A kind of preparation method of porous soft type synthetic paper
Technical field
The invention belongs to the composite organic-inorganic material production technical field, be specifically related to a kind of preparation method of porous soft type synthetic paper.
Background technology
Synthetic paper, the s-generation that is otherwise known as paper.It is to be main raw material with macromolecule resin and inorganic filler, processes the multi-functional matrix material that has plastics and paper characteristic simultaneously through expressing technique.Synthetic paper is a kind of plastics type material product, has that light specific gravity, intensity are big, anti tear, and printing is good, shading, Ginkgo Biloba Leaf Extract, characteristics such as durable in use.The production process of synthetic paper is of reduced contamination, is a major reform of modern paper production.Synthetic paper has writing property and the printing effect same with the vegetable fibre paper.The core capabilities that has more plastic packing article simultaneously and had is such as waterproof, protection against the tide, mildew-resistant, insect protected, wear-resisting, folding, fire-retardant etc.
Though synthetic paper is in comparatively environmental protection of whole process of production; But employed macromolecular material (is mainly polyolefins; Like Vilaterm, Vestolen PP 7052, SE etc.) need under the pyritous condition, (usually at 180 ℃) could realize secondary processing, so energy consumption is higher.In addition; In order to increase the printing ink absorption property of synthetic paper; Used a large amount of mineral filler-Paris whites in the synthetic paper, adopted again simultaneously to be squeezed into the comparatively densification of one-piece construction that membrane technique causes synthetic paper, this just makes prepared synthetic paper product exist feel hard partially; The ink marks infiltration is slow, problems such as ink marks length time of drying.Therefore, present synthetic paper product through the printing after, ink absorption is slow, needs operations such as airing mostly, to a certain degree limit its range of application.Can be found out that by above analysis present synthetic paper product mainly exists production energy consumption higher, the product one-piece construction is fine and close, feel is hard partially, and blotting waits shortcoming slowly.Therefore must improve the production technology of synthetic paper, could expand its Application Areas.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of porous soft type synthetic paper.This method comprises the step of following order:
The component that (1) will comprise 22~26 weight part vulcabond, 1600~4000 weight part polyester diol, 1000~3000 parts by weight solvent was reacted 3 hours down in 80 ℃ in reactor drum; Add 38~59 weight part chainextenders, 133~157 weight part vulcabond again and under 80 ℃, continue reaction 2 hours, obtain the heavy-gravity polyurethane soln then;
(2) then prepared polyurethane soln is cooled to 20~25 ℃; And adding certain amount of solvent, to be mixed with urethane solid masses content be 30% solution, adds the mineral filler of 146~789 weight parts again, stirred 1 hour; Mix, obtain mixing solutions;
(3) with the partially mixed solution coat of (2) step gained on separate-type paper, and send into and carry out drying in the baking oven, oven temperature is 70~110 ℃, treat film on the separate-type paper dry fully after, promptly obtained the base material of synthetic paper production usefulness;
(4) remainder of (2) step gained mixing solutions is coated on the base material of (3) step gained with certain thickness, is together immersed in the aqueous solution then, treat the mixing solutions completely solidified on top layer after; Send into immediately and carry out forced air drying in the baking oven; Oven temperature is 40~50 ℃, treat film on the separate-type paper dry fully after, the film on the separate-type paper is peeled off; According to demand membrane product is cut out again and be suitable dimension, promptly obtain porous soft type synthetic paper product; Total thickness through regulating the base material and the gauge control synthetic paper of the mixing solutions that applies for the second time is 0.07~0.25mm.
Further, said vulcabond is preferably: isoflurane chalcone diisocyanate and 4, at least a in the 4-dicyclohexyl methane diisocyanate.
Said polyester diol is preferably: at least a in polycaprolactone divalent alcohol, polyethylene glycol adipate glycol, the poly adipate succinic acid ester glycol, its number average relative molecular mass is 8000~20000.
Said solvent is at least a in N, the N,N-DIMETHYLACETAMIDE.
Said chainextender is preferably short-chain fat family divalent alcohol, as 1, and 4 '-butyleneglycol, 1,6-pinakon and 1, at least a in 3 '-Ucar 35.
Said mineral filler is at least a or mixture in light calcium carbonate, water-ground limestone, the calcene, and is that fineness is 500~1500 purpose powder.
In step (2) the gained solution, the ratio between urethane and the mineral filler can change in certain scope, is preferably: the quality percentage composition of urethane is 35%~55%, and the quality percentage composition of mineral filler is 45%~65%.
The synthetic paper outward appearance of preferred gained is a white in the inventive method, and thickness is between 0.07~0.25mm, and weight (with A4 paper planimeter) is between 0.95~2.10g.
The present invention compares with existing synthetic paper production technology, has following advantage:
(1) synthetic paper contains vesicular structure and comparatively soft: in the production process of synthetic paper, adopted the operation of the step immersion aqueous solution.In immersing aqueous solution process, solvent and water in the mixing solutions exchange, and make macromolecular material separate out, and film-forming has promptly been accomplished the film forming process of wet method phase inversion; Simultaneously, the inside on film top layer has formed vesicular structure, thereby gives comparatively soft characteristic of synthetic paper.
(2) ink marks quick permeation: the existence of a large amount of pore space structures in the synthetic paper top layer has promoted infiltration and the absorption rate of synthetic paper to ink greatly.Synthetic paper is after printing or writing, and the moisture content meeting rapid osmotic of ink is in the micropore of polyurethane material, and ink molecules also can be adsorbed by mineral filler fast simultaneously, thereby make ink marks rapid drying.
(3) production energy consumption is low: in process of production, need not under 180 ℃ condition, to carry out secondary processing, only need carry out drying operation at 70~110 ℃ and 40~50 ℃ and get final product, so energy consumption reduces greatly, help reducing the production cost of synthetic paper.
Embodiment
Come the present invention is described in further detail through concrete experiment embodiment below, wherein, said raw material is industrialization product, and equipment is the production unit of general industryization.
Embodiment 1:
Take by weighing 2.2 kilograms of isoflurane chalcone diisocyanates, 160 kilograms of polycaprolactone divalent alcohol (molecular weight is 8000), N double centner and put into reactor drum; Reacted 3 hours down in 80 ℃; Add 1 again; 13.3 kilograms of 3.8 kilograms of 3 '-Ucar 35, isoflurane chalcone diisocyanate continue reaction 2 hours down in 80 ℃, obtain the heavy-gravity polyurethane soln; Prepared polyurethane soln is cooled to 25 ℃, and adding 318.4 kilograms N, to be mixed with urethane solid masses content be 30% solution, adds 147 kilograms light calcium carbonate again, stirs and obtained mixing solutions in 1 hour; 80% of the mixing solutions total amount of gained is coated on the separate-type paper, and is sent into and carry out drying (oven temperature is 70 ℃) in the baking oven, treat film on the separate-type paper dry fully after, promptly obtained the base material of synthetic paper production usefulness; Remaining mixing solutions is coated with certain thickness (coating for the second time) on the base material of synthetic paper production usefulness; Together immerse in the aqueous solution; After treating the mixing solutions completely solidified on top layer; Send into immediately and carry out forced air drying (oven temperature is 40 ℃) in the baking oven, treat film on the separate-type paper dry fully after, the film on the separate-type paper is peeled off; Total thickness through regulating the base material and the gauge control film of the mixing solutions that applies for the second time is 0.07mm, according to demand membrane product is cut out at last to be suitable dimension, promptly obtains porous soft type synthetic paper product.
The quality percentage composition of the polyurethane material of gained synthetic paper is 45.0% in the present embodiment; Mineral filler quality percentage composition is 55.0%.The synthetic paper product colour is a white, and thickness is 0.07mm, and quality (with A4 paper planimeter) is 0.95g.
Embodiment 2:
Take by weighing 4; 2.6 kilograms of 4-dicyclohexyl methane diisocyanates, 400 kilograms of poly adipate succinic acid ester glycol (molecular weight is 20000), N,N-DIMETHYLACETAMIDE are put into reactor drum for 300 kilograms; Reacted 3 hours down in 80 ℃, add 5.9 kilograms of 1,6 '-pinakons, 4 again; 15.7 kilograms of 4-dicyclohexyl methane diisocyanates continue reaction 2 hours down in 80 ℃, obtain the heavy-gravity polyurethane soln; Then prepared polyurethane soln is cooled to 20 ℃, and adding 689.8 kilograms N,N-DIMETHYLACETAMIDE, to be mixed with urethane solid masses content be 30% solution, adds 787.8 kilograms water-ground limestone again, stirs and obtained mixing solutions in 1 hour; Then 70% of the mixing solutions total amount of gained is coated on the separate-type paper, and is sent into and carry out drying (oven temperature is 110 ℃) in the baking oven, treat film on the separate-type paper dry fully after, promptly obtained the base material of synthetic paper production usefulness; At last remaining mixing solutions is coated (coating for the second time) on the base material of synthetic paper production usefulness with certain thickness; Together immerse in the aqueous solution; After treating the mixing solutions completely solidified on top layer; Send into immediately and carry out forced air drying (oven temperature is 50 ℃) in the baking oven, treat film on the separate-type paper dry fully after, the film on the separate-type paper is peeled off; Total thickness through regulating the base material and the gauge control film of the mixing solutions that applies for the second time is 0.25mm, according to demand membrane product is cut out at last to be suitable dimension, promptly obtains porous soft type synthetic paper product.
The quality percentage composition of the polyurethane material of gained synthetic paper is 35.0% in the present embodiment; Mineral filler quality percentage composition is 65.0%.The synthetic paper product colour is a white, and thickness is 0.25mm, and quality (with A4 paper planimeter) is 2.10g.
Embodiment 3:
Take by weighing 4; 2.6 kilograms of 4-dicyclohexyl methane diisocyanates, polyethylene glycol adipate glycol 300 kilograms of (molecular weight is 15000), N,N-DIMETHYLACETAMIDEs are put into reactor drum for 200 kilograms; Reacted 3 hours down in 80 ℃; Add 1 again, 13.3 kilograms of 4.5 kilograms of 4 '-butyleneglycols, isoflurane chalcone diisocyanate continue reaction 2 hours down in 80 ℃, obtain the heavy-gravity polyurethane soln; Then prepared polyurethane soln is cooled to 22 ℃, and adding 547.6 kilograms N, to be mixed with urethane solid masses content be 30% solution, adds 480.6 kilograms calcene again, stirs and obtained mixing solutions in 1 hour; Then 80% of the mixing solutions total amount of gained is coated on the separate-type paper, and is sent into and carry out drying (oven temperature is 90 ℃) in the baking oven, treat film on the separate-type paper dry fully after, promptly obtained the base material of synthetic paper production usefulness; At last remaining mixing solutions is coated (coating for the second time) on the base material of synthetic paper production usefulness with certain thickness; Together immerse in the aqueous solution; After treating the mixing solutions completely solidified on top layer; Send into immediately and carry out forced air drying (oven temperature is 43 ℃) in the baking oven, treat film on the separate-type paper dry fully after, the film on the separate-type paper is peeled off; Total thickness through regulating the base material and the gauge control film of the mixing solutions that applies for the second time is 0.12mm, according to demand membrane product is cut out at last to be suitable dimension, promptly obtains porous soft type synthetic paper product.
The quality percentage composition of the polyurethane material of gained synthetic paper is 40.0% in the present embodiment; Mineral filler quality percentage composition is 60.0%.The synthetic paper product colour is a white, and thickness is 0.12mm, and quality (with A4 paper planimeter) is 1.40g.
Embodiment 4:
Take by weighing 2.2 kilograms of isoflurane chalcone diisocyanates, polyethylene glycol adipate glycol 340 kilograms of (molecular weight is 17000), N,N-DIMETHYLACETAMIDEs are put into reactor drum for 260 kilograms; Reacted 3 hours down in 80 ℃; Add 1 again; 4.5 kilograms of 4 '-butyleneglycols, 4,15.6 kilograms of 4-dicyclohexyl methane diisocyanates continue reaction 2 hours down in 80 ℃, obtain the heavy-gravity polyurethane soln; Then prepared polyurethane soln is cooled to 23 ℃; And it is 30% solution that the N that adds 585.4 kilograms is mixed with urethane solid masses content; Light calcium carbonate and 260.0 kilograms of stearic lime carbonate of adding 240.3 kilograms again stir and obtained mixing solutions in 1 hour; Then 80% of the mixing solutions total amount of gained is coated on the separate-type paper, and is sent into and carry out drying (oven temperature is 90 ℃) in the baking oven, treat film on the separate-type paper dry fully after, promptly obtained the base material of synthetic paper production usefulness; At last remaining mixing solutions is coated (coating for the second time) on the base material of synthetic paper production usefulness with certain thickness; Together immerse in the aqueous solution; After treating the mixing solutions completely solidified on top layer; Send into immediately and carry out forced air drying (oven temperature is 40 ℃) in the baking oven, treat film on the separate-type paper dry fully after, the film on the separate-type paper is peeled off; Total thickness through regulating the base material and the gauge control film of the mixing solutions that applies for the second time is 0.19mm, according to demand membrane product is cut out at last to be suitable dimension, promptly obtains porous soft type synthetic paper product.
The quality percentage composition of the polyurethane material of gained synthetic paper is 42.0% in the present embodiment; Mineral filler quality percentage composition is 58.0%.The synthetic paper product colour is a white, and thickness is 0.19mm, and quality (with A4 paper planimeter) is 1.70g.