CN102115955B - Environment-friendly collagen fiber leather substrate and production method thereof - Google Patents
Environment-friendly collagen fiber leather substrate and production method thereof Download PDFInfo
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Abstract
At present, researchers do the research of reasonable utilization of chrome-containing leather shavings all the time; however, the leather shavings of leather making enterprises are difficult to treat in batch. The invention provides an environment-friendly collagen fiber leather substrate which is characterized by comprising an intermediate-layer fiber web, a surface-layer fiber web tightly connected on the upper surface of the intermediate-layer fiber web, and a bottom-layer fiber web tightly connected on the lower surface of the intermediate-layer fiber web, wherein the surface-layer fiber web and the bottom-layer fiber web respectively comprise the components by mass percentage of: 90 to 97 percent of collagen fibers, 3 to 10 percent of polylactic acid bi-component fibers; the intermediate-layer fiber web is made of polylactic acid bi-component fibers; the weight of the surface-layer fiber web and the weight of the bottom-layer fiber web are both 30 to 150 grams per square meter; and the weight of the intermediate-layer fiber web is 10 to 30 grams per square meter. The non-woven synthetic leather substrate prepared by using collagen fiber extracted from leather leftovers has good simulation performance, avoids secondary pollution to the environment, and is beneficial to the follow-up coating of PU (polyurethane).
Description
Technical field
The present invention relates to clothes and spin the synthetic leather base cloth that industry is used, particularly a kind of environment-friendly type collagenous fibres leather base cloth with family.
Background technology
Traditional leather industry is to be base stock with the animal skins, and the final finished that is made into only accounts for former tare weight about 50%, and other are a large amount of solid waste.China is as process hides big country; The annual leather corner discarded object (is main to contain the chromium leather castoff) that produces more than 140 ten thousand tons approximately almost accounts for 1/2nd of the world, and this is because China leather-making enterprises is mainly used the blue skin technology of sheet; Therefore it is higher to contain the ratio that the chromium leftover bits and pieces accounts for; Thereby when existing curriery and develop rapidly, tanning waste quantity makes the leather industry of China be faced with the severe challenge of sustainable development and the problem of environmental pollution that is on the rise also in ever-increasing phenomenon.In these solid waste except a spot of hair, meat slag; Major part is skin limit and the scurf that produces in the processes such as blue skin deburring, shaving; Its main component is the fibre bundle aggregate that type i collagen albumen constitutes; As do not add abandoning of utilization, be one of most important factor that produces the leather industry pollution.
About recycling existing history quite of a specified duration from containing chrome leather discarded object extraction collagen fabric; See that from the great mass of data of consulting existing research mainly contains three kinds of physics method, physical-chemical method and chemical methods: early work is leather bits to be pulverized mix the manufacturing regenerated leather with adhesive in physics method and the physical-chemical method.In recent years; Adopt physical-chemical method to extract collagenous fibres and cooperates the research of the paper of manufacturing paper with pulp more with string, comprise and extract that collagenous fibres form, animal and plant fiber mixing copy that chip architecture reaches and [Fu Lihong, Zhang Mingrang such as bonding mechanism from the chrome leather discarded object; Qi Yongqin etc.; China's papermaking journal, 2002,17 (1): 68-71; Li Jia, Chen Gang, Wu Zhenguo etc., leather science and engineering, 2006,16 (4): 18-23; Sun Youchang, Zhao Chuanshan, Zhang Kun, Chinese leather, 2007,36 (17): 33-35].
Since after the tanning in the wet blue between collagenous fibres bonding firm; Conventional method is difficult to isolate filament; Therefore adopt pulverizer handled leather bits, it is separated to make collagenous fibres form the pencil particle, and people such as Hamu adopt grinder to handle chrome shavinge; To the screening that makes an experiment of leather bits water capacity, dry grinding speed and dynamic and static cutter spacer, the collagenous fibres of extraction are used for papermaking.This method obtains average fiber length all less than 3mm through pulverize separating, and leather bits utilization rate is no more than 15% joining when copying, otherwise can causes the powerful reduction of paper; Therefore, this respect for widely applying leather bits fiber also to need the more exploration and research [Hamu, Shiyouj more; Morikawa and Isao Takeuchi; Tanned leather waste fiber, its production, regenerated base paper for leather paper using the same fiber and regenerated leather paper; JP10273817,1998-10-13].
Aspect waste recycling; Jiang Sujie; Luiz etc. have all carried out system research to chrome leather scrap (collagenous fibres particle powder) to the characterization of adsorption of dyestuff, auxiliary agent in the water body, though explain the adsorption mechanism of dyestuff and auxiliary agent differently, the leather bits all have absorption property [C.A.Luiz in various degree to organic matter in the water body; Oliveiraa; Mara í sa
et al., Solid waste from leather industry as adsorbent of organic dyes in aqueous-medium, Journal of Hazardous Materials; 2007,141 (6): 344-347; Jiang Sujie, Zhang Mina, Wu Hui, Liao Xuepin etc. contain the chromium leather leftover to organic characterization of adsorption in the water body, Chinese leather, 2007,36 (21): 9-12; Diana Q.L.; Oliveiraa, Mara í sa
, Luiz C.A.et al.; Removal of As (V) and Cr (VI) from aqueous solutions using solid waste from leather industry; Journal of Hazardous Materials, 2008,151 (1): 280-284]; This method is a large amount of good approach that utilize the leather bits, but adsorbs the problem that saturated leather bits also face after-treatment.
The applied chemistry method is more from the research that the chrome leather discarded object extracts the collagen product, comprises acid system, alkaline process, enzyme process and oxidizing process [Dong Guiping, Lan Yunjun; Bao Lihong, the road of the greenization technology of leather--the recycling of chrome tanning discarded object, western leather; 2006,28 (4): 12-17].People such as Langmaier study the possibility of extracting the collagen product and being used to prepare Lauxite; Dimethylol urea condensation polymer, urea and enzymolysis leather bits collagen product are carried out blend, do not add acid curing agent, adopt DSC and TG to analyze and find that formaldehyde emission is greatly reduced in the Lauxite cured film; He also utilizes dialdehyde stareh enzyme and the reaction of chrome leather discarded object to produce degradable water gel protein film; Through the ratio of experimental design adjustment protein hydrolysate product with dialdehyde stareh enzyme content, discovery can obtain Thermoreversibly crosslinked property aquogel protein film when protein and dialdehyde stareh enzyme content during respectively at 25～30% and 15～20% (w/w); When the dialdehyde stareh enzyme dosage surpasses 20%; Protein film only has part reversible crosslink property [F.Langmaier, J.ivarov á, M.Ml á dek1 and K.Kolomazn; Curing adhesives of urea-formaldehyde type with collagen hydrolysates of chrome-tanned leather waste; Journal of Thermal Analysis and Calorimetry, 2004,75 (1): 206-215; F.Langmaier, P.Mokrejsa, K.Kolomaznika and M.Mladeka; Biodegradable packing materials from hydrolysates of collagen waste proteins; Waste Management, 2008,28 (3): 549-556]; In addition, people such as Alexy have carried out exploitative experiment research to PVA and the mixed film of chrome shavinge protein hydrolysate product, adopt glycerine as plasticizer; Application of DO E test method is done optimization to each set of dispense ratio of mixed solution; To its melt index, stretching property and heat endurance have carried out characterizing [P.Alexy, D.Bako, S.Hanzelov á et al. by force; Poly (vinyl alcohol)-collagen hydrolysate thermoplastic blends:I.Experimental design optimisation and biodegradation behaviour; Polymer Testing, 2003,22 (7): 801-809].Domestic aspect; Employing alkali such as Wang Kunyu and two kinds of methods of enzyme have been carried out experimental study to extracting collagen polypeptide from chrome shavinge, show that there are to a certain degree influence [Wang Kunyu, Zhang Mingrang alkali and enzyme dosage, operative temperature and time to putting forward glue rate and quality; Extract the research of edible gelatin and collagen polypeptide with chrome shavinge; Sichuan food and fermentation, 2000,3:38-43]; Chen Chi etc. analyze chrome shavinge oxidation dechroming principle, are optimized experiment to extracting Collagen material, and filter out optimum oxidation and take off chromium process condition [Chen Chi; But Wei Hua etc., the research of chrome leather scrap oxidation dechroming, leather science and engineering; 2006,16 (2): 22-25]; Wang Hongru etc. have analyzed the principle of chrome shavinge basic hydrolysis separation and Extraction collagen product, separation course and condition studied, and be the more effective a kind of method [Wang Hongru of separate chromium and collagen through a large amount of experiments and analysis explanation alkali hydrolysis method; Lou Jianxin, stingy little beautiful, Pang Zengrui; The discussion of Several Key Problems during the leather leftover recycling treatment is utilized; Shaanxi Tech Univ's journal: natural science edition, 2004,22 (3): 45-49].
In a word, because chemical method is in the laboratory, to carry out flexible and convenient operation; Thereby all obtain better effects for containing the chromium offal treatment in theory, but in practical application, the product that chemical method supported often can not get fine popularization; Main cause is to have complex disposal process, have secondary pollution and remove from office the low problem of bits utilization rate; Thereby make that the researcher makes a search in the reasonable utilization to chrome leather scrap always for many years, but the leather of leather-making enterprises bits still are difficult to obtain in batches processing, therefore from leather castoff, extract the collagenous fibres of appropriate length; Produce high value added product; Reach the purpose that utilization in enormous quantities contains the chromium leather castoff, and environment is not caused pollution for the second time, extremely important.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists; Provide a kind of and extract the nonwoven synthetic leather base cloth that collagenous fibres are processed with good simulation performance from tanning leftover; Pollute to avoid environment caused for the second time, and be beneficial to follow-up PU and cover with paint, lacquer, colour wash, etc. processing.
For this reason; The present invention adopts following technical scheme: a kind of environment-friendly type collagenous fibres leather base cloth is characterized in that the bottom fibre web that it by the intermediate layer fibre web, closely is connected the top layer fibre web of intermediate layer fibre web upper surface and closely is connected intermediate layer fibre web lower surface constitutes; Wherein, the material of top layer fibre web and bottom fibre web is formed and mass percent is: collagenous fibres 90-97%, and PLA bicomponent fiber 3-10%, the length of collagenous fibres is 1-3mm, the material of intermediate layer fibre web is the PLA bicomponent fiber; The weight of top layer fibre web and bottom fibre web be 30-150 gram/square metre; The weight of intermediate layer fibre web be 10-30 gram/square metre; The thickness of collagenous fibres leather base cloth is 1-3mm, and described collagenous fibres utilize Leather Factory's wet blue leftover bits and pieces to shear through the leather processor and process.The intermediate layer fibre web only plays the skeleton supporting role, and top layer fibre web and bottom fibre web affect the performance of final collagen fabric leather base cloth as main fibre.Described PLA bicomponent fiber is a skin-core structure, and the cortex fusing point is 70-90 ℃, and the sandwich layer fusing point is 130-150 ℃, and length is 5-10mm.
Another object of the present invention is to provide above-mentioned collagenous fibres leather base cloth production method; Its step is following: with the forming method of above-mentioned fiber with wet nonwoven fabrics; Adopt three to become the net systems, be processed to form simultaneously have the top layer fibre web, the sandwiched type structure of intermediate layer fibre web and bottom fibre web; Fibre web with above-mentioned sandwiched type structure carries out preliminary drying and bakes then; Fibre web after will baking at last is hot pressed into the fine and smooth collagenous fibres leather base cloth in surface through roller.Through after baking, the cortex generation fusion of 85% left and right sides PLA bicomponent fiber closely links together the collagenous fibres in top layer fibre web and the bottom fibre web in the fibre web, forms to have the fibre web of well taking intensity.During roller hot pressing, one side compresses, the compacting fibre web, makes the further fusion of PLA bicomponent fiber cortex that remains not fusion on the other hand, increases the intensity of fibre web.The present invention is a kind of solid waste of utilizing, the method for low-cost production high value added product.
Intermediate layer of the present invention fibre web is in dry (preliminary drying with bake) and roller hot pressing; The cortex generation fusion of PLA bicomponent fiber and the collagenous fibres in top layer fibre web and the bottom fibre web are closely linked together; Because used PLA bicomponent fiber is longer; Thereby the PLA fibre web that obtains (being the intermediate layer fibre web) has preferably powerfully, in whole base material, plays the skeleton supporting role; The hydrogen bonded power, the adhesive effect of PLA bicomponent fiber and the thermal pressure of extraneous roller that produce when the hygrometric state by means of collagenous fibres, and closely be connected the upper and lower layer of intermediate layer fibre web, form fine and close top layer fibre web and bottom fibre web respectively.
Described preliminary drying temperature is 90～120 ℃, and the preliminary drying time is 1-2 minute; Baking temperature is 130-160 ℃, and the time of baking is 0.5-1 minute.
The surface temperature control of said roller is at 80-150 ℃, and linear pressure is 2-20 ton/rice, speed of production be 5-20 rice/minute.Because institute's applied pressure is bigger, temperature is higher, and intermediate layer fibre web PLA fiber all is embedded between the collagenous fibres of top layer fibre web, bottom fibre web, and outward appearance almost can't see the white PLA fiber of intermediate layer fibre web.Integral material seems all to be made up of collagenous fibres, thereby simulated effect is good.In addition, because the occupancy volume of collagenous fibres has reached about 90% in the manufactured goods, thereby the performance of integral material approaches the corium base cloth.
The beneficial effect that the present invention has:
1, tannery's wet blue leftover bits and pieces is processed the ultrashort collagenous fibres of 1-3mm length, this process adopts the method for physical mechanical, can not produce trivalent chromium and change environmentally safe to toxic hexavalent chromium; And high to wet blue leftover bits and pieces utilization rate, reach about 90%.
2, the ultrashort collagenous fibres (its length of ultrashort finger is 1-3mm) to PLA bicomponent fiber and extraction form three-layer network simultaneously through the wet-laying method; Slurrying with become network process; Collagenous fibres are one through the hydrogen bond bonding; Utilize further bonding ultrashort collagenous fibres of PLA bicomponent fiber simultaneously, after oven dry, become the fibre web with better brute force, the method through high temperature, high pressure hot rolling firmly connects the finished leather scrim material with ultrashort collagenous fibres at last.
3, product appearance can't see white PLA fiber fully, and product appearance is made up of collagenous fibres fully, and performance and feel are similar to corium leather base cloth; Not only have good brute force, and ventilative, poisture-penetrability is good, soft; Outward appearance is fine and smooth, is beneficial to follow-up PU covering with paint and is processed into the collagenous fibres leather.
4, owing to extract ultrashort collagenous fibres and prepare in the process of three layers of fibre web and do not use any adhesive; Whole process of production can not cause secondary pollution to environment; Owing to adopt the PLA bicomponent fiber as bonding medium; Product can be degraded after with old abandoning fully, therefore can be used as clothes and family and spins industry with the leather base cloth, has good application prospects and environmental protection performance.
Below in conjunction with specific embodiment the present invention is described further.
The specific embodiment
The technological process of production of collagenous fibres of the present invention leather basal plane is: tannery's wet blue leftover bits and pieces screening → leather processor shearing, sub-sieve and the ultrashort collagenous fibres of extraction → ultrashort collagenous fibres and PLA bicomponent fiber slurrying respectively → three-layer network curtain are become net → preliminary drying → bake → roller hot pressing → rolling → finished product simultaneously.
Embodiment 1
Filter out similar ox-hide shaving bits bar from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 1mm, fineness scope are the ultrashort collagenous fibres of 24-32 μ m; With 95% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 5mm, and wherein PLA bicomponent fiber usage ratio is 5%, is the independent slurrying of PLA bicomponent fiber of 5mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Table, bottom are the PLA bicomponent fiber mixture of 95% ultrashort collagenous fibres and 5%, and the weight of table, bottom is respectively 70 gram/square meters, 50 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 10 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 90 ℃ of preliminary drying temperature, 1 minute preliminary drying time, 135 ℃ of baking temperatures; Bake 0.6 minute time, again through roller hot pressing, heat pressing process is 90 ℃ for the roller surface temperature, and linear pressure is 3 tons/meter; Speed of production is 5 meters/minute, at last through cutting edge winding shaping.
YG461E type gurley permeameter is adopted in the gas permeability test, tests according to standard GB/T5453-1997.Select nozzle diameter 10mm for use, recording ultrashort collagenous fibres leather base cloth air penetrability is 186.6 (L/ (m2.s)).
LCK-131 vapor transfer rate analyzer is adopted in the poisture-penetrability test, tests according to standard GB/T 12704.2-2009.Test cloth specimen diameter is 70mm, and recording ultrashort collagenous fibres leather base cloth vapor transfer rate is 2559.89 (g/m2.d).
YG (B) 026H type imported electronic fabric strength tester is adopted in the tensile strength test; GB/T3923.1-1997 tests according to standard; Test cloth specimen specification is 50mm*350mm, and recording ultrashort collagenous fibres leather base cloth warp-wise ultimate strength is 201.30 (N/5cm), and the broadwise ultimate strength is 219.80 (N/5cm).
The trapezoidal tear strength test adopts YG (B) 026H type imported electronic fabric strength tester; GB/T3917.3-1997 tests according to standard; Test cloth specimen specification is 75mm * 150mm, and recording ultrashort collagenous fibres leather base cloth warp-wise, to tear brute force be 47.11 (N), and it is 56.32 (N) that broadwise is torn brute force.
Embodiment 2
Filter out the similar pigskin of fritter from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 2mm, fineness scope are the ultrashort collagenous fibres of 30-42 μ m; With 90% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 8mm, and wherein PLA bicomponent fiber usage ratio is 10%, is the independent slurrying of PLA bicomponent fiber of 5mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Table, bottom are the PLA bicomponent fiber mixture of 90% ultrashort collagenous fibres and 10%, and table, bottom weight are respectively 100 gram/square meters, 80 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 15 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 90 ℃ of preliminary drying temperature, 1.2 minutes preliminary drying time; 140 ℃ of baking temperatures bake 0.6 minute time, again through roller hot pressing; Heat pressing process is 100 ℃ for the roller surface temperature, and linear pressure is 5 tons/meter, and speed of production is 5 meters/minute; At last through cutting edge winding shaping.
Collagenous fibres leather base cloth warp-wise ultimate strength after test hot pressing is 298.5 (N/5cm), and the broadwise ultimate strength is 259.6 (N/5cm).
Warp-wise trapezoidal tear brute force is 68.32 (N), and broadwise trapezoidal tear brute force is 70.23 (N).
Vapor transfer rate is 2156.36 (g/m2.d), and Air permenbility is 125.12 (L/ (m2.s)).
Embodiment 3
Filter out similar pigskin shaving bits from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 1mm, fineness scope are the ultrashort collagenous fibres of 35-45 μ m; With 94% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 6mm, and wherein PLA bicomponent fiber usage ratio is 6%, is the independent slurrying of PLA bicomponent fiber of 6mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Upper and lower layer is the PLA bicomponent fiber mixture of 94% ultrashort collagenous fibres and 6%, and upper and lower layer weight is respectively 120 gram/square meters, 80 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 10 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 100 ℃ of preliminary drying temperature, 1 minute preliminary drying time; 145 ℃ of baking temperatures bake 0.8 minute time, again through roller hot pressing; Heat pressing process is 150 ℃ for the roller surface temperature, and linear pressure is 5 tons/meter, and speed of production is 10 meters/minute; At last through cutting edge winding shaping.
Collagenous fibres leather base cloth warp-wise ultimate strength after test hot pressing is 326.5 (N/5cm), and the broadwise ultimate strength is 317.81 (N/5cm).
Warp-wise trapezoidal tear brute force is 71.5 (N), and broadwise trapezoidal tear brute force is 79.5 (N).Vapor transfer rate is 1986.36 (g/m2.d), and Air permenbility is 108.96 (L/ (m2.s)).
Embodiment 4
Filter out similar ox-hide shaving bits from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 3mm, fineness scope are the ultrashort collagenous fibres of 30-50 μ m; With 90% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 6mm, and wherein PLA bicomponent fiber usage ratio is 10%, is the independent slurrying of PLA bicomponent fiber of 10mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Upper and lower layer is the PLA bicomponent fiber mixture of 90% ultrashort collagenous fibres and 10%, and upper and lower layer weight is respectively 150 gram/square meters, 100 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 15 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 120 ℃ of preliminary drying temperature, 1.8 minutes preliminary drying time; 150 ℃ of baking temperatures bake 1 minute time, again through roller hot pressing; Heat pressing process is 150 ℃ for the roller surface temperature, and linear pressure is 10 tons/meter, and speed of production is 20 meters/minute; At last through cutting edge winding shaping.
Collagenous fibres leather base cloth warp-wise ultimate strength after test hot pressing is 398.63 (N/5cm), and the broadwise ultimate strength is 389.1 (N/5cm).
Warp-wise trapezoidal tear brute force is 90.1 (N), and broadwise trapezoidal tear brute force is 95.1 (N).
Vapor transfer rate is 1523.56 (g/m2.d), and Air permenbility is 98.63 (L/ (m2.s)).
Embodiment 5
Filter out similar fritter pigskin waste material from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 1mm, fineness scope are the ultrashort collagenous fibres of 25-38 μ m; With 92% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 5mm, and wherein PLA bicomponent fiber usage ratio is 8%, is the independent slurrying of PLA bicomponent fiber of 8mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Table, bottom are the PLA bicomponent fiber mixture of 92% ultrashort collagenous fibres and 8%, and table, bottom weight are respectively 60 gram/square meters, 40 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 10 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 90 ℃ of preliminary drying temperature, 1.2 minutes preliminary drying time; 130 ℃ of baking temperatures bake 0.8 minute time, again through roller hot pressing; Heat pressing process is 90 ℃ for the roller surface temperature, and linear pressure is 2 tons/meter, and speed of production is 5 meters/minute; At last through cutting edge winding shaping.
Collagenous fibres leather base cloth warp-wise ultimate strength after test hot pressing is 186.35 (N/5cm), and the broadwise ultimate strength is 193.52 (N/5cm).
Warp-wise trapezoidal tear brute force is 42.36 (N), and broadwise trapezoidal tear brute force is 51.36 (N).
Vapor transfer rate is 3215.66 (g/m2.d), and Air permenbility is 201.36 (L/ (m2.s)).
Embodiment 6
Filter out similar ox-hide shaving bits bar from tannery's wet blue leftover bits and pieces; Shear through the leather processor that to be processed into average length be that 2mm, fineness scope are the ultrashort collagenous fibres of 24-36 μ m; With 95% ultrashort collagenous fibres and length is the PLA bicomponent fiber mixed pulp of 5mm, and wherein PLA bicomponent fiber usage ratio is 5%, is the independent slurrying of PLA bicomponent fiber of 8mm simultaneously with length; Adopt three layers to become the net system to form three-layer network simultaneously then; Table, bottom are the PLA bicomponent fiber mixture of 95% ultrashort collagenous fibres and 5%, and table, bottom weight are respectively 80 gram/square meters, 60 gram/square meters; The intermediate layer is the 100%PLA bicomponent fiber, and weight is 15 gram/square meters.Three layers of fibre web are passed through preliminary dryings and bake 95 ℃ of preliminary drying temperature, 1 minute preliminary drying time, 135 ℃ of baking temperatures; Bake 0.8 minute time, again through roller hot pressing, heat pressing process is 95 ℃ for the roller surface temperature, and linear pressure is 4 tons/meter; Speed of production is 8 meters/minute, at last through cutting edge winding shaping.
Collagenous fibres leather base cloth warp-wise ultimate strength after test hot pressing is 219.01 (N/5cm), and the broadwise ultimate strength is 223.65 (N/5cm).
Warp-wise trapezoidal tear brute force is 53.45 (N), and broadwise trapezoidal tear brute force is 55.32 (N).
Vapor transfer rate is 456.85 (g/m2.d), and Air permenbility is 225.36 (L/ (m2.s)).
Claims (4)
1. environment-friendly type collagenous fibres leather base cloth is characterized in that the bottom fibre web that it by the intermediate layer fibre web, closely is connected the top layer fibre web of intermediate layer fibre web upper surface and closely is connected intermediate layer fibre web lower surface constitutes; Wherein, the material of top layer fibre web and bottom fibre web is formed and mass percent is: collagenous fibres 90-97%, and PLA bicomponent fiber 3-10%, the length of collagenous fibres is 1-3mm, the material of intermediate layer fibre web is the PLA bicomponent fiber; The weight of top layer fibre web and bottom fibre web be 30-150 gram/square metre; The weight of intermediate layer fibre web be 10-30 gram/square metre; The thickness of collagenous fibres leather base cloth is 1-3mm, and described collagenous fibres utilize Leather Factory's wet blue leftover bits and pieces to shear through the leather processor and process;
With the forming method of above-mentioned fiber with wet nonwoven fabrics, adopt three to become the net systems, be processed to form simultaneously have the top layer fibre web, the sandwiched type structure of intermediate layer fibre web and bottom fibre web; Fibre web with above-mentioned sandwiched type structure carries out preliminary drying and bakes then; Fibre web after will baking at last is hot pressed into the fine and smooth collagenous fibres leather base cloth in surface through roller.
2. environment-friendly type collagenous fibres leather base cloth according to claim 1 is characterized in that described PLA bicomponent fiber is a skin-core structure, and the cortex fusing point is 70-90 ℃, and the sandwich layer fusing point is 130-150 ℃, and length is 5-10mm.
3. environment-friendly type collagenous fibres leather base cloth according to claim 2 is characterized in that described preliminary drying temperature is 90～120 ℃, and the preliminary drying time is 1-2 minute; Baking temperature is 130-160 ℃, and the time of baking is 0.5-1 minute.
4. environment-friendly type collagenous fibres according to claim 2 leather base cloth, the surface temperature control that it is characterized in that said roller is at 80-150 ℃, linear pressure is 2-20 ton/rice, speed of production be 5-20 rice/minute.
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