Transparent paper and method for preparing same by repeatedly coating surface
A surface coating, transparent paper technology, applied in paper coatings, special paper, paper and other directions, can solve the problems of high cost, application limitation, cellulose crystal structure damage, etc., and achieve short production cycle, low cost and simple process. Effect
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[0031] Example 1
[0032] The method for rapid preparation of transparent paper by multiple coating method includes the following steps and process conditions:
[0033] (1) Papermaking of base paper: using hardwood dissolving pulp board as raw material, beating first, the beating degree is 40SR°, and then the beating pulp is made into base paper with a basis weight of 60g / m 2 ;
[0034] (2) Raw material drying: drying the base paper made in step (1) until the moisture content is lower than 2%;
[0035] (3) Coating process: the ionic liquid N-ethylimidazole hydrogen phosphite (EMIMMeOPO 2 H) Coating on the surface of the base paper dried in step (2). The loading amount of the ionic liquid on the surface of the base paper is 5g / m 2 ;
[0036] (4) The surface of the base paper is partially dissolved: the base paper coated in step (3) is placed on a continuous flat press at a temperature of 100°C and a pressure of 1 MPa for 10 minutes to fully swell and partially dissolve the plant fibers ...
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[0043] Example 2
[0044] The method for rapid preparation of transparent paper by multiple coating method includes the following steps and process conditions:
[0045] (1) Papermaking of base paper: using hardwood dissolving pulp board as raw material, beating first, the beating degree is 50SR°, and then the beating pulp is made into base paper with a basis weight of 50g / m 2 ;
[0046] (2) Raw material drying: drying the base paper made in step (1) until the moisture content is lower than 2%;
[0047] (3) Coating process: prepare NN dimethylacetamide / lithium chloride (DMAC / LiCl) solution with a ratio of 10:1, and spin coating to apply the prepared solution to step (2) Dry base paper surface. The loading amount of DMAC / LiCl solution on the surface of base paper is 20g / m 2 ;
[0048] (4) The surface of the base paper is partially dissolved: the base paper coated in step (3) is placed on a batch-type flat press at a temperature of 70℃ and a pressure of 5MPa for 30 minutes to fully swell...
Example Embodiment
[0053] Example 3
[0054] The method for rapid preparation of transparent paper by multiple coating method includes the following steps and process conditions:
[0055] (1) Papermaking of base paper: using hardwood dissolving pulp board as raw material, beating first, the beating degree is 60SR°, and then the beating pulp is made into base paper with a basis weight of 40g / m 2 ;
[0056] (2) Raw material drying: drying the base paper made in step (1) until the moisture content is lower than 2%;
[0057] (3) Coating process: the ionic liquid 1-allyl-3-hexylimidazole chloride (AHIMCl) is coated on the surface of the base paper dried in step (2) by curtain coating. The loading of ionic liquid on the surface of the base paper is 10g / m 2 ;
[0058] (4) The surface of the base paper is partially dissolved: the base paper coated in step (3) is placed on a continuous flat press at a temperature of 100°C and a pressure of 2 MPa for 5 minutes to fully swell and partially dissolve the plant fibers...
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