CN102409552A - Preparation method of environment-friendly foamed artificial leather - Google Patents
Preparation method of environment-friendly foamed artificial leather Download PDFInfo
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- CN102409552A CN102409552A CN2011102592664A CN201110259266A CN102409552A CN 102409552 A CN102409552 A CN 102409552A CN 2011102592664 A CN2011102592664 A CN 2011102592664A CN 201110259266 A CN201110259266 A CN 201110259266A CN 102409552 A CN102409552 A CN 102409552A
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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 prepares the preparation method of environment-friendly foaming artificial leather.
Background technology
The tradition foam leather is mainly the foam polyvinyl chloride artificial leather, mainly is 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 the PVC foaming.This foam process requires temperature more than 180～200 ℃, and the used plasticizer of polyvinyl chloride mostly be the 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 qualification.
Other has one type of foam leather is the 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.
More than the foam leather produced of two kinds of methods all exist plasticizer and the organic solvent that human body is had harm, not environmental protection brings injury to people's life health.
At present; The environment-friendly foaming artificial leather of environment-friendly water-based polyurethane production of resins has appearred utilizing; Because waterborne polyurethane resin is solvent with water, nontoxic nothing harm, and in the whole process of production of making foam leather, do not add any organic solvent yet; Therefore there are not waste water, toxic emission; Can not work the mischief to health and ecological environment, reduce recycling equipment and energy resource consumption simultaneously, be the best alternative materials of solvent borne polyurethane foam leather and foam polyvinyl chloride artificial leather therefore.One Chinese patent application numbers 201010547902.9; Patent name is " a kind of novel environment-friendly water-based PU leather "; The preparation method that a kind of applying waterborne polyurethane resin prepares the environmental protection artificial leather is disclosed; But the artificial leather intermediate layer that it makes is not the aqueous polyurethane foaming layer, does not relate to the problem of aqueous polyurethane foaming yet.One Chinese patent application numbers 201010245381.1; Patent name is " a kind of production method of synthetic leather and a synthetic leather "; Disclose the production method of the professional foaming machine foam production of a kind of usefulness aqueous polyurethane foam leather, its production stage roughly is please with reference to shown in Figure 1: 1, preparation aqueous polyurethane foaming slurry; 2, form surface layer; 3, form middle foaming layer; 4, form tack coat.Utilize the abscess of middle foaming layer of the product of this method manufacturing to be prone to phenomenon not of uniform size, skewness; And product surface is prone to produce problems such as the concave point flaw is arranged; And finished product is not carried out deep processing, cause 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, big or small consistent that technical problem to be solved by this invention provides 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 may further comprise the steps:
Steps A, the slurry that will contain the expansion type waterborne polyurethane resin and air mixed foaming make aqueous polyurethane foaming slurry;
Step B, the said aqueous polyurethane foaming slurry before being coated with is stirred;
Step C, the aqueous polyurethane lining is coated on release liners surface and the dry surface layer that forms;
Step D, said aqueous polyurethane foaming slurry is coated on said facing surface and the dry middle foaming layer that forms;
Step e, the aqueous polyurethane coating medium is coated on said middle foaming layer surface forms tack coat, then base cloth is attached to said tie layer surface and tack coat is carried out dried;
Step F, removal release liners obtain semi-finished product;
Step G, said semi-finished product are handled through back road three editions processors, finishing agent is the aqueous solution of water-soluble silicon oil composition, handles the back and under 70 ℃ of conditions, rubs line half an hour.
The preparation method of environment-friendly foaming artificial leather of the present invention; Before the coating of aqueous polyurethane foaming slurry, make it be in stirring; Efficiently solving aqueous polyurethane foaming slurry is prone to cause the minute bubbles in the slurry to be combined into air pocket after placing a period of time; And produce the problem that bubble precipitates, and the product cell size of having avoided therefore causing differs, and local abscess is excessive and distribution of cells is uneven; Product surface has flaws such as concave point, has guaranteed the stability of the bubble of the aqueous polyurethane foaming slurry in the coating process; After removing release liners, line is handled and rubbed to semi-finished product further through three editions processors in road later handle, make the kishke feel of finished product and feel better.
Therefore, the present invention compared with prior art, the beneficial effect that is had is:
1, the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce flaws such as concave point;
2, strong, the good hand touch of kishke feel.
Description of drawings
Shown in Figure 1 is the preparation method's of existing environment-friendly foaming artificial leather flow chart.
Shown in Figure 2 is the preparation method's of environment-friendly foaming artificial leather of the present invention flow chart.
The specific embodiment
By specifying technology contents of the present invention, structural feature, realized purpose and effect, give explanation below in conjunction with embodiment and conjunction with figs. are detailed.
With reference to shown in Figure 2, the preparation method of environment-friendly foaming artificial leather of the present invention may further comprise the steps:
Steps A, preparation aqueous polyurethane foaming slurry: will contain the slurry and the air mixed foaming of expansion type waterborne polyurethane resin, and make aqueous polyurethane foaming slurry;
Wherein, the said composition that contains the slurry of 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 in water, 1～30 part of filler.After being mixed with slurry by above-mentioned raw materials, preferably it is stirred foaming with high speed dispersor.This foaming process is the physical mechanical foaming; Need in the whipping process with tracheae from the slurry bottom bubbling air in slurry; Air and material are fully mixed, under the effect of auxiliary agents such as foam stabilizer, foam stabilizer, improve number of bubbles in the material; Increase the volume of material, make to have evenly tiny minute bubbles in the material.Regulate the amount of auxiliary agent and the time of stirring, can control size, the uniformity of minute bubbles in volume and the material of aqueous polyurethane foaming slurry.Preferably, at room temperature foam, mixing time is 20～50 minutes, and mixing speed is 1000～1500 rev/mins, and the viscosity of slurry is 5000～7000cps.Use common high-speed dispersion equipment to prepare the foaming slurry among the present invention, prepare the foaming slurry, can make to produce to drop into and reduce, reduce cost and need not professional foaming machine equipment.
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, the environment around the factory is not polluted, and meets the ecological, environmental protective requirement.
Preferably, said aqueous foaming polyurethane resin is one or more of anion fat adoption ester type, polyether-type;
Preferably, said foam stabilizer is a fatty acid amide surfactants;
Preferably, said water-based thickener is polyurethanes thickener or cellulose thickener;
Preferably, said foam stabilizer is the fatty acid salt surfactant;
Preferably, said filler is precipitated calcium carbonate or wood powder.
Stir before step B, the coating: the said aqueous polyurethane foaming slurry to before being coated with stirs;
Wherein, said step B can be realized by following mode: use high speed dispersor that the said aqueous polyurethane foaming slurry before being coated with is stirred, mixing speed is 500～800 rev/mins.
Among the existing preparation method, aqueous polyurethane foaming slurry (for example on coating cloth deck and in reinforced process) before coating does not stir promptly and directly applies, and causes the minute bubbles in the slurry to be combined into air pocket easily like this; And generation bubble deposition; Cause bubble not of uniform size, 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 the coating of aqueous polyurethane foaming slurry, make it be in stirring, efficiently solve aqueous polyurethane foaming slurry and after placing a period of time, be prone to cause the minute bubbles in the slurry to be combined into air pocket, and produce the problem of bubble deposition; The product cell size of having avoided therefore causing differs; Local abscess is excessive and distribution of cells is uneven, and product surface has flaws such as concave point, has guaranteed the stability of the bubble of the aqueous polyurethane foaming slurry in the coating process; Make the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce flaws such as concave point.
Step C, formation surface layer: the aqueous polyurethane lining is coated on release liners surface and the dry surface layer that forms;
Wherein, the composition of said aqueous polyurethane lining 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 in water.Said release liners can be in U.S.'s release liners, Britain's release liners, Japanese release liners, the Italian release liners one or more, for example, and the PXDH R-64BC-2 release liners that the 274# release liners that U.S. SAPPI produces, Japanese LINTEC produce.Said step C can be realized by following mode: the aqueous polyurethane lining evenly is coated with and scrapes on release liners surface with being coated with cutter, and coating weight is 50～150g/m, then 120～150 ℃ of oven dry 2～3 minutes down.
Step D, formation middle foaming layer: said aqueous polyurethane foaming slurry is coated on said facing surface and the dry middle foaming layer that forms;
Wherein, said step D is realized by following mode: said aqueous polyurethane foaming slurry evenly is coated with and scrapes at said facing surface with being coated with cutter, and coating weight is 200～500g/m, dries 2～3 minutes down at 120～150 ℃ then.
Step e, formation tack coat: the aqueous polyurethane coating medium is coated on said middle foaming layer surface forms tack coat, then base cloth is attached to said tie layer surface and tack coat is carried out dried;
Wherein, the composition of said aqueous polyurethane coating medium comprises water-based polyurethane adhesive.Said base cloth can be one or more of nonwoven fabric, woven cloth or knitted cloth, is preferably woven cloth or knitted cloth.Said step e is realized by following mode: water-based polyurethane adhesive evenly is coated with and scrapes on said middle foaming layer surface with being coated with cutter, and coating weight is 100～150g/m, then base cloth is attached to said tie layer surface and 140～160 ℃ of oven dry 2～3 minutes down.
Step F, removal release liners: remove release liners and obtain semi-finished product;
Said step F can adopt industry stripping off device commonly used to carry out, and what obtain after release liners and said top layer are peeled off is semi-finished product.
Step G, post processing: said semi-finished product are handled through back road three editions processors, and finishing agent is the aqueous solution of water-soluble silicon oil composition, handles the back and under 70 ℃ of conditions, rubs line half an hour.
Wherein, it is in 70 ℃ the boarding machine that the semi-finished product after will handling through the three editions processors in road, back place temperature, rubs line half an hour; Under the pullling of rubbing process, the lines of surface of semi-finished is deepened more, the block effect is obvious between the lines; The third dimension emersion, represent fully, exactly like corium.
Taking-up and the arrangement in the boarding machine of semi-finished product after completion rubbed line and handle, rolling are finished product.
Adopt the preparation method of environment-friendly foaming artificial leather of the present invention, the environmental protection artificial leather product cell stabilization that makes, uniform and smooth, rebound performance is good; The no concave point flaw in surface, lines is uneven, the impression nature, kishke feel is strong; Sense of touch is smooth, and organic solvent-free is residual, environment protection health.
Therefore, the present invention compared with prior art, the beneficial effect that is had is:
1, the abscess of product finer and closely woven, be more evenly distributed, size is more consistent, product surface can not produce flaws such as concave point;
2, strong, the good hand touch of kishke feel.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes description of the present invention to do; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (9)
1. the preparation method of an environment-friendly foaming artificial leather is characterized in that, may further comprise the steps:
Steps A, the slurry that will contain the expansion type waterborne polyurethane resin and air mixed foaming make aqueous polyurethane foaming slurry;
Step B, the said aqueous polyurethane foaming slurry before being coated with is stirred;
Step C, the aqueous polyurethane lining is coated on release liners surface and the dry surface layer that forms;
Step D, said aqueous polyurethane foaming slurry is coated on said facing surface and the dry middle foaming layer that forms;
Step e, the aqueous polyurethane coating medium is coated on said middle foaming layer surface forms tack coat, then base cloth is attached to said tie layer surface and tack coat is carried out dried;
Step F, removal release liners obtain semi-finished product;
Step G, said semi-finished product are handled through back road three editions processors, finishing agent is the aqueous solution of water-soluble silicon oil composition, handles the back and under 70 ℃ of conditions, rubs line half an hour.
2. the preparation method of environment-friendly foaming artificial leather according to claim 1; It is characterized in that; Said steps A is realized by following mode: the slurry that will contain the expansion type waterborne polyurethane resin at room temperature stirs with high speed dispersor, in the whipping process from slurry bottom in slurry bubbling air, mixing time is 20～50 minutes; Mixing speed is 1000～1500 rev/mins, and the viscosity of slurry is 5000～7000cps.
3. the preparation method of environment-friendly foaming artificial leather according to claim 1; It is characterized in that; Said step B is realized by following mode: use high speed dispersor that the said aqueous polyurethane foaming slurry before being coated with is stirred, mixing speed is 500～800 rev/mins.
4. the preparation method of environment-friendly foaming artificial leather according to claim 1; It is characterized in that; Said step C is realized by following mode: the aqueous polyurethane lining evenly is coated with and scrapes on release liners surface with being coated with cutter, and coating weight is 50～150g/m, then 120～150 ℃ of oven dry 2～3 minutes down.
5. the preparation method of environment-friendly foaming artificial leather according to claim 1; It is characterized in that; Said step D is realized by following mode: said aqueous polyurethane foaming slurry evenly is coated with and scrapes at said facing surface with being coated with cutter; Coating weight is 200～500g/m, dries 2～3 minutes down at 120～150 ℃ then.
6. the preparation method of environment-friendly foaming artificial leather according to claim 1; It is characterized in that; Said step e is realized by following mode: water-based polyurethane adhesive evenly is coated with and scrapes on said middle foaming layer surface with being coated with cutter; Coating weight is 100～150g/m, then base cloth is attached to said tie layer surface and descends oven dry 2～3 minutes at 140～160 ℃.
7. according to the preparation method of any described environment-friendly foaming artificial leather of claim 1～6; It is characterized in that: the composition of said aqueous polyurethane lining 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 in water.
8. according to the preparation method of any described environment-friendly foaming artificial leather of claim 1～6; It is characterized in that: the said composition that contains the slurry of 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 in water, 1～30 part of filler.
9. according to the preparation method of any described environment-friendly foaming artificial leather of claim 1～6, it is characterized in that: the composition of said aqueous polyurethane coating medium comprises water-based polyurethane adhesive.
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| CN102677482A (en) * | 2012-05-21 | 2012-09-19 | 海宁大红马布业有限公司 | Environment-friendly waterborne polyurethane suede leather with high permeability and preparation method of environment-friendly waterborne polyurethane suede leather |
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| CN104499301A (en) * | 2014-11-17 | 2015-04-08 | 杭州苏威进出囗有限公司 | Preparation technology for synthesizing leather by durable environmental protection wet-type PU |
| CN104499301B (en) * | 2014-11-17 | 2016-05-11 | 杭州苏威进出囗有限公司 | A kind of preparation technology of durability environ mental protective wet type Pu synthetic leather |
| CN105951457A (en) * | 2016-05-17 | 2016-09-21 | 福建宝利特科技股份有限公司 | Artificial leather semi-finished product and preparation method thereof |
| CN106290151A (en) * | 2016-08-25 | 2017-01-04 | 合肥科天水性科技有限责任公司 | A kind of detection method of the adhesive property of half PU leather bed material |
| CN106243687A (en) * | 2016-08-26 | 2016-12-21 | 福建宝利特科技股份有限公司 | A kind of non-solvent foamed material and artificial leather |
| CN110791970A (en) * | 2018-08-01 | 2020-02-14 | 中国科学院化学研究所 | Breathable oleophylic PU artificial leather and preparation method thereof |
| CN110791972A (en) * | 2018-08-01 | 2020-02-14 | 中国科学院化学研究所 | Breathable PU artificial leather and preparation method thereof |
| CN110791970B (en) * | 2018-08-01 | 2021-03-02 | 中国科学院化学研究所 | Breathable oleophylic PU artificial leather and preparation method thereof |
| CN109554936A (en) * | 2018-12-29 | 2019-04-02 | 扬州市德运塑业科技股份有限公司 | A kind of novel synthetic leather and preparation method thereof |
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| CN102409552B (en) | 2014-04-16 |
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