Method for manufacturing chromium-free waterborne pu bark

Abstract

The application discloses a chromium-free water-based PU bark manufacturing method and belongs to the technical field of leather. The method comprises the following steps: ingredient mixing and color matching, film pasting, aging, separation and trimming. In addition, the chromium-free water-based PU bark with a color changing effect, the chromium-free water-based PU bark with a simulated head leather effect or the chromium-free water-based PU bark with an embossing effect can be manufactured through a printing step or an embossing step, and it can be seen that the manufactured leather product has a wider application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of leather, and particularly relates to a production method of chrome-free water-based PU bark. BACKGROUND

[0002] Leather products are various, and are used in shoes, clothes, furniture and even engineering fields, so it can be seen that leather products are everywhere in daily life.

[0003] A Chinese patent application with the application number 201610688475.3 discloses a production process for preparing chrome-free tanned two-layer leather, which does not use chromium salt in the production process, and realizes descaling, softening, acid immersion, penetration reaction and tanning.

[0004] In the above technology, chromium salt is not used, but other properties of leather are not considered, which affects the application range of leather.

[0005] Therefore, it is necessary to prepare a leather with more properties, which can be used in more occasions and better reflect the value of leather. SUMMARY

[0006] The application aims to overcome the shortcomings of the prior art and provide a production method of chrome-free water-based PU bark.

[0007] The application adopts the following technical scheme:

[0008] The production method of the chrome-free water-based PU bark comprises the following steps: ingredient color matching, film pasting, maturation, separation and trimming.

[0009] The operation process of each specific step is as follows:

[0010] Further, the ingredient color matching comprises the following components according to mass fraction: 100-200 parts of poly-yu WBA-20 water-based resin, 1.2-2.4 parts of poly-yu IVA-50 thickening agent and 25-50 parts of huapu HP-RW water-based color paste. The water-based resin, thickening agent and water-based color paste are stirred uniformly, and then are left to stand for 12-16 min, so as to obtain the water-based material for film pasting.

[0011] Further, the film pasting process is as follows: according to mass fraction, 2-4 parts of poly-yu CUA-100 bridging agent is added into the obtained water-based material, and is stirred uniformly, and then the water-based material is uniformly scraped on release paper, and is scraped twice to obtain a water-based material layer, and then poly-yu 6038 hot melt adhesive is scraped on the water-based material layer to obtain a hot melt adhesive layer. Finally, the leather blank is pasted on the obtained hot melt adhesive layer to obtain the chrome-free water-based PU bark semi-finished product.

[0012] Further, the thickness of the water-based material is 0.2-0.3mm after two times of scraping, and the thickness of the hot melt adhesive layer is 0.1-0.2mm.

[0013] Further, the aging, separation and trimming process is specifically as follows: the obtained chrome-free water-based PU bark semi-finished product is placed in an aging room at 35-85 DEG C for 12-15h, until the skin embryo and the water-based material are completely attached, the aging room is taken out, the chrome-free water-based PU bark semi-finished product is separated from the release paper, and then trimming is performed to obtain a chrome-free water-based PU bark.

[0014] Further, after trimming, a printing step is further included, and the printing step is specifically as follows: 100-200 parts of resin pu-630, 5-10 parts of non-ionic dye water, 5-10 parts of non-ionic red dye water and 5-10 parts of non-ionic black dye water are uniformly stirred as printing dyes, then the obtained printing dyes are poured into the roller of a printing machine, when the obtained chrome-free water-based PU bark passes through the roller, the dyes are printed on the skin material through the roller, and then the obtained chrome-free water-based PU bark is dried in a drying area, so that the chrome-free water-based PU bark with color change effect is obtained.

[0015] Further, after trimming, a printing step is further included, and the printing step is specifically as follows: 100-200 parts of resin pu-630, 5-10 parts of non-ionic dye water, 5-10 parts of non-ionic red dye water and 5-10 parts of non-ionic black dye water are uniformly stirred as printing dyes, then the obtained printing dyes are poured into the roller of a printing machine, when the obtained chrome-free water-based PU bark passes through the roller, the dyes are printed on the skin material through the roller, and then the obtained chrome-free water-based PU bark is dried in a drying area, so that the chrome-free water-based PU bark with color change effect is obtained.

[0016] Further, after trimming, a printing step is further included, and the printing step is specifically as follows: 100-200 parts of resin pu-630, 5-10 parts of non-ionic dye water, 5-10 parts of non-ionic red dye water and 5-10 parts of non-ionic black dye water are uniformly stirred as printing dyes, then the obtained printing dyes are poured into the roller of a printing machine, when the obtained chrome-free water-based PU bark passes through the roller, the dyes are printed on the skin material through the roller, and then the obtained chrome-free water-based PU bark is dried in a drying area, so that the chrome-free water-based PU bark with color change effect is obtained.

[0017] After the pattern plate is selected, the obtained chrome-free water-based PU bark is placed on the embossing machine, the temperature of the embossing machine is 100-105 DEG C, the pressure is 100-110kg, the pattern plate is pressed for 3-4s, the pattern plate is lifted for 3-4s, then the pattern plate is pressed again for 3-4s, so that the chrome-free water-based PU bark with embossing effect is obtained.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] First, the chrome-free water-based PU bark is more green and environmentally friendly than the previous oil-based PU bark, the production process does not emit toxic gas, and the finished product does not release toxic substances.

[0020] Second, by independently matching the water-based material for film pasting, the poly-yu WBA-20 water-based resin, poly-yu IVA-50 thickening agent and huapu HP-RW water-based color paste are mixed, which can effectively improve the strength and color fastness of the leather surface.

[0021] Third, by printing step, the resin pu-630, nonionic dye water, nonionic red dye water, nonionic black dye water is stirred evenly as printing dye, printing on the leather, the color-changing effect of chrome-free water-based PU bark can be prepared;

[0022] Or, printing on black dye, chrome-free water-based PU bark with imitation head layer leather effect can be obtained;

[0023] Or, by embossing step, chrome-free water-based PU bark with embossing effect is obtained;

[0024] It can be seen that the leather prepared by the application can be used to make various performance leather products, and has wide application range. DETAILED DESCRIPTION

[0025] The raw materials used in the application are all commercially available, wherein:

[0026] Poly-yu WBA-20 water-based resin is purchased from Jinjiang Poly-yu Trade Co., Ltd.;

[0027] Poly-yu IVA-50 thickening agent is purchased from Jinjiang Poly-yu Trade Co., Ltd.;

[0028] Huapu HP-RW water-based color paste is purchased from Fujian Huapu Co., Ltd.;

[0029] Poly-yu CUA-100 bridging agent is purchased from Jinjiang Poly-yu Trade Co., Ltd.;

[0030] Poly-yu 6038 hot melt adhesive is purchased from Jinjiang Poly-yu Trade Co., Ltd.;

[0031] Resin pu-630 is purchased from Quanzhou Weihua Chemical Co., Ltd.;

[0032] Nonionic dye water is purchased from Quanzhou Weihua Chemical Co., Ltd.;

[0033] Nonionic red dye water is purchased from Quanzhou Weihua Chemical Co., Ltd.;

[0034] Nonionic black dye water is purchased from Quanzhou Weihua Chemical Co., Ltd.;

[0035] Black dye is purchased from Quanzhou Weihua Chemical Co., Ltd. black paint LBK.

[0036] Example 1

[0037] The method for preparing chrome-free water-based PU bark comprises the following steps:

[0038] Step one, ingredients and color matching, the configured water-based material includes the following components by mass fraction: poly-yu WBA-20 water-based resin 100 parts, poly-yu IVA-50 thickening agent 1.2 parts, huapu HP-RW water-based color paste 25 parts, the water-based resin, thickening agent and water-based color paste are stirred uniformly, and then stand for 12 min, to obtain the water-based material for film pasting.

[0039] When pasting the film, 2 parts of poly-yu CUA-100 bridging agent is added to the obtained water-based material by mass fraction, stirred uniformly, and then the water-based material is uniformly scraped on the release paper, scraped twice, the thickness of each time is 0.2 mm, to obtain a water-based material layer, then poly-yu 6038 hot melt adhesive is scraped on the water-based material layer, the thickness is 0.1 mm, to obtain a hot melt adhesive layer. Finally, the skin embryo is pasted on the obtained hot melt adhesive layer, to obtain a chromium-free water-based PU bark semi-finished product.

[0040] Then, the obtained chromium-free water-based PU bark semi-finished product is placed in a 35℃ curing room for 12 h, until the skin embryo and the water-based material are completely pasted, and then taken out of the curing room. This step is a curing step. Then, the chromium-free water-based PU bark semi-finished product is separated from the release paper, and finally trimmed to obtain a chromium-free water-based PU bark.

[0041] Example 2

[0042] The method for making a chromium-free water-based PU bark includes the following steps:

[0043] Step one, ingredients and color matching, the configured water-based material includes the following components by mass fraction: poly-yu WBA-20 water-based resin 100 parts, poly-yu IVA-50 thickening agent 1.2 parts, huapu HP-RW water-based color paste 25 parts, the water-based resin, thickening agent and water-based color paste are stirred uniformly, and then stand for 12 min, to obtain the water-based material for film pasting.

[0044] When pasting the film, 2 parts of poly-yu CUA-100 bridging agent is added to the obtained water-based material by mass fraction, stirred uniformly, and then the water-based material is uniformly scraped on the release paper, scraped twice, the thickness of each time is 0.2 mm, to obtain a water-based material layer, then poly-yu 6038 hot melt adhesive is scraped on the water-based material layer, the thickness is 0.1 mm, to obtain a hot melt adhesive layer. Finally, the skin embryo is pasted on the obtained hot melt adhesive layer, to obtain a chromium-free water-based PU bark semi-finished product.

[0045] Then, the obtained chromium-free water-based PU bark semi-finished product is placed in a 35℃ curing room for 12 h, until the skin embryo and the water-based material are completely pasted, and then taken out of the curing room. This step is a curing step. Then, the chromium-free water-based PU bark semi-finished product is separated from the release paper, and finally trimmed to obtain a chromium-free water-based PU bark.

[0046] Example 3

[0047] A method for manufacturing a chromium-free water-based PU bark, comprising the following steps:

[0048] Step one, ingredient color matching, the prepared water-based material comprises the following components in mass fraction: 150 parts of poly-yu WBA-20 water-based resin, 1.8 parts of poly-yu IVA-50 thickening agent, and 40 parts of huapu HP-RW water-based color paste. After the water-based resin, thickening agent and water-based color paste are stirred uniformly, they are left to stand for 14 min, and then a water-based material for film pasting is obtained.

[0049] When pasting the film, 3 parts of poly-yu CUA-100 bridging agent is added to the obtained water-based material, which is stirred uniformly, and then the water-based material is uniformly scraped on the release paper, which is scraped twice, with a thickness of 0.2 mm each time, so as to obtain a water-based material layer. Then, poly-yu 6038 hot melt adhesive is scraped on the water-based material layer, with a thickness of 0.1 mm, so as to obtain a hot melt adhesive layer. Finally, the skin blank is pasted on the obtained hot melt adhesive layer, and a chromium-free water-based PU bark semi-finished product is obtained.

[0050] Then, the obtained chromium-free water-based PU bark semi-finished product is placed in a 60℃ aging room for 13 h, until the skin blank and the water-based material are completely pasted, and then it is taken out of the aging room. This step is an aging step. Then, the chromium-free water-based PU bark semi-finished product is separated from the release paper, and finally, a chromium-free water-based PU bark is obtained after trimming.

[0051] Example 4

[0052] The difference between this example and examples 1-3 is that after trimming, a printing step is further included, which is as follows: 100 parts of resin pu-630, 5 parts of non-ionic dye water, 5 parts of non-ionic red dye water and 5 parts of non-ionic black dye water are stirred uniformly as printing dyes in mass fraction. Then, the obtained printing dyes are poured into the rollers of a printing machine. When the obtained chromium-free water-based PU bark passes through the rollers, the dyes will be printed on the skin material through the rollers. Then, the chromium-free water-based PU bark is dried in a drying area, and a chromium-free water-based PU bark with color-changing effect is obtained.

[0053] Example 5

[0054] The difference between this example and example 4 is that 150 parts of resin pu-630, 8 parts of non-ionic dye water, 8 parts of non-ionic red dye water and 8 parts of non-ionic black dye water are stirred uniformly as printing dyes in mass fraction.

[0055] Example 6

[0056] The difference between this example and example 4 is that 200 parts of resin pu-630, 10 parts of non-ionic dye water, 10 parts of non-ionic red dye water and 10 parts of non-ionic black dye water are stirred uniformly as printing dyes in mass fraction.

[0057] Example 7

[0058] The difference between this embodiment and examples 1~3 is that after trimming, a printing step is further included, which is specifically as follows: black dye is poured into a printing roller, when the obtained chromium-free water-based PU bark passes through the roller, the black dye is evenly coated on the chromium-free water-based PU hand, and then dried in a drying area, thereby obtaining a chromium-free water-based PU bark with a simulated head layer leather effect.

[0059] Example 8

[0060] The difference between this embodiment and examples 1~3 is that after trimming, an embossing step is further included, which is specifically as follows: a good pattern plate is selected, and then the obtained chromium-free water-based PU bark is placed on the embossing machine, the temperature of the embossing machine is 100℃, the pressure is 100kg, the pattern plate is pressed for 3s, lifted for 3s, and then pressed for 3s again, thereby obtaining an embossed chromium-free water-based PU bark.

[0061] Example 9

[0062] The difference between this embodiment and example 8 is that the temperature of the embossing machine is 105℃, the pressure is 110kg, the pattern plate is pressed for 4s, lifted for 4s, and then pressed for 4s again.

[0063] The leather products prepared in examples 1~9 are detected, and the yellowing resistance (AATCC-G) performance is greater than 4.5, and the dry wiping / AATCC-9 or wet wiping / AATCC-9 test is greater than 4.

[0064] At the same time, the transverse tensile force and the longitudinal tensile force are both greater than 49kg, and the transverse elongation rate and the longitudinal elongation rate are both greater than 39kg, so it can be seen that the prepared leather product has excellent strength and color fastness.

[0065] The above is the preferred embodiment of the present application, it should be pointed out that the pattern plate in the above examples is a conventional pattern plate in the industry. For ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also considered to be within the protection scope of the present application.

Claims

1. A method for producing a chrome-free aqueous PU bark, characterized in that, It comprises the following steps: ingredient toning, film pasting, aging, separation, pruning; The ingredient toning comprises the following components in terms of mass fraction: 100-200 parts of poly-yu WBA-20 water-based resin, 1.2-2.4 parts of poly-yu IVA-50 thickening agent, and 25-50 parts of huapu HP-RW water-based color paste; the poly-yu WBA-20 water-based resin, the poly-yu IVA-50 thickening agent, and the huapu HP-RW water-based color paste are stirred uniformly, and then left to stand for 12-16 min, to obtain a water-based material for film pasting; The film pasting process specifically comprises the following steps: 2-4 parts of poly-yu CUA-100 bridging agent is added to the obtained water-based material, and then stirred uniformly; then the water-based material is uniformly scraped on release paper, and scraped twice, to obtain a water-based material layer; then poly-yu 6038 hot melt adhesive is scraped on the water-based material layer, to obtain a hot melt adhesive layer; finally, the skin blank is pasted on the obtained hot melt adhesive layer, to obtain a chromium-free water-based PU bark semi-finished product; The thickness of the water-based material after being scraped twice is 0.2-0.3 mm, and the thickness of the hot melt adhesive layer is 0.1-0.2 mm; The aging, separation, and pruning process specifically comprises the following steps: the obtained chromium-free water-based PU bark semi-finished product is placed in an aging room at 35-85℃ for 12-15 h, until the skin blank and the water-based material are completely pasted; the chromium-free water-based PU bark semi-finished product is separated from the release paper, and then pruned to obtain a chromium-free water-based PU bark.

2. The method of claim 1, wherein the chromium-free aqueous PU bark is produced by the steps of: After pruning, a printing step is further included, which specifically comprises the following steps: 100-200 parts of resin pu-630, 5-10 parts of non-ionic dye water, 5-10 parts of non-ionic red dye water, and 5-10 parts of non-ionic black dye water are stirred uniformly as printing dyes; then the obtained printing dyes are poured into the roller of a printing machine; when the obtained chromium-free water-based PU bark passes through the roller, the dyes are printed on the bark through the roller; and then the chromium-free water-based PU bark is dried in a drying area, to obtain a chromium-free water-based PU bark with color-changing effect.

3. The method of claim 1, wherein the chromium-free aqueous PU bark is prepared by the steps of: After pruning, a printing step is further included, which specifically comprises the following steps: black dyes are poured into a printing roller; when the obtained chromium-free water-based PU bark passes through the roller, the black dyes are uniformly coated on the chromium-free water-based PU bark; and then the chromium-free water-based PU bark is dried in a drying area, to obtain a chromium-free water-based PU bark with imitation head layer leather effect.

4. The method of claim 1, wherein the chromium-free aqueous PU bark is prepared by the steps of: After pruning, an embossing step is further included, which specifically comprises the following steps: A suitable embossing plate is selected, and then the obtained chromium-free water-based PU bark is placed on an embossing machine; the temperature of the embossing machine is 100-105℃, the pressure is 100-110 kg, the embossing plate is pressed for 3-4 s, lifted for 3-4 s, and then pressed again for 3-4 s, to obtain an embossed chromium-free water-based PU bark.