Oil-proof wrapping paper and preparation method thereof

A technology of wrapping paper and oil-proof paper, which is applied in the direction of wrapping paper, wrapping paper, packaging, etc., can solve the problems of oil-proof food wrapping paper not being environmentally friendly, high amount of oil-proof agent used, and low product strength, so as to improve product grade and Effect of adding value, improving surface oil repellency, and improving internal oil repellency

Active Publication Date: 2019-04-26
ZHEJIANG HENGDA NEW MATERIAL CO LTD
5 Cites 11 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that oil-proof food wrapping paper is not environmentally friendly, low in safety, high in oil-proofing agent us...
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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Abstract

The invention relates to oil-proof wrapping paper and a preparation method thereof and belongs to the technical field of food wrapping paper. According to the invention, a double oil-proof technologyis adopted, fluorobenzoyl chloride, dimethyl formamide and plant fiber microfilaments are mixed according to a certain proportion, oil-proof plant fiber microfilaments are prepared under certain reaction conditions, nanometer celluloses are subjected to fluorine-containing modification preparation by using the same method, and the double oil-proof wrapping paper is prepared by paper-making and surface application. The oil-proof wrapping paper and the preparation method thereof provided by the invention have the beneficial effects that the interior oil-proof performance and the surface oil-proof performance of the oil-proof wrapping paper are improved, and through double oil-proof treatment on the interior and the surface of pulp, the product achieves high oil-proof performance; in addition, the oil-proof wrapping paper is good in oil-proof performance, enhancement performance and barrier performance, so that the product grade and the value added are improved; moreover, the oil-proof wrapping paper prepared by the preparation method provided by the invention needs not be coated or waxed, so that the environmental protection performance, the safety, the oil-proof efficiency and the strength of the oil-proof wrapping paper are improved, and the application range is expanded.

Application Domain

Technology Topic

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  • Oil-proof wrapping paper and preparation method thereof

Examples

  • Experimental program(3)
  • Effect test(1)

Example Embodiment

[0043] Example 1
[0044] The method for preparing oil-proof packaging paper of this embodiment includes the following steps:
[0045] (1) Preparation of oil-proof plant microfibrils
[0046] At room temperature, add 50kg of fluorobenzoyl chloride, 50kg of dimethylformamide, and 50kg of plant fiber microfibrils into the reactor successively, stir and mix evenly, heat to 70°C, and stir for 2h at 70°C; react; After the end, cool to room temperature, filter the product to remove excess solvent, and then wash with dichloromethane twice, then with ethanol twice, take it out after washing, and dry at 60°C for 24h to obtain oil-proof vegetable microfiber Silk; wherein: the diameter of the plant fiber microfibrils is 5-10um, and the length is 200-400um.
[0047] (2) A method for preparing oil-resistant (modified) nano cellulose, the method includes the following steps:
[0048] At room temperature, sequentially add 1000g of fluorobenzoyl chloride, 750g of dimethylformamide, and 250g of nano-cellulose crystals into the reactor, stir and mix uniformly, heat to 70°C, and stir at 70°C for 3h; the reaction is over After cooling to room temperature, the resulting precipitate was centrifuged at 8000r/min for 25min and concentrated to remove excess solvent. The centrifuged product was washed twice with dichloromethane, and then washed twice with ethanol, and then centrifuged. Separate for 15 minutes to obtain the oil-resistant nano cellulose;
[0049] Wherein: the diameter of the nano cellulose crystal is 5-60 nm, and the length is 100-250 nm.
[0050] (3) Preparation of oil-proof sizing solution
[0051] Add 250kg of modified starch to the dissolving tank, add water, stir, and heat to completely dissolve the modified starch solution, then transfer the modified starch solution to the mixing tank, and take 0.5kg. Step (2) The prepared oil-repellent nano cellulose and 10 kg of dissolved chitosan are respectively added to the modified starch liquid to prepare an oil-repellent sizing liquid, wherein the solid content of the oil-repellent sizing liquid is 10%.
[0052] (4) Preparation of oil-proof paper pulp
[0053] After the softwood pulp and hardwood pulp are processed by hydraulic pulper, slag remover, pressure screen, etc., the softwood pulp is beaten to 35~40°SR with a double disc mill, and the hardwood pulp is beaten to 35~40°SR, ready for use; then the softwood pulp, hardwood pulp, and the oil-proof plant microfibrils prepared in step (1) are mixed uniformly at a mass ratio of 1:1.5:0.05 to obtain a Oil paper pulp.
[0054] (5) Preparation of oil-proof wrapping paper
[0055] Put the oil-proof paper pulp prepared in step (4) in the pulping tank, after passing through the flow system, it is formed and copied on the net at a concentration of 0.5%. After the wet paper is pressed and dried, the surface coating step (3) The prepared oil-proof sizing liquid, the ratio of the amount of the oil-proof sizing liquid to the mass of the paper fiber is 0.05:1, and the oil-proof packaging paper is prepared after drying and calendering. The weight of the oil-proof packaging paper is 60g/m 2.

Example Embodiment

[0056] Example 2
[0057] The method for preparing oil-proof packaging paper of this embodiment includes the following steps:
[0058] (1) Preparation of oil-proof plant microfibrils
[0059] At room temperature, sequentially add 25kg fluorobenzoyl chloride, 50kg dimethylformamide, and 50kg plant fiber microfibrils into the reactor, stir and mix evenly, heat to 80°C, and stir at 80°C for 1h reaction; After finishing, cool to room temperature, filter the product to remove excess solvent, then wash 4 times with dichloromethane, and 4 times with ethanol. After washing, take it out and dry it at 60℃ for 24h to obtain oil-proof vegetable microfiber Silk; wherein: the diameter of the plant fiber microfibrils is 5-10um, and the length is 200-400um.
[0060] (2) Preparation of oil-proof nano cellulose
[0061] At room temperature, 500g of fluorobenzoyl chloride, 500g of dimethylformamide, and 250g of nano-cellulose crystals were added to the reactor in turn, stirred and mixed uniformly, heated to 75°C, and stirred at 75°C for 4h; the reaction was over After cooling to room temperature, the resulting precipitate was centrifuged at 10000r/min for 20min and concentrated to remove the excess solvent. The centrifuged product was washed with dichloromethane 3 times, then washed with ethanol 3 times, and then centrifuged Separate for 20 minutes to obtain the oil-resistant nano cellulose;
[0062] Wherein: the diameter of the nano cellulose crystal is 5-60 nm, and the length is 100-250 nm.
[0063] (3) Preparation of oil-proof sizing solution
[0064] Add 500kg of modified starch to the dissolving tank, add water, stir, and heat to completely dissolve the modified starch solution, then transfer the modified starch solution to the mixing tank, and take 0.5kg. Step (2) The prepared oil-proof nano cellulose and 25 kg of dissolved chitosan are respectively added to the modified starch liquid to prepare an oil-proof sizing liquid, wherein the solid content of the oil-proof sizing liquid is 8%.
[0065] (4) Preparation of oil-proof paper pulp
[0066] After the softwood pulp and hardwood pulp are processed by hydraulic pulper, slag remover, pressure screen, etc., the softwood pulp is beaten to 35~40°SR with a double disc mill, and the hardwood pulp is beaten to 35~40°SR, ready for use; then the softwood pulp, hardwood pulp, and the oil-proof plant microfibrils prepared in step (1) are mixed uniformly at a mass ratio of 1:1:0.08 to obtain a Oil paper pulp.
[0067] (5) Preparation of oil-proof wrapping paper
[0068] Put the oil-proof paper pulp prepared in step (4) in the pulping tank, after passing through the flow system, it is formed and copied on the net at a concentration of 0.5%. After the wet paper is pressed and dried, the surface coating step (3) The prepared oil-proof sizing liquid, the ratio of the amount of the oil-proof sizing liquid to the mass of the paper fiber is 0.05:1, and the oil-proof packaging paper is prepared after drying and calendering. The weight of the oil-proof packaging paper is 40g/m 2.

Example Embodiment

[0069] Example 3
[0070] The preparation method of oil-proof packaging paper of this embodiment includes the following steps:
[0071] (1) Preparation of oil-proof plant microfibrils
[0072] At room temperature, sequentially add 50kg of fluorobenzoyl chloride, 100kg of dimethylformamide, and 50kg of plant fiber microfibrils into the reactor, stir and mix evenly, heat to 75°C, and stir for 1.5h at 75°C; After the reaction, cool to room temperature, filter the product, remove excess solvent, and then wash 5 times with dichloromethane, then 5 times with ethanol, take out and dry at 60°C for 24 hours to obtain oil-proof plant microfibrils; : The plant fiber microfibrils have a diameter of 5-10um and a length of 200-400um.
[0073] (2) Preparation of oil-proof nano cellulose
[0074] At room temperature, 750g of fluorobenzoyl chloride, 500g of dimethylformamide, and 250g of nano-cellulose crystals were sequentially added to the reactor, stirred and mixed uniformly, heated to 80°C, and stirred at 80°C for 3.5h; reaction; After the end, cool to room temperature, centrifuge the formed precipitate at 12000r/min for 15min and concentrate, remove the excess solvent, wash the product after centrifugation with dichloromethane 5 times, then wash with ethanol 5 times, and then Centrifugal separation for 25 minutes to obtain the oil-resistant nano cellulose;
[0075] Wherein: the diameter of the nano cellulose crystal is 5-60 nm, and the length is 100-250 nm.
[0076] (3) Preparation of oil-proof sizing solution
[0077] Dissolve 400kg of modified starch with water in a dissolving tank to heat and dissolve the starch solution, and place it in a mixing tank. Take 0.5kg of the oil-resistant nanocellulose prepared in step (2) and 15kg of dissolved chitosan and add separately The oil-proof sizing liquid is prepared in the modified starch liquid, wherein the solid content of the oil-proof sizing liquid is 5%.
[0078] (4) Preparation of oil-proof paper pulp
[0079] After the softwood pulp and hardwood pulp are processed by hydraulic pulper, slag remover, pressure screen, etc., the softwood pulp is beaten to 35~40°SR with a double disc mill, and the hardwood pulp is beaten to 35~40°SR, ready for use; then the softwood pulp, hardwood pulp, and the oil-proof plant microfibrils prepared in step (1) are mixed uniformly at a mass ratio of 1:2:0.1 to prepare a Oil paper pulp.
[0080] (5) Preparation of oil-proof wrapping paper
[0081] Put the oil-proof paper pulp prepared in step (4) in the pulping tank, after passing through the flow system, it is formed and copied on the net at a concentration of 0.5%. After the wet paper is pressed and dried, the surface coating step (3) The prepared oil-proof sizing liquid, the ratio of the amount of the oil-proof sizing liquid to the mass of the paper fiber is 0.05:1, and the oil-proof packaging paper is prepared after drying and calendering. The weight of the obtained oil-proof packaging paper is 50g/m 2.
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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PUM

PropertyMeasurementUnit
Diameter5.0 ~ 10.0µm
Diameter5.0 ~ 60.0nm
Length100.0 ~ 250.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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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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