CN102409552B - Preparation method of environment-friendly foamed artificial leather - Google Patents
Preparation method of environment-friendly foamed artificial leather Download PDFInfo
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- CN102409552B CN102409552B CN201110259266.4A CN201110259266A CN102409552B CN 102409552 B CN102409552 B CN 102409552B CN 201110259266 A CN201110259266 A CN 201110259266A CN 102409552 B CN102409552 B CN 102409552B
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Abstract
The invention relates to a preparation method of environment-friendly foamed artificial leather. The method comprises: step A. preparation of waterborne polyurethane foaming slurry; step B. stirring before coating; step C. surface layer formation; step D. intermediate foaming layer formation; step E. bonding layer formation; step F. release paper removal; step G. post-treatment. According to the preparation method of environment-friendly foamed artificial leather in the invention, before coating, the waterborne polyurethane foaming slurry is kept in a stirring state so as to ensure the stability of bubbles in the waterborne polyurethane foaming slurry during coating. Thus, a finished product can has closer bubbles with more uniform distribution and more consistent size, and the product surface can be free of flaws like pits. After release paper removal, a semi-finished product is then subjected to subsequent treatment by a three-format processor and texture kneading treatment, so that the finished product has better genuine leather feel and handfeel.
Description
Technical field
The present invention relates to a kind of preparation method of foam leather, particularly a kind of applying waterborne polyurethane is prepared the preparation method of environment-friendly foaming artificial leather.
Background technology
Tradition foam leather is mainly foam polyvinyl chloride artificial leather, is mainly when polyvinyl chloride high temperature plastifies, and Celogen Az ADCF blowing agent pyrolytic wherein produces gas, and polyvinyl chloride is foamed, and is commonly called as PVC foaming.This foam process requires temperature more than 180～200 ℃, and polyvinyl chloride plasticizer used be mostly phthalic acid salt, and such plasticizer has certain injury to human body, in the REACH standard that European Union puts into effect to this existing restriction.
Separately having a class foam leather is solvent borne polyurethane foam leather, and this foam leather utilizes solvent-borne type PU resin to add blowing agent, foams.Solvent type polyurethane resin contains a large amount of organic solvents (dimethyl formamide DMF, butanone MEK, toluene TOL etc.), and this type of organic solvent not only endangers direct labor's health but also can pollute factory's surrounding environment.
The foam leather that above two kinds of methods are produced all exists the plasticizer and the organic solvent that human body are had to harm, and not environmental protection, brings injury to people's life health.
At present, there is utilizing the environment-friendly foaming artificial leather of environment-friendly water-based polyurethane production of resins, because waterborne polyurethane resin is take water as solvent, nontoxic without harm, and do not add any organic solvent in the whole production process of making foam leather yet, therefore without waste water, toxic emission, to health and ecological environment, can not work the mischief, reduced recycling equipment and energy resource consumption, be therefore the best alternative materials of solvent borne polyurethane foam leather and foam polyvinyl chloride artificial leather simultaneously.Chinese Patent Application No. 201010547902.9, patent name is " a kind of novel environment-friendly water-based PU leather ", disclose a kind of applying waterborne polyurethane resin and prepared the preparation method of environmental protection artificial leather, but the artificial leather intermediate layer that it makes is not waterborne polyurethane foaming layer, do not relate to the problem of waterborne polyurethane foaming yet.Chinese Patent Application No. 201010245381.1, patent name is " a kind of production method of synthetic leather and synthetic leather ", the production method that discloses the professional foaming machine foam production of a kind of use waterborne polyurethane foaming artificial leather, its production stage roughly please refer to shown in Fig. 1: 1, prepare waterborne polyurethane foaming slurry; 2, form surface layer; 3, form middle foaming layer; 4, form tack coat.Utilize the abscess of the middle foaming layer of the product of the method manufacture to be prone to phenomenon not of uniform size, skewness, and product surface easily produces and has the problems such as concave point flaw, and finished product is not carried out to deep processing, cause the phenomenons such as artificial leather product kishke feel is poor, feel is not good to exist.
Summary of the invention
It is evenly fine and closely woven, in the same size that technical problem to be solved by this invention is to provide a kind of abscess, and kishke feel is strong, the preparation method of the environment-friendly foaming artificial leather of good hand touch.
In order to solve the problems of the technologies described above, the preparation method of environment-friendly foaming artificial leather of the present invention, comprises the following steps:
Steps A, by the slurry that contains expansion type waterborne polyurethane resin and air mixed foaming, make waterborne polyurethane foaming slurry;
Step B, to coating before described waterborne polyurethane foaming slurry stir;
Step C, aqueous polyurethane fabric is coated on to release liners surface the dry surface layer that forms;
Step D, described waterborne polyurethane foaming slurry is coated on to described facing surface the dry middle foaming layer that forms;
Step e, aqueous polyurethane coating medium is coated on to described middle foaming layer surface forms tack coat, then base cloth is attached to described tie layer surface and tack coat is dried to processing;
Step F, removal release liners obtain semi-finished product;
Step G, described semi-finished product are processed by three editions, rear road processor, finishing agent is the aqueous solution of water-soluble silicon oil composition, rubs line half an hour after handling under 70 ℃ of conditions.
The preparation method of environment-friendly foaming artificial leather of the present invention, before waterborne polyurethane foaming slurry coating, make it in stirring, efficiently solve waterborne polyurethane foaming slurry easily causes the minute bubbles in slurry to be combined into air pocket after placement a period of time, and produce the problem of bubble precipitation, avoided the product cell size therefore causing to differ, local abscess is excessive and distribution of cells is uneven, product surface has the flaws such as concave point, has guaranteed the stability of the bubble of the waterborne polyurethane foaming slurry in coating process; Removing after release liners, semi-finished product are further processed and rubbed line processing through three editions, road processor later, making the kishke feel of finished product and feel better.
Therefore, compared with prior art, the beneficial effect having is in the present invention:
1, the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce the flaws such as concave point;
2, strong, the good hand touch of kishke feel.
Accompanying drawing explanation
Figure 1 shows that the preparation method's of existing environment-friendly foaming artificial leather flow chart.
Figure 2 shows that the preparation method's of environment-friendly foaming artificial leather of the present invention flow chart.
The specific embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
Shown in Fig. 2, the preparation method of environment-friendly foaming artificial leather of the present invention, comprises the following steps:
Steps A, prepare waterborne polyurethane foaming slurry: by the slurry that contains expansion type waterborne polyurethane resin and air mixed foaming, make waterborne polyurethane foaming slurry;
The composition of the slurry that contains expansion type waterborne polyurethane resin wherein, comprises: 100 parts of aqueous foaming polyurethane resins, 1～5 part of foam stabilizer, 0.5～2 part of water-based thickener, 0.5～5 part of foam stabilizer, 2～10 parts of aqueous color pastes, 5～10 parts, water, 1～30 part of filler.By above-mentioned raw materials, be mixed with after slurry, preferably with high speed dispersor, it stirred to foaming.This foaming process is physical mechanical foaming, in whipping process, need from slurry bottom, in slurry, to pass into air with tracheae, air and material are fully mixed, under the effect of the auxiliary agents such as foam stabilizer, foam stabilizer, improve number of bubbles in material, increase the volume of material, make evenly tiny minute bubbles of existence in material.Regulate the amount of auxiliary agent and the time of stirring, can control size, the uniformity of minute bubbles in the volume of waterborne polyurethane foaming slurry and material.Preferably, at room temperature foam, mixing time is 20～50 minutes, and mixing speed is 1000～1500 revs/min, and the viscosity of slurry is 5000～7000cps.In the present invention, with common high-speed dispersion equipment, prepare foamed slurry, and prepare foamed slurry without professional foaming machine equipment, can make to produce to drop into and reduce, reduce costs.
This blending process organic solvent-free adds, in the process of high-speed stirred, and also organic solvent-free volatilization, the workman's that can not stimulate production respiratory system, does not produce harm to human body,, to factory's environment around, does not meet ecological, environmental protective requirement.
Preferably, described aqueous foaming polyurethane resin is one or more of anion fat adoption ester type, polyether-type;
Preferably, described foam stabilizer is fatty acid amide surfactants;
Preferably, described water-based thickener is polyurethanes thickener or cellulose thickener;
Preferably, described foam stabilizer is fatty acid salt surfactant;
Preferably, described filler is precipitated calcium carbonate or wood powder.
Before step B, coating, stir: the described waterborne polyurethane foaming slurry before coating is stirred;
Wherein, described step B can be realized by following mode: the described waterborne polyurethane foaming slurry before using high speed dispersor to coating stirs, and mixing speed is 500～800 revs/min.
In existing preparation method, waterborne polyurethane foaming slurry (for example, on coating cloth deck and in reinforced process) before coating does not stir and directly applies, easily like this cause the minute bubbles in slurry to be combined into air pocket, and produce bubble precipitation, cause Air Bubble Size to differ, skewness, thus cause the cell size of product to differ, local abscess is excessive and distribution of cells is uneven, has reduced the physical property of product.In the present invention, before waterborne polyurethane foaming slurry coating, make it in stirring, efficiently solve waterborne polyurethane foaming slurry easily causes the minute bubbles in slurry to be combined into air pocket after placement a period of time, and produce the problem of bubble precipitation, avoided the product cell size therefore causing to differ, local abscess is excessive and distribution of cells is uneven, product surface has the flaws such as concave point, guaranteed the stability of the bubble of the waterborne polyurethane foaming slurry in coating process, make the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce the flaws such as concave point.
Step C, formation surface layer: aqueous polyurethane fabric is coated on to release liners surface the dry surface layer that forms;
Wherein, the composition of described aqueous polyurethane fabric comprises: 100 parts of waterborne polyurethane resins, 0.5～2 part of water-based thickener, 0.5～2 part of levelling agent, 2～20 parts of aqueous color pastes, 5～50 parts, water.Described release liners can be one or more in U.S.'s release liners, Britain's release liners, Japanese release liners, Italian release liners, for example, and the PXDH R-64BC-2 release liners that the 274# release liners that U.S. SAPPI produces, Japanese LINTEC produce.Described step C can be realized by following mode: aqueous polyurethane fabric is evenly coated with and is scraped on release liners surface with being coated with cutter, and coating weight is 50～150g/m, then at 120～150 ℃, dries 2～3 minutes.
Step D, formation middle foaming layer: described waterborne polyurethane foaming slurry is coated on to described facing surface the dry middle foaming layer that forms;
Wherein, described step D is realized by following mode: described waterborne polyurethane foaming slurry is evenly coated with and is scraped at described facing surface with being coated with cutter, and coating weight is 200～500g/m, then at 120～150 ℃, dries 2～3 minutes.
Step e, formation tack coat: aqueous polyurethane coating medium is coated on to described middle foaming layer surface and forms tack coat, then base cloth is attached to described tie layer surface and tack coat is dried to processing;
Wherein, the composition of described aqueous polyurethane coating medium comprises water-based polyurethane adhesive.Described base cloth can be one or more of nonwoven fabric, woven fabric or knitted cloth, is preferably woven fabric or knitted cloth.Described step e is realized by following mode: water-based polyurethane adhesive is evenly coated with and is scraped on described middle foaming layer surface with being coated with cutter, and coating weight is 100～150g/m, then base cloth is attached to described tie layer surface and at 140～160 ℃, dries 2～3 minutes.
Step F, removal release liners: remove release liners and obtain semi-finished product;
Described step F can adopt the conventional stripping off device of the industry to carry out, and what after release liners and described top layer are peeled off, obtain is semi-finished product.
Line half an hour is rubbed in step G, post processing: described semi-finished product are processed by three editions, rear road processor, and finishing agent is the aqueous solution of water-soluble silicon oil composition under 70 ℃ of conditions after handling.
Wherein, by be placed in temperature by three editions, rear road processor semi-finished product after treatment, be in the boarding machine of 70 ℃, rub line half an hour, under the pullling of rubbing process, the lines of surface of semi-finished is deepened more, block successful between lines, third dimension emersion, represent fully, exactly like corium.
To complete and rub line semi-finished product after treatment and be finished product from taking-up in boarding machine arrangement, rolling.
Adopt the preparation method of environment-friendly foaming artificial leather of the present invention, the environmental protection artificial leather product cell stabilization making, uniform and smooth, rebound performance is good, surface is without concave point flaw, and lines is uneven, perception nature, and kishke feel is strong, sense of touch is smooth, and organic solvent-free is residual, environment protection health.
Therefore, compared with prior art, the beneficial effect having is in the present invention:
1, the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce the flaws such as concave point;
2, strong, the good hand touch of kishke feel.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a preparation method for environment-friendly foaming artificial leather, is characterized in that, comprises the following steps:
Steps A, by the slurry that contains expansion type waterborne polyurethane resin and air mixed foaming, make waterborne polyurethane foaming slurry;
Step B, to coating before described waterborne polyurethane foaming slurry stir;
Step C, aqueous polyurethane fabric is coated on to release liners surface the dry surface layer that forms;
Step D, described waterborne polyurethane foaming slurry is coated on to described facing surface the dry middle foaming layer that forms;
Step e, aqueous polyurethane coating medium is coated on to described middle foaming layer surface forms tack coat, then base cloth is attached to described tie layer surface and tack coat is dried to processing;
Step F, removal release liners obtain semi-finished product;
Step G, described semi-finished product are processed by three editions, rear road processor, finishing agent is the aqueous solution of water-soluble silicon oil composition, rubs line half an hour after handling under 70 ℃ of conditions;
The composition of the described slurry that contains expansion type waterborne polyurethane resin comprises: 100 parts of aqueous foaming polyurethane resins, 1～5 part of foam stabilizer, 0.5～2 part of water-based thickener, 0.5～5 part of foam stabilizer, 2～10 parts of aqueous color pastes, 5～10 parts, water, 1～30 part of filler.
2. the preparation method of environment-friendly foaming artificial leather according to claim 1, it is characterized in that, described step B is realized by following mode: the described waterborne polyurethane foaming slurry before using high speed dispersor to coating stirs, and mixing speed is 500～800 revs/min.
3. the preparation method of environment-friendly foaming artificial leather according to claim 1, is characterized in that, described step C is realized by following mode: aqueous polyurethane fabric is evenly coated with and is scraped on release liners surface with being coated with cutter, and coating weight is 50～150g/m
2, then at 120～150 ℃, dry 2～3 minutes.
4. the preparation method of environment-friendly foaming artificial leather according to claim 1, is characterized in that, described step D is realized by following mode: described waterborne polyurethane foaming slurry is evenly coated with and is scraped at described facing surface with being coated with cutter, and coating weight is 200～500g/m
2, then at 120～150 ℃, dry 2～3 minutes.
5. the preparation method of environment-friendly foaming artificial leather according to claim 1, is characterized in that, described step e is realized by following mode: water-based polyurethane adhesive is evenly coated with and is scraped on described middle foaming layer surface with being coated with cutter, and coating weight is 100～150g/m
2, then base cloth be attached to described tie layer surface and at 140～160 ℃, dry 2～3 minutes.
6. according to the preparation method of the environment-friendly foaming artificial leather described in claim 1～5 any one, it is characterized in that: the composition of described aqueous polyurethane fabric comprises: 100 parts of waterborne polyurethane resins, 0.5～2 part of water-based thickener, 0.5～2 part of levelling agent, 2～20 parts of aqueous color pastes, 5～50 parts, water.
7. according to the preparation method of the environment-friendly foaming artificial leather described in claim 1～5 any one, it is characterized in that: the composition of described aqueous polyurethane coating medium comprises water-based polyurethane adhesive.
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Address after: 350300 Fuqing City, Fujian Province, Jiangyin Industrial Zone, the holy Road Patentee after: FUJIAN POLYTECH TECHNOLOGY CORP. LTD. Address before: 350300 Fuqing City, Fujian Province, Jiangyin Industrial Zone, the holy Road Patentee before: Fujian Polytech Group Co., Ltd. |