A flexible foldable spray-painted wall cloth and its preparation method

Abstract

The present application discloses a flexible, foldable, spray-painted wall covering and a preparation method thereof, belonging to the technical field of wall coverings. The wall covering comprises a first ink-absorbing coating, a base fabric layer, a second ink-absorbing coating, and an anti-sticking covering coating, which are laminated in sequence. The base fabric layer is a woven fabric. The first ink-absorbing coating and / or the second ink-absorbing coating comprise the following raw materials in parts by weight: 100 parts of an aqueous polyurethane emulsion, 1000-2000 parts of water, 4-10 parts of a stilbene derivative whitening agent, and 0.5-1 part of a sodium salt of dioctyl sulfonated succinate penetrant. The anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of a modified acrylic latex, 30-50 parts of nano-grade talc, 150-170 parts of kaolin, 100-120 parts of water, 4-6 parts of a polycarboxylate ammonium salt dispersant, 10-20 parts of an aqueous polymer modified wax, and 10-20 parts of a polyurethane thickener. This wall cloth product overcomes the shortcomings of wall cloth in the existing technology, has the advantages of flexibility and foldability, and is compatible with weak solvent, UV, Latex, and thermal transfer inkjet printing methods.

Description

Technical Field

[0001] The present application relates to a flexible foldable spray-painted wall cloth and a preparation method thereof, belonging to the technical field of wall cloth. Background Art

[0002] The existing wall coverings on the market are mainly divided into three categories: the first is PVC embossed wall covering, which contains a high amount of VOC and is not environmentally friendly; the other is foam flocking wall covering, whose foam coating has low adhesion and is easy to fall off; the last is composite wall covering, whose composite strength is greatly affected by the amount of glue applied during bonding. If the amount of glue is insufficient, it is very easy to bulge.

[0003] Due to the rapid development of the logistics industry, the demand for express delivery of wall coverings is increasing. During express delivery, wall coverings inevitably need to be folded to save space and facilitate transportation. However, existing wall coverings are often too stiff. Once folded, the wrinkles created by the folds are difficult to undo, making it difficult to undo them. Even if they can be unfolded, the surface of the wall covering is significantly affected, hindering subsequent spraying and use.

[0004] Therefore, in view of the current need for folding wall cloth in express logistics, there is an urgent need for a wall cloth that is foldable and recoverable, and is also compatible with weak solvents, UV, Latex, thermal transfer inkjet printing and other methods. Summary of the Invention

[0005] In order to solve the above problems, a flexible foldable spray-painted wall cloth and a preparation method thereof are provided. The flexible foldable spray-painted wall cloth uses a polyester chemical fiber base material, does not contain PVC, and is therefore highly environmentally friendly. The back of the base cloth is sanded, and then a coating process is used to improve the adhesion strength of the glutinous rice glue during construction. The coating and the base cloth are highly integrated, and bulging and delamination are not prone to occur. In addition, by adopting the back-sanding process, the production cost is reduced by about 20% compared with traditional wall cloth. Most importantly, the flexible foldable spray-painted wall cloth is highly soft, and the folds can be easily opened after folding, which does not affect the resumption of use after folding, and can be conveniently folded and transported.

[0006] According to one aspect of the present application, a flexible foldable inkjet-printed wall covering is provided, wherein the inkjet-printed wall covering comprises an ink-absorbing first coating layer, a base fabric layer, an ink-absorbing second coating layer, and an anti-sticking covering coating layer laminated in sequence;

[0007] The base fabric layer is a woven fabric;

[0008] The ink-absorbing first coating and / or the ink-absorbing second coating comprises the following raw materials in parts by weight: 100 parts of aqueous polyurethane emulsion, 1000-2000 parts of water, 4-10 parts of stilbene derivative whitening agent, and 0.5-1 part of sodium salt of dioctyl sulfonated succinate penetrant;

[0009] The anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of modified acrylic latex, 30-50 parts of nano-grade talc, 150-170 parts of kaolin, 100-120 parts of water, 4-6 parts of polycarboxylate ammonium salt dispersant, 10-20 parts of water-based polymer modified wax, and 10-20 parts of polyurethane thickener.

[0010] Optionally, the base fabric layer is a woven fabric interwoven with DTY polyester fibers.

[0011] Optionally, one side of the anti-sticking covering coating of the base fabric layer is subjected to a grinding and roughening treatment, and a grinding layer is further included between the ink absorbing second coating and the anti-sticking covering coating.

[0012] Optionally, the base fabric layer is subjected to sanding and napping treatments to control the nap length to be 1 to 2 mm.

[0013] Optionally, the base fabric layer uses yarns with a density of 300-1000D.

[0014] According to another aspect of the present application, a method for preparing a flexible foldable spray-painted wall covering is provided, the method comprising the following steps:

[0015] S1. Use DTY polyester fiber woven fabric as the base fabric layer, sand and brush one side, and control the length of the pile to 1-2mm. Refine the surface hair to remove the oil and rust, and then dry it.

[0016] S2. After uniformly mixing, by weight, 100 parts of an aqueous polyurethane emulsion, 1000-2000 parts of water, 4-10 parts of a distyrene derivative whitening agent, and 0.5-1 part of a sodium salt of dioctyl sulfosuccinate penetrant, to prepare a dipping coating, the dipping coating is applied to both sides of the base fabric layer, with the amount of the coating being controlled to be 60-70% of the dry weight of the base fabric layer, followed by drying and crosslinking.

[0017] S3. Mix 100 parts of modified acrylic latex, 30-50 parts of nano-grade talc, 150-170 parts of kaolin, 100-120 parts of water, 4-6 parts of polycarboxylate ammonium salt dispersant, and 10-20 parts of water-based polymer modified wax, and then add 10-20 parts of polyurethane thickener to adjust the viscosity to 5000-7000 cps and the solid content to 47-57% to obtain an anti-sticking covering coating. Apply the anti-sticking covering coating to the sanded side of the base fabric layer, and then dry and cross-link it to obtain the flexible foldable spray-painted wall cloth.

[0018] Optionally, in the refining process in step S1, the temperature of the flat cylinder is set to 85-95° C., and the refining time is 7-9 hours.

[0019] Optionally, in the refining treatment in step S1, the radial pre-shrinkage rate is 5-8%, and the vehicle speed is 10-30 m / min.

[0020] Optionally, the drying temperature in step S1 is 75-95°C; optionally, after the cloth is taken out, a water suction machine is first used to remove residual water, and then 5 rollers are used for drying, and the temperatures are set to 80°C, 90°C, 90°C, 90°C, and 80°C in sequence; optionally, the vehicle speed is 20m / min.

[0021] Optionally, the drying temperature in step S2 is 150-220°C; optionally, the drying and cross-linking are carried out in 10 ovens in step S2, and the temperatures are set to 150°C, 180°C, 200°C, 220°C, 220°C, 210°C, 200°C, 180°C, and 150°C in sequence.

[0022] Optionally, in step S2, the base fabric layer is completely covered with the coating, and the vehicle speed is 10 to 20 m / min.

[0023] Optionally, the drying temperature in step S3 is 90-160°C; optionally, 10 sections of an oven are used for drying, cross-linking and curing, and the temperatures are set to 90°C, 100°C, 120°C, 150°C, 160°C, 160°C, 160°C, 150°C, 130°C and 100°C in sequence.

[0024] Optionally, the thickness of the anti-sticking covering coating is 30 to 60 μm.

[0025] Optionally, in step S3, the wet weight of the anti-sticking covering coating is 100-150 gsm, and the coating speed is 30-40 m / min.

[0026] The beneficial effects of this application include but are not limited to:

[0027] 1. According to the flexible foldable spray-painted wall cloth of the present application, the base cloth provided by the present invention is pre-sanded and brushed to form a 1-2mm fluff layer on the surface, which increases the density of the fabric on the back, and then undergoes a refining treatment to remove the floating hair on the surface and the oil and rust stains on the yarn. Combined with the anti-sticking masking coating at the back, the masking power of the product is effectively increased. Compared with traditional laminated non-woven fabrics, the mixed coating formed by the soft fluff layer and the anti-sticking masking coating is a whole with the base cloth layer, which can effectively eliminate the delamination and bulging during the construction process caused by the bonding strength.

[0028] 2. According to the flexible foldable spray-painted wall cloth of the present application, the ink absorption coating treatment process provided by the present invention, the coating will not change the surface style and softness of the original substrate, giving the product a good style, and can accept UV, weak solvent, Latex, and thermal transfer ink imaging, and the setting temperature of 220°C can ensure the dimensional stability of the product during high-temperature printing.

[0029] 3. The flexible, foldable, spray-painted wallcovering of this application utilizes a non-stick, concealing coating process that effectively enhances the product's concealing power and allows for a transfer process at 220°C without sticking to the paper or shedding of the coating. After coating, a fleece layer ensures a smooth application, while rice glue provides excellent adhesion to the wall and effectively prevents glue seepage.

[0030] 4. According to the flexible foldable spray-painted wall cloth of the present application, the coating process provided by the present invention can reduce the cost of traditional wall cloth by 20%. Among them, the dip coating replaces the traditional wall cloth primer and top coating process, which can reduce the production material cost, process cost, and labor cost by a total of 15%. The back brushing and coating process replaces the traditional wall cloth flocking or lamination process, which can reduce the production material cost, process cost, and labor cost by a total of 5%.

[0031] 5. The flexible, foldable, spray-painted wall covering of this application utilizes a coating process that results in a soft product with high adhesion between the base fabric and the coating. This allows for foldable delivery, resolving the costly and repetitive roll-up transportation issues of traditional wall coverings. Conventional roll-up transportation results in high packaging costs and is long, making transportation difficult. However, the product prepared in this solution can be folded and shipped, and wrinkles quickly recover when applied to the wall, minimizing user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 This is a structural diagram of the flexible foldable spray-painted wall cloth involved in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The present application is described in detail below with reference to examples, but the present application is not limited to these examples. Unless otherwise specified, the raw materials and catalysts in the examples of the present application are purchased through commercial channels.

[0035] Example 1

[0036] A flexible, foldable, spray-painted wall covering comprises a first ink-absorbing coating, a base fabric layer, a second ink-absorbing coating, a sanded layer, and an anti-sticking covering coating laminated in sequence; the base fabric layer is a woven fabric interwoven with DTY polyester fibers; the first ink-absorbing coating and the second ink-absorbing coating comprise the following raw materials in parts by weight: 100 parts of aqueous polyurethane emulsion, 1500 parts of water, 7 parts of a distyrene derivative whitening agent, and 0.8 parts of a sodium salt penetrant of dioctyl sulfonated succinate; and the anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of modified acrylic latex, 40 parts of nano-grade talc powder, 160 parts of kaolin, 110 parts of water, 5 parts of a polycarboxylic acid ammonium salt dispersant, 15 parts of an aqueous polymer modified wax, and 15 parts of a polyurethane thickener.

[0037] The preparation steps of the flexible foldable spray-painted wall cloth include the following processes:

[0038] (1) Preparation of base fabric layer

[0039] The woven fabric is made of DTY low-elastic micro-networked polyester filaments with a yarn thickness of 300D to 1000D, interwoven with warp and weft threads. The base fabric layer is first sanded and brushed on one side with steel needles to a nap length of 1-2mm. It then undergoes a flat-cylinder refining treatment for oil, dirt, and rust removal, and is then dried online. The flat-cylinder temperature is set at 90°C, and the radial pre-shrinkage is controlled at 5-8% during the refining process. The machine speed is 20m / min, and the refining time is 8 hours. Upon exiting the fabric, a water extractor is used to remove any residual water. Drying is then performed on five rollers, set at temperatures of 80°C, 90°C, 90°C, 90°C, and 80°C, respectively, at a speed of 20m / min.

[0040] (2) Preparation of ink absorbing coating

[0041] The coating was prepared by uniformly mixing 100 parts of an aqueous polyurethane emulsion, 1500 parts of water, 7 parts of a stilbene derivative whitening agent, and 0.8 parts of a sodium salt of dioctyl sulfosuccinate penetrant, by weight. A three-stage continuous dipping process was employed, with the liquid content controlled at 60-70% of the substrate's dry weight. The ink-absorbing coating completely covered the base fabric layer at a speed of 15 m / min. The coating was then dried and crosslinked in a 10-stage oven, with temperatures set sequentially at 150°C, 180°C, 200°C, 220°C, 220°C, 220°C, 210°C, 200°C, 180°C, and 150°C.

[0042] (3) Preparation of anti-sticking covering coating

[0043] 100 parts by weight of modified acrylic latex, 40 parts of nano-grade talc, 160 parts of kaolin, 110 parts of water, 5 parts of polycarboxylic acid ammonium salt dispersant, and 15 parts of water-based polymer modified wax were mixed uniformly. 15 parts of polyurethane thickener was added to adjust the viscosity to 5000-7000 cps at 60 rpm, and the solid content to 52% ± 5%. The mixture was then applied to the brushed surface of a base fabric using a 1 mm blade knife. The wet weight was 130 gsm, the coating speed was 35 m / min, and the coating thickness was 45 μm. The mixture was cross-linked and cured in a 10-section oven at temperatures set sequentially at 90°C, 100°C, 120°C, 150°C, 160°C, 160°C, 150°C, 130°C, and 100°C. After drying, the flexible foldable inkjet-printed wall covering was obtained.

[0044] Example 2

[0045] A flexible, foldable, spray-painted wall covering comprises an ink-absorbing first coating, a base fabric layer, an ink-absorbing second coating, a brushed layer, and an anti-sticking covering coating laminated in sequence; the base fabric layer is a woven fabric interwoven with DTY polyester fibers; the ink-absorbing first coating and the ink-absorbing second coating comprise the following raw materials in parts by weight: 100 parts of aqueous polyurethane emulsion, 2000 parts of water, 10 parts of a distyrene derivative whitening agent, and 1 part of a sodium salt of dioctyl sulfonated succinate penetrant; the anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of modified acrylic latex, 50 parts of nano-grade talc powder, 170 parts of kaolin, 120 parts of water, 6 parts of a polycarboxylic acid ammonium salt dispersant, 20 parts of an aqueous polymer modified wax, and 20 parts of a polyurethane thickener.

[0046] The preparation steps of the flexible foldable spray-painted wall cloth include the following processes:

[0047] (1) Preparation of base fabric layer

[0048] The woven fabric is made of DTY low-elastic micro-networked polyester filaments with a yarn thickness of 300D to 1000D, interwoven with warp and weft threads. The base fabric layer is first sanded and brushed on one side with steel needles to a nap length of 1-2mm. It then undergoes a flat-cylinder refining treatment for oil, dirt, and rust removal, and is then dried online. The flat-cylinder temperature is set at 90°C, with a radial pre-shrinkage of 5% and a machine speed of 10m / min for 7 hours. Upon exiting the fabric, a water extractor is used to remove any residual water. Drying is then performed on five rollers, set at temperatures of 80°C, 90°C, 90°C, 90°C, and 80°C, respectively, at a machine speed of 20m / min.

[0049] (2) Preparation of ink absorbing coating

[0050] The coating was prepared by uniformly mixing 100 parts of an aqueous polyurethane emulsion, 2,000 parts of water, 10 parts of a distyrene derivative whitening agent, and 1 part of a sodium salt of dioctyl sulfosuccinate penetrant, by weight. A three-stage continuous dipping process was employed, with the liquid content controlled at 60-70% of the substrate's dry weight. The ink-absorbing coating completely covered the base fabric layer at a speed of 10 m / min. The coating was then dried and crosslinked in a 10-stage oven, with temperatures set sequentially at 150°C, 180°C, 200°C, 220°C, 220°C, 220°C, 210°C, 200°C, 180°C, and 150°C.

[0051] (3) Preparation of anti-sticking covering coating

[0052] 100 parts by weight of modified acrylic latex, 50 parts of nano-grade talc, 170 parts of kaolin, 120 parts of water, 6 parts of polycarboxylic acid ammonium salt dispersant, and 20 parts of water-based polymer modified wax were mixed uniformly. 20 parts of polyurethane thickener were added, and the viscosity was adjusted to 5000-7000 cps at 60 rpm, with a solid content of 52% ± 5%. The mixture was applied to the brushed surface of the base fabric using a 1 mm blade knife with a wet weight of 100 gsm, a coating speed of 30 m / min, and a coating thickness of 30 μm. The mixture was cross-linked and cured in a 10-section oven at temperatures set sequentially at 90°C, 100°C, 120°C, 150°C, 160°C, 160°C, 150°C, 130°C, and 100°C. After drying, the flexible foldable inkjet-printed wall covering was obtained.

[0053] Example 3

[0054] A flexible and foldable spray-painted wall covering comprises an ink-absorbing first coating, a base fabric layer, an ink-absorbing second coating, a sanded layer, and an anti-sticking covering coating, which are laminated in sequence. The base fabric layer is a woven fabric interwoven with DTY polyester fibers. The ink-absorbing first coating and the ink-absorbing second coating comprise the following raw materials in parts by weight: 100 parts of aqueous polyurethane emulsion, 1000 parts of water, 4 parts of a distilbene derivative whitening agent, and 0.5 parts of a sodium salt of dioctyl sulfonated succinate penetrant. The anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of modified acrylic latex, 30 parts of nano-grade talc powder, 150 parts of kaolin, 100 parts of water, 4 parts of a polycarboxylate ammonium salt dispersant, 10 parts of an aqueous polymer modified wax, and 10 parts of a polyurethane thickener.

[0055] The preparation steps of the flexible foldable spray-painted wall cloth include the following processes:

[0056] (1) Preparation of base fabric layer

[0057] The woven fabric is made of DTY low-elastic micro-networked polyester yarn with a yarn thickness of 300D to 1000D, interwoven with warp and weft threads. The base fabric layer is first sanded and brushed on one side with steel needles to a nap length of 1-2mm. It is then refined on a flat cylinder for degreasing, stain removal, and rust removal, and then dried online. The flat cylinder temperature is set at 90°C, and the refining process has a radial pre-shrinkage of 8%. The speed is 30m / min, and the refining time is 9 hours. Upon exiting the fabric, a water extractor is used to remove any residual water. Drying is then performed on five rollers, with the temperatures set at 80°C, 90°C, 90°C, 90°C, and 80°C, respectively, at a speed of 20m / min.

[0058] (2) Preparation of ink absorbing coating

[0059] The coating was prepared by uniformly mixing 100 parts of an aqueous polyurethane emulsion, 1000 parts of water, 4 parts of a stilbene derivative whitening agent, and 0.5 parts of a sodium salt of dioctyl sulfosuccinate penetrant, by weight. A three-stage continuous dipping process was employed, with the liquid content controlled at 60-70% of the substrate's dry weight. The ink-absorbing coating completely covered the base fabric layer at a speed of 20 m / min. The coating was then dried and crosslinked in a 10-stage oven, with temperatures set sequentially at 150°C, 180°C, 200°C, 220°C, 220°C, 220°C, 210°C, 200°C, 180°C, and 150°C.

[0060] (3) Preparation of anti-sticking covering coating

[0061] 100 parts by weight of modified acrylic latex, 30 parts of nano-grade talc, 150 parts of kaolin, 100 parts of water, 4 parts of polycarboxylic acid ammonium salt dispersant, and 10 parts of water-based polymer modified wax were mixed uniformly. 10 parts of polyurethane thickener was added to adjust the viscosity to 5000-7000 cps, the solid content to 52%±5%, and the mixture was applied to the brushed surface of the base fabric using a 1mm blade coating method. The wet weight was 150 gsm, the coating speed was 40 m / min, and the coating thickness was 60 μm. The mixture was cross-linked and cured in a 10-section oven at temperatures set sequentially at 90°C, 100°C, 120°C, 150°C, 160°C, 160°C, 150°C, 130°C, and 100°C. After drying, the flexible foldable inkjet wall covering was obtained.

[0062] Example 4

[0063] This solution is basically the same as that of Example 1, except that the drying temperature conditions for preparing the ink absorbing coating in step (2) of this embodiment are different, specifically:

[0064] The coating was prepared by uniformly mixing 100 parts of an aqueous polyurethane emulsion, 1500 parts of water, 7 parts of a stilbene derivative whitening agent, and 0.8 parts of a sodium salt of dioctyl sulfosuccinate penetrant, by weight. A three-stage continuous dipping process was employed, with the liquid content controlled at 60-70% of the substrate's dry weight. The ink-absorbing coating completely covered the base fabric layer at a speed of 15 m / min. The coating was then dried and crosslinked in a 10-stage oven, with temperatures set sequentially at 140°C, 160°C, 180°C, 200°C, 200°C, 190°C, 180°C, 160°C, and 140°C.

[0065] Example 5

[0066] This solution is basically the same as that of Example 1, except that the drying temperature conditions for preparing the ink absorbing coating in step (2) of this embodiment are different, specifically:

[0067] The coating was prepared by uniformly mixing 100 parts of an aqueous polyurethane emulsion, 1500 parts of water, 7 parts of a stilbene derivative whitening agent, and 0.8 parts of a sodium salt of dioctyl sulfosuccinate penetrant, by weight. A three-stage continuous dipping process was employed, with the liquid content controlled at 60-70% of the substrate's dry weight. The ink-absorbing coating completely covered the base fabric layer at a speed of 15 m / min. The coating was then dried and crosslinked in a 10-stage oven, with temperatures set sequentially at 160°C, 180°C, 200°C, 220°C, 240°C, 240°C, 220°C, 210°C, 180°C, and 160°C.

[0068] Example 6

[0069] This solution is basically the same as that of Example 1, except that the drying temperature conditions for preparing the anti-sticking covering coating in step (3) of this embodiment are different, specifically:

[0070] 100 parts by weight of modified acrylic latex, 40 parts of nano-grade talc, 160 parts of kaolin, 110 parts of water, 5 parts of polycarboxylic acid ammonium salt dispersant, and 15 parts of water-based polymer modified wax were mixed uniformly. 15 parts of polyurethane thickener was added to adjust the viscosity to 5000-7000 cps at 60 rpm, and the solid content to 52% ± 5%. The mixture was then applied to the brushed surface of a base fabric using a 1 mm blade knife with a wet weight of 130 gsm, a coating speed of 35 m / min, and a coating thickness of 45 μm. The mixture was cross-linked and cured in a 10-section oven at temperatures set sequentially to 70°C, 80°C, 100°C, 120°C, 130°C, 130°C, 130°C, 120°C, 110°C, and 90°C. After drying, the flexible foldable inkjet-printed wall covering was obtained.

[0071] Example 7

[0072] This solution is basically the same as that of Example 1, except that the drying temperature conditions for preparing the anti-sticking covering coating in step (3) of this embodiment are different, specifically:

[0073] 100 parts by weight of modified acrylic latex, 40 parts of nano-grade talc, 160 parts of kaolin, 110 parts of water, 5 parts of polycarboxylic acid ammonium salt dispersant, and 15 parts of water-based polymer modified wax were mixed uniformly. 15 parts of polyurethane thickener was added to adjust the viscosity to 5000-7000 cps at 60 rpm, and the solid content to 52% ± 5%. The mixture was then applied to the brushed surface of a base fabric using a 1 mm blade knife with a wet weight of 130 gsm, a coating speed of 35 m / min, and a coating thickness of 45 μm. The mixture was cross-linked and cured in a 10-section oven at temperatures set sequentially to 90°C, 110°C, 140°C, 170°C, 180°C, 180°C, 160°C, 140°C, and 120°C. After drying, the flexible foldable spray-painted wall covering was obtained.

[0074] Example 8

[0075] This solution is basically the same as the solution in Example 1, except that the thickness of the anti-sticking covering coating in this embodiment is 20 μm.

[0076] Example 9

[0077] This solution is basically the same as the solution in Example 1, except that the thickness of the anti-sticking covering coating in this embodiment is 80 μm.

[0078] Comparative Example 1

[0079] This solution is basically the same as the solution in Example 1, except that the base fabric layer in this comparative example is a woven fabric made of POY polyester fibers.

[0080] Comparative Example 2

[0081] This solution is basically the same as the solution in Example 1, except that the base fabric layer in this comparative example is a woven fabric made of FDY polyester fibers.

[0082] Comparative Example 3

[0083] This solution is basically the same as the solution in Example 1, except that the ink-absorbing first coating and the ink-absorbing second coating in this comparative example do not contain sodium salt of dioctyl sulfonate succinate penetrant.

[0084] Comparative Example 4

[0085] This solution is basically the same as that of Example 1, except that the anti-sticking covering coating in this comparative example does not contain water-based polymer modified wax.

[0086] Comparative Example 5

[0087] This solution is basically the same as that of Example 1, except that in this comparative example, during the preparation of the base fabric layer in step (1), no sanding or roughening treatment is performed.

[0088] Comparative Example 6

[0089] This solution is basically the same as that of Example 1, except that in this comparative example, the yarn thickness of the DTY low-elastic micro-network node polyester fiber yarn in the base fabric layer in step (1) is selected to be 1200-1500D.

[0090] Comparative Example 7

[0091] This solution is basically the same as that of Example 1, except that in this comparative example, the yarn thickness of the DTY low-elastic micro-network node polyester fiber yarn in the base fabric layer in step (1) is selected to be 50-200D.

[0092] Comparative Example 8

[0093] This solution is basically the same as that of Example 1, except that in this comparative example, the length of the fluff in the napping treatment in step (1) is controlled to be 0.3 to 0.8 mm.

[0094] Comparative Example 9

[0095] This solution is basically the same as that of Example 1, except that in this comparative example, the length of the fluff in the napping treatment in step (1) is controlled to be 2.4 to 2.8 mm.

[0096] Comparative Example 10

[0097] This solution is basically the same as the solution in Example 1, except that in this comparative example, when the coating material is dip-coated on both sides of the base fabric layer in step (2), the amount of the upper liquid is controlled to be 30-50% of the dry weight of the base fabric layer.

[0098] Comparative Example 11

[0099] This solution is basically the same as the solution in Example 1, except that in this comparative example, when the coating material is dip-coated on both sides of the base fabric layer in step (2), the amount of the upper liquid is controlled to be 75-85% of the dry weight of the base fabric layer.

[0100] Test Example 1

[0101] In this test example, the wall cloth products prepared in Examples 1 to 9 and Comparative Examples 1 to 11 were subjected to performance tests, including REACH (EC) NO1907 / 2006 regulation test, wrinkle resistance (GB / T 29257-2012) performance, opacity (GB / T 1543-1988) performance, product viscosity (220°C 45s) performance, product heat shrinkage (220°C 45s) performance, dry abrasion resistance after printing (ASMF1319) performance, and wet abrasion resistance after printing (ASMF1319) performance. The results of each performance test are shown in Table 1 below.

[0102] Table 1 Performance test results of wall coverings of embodiment and comparative example

[0103]

[0104]

[0105] REACH (EC) is related to the product's formulation system. The coatings used in the examples and comparative examples of this application have been strictly controlled, so all products have passed REACH (EC) testing, which is unattainable with products using oil-based coating systems in the prior art. The product substrate, coating formulation, and product preparation conditions can affect the product's wrinkle resistance. DTY yarn is elastic and has good wrinkle resistance, followed by POY, and FDY has the worst wrinkle resistance. For the same yarn, the greater the D number, the worse the wrinkle resistance. For anti-stick coatings with the same glass transition temperature and the same latex and powder ratio, the higher the coating thickness, the higher the shielding power, and the worse the wrinkle resistance. For ink-absorbing coatings, under the same latex conditions, the greater the amount of glue applied, the worse the wrinkle resistance.

[0106] For opacity, it is mainly affected by the substrate and release coating formula adopted. The larger the D number of the substrate, the higher the relative opacity, and the larger the release coating thickness, the higher the shielding power. Under the same thickness conditions, the higher the powder content, the higher the shielding power of the product will be improved. For the viscosity of the product, ink absorption coating and release coating have the greatest impact. The lower the glass transition temperature (TG value) of the ink absorption coating latex, the anti-sticking effect will deteriorate, and the increase in the amount of glue will cause the anti-sticking effect to deteriorate. The lower the glass transition temperature of the latex of the release coating, the worse the anti-sticking effect of the product, and the lower the powder content, the worse the anti-sticking effect. For, product heat shrinkage performance, it is mainly affected by the temperature of substrate pre-shrinkage and processing. The larger the substrate pre-shrinkage is, the smaller the product heat shrinkage is, and the higher the coating temperature in the processing, the smaller the product heat shrinkage is. For dry and wet grinding resistance after printing, it is mainly affected by the ink coating latex formula and dosage, and also has a certain relationship with the preparation conditions of the product.

[0107] From the analysis of the results in Table 1, it can be seen that the product of the embodiment of the present application scheme has excellent dry and wet abrasion resistance after printing, as well as excellent product adhesion performance. The transfer paper can be easily peeled off and has good anti-wrinkle performance. Since the present application scheme needs to solve the problem in the prior art that the product has poor folding resistance and cannot be folded for express transportation, it requires better anti-wrinkle performance. The base material combination used in the formula of the present application scheme can obtain better anti-wrinkle performance. At the same time, since the express transportation process after the product is folded is more complicated than the batch transportation of the product without folding, better wear resistance is required, especially dry abrasion resistance. Through the optimization of the formula and the optimization of the preparation conditions, the products of Examples 1 to 3 obtained in this scheme can simultaneously take into account good wear resistance and anti-wrinkle performance.

[0108] Test Example 2

[0109] The following tests were conducted on the wall cloth products in the examples and comparative examples. The test results are shown in Table 2 below. Flexing resistance test: (1) Take a portion of the sample that is free of creases, discoloration, or other damage. The sample size is 70 mm × 45 mm, and three samples are taken in each of the longitudinal and transverse directions of the sample; (2) Use a folding tester, adjust the positions of the upper and lower clamps, fold the coating surface inward, place one end of the sample in the clamp and clamp it, then fold the sample so that the other end turns downward, fold the coating surface outward, and clamp it in the lower clamp, ensuring that the fold line is vertical, then clamp the other end of the sample and keep it naturally straight; (3) The clamp is initially set to 1000 flexing times. After the flexing times are completed, the clamp stops flexing; (4) Remove the sample and visually inspect and use a magnifying glass to check for damage to the portion other than that clamped by the clamp under light of not less than 600 lx: the damage conditions include cracks in the coating, blistering between the coating and the fabric, delamination between the coating and the fabric, shedding of the coating, and other damage conditions. Crease recovery angle test: The test is carried out in accordance with the method specified in GB / T 3819-1997 "Determination of crease recovery of textile fabrics - Recovery angle method".

[0110] Glue penetration test: (1) Take the part of the sample that is not creased, not damaged, and has a uniform coating. Take three samples from the left, middle, and right sides of the wall cloth. The left and right samples should be cut 10 cm away from the edge of the wall cloth. The size of each sample is 300mm×450mm. When cutting, the long side of the sample is parallel to the longitudinal direction of the wall cloth, and the short side is parallel to the transverse direction of the wall cloth. (2) Use a wet film applicator to apply a 20μm layer of glutinous rice glue on the non-printing surface of the sample. (3) Clamp the sample with a clip and hang it vertically for 30 minutes. Observe whether there are any wet spots on the front (printing surface). If there are wet spots, it is unqualified.

[0111] Bulging and delamination test: (1) Take the part of the sample that is not creased, not damaged, and has a uniform coating. Take three samples from the left, middle, and right sides of the wall cloth. The left and right samples should be cut 10 cm away from the edge of the wall cloth. The size of each sample is 300mm×450mm. When cutting, the long side of the sample is parallel to the longitudinal direction of the wall cloth, and the short side is parallel to the transverse direction of the wall cloth. (2) Place the sample in 25℃ tap water and soak for 12 hours. (3) Take out and clamp the upper end of the sample with a clip, hang it to dry, and observe whether the material has delamination, bulging, or coating shedding. If delamination, bulging, or coating shedding occurs, it is unqualified.

[0112] Table 2

[0113] serial number Anti-bending effect Crease recovery angle Whether there is bulging and stratification Whether glue seepage Example 1 No damage 260° no no Example 2 No damage 275° no no Example 3 No damage 252° no no Example 4 No damage 265° no no Example 5 Cracks in the coating 225° no Glue seepage Example 6 No damage 265° no no Example 7 No damage 258° no no Example 8 No damage 280° no Glue seepage Example 9 No damage 245° no no Comparative Example 1 Coating cracking 230° no no Comparative Example 2 Coating cracking 225° no no Comparative Example 3 No damage 282° no Glue seepage Comparative Example 4 No damage 260° Coating bulging Glue seepage Comparative Example 5 Slight peeling of coating 185° Coating peeling Glue seepage Comparative Example 6 No damage 262° no no Comparative Example 7 No damage 258° no no Comparative Example 8 Slight peeling of coating 205° Coating bulging Glue seepage Comparative Example 9 No damage 260° no no Comparative Example 10 No damage 270° no no Comparative Example 11 No damage 245° no no

[0114] For flex resistance and crease recovery angle performance, the priority relationship among base fabric yarns is: DTY>POY>FDY. The larger the D number of the base fabric yarn, the larger the crease recovery angle, while high processing temperature will cause the crease recovery angle to become smaller. In addition, the larger the dry weight of the ink absorption coating and the anti-stick covering coating, the smaller the crease recovery angle. The bulging and delamination performance is mainly related to the adhesion of the anti-stick covering coating. The addition of water-based polymer modified wax in this solution can improve the waterproof performance, thereby having an isolation effect and helping to reduce the phenomenon of bulging and delamination. Furthermore, grinding and roughening the DTY base fabric can improve the spreading, shielding and adhesion of the coating, which helps to avoid bulging and delamination, and also reduces the occurrence of glue seepage.

[0115] Analysis of the results in Table 2 shows that the products of the embodiments of the present application exhibit both flex resistance and crease recovery performance, and do not exhibit issues such as bulging, delamination, or adhesive seepage. However, Examples 5 and 8, Comparative Examples 1-5, and Comparative Example 8 failed the test in Test Example 2 of this application, and the crease recovery angles of Examples 9 and Comparative Example 11 were relatively small, indicating poor recovery from external forces and unsuitable application in foldable spray-painted wall coverings.

[0116] Based on the performance test results in Test Example 1 and Test Example 2, the wall cloth provided in the embodiment of the present application has good anti-wrinkle and anti-bending effects, as well as good wear resistance. During use, the transfer paper can be easily peeled off and the occurrence of bulging, delamination and glue seepage problems can be reduced. It is very suitable for the preparation of flexible and foldable spray-painted wall cloth. The wall cloth prepared by this solution can adapt to the needs of folding express transportation, and has been tested to be compatible with different spraying methods such as weak solvents, UV, Latex, and thermal transfer inks.

[0117] The foregoing is merely an embodiment of the present application, and the scope of protection of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the technical ideas and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A flexible foldable spray-painted wall covering, characterized in that: The inkjet wall covering comprises an ink-absorbing first coating, a base fabric layer, an ink-absorbing second coating and an anti-sticking covering coating which are laminated in sequence. One side of the anti-sticking covering coating of the base fabric layer is subjected to a sanding and napping treatment. The nap length of the base fabric layer after the sanding and napping treatment is controlled to be 1 to 2 mm. The base fabric layer is a woven fabric made of DTY polyester fibers, and the yarn used in the base fabric layer is 300-1000D; The ink-absorbing first coating and / or the ink-absorbing second coating comprises the following raw materials in parts by weight: 100 parts of aqueous polyurethane emulsion, 1000-2000 parts of water, 4-10 parts of stilbene derivative whitening agent, and 0.5-1 part of sodium salt of dioctyl sulfonated succinate penetrant; The anti-sticking covering coating comprises the following raw materials in parts by weight: 100 parts of modified acrylic latex, 30-50 parts of nano-grade talc, 150-170 parts of kaolin, 100-120 parts of water, 4-6 parts of polycarboxylate ammonium salt dispersant, 10-20 parts of water-based polymer modified wax, and 10-20 parts of polyurethane thickener. The thickness of the anti-sticking covering coating is 30-60 μm.

2. The method for preparing the flexible foldable spray-painted wall cloth according to claim 1, wherein: The preparation method comprises the following steps: S1. Use DTY polyester fiber woven fabric as the base fabric layer, sand and brush one side, and control the length of the pile to 1-2mm. Refine the surface hair to remove the oil and rust, and then dry it. S2. After uniformly mixing, by weight, 100 parts of an aqueous polyurethane emulsion, 1000-2000 parts of water, 4-10 parts of a distyrene derivative whitening agent, and 0.5-1 part of a sodium salt of dioctyl sulfosuccinate penetrant, to prepare a dipping coating, the dipping coating is applied to both sides of the base fabric layer, with the amount of the coating being controlled to be 60-70% of the dry weight of the base fabric layer, and then dried and cross-linked; S3. Mix 100 parts of modified acrylic latex, 30-50 parts of nano-grade talc, 150-170 parts of kaolin, 100-120 parts of water, 4-6 parts of polycarboxylate ammonium salt dispersant, and 10-20 parts of water-based polymer modified wax, and then add 10-20 parts of polyurethane thickener to adjust the viscosity to 5000-7000 cps and the solid content to 47-57% to obtain an anti-sticking covering coating. Apply the anti-sticking covering coating to the sanded side of the base fabric layer, and then dry and cross-link it to obtain the flexible foldable spray-painted wall cloth.

3. The preparation method according to claim 2, characterized in that The drying temperature in step S1 is 75-95°C.

4. The preparation method according to claim 2, characterized in that The drying temperature in step S2 is 150-220°C.

5. The preparation method according to claim 2, characterized in that The drying temperature in step S3 is 90-160°C.

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