Tensile wear-resistant washable kraft paper and preparation process thereof

Abstract

The invention discloses tensile wear-resistant washable kraft paper and a preparation process thereof, and relates to the technical field of kraft paper. Comprising the following steps: 1, sequentially adding color paste, water-based acrylic resin, a preservative, a reinforcing agent, a softening agent, a curing agent and a waterproof agent into a solvent, and uniformly stirring to obtain sizing slurry; step 2, coating raw paper with the sizing agent, and sequentially carrying out extrusion, ultraviolet irradiation, primary drying, ironing and secondary drying, so as to obtain the tensile wear-resistant washable kraft paper. According to the application, the specific reinforcing agent and the waterproof agent are prepared and introduced into the sizing agent for sizing, so that the interface interaction between the sizing agent and the raw paper is effectively improved, and the flame retardant property is enhanced while the tensile strength and the wear resistance of the washed kraft paper are improved; the purpose of replacing plastic with paper, replacing leather with paper and replacing cloth with paper can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of kraft paper, in particular to a tensile and wear-resistant washed kraft paper and a preparation process thereof. Background Art

[0002] Washed kraft paper, also known as high-wet-strength imitation leather paper, is an environmentally friendly material made from natural fiber pulp. It has a texture close to leather and is widely used in packaging fields such as handbags, clothing tags, and notebook covers.

[0003] In general processes, in order to improve the tensile and wear resistance of washed kraft paper, a reinforcement layer is usually formed on the surface of the base paper through a sizing process, which effectively improves the comprehensive properties of washed kraft paper, such as toughness and strength. However, in the prior art, the sizing liquid is usually a substance with high viscosity such as polyvinyl alcohol, which has high viscosity and poor coating performance, and has limited improvement in the tensile properties of washed kraft paper; at the same time, functional additives such as flame retardants are usually introduced into the sizing liquid, but the introduction of various substances will cause compatibility and dispersion uniformity problems, resulting in the formation of a discontinuous film, which makes the wear resistance of washed kraft paper poor.

[0004] In summary, in order to solve the above problems, a tensile and wear-resistant washed kraft paper and its preparation process are prepared, which are of great significance. Summary of the invention

[0005] The object of the present invention is to provide a tensile and wear-resistant washed kraft paper and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A preparation process of tensile wear-resistant washed kraft paper, comprising the following steps: Step 1: Add color paste, water-based acrylic resin, preservative, enhancer, softener, curing agent and waterproofing agent to the solvent in sequence and stir evenly to obtain a sizing slurry; Step 2: Apply the sizing slurry on the base paper, and sequentially perform extrusion, ultraviolet light irradiation, first drying, ironing, and second drying to obtain tensile and wear-resistant washed kraft paper.

[0007] Among them, the extrusion pressure is 8 kg; the first drying temperature is 60-160°C; the ironing temperature is 70-170°C, and the second drying temperature is 80-180°C.

[0008] More optimally, the raw materials of the base paper include the following components: by weight, 85-95 parts of coniferous wood pulp, 5-15 parts of cotton pulp, 1-5 parts of acid-modified cellulose, and 1-5 parts of mercapto chitosan.

[0009] More optimally, the preparation method of the acid-modified cellulose is: adding bacterial cellulose, thiomalic acid, and tin chloride into deionized water and stirring evenly, storing the deionized water at a constant temperature of 80-100° C. for 36 hours, washing, and drying to obtain the acid-modified cellulose; The raw materials of acid-modified cellulose include the following components: by weight, 1-2 parts of bacterial cellulose, 3-6 parts of thiomalic acid, 0.001-0.002 parts of tin chloride, and 100-110 parts of deionized water.

[0010] More optimally, the sizing slurry includes the following raw materials in parts by weight: 0.5 to 10 parts of color paste, 20 to 50 parts of water-based acrylic resin, 0.1 to 5 parts of preservative, 0.1 to 10 parts of enhancer, 0.2 to 8 parts of softener, 0.1 to 5 parts of curing agent, 0.2 to 10 parts of waterproofing agent, and 2 to 30 parts of solvent.

[0011] More optimally, the sizing slurry includes the following raw materials in parts by weight: 2 to 3 parts of color paste, 35 to 40 parts of water-based acrylic resin, 1 to 2 parts of preservative, 10 to 15 parts of enhancer, 3 to 4 parts of softener, 1 to 2 parts of curing agent, 4 to 6 parts of waterproofing agent, and 20 to 30 parts of solvent.

[0012] Preferably, the reinforcing agent is a propylene-based organic framework, and the specific preparation method is: (1) Cyclodextrin and potassium hydroxide are sequentially added to deionized water and stirred evenly to obtain a precursor solution; the precursor solution is subjected to vapor diffusion at 50-52° C. for 10-12 hours using methanol vapor; polyethylene glycol is then added and stirred at room temperature for 10-12 hours, and the mixture is separated, washed, and dried to obtain a cyclodextrin organic framework; (2) Add the cyclodextrin organic framework to deionized water, add sodium hydroxide to adjust the pH to 9.5-10; add 2-chloroacetamide dropwise, stir at 40-45°C for 4-5 hours; heat to 90-95°C, stir for 10-15 minutes, cool, and wash to neutrality to obtain an amino organic framework; (3) Add the amino organic framework into deionized water, add 2-methylacrolein, stir at a temperature of 50-55° C. for 1-2 hours, wash and dry to obtain an acryl organic framework.

[0013] More optimally, the raw materials of the cyclodextrin organic framework include the following components, by weight, 12 to 13 parts of cyclodextrin, 4 to 5 parts of potassium hydroxide, 180 to 200 parts of deionized water, and 0.5 to 0.8 parts of polyethylene glycol; in the raw materials of the amino organic framework, the mass ratio of the cyclodextrin organic framework and 2-chloroacetamide is 1:0.8 to 1; in the raw materials of the acryl-modified organic framework, the mass ratio of the amino organic framework and 2-methylacrolein is 1:0.4 to 0.5.

[0014] More optimally, the waterproofing agent is mercapto chitosan, and its preparation method is: under a nitrogen atmosphere, chitosan is added to deionized water and stirred evenly, 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, acetylcysteine, mercapto-triethylene glycol-carboxylic acid, and decanoic acid are added, stirred for reaction for 24 hours in a dark environment, purified, and freeze-dried to obtain mercapto chitosan.

[0015] More optimally, the raw materials of the mercapto chitosan include the following components, by weight: 10 parts of chitosan, 7 to 8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, 4 to 5 parts of acetylcysteine, 3 to 5 parts of mercapto-triethylene glycol-carboxylic acid, and 8 to 12 parts of n-decanoic acid.

[0016] In a more optimized manner, the curing agent includes an organic peroxide curing agent and a photoinitiator; the solvent includes tetramethyldecynediol and deionized water in a mass ratio of 1:4; and the softener is aminopolysiloxane.

[0017] More optimally, a tensile wear-resistant washed kraft paper is prepared by a preparation process of the tensile wear-resistant washed kraft paper, wherein the basis weight of the base paper is 20-500 g / m 2 After the sizing slurry is sizing, the weight of the tensile wear-resistant washed kraft paper is 26~600g / m 2 .

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) The tensile and wear-resistant washed kraft paper prepared in the present application can achieve the purpose of replacing plastic, leather and cloth with paper.

[0019] (2) In this application, acid-modified cellulose is introduced into the base paper to effectively improve the tensile strength of the base paper. At the same time, it improves the sizing property of the subsequent sizing slurry, enhances the interfacial effect, and utilizes the dispersed cross-linking property of the reinforcing agent in the sizing slurry to comprehensively improve the tensile and wear resistance of the washed kraft paper.

[0020] Among them, acid-modified cellulose is obtained by modifying bacterial cellulose with thiomalic acid; bacterial cellulose is a highly crystalline substance, and its introduction can evenly bridge between fibers and play a reinforcing role; it can effectively improve the tensile strength and elastic modulus of the base paper. It can also increase the smoothness of the base paper and improve the coating film-forming property of the subsequent sizing slurry. The use of thiomalic acid modification can, firstly, improve the softness of the paper, and secondly, the acid modification produces an ester group, which can improve water resistance; thirdly, it contains a thiol group, which is conducive to cross-linking with the subsequent sizing slurry, promotes sizing performance, and improves the comprehensive performance of washed kraft paper.

[0021] In the (3) scheme, water-based acrylic resin is used as the main sizing raw material, and a specially prepared propylene-based organic framework is introduced as a reinforcing agent, and a specially prepared thiol chitosan is introduced as a waterproofing agent to effectively ensure cross-linking and film-forming properties, while enhancing flame retardancy, tensile strength and wear resistance.

[0022] Among them, the propylene organic framework is based on cyclodextrin. It is first prepared by using the methanol steam method with potassium hydroxide, and then modified by amino modification with 2-chloroacetamide, and then grafted with propylene by reacting 2-methylacrolein with amino groups to obtain the propylene organic framework. First, the cyclodextrin framework is a framework material with a special structure, which has excellent thermal stability and flame retardancy. Cyclodextrin is a friendly carbon layer that isolates oxygen and heat and inhibits combustion. The potassium ions it contains can promote the carbon layer and inhibit flames; it can cooperate with softeners (hydroxy silicone oil) and waterproofing agents (thiol chitosan) to achieve flame retardancy. Secondly, due to the subsequent grafting, it contains propylene groups, which can effectively react and crosslink with water-based acrylic resin to improve its uniform crosslinking; and the grafted chain segments produced by the subsequent two-step grafting effectively provide crosslinking toughness, inhibit the generation of stress cracks during drying, effectively improve the film-forming property of the surface, and improve the tensile properties; thirdly, the propylene-based organic framework is an organic-inorganic hybrid material, and it has reactive groups that can promote the degree of crosslinking, thereby improving the wear resistance of washed kraft paper.

[0023] Among them, mercapto chitosan is based on chitosan, and acetylcysteine, mercapto-triethylene glycol-carboxylic acid, and decanoic acid are grafted as grafted segments using the activation of 1-ethyl (3-dimethylaminopropyl)-3-carbodiimide hydrochloride; chitosan is a material with excellent film-forming properties, and the groups contained in its molecular chain can improve the bonding force between paper fibers and improve the tensile and wear resistance of paper. The ammonia and sulfur elements it contains can produce synergistic flame retardancy; the triethylene glycol contained improves the affinity with paper and improves the softness; and the decanoic acid with a higher grafting amount, due to the long-chain alkyl, effectively improves the waterproofness of kraft paper. It should be noted that in order to promote its uniformity of dispersion, tetramethyldecynediol is also introduced into the solvent to improve the dispersion and moldability, which improves the waterproofness while ensuring the tensile and wear resistance of kraft paper.

[0024] In summary, by preparing specific reinforcing agents and waterproofing agents and introducing them into the sizing slurry for sizing, the interfacial effect between the sizing slurry and the base paper is effectively improved, thereby improving the comprehensive performance of the washed kraft paper. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that the following parts are calculated by weight, and the purchase manufacturers of all raw materials involved in the present invention are exemplified without any special restrictions: in the following embodiments, the model of the water-based acrylic resin is Soluryl-90; the model of the hydroxy silicone oil is hydroxy silicone oil 209; the brand of the bacterial cellulose is Gadel; the deacetylation degree of the chitosan is ≥85%; the brand of the cyclodextrin is Proloff; and other raw materials are commercially purchased.

[0027] Example 1: A process for preparing tensile wear-resistant washed kraft paper, comprising the following steps: Pre-preparation: 1 part of bacterial cellulose, 3.2 parts of thiomalic acid, and 0.001 parts of tin chloride are added to 100 parts of deionized water and stirred evenly, and the mixture is kept at a constant temperature of 100° C. for 36 hours, washed, and dried to obtain acid-modified cellulose; The enhancer is an propylene-based organic framework, and the preparation method is as follows: (1) 12 cyclodextrins and 4.3 parts of potassium hydroxide are added to 180 parts of deionized water in sequence and stirred evenly to obtain a precursor solution; the precursor solution is subjected to vapor diffusion at 50°C for 12 hours using methanol vapor; then 0.6 parts of polyethylene glycol-20000 are added and stirred at room temperature for 12 hours, separated, washed, and dried to obtain a cyclodextrin organic framework; (2) 10 parts of the cyclodextrin organic framework are added to 100 parts of deionized water, sodium hydroxide is added to adjust the pH to 9.8; 9 parts of 2-chloroacetamide are added dropwise and stirred at 45 for 4 hours; the temperature is raised to 90°C and stirred for 15 minutes, cooled and washed to neutral to obtain an amino organic framework; (3) 10 parts of the amino organic framework are added to 50 parts of deionized water, 4.5 parts of 2-methylacrolein are added, stirred at 55°C for 1.5 minutes, washed, and dried to obtain an propylene-based organic framework; The waterproofing agent is mercapto chitosan, and the preparation method is as follows: under a nitrogen atmosphere, 10 parts of chitosan are added to 80 parts of deionized water and stirred evenly, 7.8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, 5 parts of acetylcysteine, 4 parts of mercapto-triethylene glycol-carboxylic acid, and 10 parts of n-decanoic acid are added, and stirred for reaction for 24 hours under light protection, purified, and freeze-dried to obtain mercapto chitosan; Step 1: 2.5 parts of color paste (iron oxide color paste), 40 parts of water-based acrylic resin, 1.5 parts of preservative (dimethylbenzamide), 8 parts of enhancer, 3.5 parts of softener (hydroxy silicone oil), 1.5 parts of curing agent (ammonium persulfate, tert-butyl hydroperoxide, azobisisobutyronitrile in a mass ratio of 0.5:0.8:0.2), and 5 parts of waterproofing agent are sequentially added to 25 parts of solvent (tetramethyldecynediol and deionized water in a mass ratio of 1:4), and stirred evenly at a speed of 1.5S / turn for 20 minutes to obtain a sizing slurry; Step 2: (1) 92 parts of softwood pulp, 8 parts of cotton pulp, 4 parts of acid-modified cellulose, and 4 parts of mercapto chitosan are mixed and beaten, and paper is formed on the net to obtain a paper with a basis weight of 300 g / m 2 (2) coating the sizing slurry on the base paper, extruding the sizing slurry in sequence, with an extrusion pressure of 8 kg, irradiating the sizing slurry under a 254 nm ultraviolet lamp for 15 minutes, drying the sizing slurry for the first time at 120°C, drying the sizing slurry at 150°C, and drying the sizing slurry for the second time at 180°C to obtain a sizing slurry with a weight of 400 g / m 2 Tensile and wear-resistant washed kraft paper.

[0028] Example 2: A process for preparing tensile wear-resistant washed kraft paper, comprising the following steps: Pre-preparation: 1 part of bacterial cellulose, 3.2 parts of thiomalic acid, and 0.001 parts of tin chloride are added to 100 parts of deionized water and stirred evenly, and the mixture is kept at a constant temperature of 100° C. for 36 hours, washed, and dried to obtain acid-modified cellulose; The enhancer is an propylene-based organic framework, and the preparation method is as follows: (1) 12 cyclodextrins and 4.3 parts of potassium hydroxide are added to 180 parts of deionized water in sequence and stirred evenly to obtain a precursor solution; the precursor solution is subjected to vapor diffusion at 50°C for 12 hours using methanol vapor; then 0.6 parts of polyethylene glycol-20000 are added and stirred at room temperature for 12 hours, separated, washed, and dried to obtain a cyclodextrin organic framework; (2) 10 parts of the cyclodextrin organic framework are added to 100 parts of deionized water, sodium hydroxide is added to adjust the pH to 9.8; 9 parts of 2-chloroacetamide are added dropwise and stirred at 45 for 4 hours; the temperature is raised to 90°C and stirred for 15 minutes, cooled and washed to neutral to obtain an amino organic framework; (3) 10 parts of the amino organic framework are added to 50 parts of deionized water, 4.5 parts of 2-methylacrolein are added, stirred at 55°C for 1.5 minutes, washed, and dried to obtain an propylene-based organic framework; The waterproofing agent is mercapto chitosan, and the preparation method is as follows: under a nitrogen atmosphere, 10 parts of chitosan are added to 80 parts of deionized water and stirred evenly, 7.8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, 5 parts of acetylcysteine, 4 parts of mercapto-triethylene glycol-carboxylic acid, and 10 parts of n-decanoic acid are added, and stirred for reaction for 24 hours under light protection, purified, and freeze-dried to obtain mercapto chitosan; Step 1: Add 2 parts of color paste (iron oxide color paste), 35 parts of water-based acrylic resin, 1 part of preservative (dimethylbenzamide), 10 parts of enhancer, 3 parts of softener (hydroxy silicone oil), 1.5 parts of curing agent (ammonium persulfate, tert-butyl hydroperoxide, azobisisobutyronitrile in a mass ratio of 0.5:0.8:0.2), and 4 parts of waterproofing agent to 20 parts of solvent (tetramethyldecynediol and deionized water in a mass ratio of 1:4), stir evenly at a speed of 1.5S / turn for 20 minutes to obtain a sizing slurry; Step 2: (1) 95 parts of softwood pulp, 5 parts of cotton pulp, 5 parts of acid-modified cellulose, and 3 parts of mercapto chitosan are mixed and beaten, and paper is formed on a net to obtain a paper having a basis weight of 300 g / m 2 (2) coating the sizing slurry on the base paper, extruding the sizing slurry in sequence, with an extrusion pressure of 8 kg, irradiating the sizing slurry under a 254 nm ultraviolet lamp for 15 minutes, drying the sizing slurry for the first time at 120°C, drying the sizing slurry at 150°C, and drying the sizing slurry for the second time at 180°C to obtain a sizing slurry with a weight of 400 g / m 2 Tensile and wear-resistant washed kraft paper.

[0029] Example 3: A process for preparing tensile wear-resistant washed kraft paper, comprising the following steps: Pre-preparation: 1 part of bacterial cellulose, 3.2 parts of thiomalic acid, and 0.001 parts of tin chloride are added to 100 parts of deionized water and stirred evenly, and the mixture is kept at a constant temperature of 100° C. for 36 hours, washed, and dried to obtain acid-modified cellulose; The enhancer is an propylene-based organic framework, and the preparation method is as follows: (1) 12 cyclodextrins and 4.3 parts of potassium hydroxide are added to 180 parts of deionized water in sequence and stirred evenly to obtain a precursor solution; the precursor solution is subjected to vapor diffusion at 50°C for 12 hours using methanol vapor; then 0.6 parts of polyethylene glycol-20000 are added and stirred at room temperature for 12 hours, separated, washed, and dried to obtain a cyclodextrin organic framework; (2) 10 parts of the cyclodextrin organic framework are added to 100 parts of deionized water, sodium hydroxide is added to adjust the pH to 9.8; 9 parts of 2-chloroacetamide are added dropwise and stirred at 45 for 4 hours; the temperature is raised to 90°C and stirred for 15 minutes, cooled and washed to neutral to obtain an amino organic framework; (3) 10 parts of the amino organic framework are added to 50 parts of deionized water, 4.5 parts of 2-methylacrolein are added, stirred at 55°C for 1.5 minutes, washed, and dried to obtain an propylene-based organic framework; The waterproofing agent is mercapto chitosan, and the preparation method is as follows: under a nitrogen atmosphere, 10 parts of chitosan are added to 80 parts of deionized water and stirred evenly, 7.8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, 5 parts of acetylcysteine, 4 parts of mercapto-triethylene glycol-carboxylic acid, and 10 parts of n-decanoic acid are added, and stirred for reaction for 24 hours under light protection, purified, and freeze-dried to obtain mercapto chitosan; Step 1: Add 3 parts of color paste (iron oxide color paste), 50 parts of water-based acrylic resin, 2 parts of preservative (dimethylbenzamide), 5 parts of enhancer, 4 parts of softener (hydroxy silicone oil), 1.5 parts of curing agent (ammonium persulfate, tert-butyl hydroperoxide, azobisisobutyronitrile in a mass ratio of 0.5:0.8:0.2), and 6 parts of waterproofing agent to 30 parts of solvent (tetramethyldecynediol and deionized water in a mass ratio of 1:4), stir evenly at a speed of 1.5S / turn for 20 minutes to obtain a sizing slurry; Step 2: (1) 85 parts of softwood pulp, 15 parts of cotton pulp, 3 parts of acid-modified cellulose, and 5 parts of mercapto chitosan are mixed and beaten, and paper is formed on a net to obtain a paper having a basis weight of 300 g / m 2 (2) coating the sizing slurry on the base paper, extruding the sizing slurry in sequence, with an extrusion pressure of 8 kg, irradiating the sizing slurry under a 254 nm ultraviolet lamp for 15 minutes, drying the sizing slurry for the first time at 120°C, drying the sizing slurry at 150°C, and drying the sizing slurry for the second time at 180°C to obtain a sizing slurry with a weight of 400 g / m 2 Tensile and wear-resistant washed kraft paper.

[0030] Comparative Example 1: Acid-modified cellulose is not introduced into the base paper; the rest is the same as Example 1; the specific differences are as follows: Step 2: (1) 92 parts of softwood pulp, 8 parts of cotton pulp, and 4 parts of mercapto chitosan are mixed and beaten, and paper is formed on the net to obtain a paper with a basis weight of 300 g / m 2 (2) coating the sizing slurry on the base paper, extruding the sizing slurry in sequence, with an extrusion pressure of 8 kg, irradiating the sizing slurry under a 254 nm ultraviolet lamp for 15 minutes, drying the sizing slurry for the first time at 120°C, drying the sizing slurry at 150°C, and drying the sizing slurry for the second time at 180°C to obtain a sizing slurry with a weight of 400 g / m 2 Tensile and wear-resistant washed kraft paper.

[0031] Comparative Example 2: In the sizing slurry, the waterproofing agent used was replaced with decyl chitosan; the rest was the same as Example 1; the specific differences were as follows: The waterproofing agent is decyl chitosan, and the preparation method is as follows: under a nitrogen atmosphere, 10 parts of chitosan are added to 80 parts of deionized water and stirred evenly, 7.8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride and 10 parts of n-decanoic acid are added, stirred and reacted for 24 hours in a dark environment, purified, and freeze-dried to obtain decyl chitosan.

[0032] Comparative Example 3: In the sizing slurry, a cyclodextrin organic framework is directly introduced as a reinforcing agent; the rest is the same as Example 1; the specific differences are as follows: Step 1: Add 2.5 parts of color paste (iron oxide color paste), 40 parts of water-based acrylic resin, 1.5 parts of preservative (dimethylbenzamide), 8 parts of cyclodextrin organic framework, 3.5 parts of softener (hydroxy silicone oil), 1.5 parts of curing agent (ammonium persulfate, tert-butyl hydroperoxide, azobisisobutyronitrile in a mass ratio of 0.5:0.8:0.2), and 5 parts of waterproofing agent to 25 parts of solvent (tetramethyldecynediol and deionized water in a mass ratio of 1:4), stir evenly at a speed of 1.5S / circle for 20 minutes to obtain a sizing slurry.

[0033] Comparative Example 4: In the sizing slurry, the amount of the reinforcing agent introduced is increased to 20 parts; the rest is the same as Example 1; the specific differences are as follows: Step 1: Add 2.5 parts of color paste (iron oxide color paste), 40 parts of water-based acrylic resin, 1.5 parts of preservative (dimethylbenzamide), 20 parts of enhancer, 3.5 parts of softener (hydroxy silicone oil), 1.5 parts of curing agent (ammonium persulfate, tert-butyl hydroperoxide, azobisisobutyronitrile in a mass ratio of 0.5:0.8:0.2), and 5 parts of waterproofing agent to 25 parts of solvent (tetramethyldecynediol and deionized water in a mass ratio of 1:4), stir evenly at a speed of 1.5S / circle for 20 minutes to obtain a sizing slurry.

[0034] Performance Test 1: The tensile and wear-resistant washed kraft paper prepared in the examples and comparative examples was tested for mechanical properties at a tensile strength of 20 mm / min using a 4.5×4.5 mm surface performance comprehensive tester in accordance with GB / T-12914 "Constant tension method (20 mm / min) for determination of tensile strength of paper and paperboard"; the sample width was 20 mm and the length was 250 mm. 2 The samples were subjected to wear rate testing.

[0035] sample Transverse tension kg Longitudinal tension kg Wear rate × 10-4mm3 / J Example 1 10.20 21.84 2.43 Example 2 9.80 21.03 2.54 Example 3 9.85 21.11 2.50 Comparative Example 1 9.38 20.57 2.56 Comparative Example 2 9.21 19.85 2.75 Comparative Example 3 8.96 19.38 2.82 Comparative Example 4 9.50 20.46 2.62 Conclusion: From the data in the above table, it can be seen that the present application prepared washed kraft paper with high tensile strength and wear resistance. From the data of Comparative Examples 1 to 4, it can be seen that the process and content of the specifically prepared acid-modified fiber, mercapto chitosan, and propylene organic framework in kraft paper are important; in Comparative Example 1, due to the lack of introduction of acid-modified cellulose, the mechanical properties and the like are reduced; in Comparative Example 2, due to the replacement of the waterproofing agent with decyl chitosan, the interfacial film-forming property is reduced, resulting in a reduction in related properties; in Comparative Example 3, due to the cyclodextrin organic framework, the cross-linking property is reduced, resulting in a reduction in performance; in Comparative Example 4, due to the increase in the content of the reinforcing agent, the strength is reduced.

[0036] Performance Test 2: Cut the tensile wear-resistant washed kraft paper of Example 1 into 6.5×100 mm 2 The samples were tested for limiting oxygen index using a digital oxygen index meter.

[0037] Results: The LOI value of Example 1 is 26.8%, indicating that the prepared tensile and wear-resistant washed kraft paper has flame retardancy.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing tensile wear-resistant washed kraft paper, characterized in that: The following steps are involved: Step 1: Add color paste, water-based acrylic resin, preservative, enhancer, softener, curing agent and waterproofing agent to the solvent in sequence and stir evenly to obtain a sizing slurry; Step 2: Apply the sizing slurry on the base paper, and sequentially perform extrusion, ultraviolet light irradiation, first drying, ironing, and second drying to obtain tensile and wear-resistant washed kraft paper.

2. The process for preparing the tensile wear-resistant washed kraft paper according to claim 1, characterized in that: The raw materials of the base paper include the following components: by weight, 85-95 parts of conifer pulp, 5-15 parts of cotton pulp, 1-5 parts of acid-modified cellulose, and 1-5 parts of mercapto chitosan.

3. The process for preparing the tensile wear-resistant washed kraft paper according to claim 2, characterized in that: The preparation method of the acid-modified cellulose is as follows: bacterial cellulose, thiomalic acid and tin chloride are added to deionized water and stirred evenly, the deionized water is kept at a constant temperature of 80-100° C. for 36 hours, washed and dried to obtain the acid-modified cellulose; The raw materials of acid-modified cellulose include the following components: by weight, 1-2 parts of bacterial cellulose, 3-6 parts of thiomalic acid, 0.001-0.002 parts of tin chloride, and 100-110 parts of deionized water.

4. The process for preparing the tensile wear-resistant washed kraft paper according to claim 1, characterized in that: The sizing slurry comprises the following raw materials in parts by weight: by weight, 0.5 to 10 parts of color paste, 20 to 50 parts of water-based acrylic resin, 0.1 to 5 parts of preservative, 0.1 to 10 parts of reinforcing agent, 0.2 to 8 parts of softener, 0.1 to 5 parts of curing agent, 0.2 to 10 parts of waterproofing agent, and 2 to 30 parts of solvent.

5. The process for preparing the tensile wear-resistant washed kraft paper according to claim 1, characterized in that: The reinforcing agent is a propylene-based organic framework, and the specific preparation method is: (1) Cyclodextrin and potassium hydroxide are sequentially added to deionized water and stirred evenly to obtain a precursor solution; the precursor solution is subjected to vapor diffusion at 50-52° C. for 10-12 hours using methanol vapor; polyethylene glycol is then added and stirred at room temperature for 10-12 hours, and the mixture is separated, washed, and dried to obtain a cyclodextrin organic framework; (2) Add the cyclodextrin organic framework to deionized water, add sodium hydroxide to adjust the pH to 9.5-10; add 2-chloroacetamide dropwise, stir at 40-45°C for 4-5 hours; heat to 90-95°C, stir for 10-15 minutes, cool, and wash to neutrality to obtain an amino organic framework; (3) Add the amino organic framework into deionized water, add 2-methylacrolein, stir at a temperature of 50-55° C. for 1-2 hours, wash and dry to obtain an acryl organic framework.

6. The process for preparing the tensile wear-resistant washed kraft paper according to claim 5, characterized in that: The raw materials of the cyclodextrin organic framework include the following components, measured by weight: 12 to 13 parts of cyclodextrin, 4 to 5 parts of potassium hydroxide, 180 to 200 parts of deionized water, and 0.5 to 0.8 parts of polyethylene glycol; in the raw materials of the amino organic framework, the mass ratio of the cyclodextrin organic framework to 2-chloroacetamide is 1:0.8 to 1; in the raw materials of the acryl-modified organic framework, the mass ratio of the amino organic framework to 2-methylacrolein is 1:0.4 to 0.

5.

7. The process for preparing the tensile wear-resistant washed kraft paper according to claim 1, characterized in that: The waterproofing agent is mercapto chitosan, and the preparation method thereof is as follows: under a nitrogen atmosphere, chitosan is added to deionized water and stirred evenly, 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, acetylcysteine, mercapto-triethylene glycol-carboxylic acid, and n-decanoic acid are added, stirred and reacted for 24 hours in a dark environment, purified, and freeze-dried to obtain mercapto chitosan.

8. The process for preparing the tensile wear-resistant washed kraft paper according to claim 7, characterized in that: The raw materials of the mercapto chitosan include the following components, by weight: 10 parts of chitosan, 7-8 parts of 1-ethyl (3-dimethylaminopropyl) -3-carbodiimide hydrochloride, 4-5 parts of acetylcysteine, 3-5 parts of mercapto-triethylene glycol-carboxylic acid, and 8-12 parts of n-decanoic acid.

9. The process for preparing the tensile wear-resistant washed kraft paper according to claim 1, characterized in that: The curing agent includes an organic peroxide curing agent and a photoinitiator; and the solvent includes tetramethyldecynediol and deionized water in a mass ratio of 1:

4.

10. The tensile-wear-resistant washed kraft paper prepared by the process for preparing the tensile-wear-resistant washed kraft paper according to any one of claims 1 to 9 is characterized in that: The base paper has a basis weight of 20-500 g / m 2 After the sizing slurry is sizing, the weight of the tensile wear-resistant washed kraft paper is 26~600g / m 2 .