene chloride monomer, 2-10 parts of an acrylic ester monomer, 5-20 parts of a monomer rich in polar groups, 0.1-5 parts of an initiator and 0.5-1.5 parts of an emulsifier, wherein the monomer rich in polar groups is one or more of 2, 2-dimethyl-4-pentene alcohol ester, dihydromyrcene alcohol ester and cellulose acetate; the monomer rich in polar groups is introduced in the raw material formula, so that the content of polar groups of the polymer in the PVDC emulsion can be increased, and the adhesion on the enhancement layer of the intermediate structure is improved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polyvinylidene chloride emulsion, a preparation method of the polyvinylidene chloride emulsion, a weather-resistant barrier coating prepared by using the polyvinylidene chloride emulsion, and an application of the weather-resistant barrier coating. Background technique [0002] In the field of packaging, using a single material as a packaging material often fails to meet the requirements for use. For example, paper is widely used to package food because it is cheap and easy to obtain, and has oil absorption. However, food packaged in paper cannot keep fresh because of the barrier of paper. The performance is very poor, moisture and oxygen can freely pass through the paper product and enter the packaging, causing food spoilage. Therefore, as a packaging material, it is often required to have excellent barrier properties. At present, the widely used barrier packaging...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F220/14C08F220/18C08F251/02C08F2/06C09D127/08C09D151/02C09D151/00C09D7/12
Inventor 杨楚峰汤建成潘建军周光大
Owner SUZHOU FIRST PV MATERIAL CO LTD
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