1. The utility model provides a surface fabric for luggage, includes the coating resin layer 1 of base cloth and base cloth one side, characterized by: the resin layer 1 contains a compound A, the main chain of the compound A comprises a group X and a group Y, and the side chain is one or more of-O-, -NO and C-H, wherein the groupX is-COOR₁O-（R₁Aliphatic or aromatic), [ -CH ]₂-]n- (n ≧ 6) or one or more epoxy groups, and the group Y is-COO-NH-.

2. The fabric for suitcases and bags as set forth in claim 1, which is characterized in that: the fiber raw material for forming the base fabric is polyamide fiber.

3. The fabric for suitcases and bags as set forth in claim 1, which is characterized in that: the other side of the base fabric also comprises a resin layer 2, the resin layer 2 contains a compound B, and the main chain of the compound B is-CH₂-CR₂-, wherein R₂is-CH₃Or H; side chains of-Si-O-, -NO₂、-NO、C-Cl、-COOR₃（R₃Is- [ -CH₂-]n-CH₃N ≧ 3), and C-H.

4. The fabric for suitcases and bags according to any one of claims 1 to 3, wherein: the tearing strength of the fabric in the warp and weft directions is more than 600N measured according to the JIS L10962010 single tongue method.

5. The fabric for suitcases and bags according to any one of claims 1 to 3, wherein: the water repellency of the front and back surfaces of the fabric measured according to the JIS L10922009 method is more than 3 grade.

Background

With the continuous improvement of the quality of life and the consumption level, the functional requirements of people on the fabric are higher and higher. And the post-finishing process of imparting functionality is a common means of achieving each function. For example, patent document CN106758244A discloses a soft waterproof fabric, in which a waterproof coating layer is coated on a fabric woven from a common natural fiber or a synthetic fiber, the waterproof coating layer is composed of a phenol resin, a polycarbonate, a fluoropolymer, an organosilicon compound, fumed silica, graphite, and the like, and although the fabric is relatively good in both waterproof property and flexibility, both free formaldehyde and fluoropolymer present in the phenol resin adversely affect the human body and the environment.

In addition, the first and second substrates are,the water repellent coating products are also applied to the field of bags and suitcases. For example, patent document CN109457493A discloses an environment-friendly waterproof bag fabric, which comprises a fabric substrate and a waterproof coating disposed on the surface of the fabric substrate, wherein the waterproof coating is made of nano SiO₂The sol organic silicon modified polyurethane emulsion, the thickening agent and water are composed, so that the waterproof performance is excellent, the coating is safe, environment-friendly and non-toxic, but the coating composition cannot solve the problems of whitening and reduction of tearing strength of the fabric caused by stripping of the coating after tearing.

Disclosure of Invention

The invention aims to provide a case fabric which is high in tearing strength and free from whitening after tearing.

The case fabric comprises base cloth and a coating resin layer on one side of the base cloth, wherein the coating resin layer contains a compound A, the main chain of the compound A comprises a group X and a group Y, and the side chain is one or more of-O-, -NO and C-H, wherein the group X is-COOR₁O-（R₁Aliphatic or aromatic), [ -CH ]₂-]n- (n ≧ 6) or one or more epoxy groups, and the group Y is-COO-NH-.

According to the invention, the modified resin with high affinity with the fiber is coated on the base cloth, so that the peeling strength is improved, and the occurrence of whitening problem is avoided; and because the resin layer contains the compound A, the resin strength is high, the cohesion between fiber bundles is high, the problem that fibers are easy to slip when the fabric is torn is effectively solved, the tearing strength of the fabric is greatly improved, and the fabric is particularly suitable for manufacturing luggage cases, handbags and the like.

Detailed Description

The case and bag fabric comprises a base fabric and a coating resin layer 1 on one side of the base fabric, wherein the resin layer 1 contains a compound A, the main chain of the compound A comprises a group X and a group Y, and the side chain is one or more of-O-, -NO and C-H, wherein the group X is-COOR₁O-（R₁Aliphatic or aromatic), [ -CH ]₂-]n- (n ≧ 6) or one or more epoxy groups, and the group Y is-COO-NH-.

The side chain of the compound A is one or more of-O-, -NO and C-H. Wherein, -O-is a weak polar group, has good organic property and better affinity with fiber molecules; and when it comes from the ring opening of the epoxy group, the resin strength is improved due to the self-crosslinking reaction occurring during the ring opening. the-NO (nitroxide group) can induce the activation reaction of the C-H groups on the fibers. C-H (hydrocarbon group) can provide active hydrogen atoms to react with the groups on the fiber capable of reacting with the active hydrogen. The compound A in the coating resin has higher strength and better affinity with the fiber due to the existence of the specific group X on the main chain. The compound a is derived from a solvent-based resin, and includes polycarbonate urethane, polyethylene urethane, and polyepoxy urethane, and these may be used alone or in combination of two or more.

Compared with other synthetic fibers such as polyester fiber and the like, the polyamide fiber has the advantages of higher strength, better wear resistance, small density and the like, and better meets the requirements of bags on wear resistance, light weight and the like. Therefore, the fiber material is preferable as the fiber material for forming the base fabric of the present invention.

Preferably, the other side of the base fabric of the present invention further includes a resin layer 2. The resin layer 2 may be provided only on the other side of the base fabric corresponding to the coating resin layer, and may be provided on the surface of the coating resin layer 1, i.e., on both sides of the base fabric. The resin layer 2 herein contains a compound B wherein the main chain of the compound B is-CH₂-CR₂-, wherein R₂is-CH₃Or H; side chains of-Si-O-, -NO₂、-NO、C-Cl、-COOR₃（R₃Is- [ -CH₂-]n-CH₃N ≧ 3), and C-H. The group is from organosilicon, paraffin or hydrocarbon resin, can not generate perfluorooctanoic acid and derivatives thereof, belongs to environment-friendly substances, meets the development trend of times, is more beneficial to the popularization and generalization of products, and can be marketedThe vend product may also be self-formulated.

If the amount of the coating resin layer 1 attached is too low, the strength of the resin between the fiber bundles tends to be low, and the peel strength tends to decrease; on the other hand, if the amount of adhesion of the coating resin layer 1 is too high, not only the cost is increased, but also the overall light weight feeling may be affected. Therefore, in the present invention, it is preferable that the amount of the coating resin layer 1 to be adhered is 30 to 100g/m²In the meantime.

Considering that the surface structure of the fabric influences the penetration of the resin, and the penetration of the resin in the yarns influences the peeling strength and the tearing strength, the average penetration depth of the resin on the surface of the convex parts (non-boundary parts of the weft yarns) of the fabric is preferably between 30 and 150 μm, and the average penetration depth of the resin on the concave parts (boundary parts of the warp yarns and the weft yarns) is preferably between 50 and 300 μm. If the depth of penetration of the resin in the convex portion is less than 30um, on the one hand, a problem of low peel strength may occur due to a decrease in the area of connection between the resin and the fiber; on the other hand, in the tearing process of the fabric, the resin film is directly peeled off from the fabric without being torn, so that the tearing and whitening phenomenon can be caused; if the penetration depth exceeds 150um, the cost increases and the overall light weight is impaired. In addition, if the penetration depth of the resin in the concave part is less than 50um, the connection force between the fiber bundles is small, and the fiber bundles in the longitudinal direction and the transverse direction may move irreparably; if the penetration depth exceeds 300um, the cost is increased, the overall light weight is impaired, and the penetration into the non-coated surface may impair the appearance of the product.

In the invention, the higher the stripping strength among the single fiber bundles is, the larger the binding force among the fiber bundles is, the less the problem of relative slippage of the fiber bundles is caused, and the better the shape retention of the product is; the fiber bundle is not easy to be separated from the edge in the cutting, sewing and other processes. The requirements for peel strength of a single fiber bundle vary depending on the use of the product. For use as a bag, the single fiber bundle is required to have a peeling strength of 6N or more. The single fiber bundle peeling strength herein refers to a binding force between fiber bundles.

Preferably, the tear strength of the fabric of the present invention in both the warp and weft directions is 600N or more as measured by the JIS L10962010 one tongue method.

Preferably, both the front and back sides of the fabric of the present invention have a water repellency of grade 3 or more as measured according to JIS L10922009.

When the case fabric comprises the coating resin layer 1 on one side of the base fabric and the resin layer 2 on the other side of the base fabric, the manufacturing method is not particularly limited, and considering that the resin used in the coating contains-COO-NH-groups, the affinity of the-COO-NH-groups with fibers is high, the leveling property is good during coating processing, and the problem that the whitening phenomenon is easy to occur during tearing can be effectively solved; in addition, the resin layer formed by the water-repellent resin is positioned on the upper layer of the coating resin layer, and the coating resin layer has the advantages of cleanness, easiness in cleaning and the like. Therefore, it is preferably obtained by a coat-single-side water repellent process or a coat-pad (double-side water repellent) process, that is, a coat process is performed first. The coating resin processing liquid may contain, in addition to the compound a, other resins as needed, but does not include the aqueous polyurethane resin. In addition, in order to promote the reaction, preferably adding a crosslinking agent, here the crosslinking agent is not particularly limited, can be cited melamine, isocyanate, its use amount can be adjusted according to the need, preferably the use amount is 1 ~ 5 parts by weight. The compound A of the present invention is derived from a solvent-based resin, and the solvent used in the processing is not particularly limited, and examples thereof include acetone, toluene and the like, and the amount thereof may be adjusted as necessary, and is preferably 10 to 60 g/L.

The test method of each index related in the invention is as follows:

(1) composition analysis of coating resin layer 1

Firstly, take 0.01m by using a disc sampler²1 sample cloth with the same area size is dissolved by 500mL of solvent (such as formic acid for polyamide fiber and hexafluoroisopropanol for polyester fiber) to obtain sheet resin. After the obtained sheet-like resin was washed with water at 20 ℃ C.. times.1 minutes and dried at 40 ℃ C.. times.60 minutes, followed by dissolving the sheet-like resin with 10mL of acetone, removing the undissolved resin layer 2 (if the resin layer 2 is not present, this step can be omitted),after baking the resin-containing acetone into a pure resin film, the obtained resin film was observed with an infrared tester (FTIR 8400S manufactured by shimadzu corporation, japan) and the chemical bond of the side chain of the compound in the coating resin layer 1 was confirmed from the characteristic absorption peak position, specifically, as follows: 1010-1270 cm of-O- (C-O-C telescopic vibration^-1) Minus NO (C-N telescopic vibration 1020-1340 cm)^-1And N = O telescopic vibration 1550-1600 cm^-1) C-H (CH stretching vibration: 3000-3100 cm^-1CH internal bending vibration: 1290-1430 cm^-1CH external bending vibration: 650-1010 cm^-1). The obtained resin film was observed with a raman spectrometer (LabRAM HR Evolution), and the chemical bond of the main chain of the compound in the coating resin layer 1 was confirmed from the characteristic absorption peak position thereof, specifically as follows: -COOR₁O-group (C = O stretching vibration: 1720-1770 cm)^-1C-O-C stretching vibration: 1100-1280 cm^-1)、－[-CH₂-]n-group (722 cm)^-1A moderately strong absorption peak), epoxy group (C-O-C stretching vibration: 1010-1270 cm^-1) -COO-NH-group (NH-ene: 3500-3100 cm^-1C = O stretching vibration: 1630-1680 cm^-1NH bending vibration: 1550-1640 cm^-1C-N stretching vibration: 1400 to 1420cm^-1)。

(2) Resin layer 2 composition analysis

First, whether the fabric has water repellency or not is confirmed according to JIS L1092 method (2009). If so, the structure of the water-repellent resin is then confirmed. Wherein, the side chain determination: observing the non-coating resin surface by using an infrared tester (FTIR 8400S manufactured by Shimadzu corporation, Japan), and observing the non-coating resin surface according to the characteristic absorption peak position-Si-O- (stretching vibration 1020-1095 cm)^-1)、-NO₂(reverse telescopic vibration 1530-1590 cm^-1Or positive stretching vibration 1350-1390 cm^-1) Minus NO (C-N telescopic vibration 1020-1340 cm)^-1And N = O telescopic vibration 1550-1600 cm^-1) C-Cl (700-750 cm telescopic vibration)^-1)、-COOR₃(C = O telescopic vibration: 1720-1770 cm^-1C-O-C stretching vibration: 1100-1280 cm^-1And 722cm^-1A moderately strong absorption peak). And (3) main chain determination: by usingObserving the non-coating resin surface by a Raman spectrum analyzer (LabRAM HR Evolution), and determining the characteristic absorption peak position-CH₂-CR₂- (C-C telescopic vibration: 1140-1250 cm)^-1CH stretching vibration: 3000-3100 cm^-1CH internal bending vibration: 1290-1430 cm^-1CH external bending vibration: 650-1010 cm^-1) To judge.

(3) Tearing strength

According to JIS L1096 single tongue method (2010).

(4) Water repellency

According to JIS L1092 method (2009).

(5) Peeling strength between single fiber bundles

3 blocks of sample longitude and latitude with the size of 5cm multiplied by 25cm are cut. Taking 1 of the two, tearing out one complete single fiber bundle from the edge along the direction of 25cm, then tearing out the second complete single fiber bundle by 10cm to the middle position, then clamping the sample by an upper end clamp mouth of the device, clamping the single fiber bundle by a lower end clamp mouth, recording the force N used for stripping the fiber bundle from the sample according to the JIS L1096 single tongue method (2010), then measuring the remaining 5 samples, and taking the average value.

(6) Amount of adhesion of coating resin layer 1

Taking 0.01m by using a disc sampler²For the area size sample, the fibers are dissolved away with 500mL of solvent (for example, formic acid for polyamide fibers, hexafluoroisopropanol for polyester fibers, etc.) to obtain the sheet resin. Washing the obtained sheet resin with 3 times of water (20 ℃ for 1 min), drying at 40 ℃ for 60min, and weighing the weight as M1; then, the sheet-like resin was dissolved in 10mL of acetone to obtain a resin layer 2, which was washed with 3 times of water (20 ℃. times.1 min), dried at 40 ℃. times.60 min, and the weight of the resin layer was recorded as M2, and the amount of adhesion of the coated resin layer 1 was = M1-M2.

(7) Depth of resin penetration

A piece of sample cloth 3 having a length of 1 cm. times.a width of 0.5cm was prepared, and its cross section was photographed by SEM photography using a TM3030Plus apparatus from Hitachi High-Technologies Corporation. And taking 1 of the yarns, magnifying the magnification to 200 times, observing the resin permeation condition at the un-jointed part of the warp and weft yarns, taking the surface layer yarn of the resin surface as a starting point and the position point penetrated by the resin in the yarn as an end point, taking 20 positions for measurement, and averaging.

(8) Peeling and whitening

A tearing test was performed on a sample having a size of 5cm × 25cm according to JIS L1096 single tongue method (2010), a torn edge of the torn sample was observed, and if a white resin film was peeled off from the fabric, it was considered that a peeling whitening phenomenon occurred; on the contrary, it is considered that the peeling whitening phenomenon does not occur.

The present invention will be further described with reference to examples and comparative examples.

Example 1

(1) Resin-making processing liquid 1:

100 parts by weight of a polycarbonate urethane resin (solid content: 35%)

3 parts by weight of melamine cross-linking agent

Toluene 25 parts by weight

Uniformly stirring the mixture for 30 minutes at a speed of 500r/min, standing and defoaming the mixture for 1 hour to obtain a resin processing solution;

(2) the resin processing liquid 1 was applied to a prepared polyamide fiber woven fabric on a coating machine, and then dried through a continuous drying oven (80 → 110 → 160 ℃) to obtain an adhesion amount of 30g/m²The coated fabric of (1);

(3) preparing a resin processing liquid 2:

hydrocarbon non-fluorine water repellent (solid content 35%) 100g/L

Isocyanate crosslinking agent 30g/L

Carrying out one-dipping one-rolling processing on the coating fabric by using resin processing liquid 2, wherein the liquid carrying rate is 30%;

and finally, drying at 110 ℃ for 2min and shaping at 170 ℃ for 1min to obtain the fabric of the invention, wherein the properties of the fabric are shown in Table 1.

Example 2

The same as in example 1 except that the polycarbonate type urethane resin in the resin processing liquid 1 was replaced with polyethylene type urethane resin, the fabric of the present invention was produced, and the properties thereof are shown in table 1.

Example 3

The same procedure as in example 1 was repeated except that the hydrocarbon non-fluorine water repellent agent in the resin processing liquid 2 was replaced with the silicone non-fluorine water repellent agent, to obtain a bag fabric of the present invention, and the properties thereof are shown in table 1.

Example 4

The amount of the polycarbonate urethane resin used was adjusted to 50g/m²The same as in example 1, except that the properties of the fabric of the present invention are shown in Table 1.

Example 5

The amount of the polycarbonate urethane resin used was adjusted to 100g/m²The same as in example 1 was repeated to obtain a case fabric of the present invention, the properties of which are shown in Table 1.

Example 6

The amount of toluene used in the resin processing liquid 1 was adjusted to 50 parts by weight, and the same procedure as in example 1 was repeated to obtain a bag fabric of the present invention, the properties of which are shown in Table 1.

Example 7

Without padding processing with the resin processing liquid 2, the same procedure as in example 1 was carried out to obtain a fabric for bags and suitcases of the present invention, the properties of which are shown in table 1.

Example 8

The same procedure as in example 1 was repeated except that the woven fabric of polyamide fiber was replaced with a woven fabric of polyester fiber to obtain a fabric for bags and suitcases of the present invention, the properties of which are shown in Table 1.

Comparative example

The same as in example 1 except that the polycarbonate polyurethane resin in the resin processing liquid 1 was replaced with the polyether polyurethane resin, a fabric for bags was obtained, and the properties thereof are shown in table 1.

TABLE 1

According to the results of Table 1 below,

(1) as is clear from examples 1 and 2, the fabrics obtained by processing using a polyethylene urethane as a coating resin under the same conditions had comparable peel strength between fiber bundles and water repellency and had no problem of peeling and whitening, but had higher tear strength than the fabrics obtained by processing using a polycarbonate urethane as a coating resin.

(2) As is clear from example 1 and example 3, the fabrics processed with the hydrocarbon water-repellent resins had comparable tear strength, fiber bundle-to-fiber peel strength, and water repellency to those processed with the silicone water-repellent resins under the same conditions, and the problems of peeling and whitening did not occur.

(3) As is clear from example 6 and example 1, the fabric obtained by processing the coating resin processing liquid containing 50 parts by weight of the solvent had a deeper penetration depth, and the tear strength and the fiber bundle peeling strength were slightly superior to those of the fabric obtained by processing the coating resin processing liquid containing 30 parts by weight of the solvent, and both had comparable water repellency and no problem of peeling and whitening.

(4) As is clear from example 8 and example 1, the fabric having a base fabric made of polyester fibers had a tear strength slightly lower than that of the fabric having a base fabric made of polyamide fibers under the same conditions, but had almost no peeling strength between the single fiber bundles and water repellency, and had no problem of whitening by peeling.

(5) As is clear from comparative example and example 1, the water repellency of the fabric obtained by processing with a polyether urethane resin is comparable to that of the fabric obtained by processing with a polycarbonate urethane resin under the same conditions, and the former fabric has a deeper resin penetration at the yarn junction and a better tearing strength in the warp direction than the latter fabric, but the tearing strength in the weft direction is low, the peeling strength between fiber bundles is also low, and whitening occurs during peeling.