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A technology for coating materials and paper products, applied in paper coating, coating, papermaking, etc., can solve the problems of soybean protein adhesives such as poor water resistance, unsatisfactory water resistance, and affecting product quality, so as to achieve good plasticity and prevent precipitation , Increase the effect of cohesion and toughness
Active Publication Date: 2016-11-02
上海同惠油墨涂料有限公司
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[0003] Natural protein adhesive has the characteristics of abundant raw materials, cheap price, hot pressing, and no peculiar smell. It is suitable for manufacturing food packaging materials. As an adhesive, soybean protein contains a large number of hydroxyl groups and amino groups. It is especially soluble in water, which makes soybean protein adhesives have the disadvantage of poor water resistance, and calcium hydroxide and sodium silicate are used in the formula of traditional soybean protein adhesives. Modification of soybean protein by these substances will only increase the dry strength, and a large amount of The hydroxyl and amino groups are not destroyed, and the hydroxyl and amino groups are dissolved under the action of water, which affects the quality of the product. The traditional method of preparing modified soybean protein glue is simply to modify and separate the soybean protein. This method is used to prepare Adhesives with high water resistance are still unsatisfactory, and there are problems such as low wet strength and non-corrosion resistance
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[0034] The preparation method of modified polylactic acid is as follows:
[0035] Weigh 5g of polylactic acid particles and dissolve them in 100mL of acetonitrile to obtain a solution with a concentration of 0.05g / mL, add 2.5g of PVP, shake well and let stand until the polylactic acid solid dissolves, then add 0.25g of montmorillonite, and disperse ultrasonically at 30°C 30min to obtain the oil phase mixture; take 50mL of 0.01g / mL polyvinyl alcohol aqueous solution, add 0.1g monoglyceride laurate, stir and dissolve to obtain the water phase mixture; stir the water phase mixture on a magnetic stirrer, and use a syringe to Add the oil phase mixture dropwise. After the dropwise addition, continue to stir until the organic solvent is completely volatilized. Centrifuge the obtained mixture containing polylactic acid particles for 20 minutes at a speed of 10000r / min. Pour off the supernatant and remove the solid particles in the lower layer Take it out and place it in a drying dish,...
Embodiment 1
[0037] Modified polylactic acid: 30 parts
[0038] Palygorskite: 15 parts
[0039] Adhesive A: 5 parts
[0040] Polyether-modified polydimethylsiloxane: 0.05 parts
[0041] Alkyl glucoside: 0.5 parts
[0042] Polyoxyethylene polyoxypropanolamine ether: 0.1 parts
[0043] Garlic oil: 0.5 parts
Embodiment 2
[0045] Modified polylactic acid: 50 parts
[0046] Palygorskite: 20 parts
[0047] Adhesive A: 15 parts
[0048] Polyether-modified polydimethylsiloxane: 2 parts
[0049] Alkyl glucoside: 0.8 parts
[0050] Polyoxyethylene polyoxypropanolamine ether: 0.6 parts
[0051] Garlic oil: 0.8 parts
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Abstract
The invention discloses a coating material for a paper product. Halloysite, palyorskite and kaolinite are used as fillers and according to porousness of the halloysite, palyorskite and kaolinite, plant essential oil enters pores of the halloysite, palyorskite and kaolinite so that plant essential oil can be slowly released. The wet halloysite, palyorskite and kaolinite have viscosity, plasticity and good suspension properties and can effectively prevent coating deposition and layering. Through modification of a soybean protein, hydrophily of the soybean protein is changed into hydrophobicity so that coating water resistance is improved. Through crosslinking of the soybean protein and glutaraldehyde and use of a chain extender for chain extension, a complex net structure is formed in the soybean protein and soybean protein cohesion and toughness are improved. Through mixing of the modified soybean protein and the modified polylactic acid, paper product barrier properties are improved.
Description
technical field [0001] The present invention relates to a coating material, and more particularly to a coating material for a paper product to enhance the barrier properties of the paper product. Background technique [0002] Packaging materials generally need to have good mechanical properties, barrier properties, recyclability or biodegradability. At present, the most important packaging materials are paper and plastic, but paper has hygroscopicity and porosity, and its strength will decrease after being exposed to moisture, and its barrier property is poor. These shortcomings limit the application of paper materials in some food packaging and barrier packaging. The water blocking performance of wrapping paper is not good, and dry products will absorb moisture in the environment and cause loss of brittleness, while vegetables and fruits lose moisture and cause shriveling and shrinkage, and frozen or refrigerated foods lose moisture and cause quality problems; the resistan...
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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