Paper plastic slurry, paper plastic products and paper plastic manufacturing process

Abstract

The invention relates to the field of paper plastics, and in particular to a paper plastic slurry, a paper plastic product and a paper plastic manufacturing process. The paper plastic slurry comprises fiber slurry and a plurality of additives. The paper plastic slurry is used to prepare the paper plastic product through pulping, slurry mixing, molding, shaping and the like. The paper plastic manufacturing process provided by the invention is simple, and the final paper plastic product has excellent strength and hardness, and excellent waterproof and moisture-proof performance. Each additive is added separately, and other additives are added after mixing for a certain period of time. Due to the different viscosities and surface charges of various additives and the different functions played by them, each additive is added according to the adding sequence of the invention, so that each additive can play a better effect. Through the coordination of a plurality of additives, the characteristics and functions of each additive are fully utilized, and the superposition of effects is achieved, so that the paper plastic product obtained by the paper plastic manufacturing process has excellent strength, hardness, waterproof and moisture-proof performance.

Description

Technical Field

[0001] The invention relates to the technical field of paper pulp molding, and in particular to a paper-plastic slurry, a paper-plastic product and a paper-plastic manufacturing process. Background Art

[0002] Pulp molding products are made of waste paper, bamboo pulp, sugarcane pulp, and wood pulp fibers. They are made into wet embryos through pulping, pulping, pulping, vacuum filtration, and hot pressing to form finished products. No adhesive is required in the production process of pulp molding products. They are formed only by the interaction between the fibers themselves and the structure of the mold itself. The paper molding process can manufacture paper molding products with various shapes and complex structures and high dimensional accuracy requirements. The obtained paper molding products are environmentally friendly and biodegradable.

[0003] In recent years, pulp molded products have been highly recommended by global environmental protection organizations due to their environmental protection characteristics, and have also been widely welcomed in the domestic industry. After several years of development and innovation, related process technologies have continued to advance, equipment performance has been improved, and production processes have been gradually improved, making product production costs more stable. It is expected that in the future, pulp molded products will gradually replace foam plastic products, which has become an inevitable trend.

[0004] However, pulp molded products tend to become soft after being placed for a period of time due to their thickness limitations and easy moisture absorption during use, resulting in a decrease in the product's supporting performance and affecting subsequent use.

[0005] Therefore, this field still needs a paper-plastic product with good water resistance, strength and hardness, and a paper-plastic product manufacturing process that can fundamentally solve the moisture absorption problem of paper-plastic products during use and further improve the strength and hardness of paper-plastic products. Summary of the invention

[0006] In view of this, the present invention aims to provide a paper-plastic pulp for producing paper-plastic products, by introducing wood pulp, reducing the proportion of bamboo pulp and increasing the proportion of sugarcane pulp, and introducing additives such as dispersants, calcium carbonate, wet strength agents, bactericides, stiffeners, pulp sizing agents and retention agents, and by optimizing the pulp formula and using various functional additives, the strength and hardness of the final paper-plastic product are greatly improved, and the moisture resistance during use is also excellent; the present invention also provides a paper-plastic process, by controlling the proportion of each pulp and the addition amount and order of each additive, each additive can be efficiently deposited on the surface of the pulp fiber, so that each additive can achieve a good effect, and the obtained paper-plastic product has excellent strength and hardness, and good moisture resistance, and can maintain strong supporting performance during use.

[0007] In order to solve the above technical problems, the present invention provides a paper-plastic slurry, comprising:

[0008] Fiber pulp, the fiber pulp includes wood pulp pulp, bamboo pulp pulp, sugarcane pulp pulp;

[0009] A variety of additives, including dispersants, calcium carbonate, wet strength agents, fungicides, stiffening agents, internal sizing agents and retention agents.

[0010] By optimizing the pulp ratio during the pulp preparation process: introducing wood pulp, reducing the proportion of bamboo pulp and increasing the proportion of sugarcane pulp, and introducing various additives such as dispersants, calcium carbonate, wet strength agents, bactericides, stiffeners, internal sizing agents and retention agents, the strength and hardness of the final paper-plastic product are greatly improved through the optimization of the pulp formula and the synergistic effect of various functional additives.

[0011] Furthermore, the plurality of additives, calculated by weight percentage of the fiber slurry, include:

[0012] 0.05-0.15% dispersant;

[0013] 3-12% calcium carbonate;

[0014] 3-7% wet strength agent;

[0015] 0.1-0.3% fungicide;

[0016] 0.2-1% stiffening agent;

[0017] 0.1-0.5% retention aid; and

[0018] 3-6% internal sizing agent.

[0019] The use of multiple additives in this ratio makes the final product have higher strength and hardness, and the product has better moisture resistance, which can ensure the support of the product during use.

[0020] Furthermore, the mass ratio of each pulp in the fiber pulp is wood pulp: bamboo pulp: sugarcane pulp = 2:1:2.

[0021] When this slurry ratio is used, the tensile strength and abrasion-resistant tearing strength of the paper-plastic product can be guaranteed, and the paper-plastic product can have a higher hardness.

[0022] Furthermore, the wet strength agent is a cationic wet strength agent;

[0023] The retention aid is a cationic retention aid;

[0024] The bactericide is a small molecule compound bactericide;

[0025] The stiffening agent is a cationic stiffening agent;

[0026] The internal sizing agent is a cationic internal sizing agent;

[0027] The dispersant is an anionic dispersant;

[0028] The calcium carbonate is heavy calcium carbonate.

[0029] By combining and selecting a variety of additives, utilizing the characteristics and functions of each additive, and superimposing the effects of various additives, the product has the characteristics of high hardness, high strength, and high moisture resistance.

[0030] Furthermore, the fiber slurry comprises, by weight:

[0031] 40 parts of sugarcane pulp;

[0032] 20 parts of bamboo pulp;

[0033] 40 parts of wood pulp slurry;

[0034] The multiple additives include by weight

[0035] 3.5 parts of cationic internal sizing agent;

[0036] 5.5 parts of cationic wet strength agent;

[0037] 0.1 parts of anionic dispersant;

[0038] 6.5 parts of heavy calcium carbonate;

[0039] 0.8 parts of cationic stiffening agent;

[0040] 0.16 parts of small molecule compound fungicide; and

[0041] 0.18 parts of cationic retention aid.

[0042] The paper plastic slurry adopts this ratio, and the paper plastic product (density: 0.74g / cm 3 , thickness: 0.96mm) has a tensile strength of 20.3N / mm and a bursting strength of 15.6Kgf / cm 2 , interlayer bonding strength is 325J / m 2 , tear strength is 5893mN, stiffness is 643mN / m, cobb value is 16.54g / m 2 The static contact angle is 133°. The obtained paper plastic product not only has excellent strength and hardness, but also has excellent waterproof and moisture resistance.

[0043] In order to further solve the above technical problems, the present invention also provides a paper plastic manufacturing process, comprising the following steps:

[0044] S1. Add papermaking white water to the pulping device, then add anionic dispersant, mix well, add heavy calcium carbonate, stir well, add wood pulp board to pulp, and obtain a first solution;

[0045] S2. adding a cationic retention agent to the first solution to obtain a second solution;

[0046] S3. Add papermaking white water to the pulping device, add a small molecule fungicide, stir and mix evenly, add bamboo pulp and sugarcane pulp to the pulping board to obtain a third solution;

[0047] S4. The second solution and the third solution are mixed to obtain a fourth solution, and a cationic stiffening agent is added to the fourth solution and then subjected to a refining step to obtain a fifth solution;

[0048] S5. Adding a cationic wet strength agent to the fifth solution to obtain a sixth solution;

[0049] S6. Adding a cationic sizing agent to the sixth solution to obtain a paper-plastic slurry;

[0050] S7. Based on the paper-plastic slurry, a paper-plastic manufacturing process is completed to obtain a paper-plastic product.

[0051] The paper-plastic manufacturing process provided by the present invention optimizes the pulp ratio: introduces wood pulp to replace part of bamboo pulp and sugarcane pulp, and increases the proportion of sugarcane pulp, thereby improving the strength and hardness of the paper-plastic product from the fiber level, adopts different additives, controls the addition order of each additive, and fully utilizes the performance of each additive, so that the effect of each additive in the paper-plastic process can be maximized, which not only improves the hardness index of the product, but also has excellent strength performance; at the same time, the waterproofness and moisture resistance of the paper-plastic product can also be greatly improved, and during use, the support of the paper-plastic product will not be reduced due to the thickness limitation and poor moisture resistance, which is not conducive to subsequent use; the moisture absorption problem of the paper-plastic product during use is solved, thereby expanding the use range of the paper-plastic product and reducing the use restrictions of the paper-plastic product.

[0052] Preferably, in step S1, the anionic dispersant needs to be diluted 50-80 times with clean water before adding.

[0053] The anionic dispersant at this concentration can disperse the fiber and calcium carbonate well without causing waste of the dispersant.

[0054] Furthermore, in step S2, the cationic retention aid needs to be diluted 30-50 times with clean water before addition, and the mixing time is controlled at 20-30 minutes.

[0055] Cationic retention aids at this concentration can play a good role in retention and filtration, preventing local over-concentration and excessive charge density from causing pulp to flocculate and affect uniformity; the retention aid is easily decomposable, and the mixing time of the retention aid is controlled to ensure its stability.

[0056] Furthermore, in step S3, the small molecule compound fungicide needs to be diluted 30-50 times with clean water before adding.

[0057] The fungicide at this concentration can not only achieve bactericidal and antibacterial effects, but also control costs.

[0058] In order to further solve the above technical problems, the present invention also provides a paper-plastic product, which is obtained based on the above paper-plastic slurry or prepared according to the above paper-plastic process.

[0059] The paper-plastic product obtained by the invention has good strength and hardness, good waterproofness and moisture resistance, wide application range and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0061] Figure 1 A process flow chart of a paper-plastic manufacturing process of the present invention;

[0062] Figure 2 The present invention is a process flow chart of a paper plastic manufacturing process. DETAILED DESCRIPTION

[0063] The content of the present invention is further described in detail below in conjunction with specific embodiments, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0064] Fiber pulp, the fiber pulp includes wood pulp pulp, bamboo pulp pulp, sugarcane pulp pulp;

[0065] A variety of additives, including dispersants, calcium carbonate, wet strength agents, fungicides, stiffening agents, internal sizing agents and retention agents.

[0066] By optimizing the pulp ratio during the pulp preparation process: introducing wood pulp, reducing the proportion of bamboo pulp and increasing the proportion of sugarcane pulp, and introducing various additives such as dispersants, calcium carbonate, wet strength agents, bactericides, stiffeners, internal sizing agents and retention agents, the strength and hardness of the final paper-plastic product are greatly improved through the optimization of the pulp formula and the use of various functional additives.

[0067] 1. As an excellent papermaking raw material, wood pulp has an average fiber length of 2-3μm, which is longer than the 1-2μm bamboo pulp fiber and 0.8-1.5μm sugarcane pulp fiber. The longer the pulp fiber, the higher the mechanical strength of the paper plastic product. Therefore, the tensile strength and abrasion tear strength of the paper plastic product will increase with the increase of wood pulp proportion. Sugarcane pulp contains a higher proportion of lignin and hemicellulose. After heating treatment, the lignin and hemicellulose are plasticized and fixed, making the paper plastic product have a higher hardness.

[0068] 2. The wet strength agent is adsorbed on the fiber surface and after heating, a spatial network structure is formed between the fibers, which restrains the movement and water absorption and swelling of the fibers. At the same time, as a thermosetting resin, the wet strength agent forms a hydrophobic spatial network structure after heating, which reduces the moisture absorption and wetting of the fibers and maintains a high strength of the product.

[0069] 3. Calcium carbonate, as a commonly used papermaking filler, gives the product high stiffness while having little effect on the physical strength of the product.

[0070] 4. Retention aids are mainly used to retain calcium carbonate on the fiber surface instead of losing it with papermaking white water. As a high-cationic charge and macromolecular polymer compound, retention aids can act as a bridge to connect calcium carbonate and fiber macromolecules and fine fibers into a spatial structure.

[0071] 5. Fungicides are mainly used to reduce the generation of rotten pulp during the production process, purify the entire papermaking white water system, and create a suitable working environment for various additives. Because rotten pulp is an anionic adhesive, it will consume a large amount of cationic additives, resulting in a high amount of additives used and a weakened effect.

[0072] 6. Stiffeners are mainly used to improve the hardness of paper and plastic products. Since the surface of stiffeners contains a large number of active groups such as hydroxyl, amide, and carboxyl, when added to the pulp, they are adsorbed on the fiber surface through charge adsorption and form a large number of hydrogen bonds with the hydroxyl groups on the fiber surface. During the drying process, a large number of cross-linking bonds are formed to achieve the purpose of improving the stiffness and hardness of the product.

[0073] 7. In-pulp sizing agent: the surface of the product is cationic starch or cationic etherifying agent, and the inside is coated with AKD wax powder, which is adsorbed on the fiber surface through positive and negative charges. When drying, as the temperature rises, the moisture content decreases, and the lactone ring on AKD reacts with the hydroxyl group on the fiber to form an esterification reaction, forming a covalent bond and fixing it on the fiber, forming a stable film on the fiber surface. The hydrophobic carbon chain faces outward, changing the fiber from hydrophilic to hydrophobic, thereby making the paper tray product water-resistant.

[0074] 8. The main function of the dispersant is to wet the calcium carbonate particles, prevent the flocculation and sedimentation of the calcium carbonate particles, and make it a stable suspension.

[0075] Secondly, the present invention also provides a paper-molding manufacturing process, such as Figure 2 As shown, the following steps are included:

[0076] S1. Add papermaking white water to the pulping device, then add anionic dispersant, mix well, add heavy calcium carbonate, stir well, add wood pulp board to pulp, and obtain a first solution;

[0077] S2. adding a cationic retention agent to the first solution to obtain a second solution;

[0078] S3. Add papermaking white water to the pulping device, add a small molecule fungicide, stir and mix evenly, add bamboo pulp and sugarcane pulp to the pulping board to obtain a third solution;

[0079] S4. The second solution and the third solution are mixed to obtain a fourth solution, and a cationic stiffening agent is added to the fourth solution and then subjected to a refining step to obtain a fifth solution;

[0080] S5. Adding a cationic wet strength agent to the fifth solution to obtain a sixth solution;

[0081] S6. Adding a cationic sizing agent to the sixth solution to obtain a paper-plastic slurry;

[0082] S7. Based on the paper-plastic slurry, a paper-plastic manufacturing process is completed to obtain a paper-plastic product.

[0083] It should be noted that the papermaking white water added in steps S1 and S3 is the water discharged from the mesh part of the forming machine in the back-end paper-plastic forming process, which generally contains fine short fibers and additives in the pulp. Figure 1 As shown, in the present application, papermaking white water is discharged from the rear-end forming machine and supplied to the front-end process for reuse.

[0084] The paper-plastic manufacturing process provided by the present invention optimizes the pulp ratio: introduces wood pulp to replace part of bamboo pulp and sugarcane pulp, and increases the proportion of sugarcane pulp, thereby improving the strength and hardness of the paper-plastic product from the fiber level, adopts different additives, controls the addition order of each additive, and fully utilizes the performance of each additive, so that the effect of each additive in the paper-plastic process can be maximized, which not only improves the hardness index of the product, but also has excellent strength performance; at the same time, the waterproofness and moisture resistance of the paper-plastic product can also be greatly improved, and during use, the support of the paper-plastic product will not be reduced due to the thickness limitation and poor moisture resistance, which is not conducive to subsequent use; the moisture absorption problem of the paper-plastic product during use is solved, thereby expanding the use range of the paper-plastic product and reducing the use restrictions of the paper-plastic product.

[0085] like Figure 1 As shown, the paper-plastic manufacturing process of the present invention comprises the following specific steps:

[0086] S1. Pulping of wood pulp: first add papermaking white water to the pulper, then add anionic dispersant diluted 50-80 times with clean water, stir for 2 minutes, add calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, mix evenly, then add wood pulp board to pulp, and obtain the first solution, and place the first solution in the storage tank I after pulping; the main function of the dispersant is to wet the calcium carbonate particles and prevent the flocculation and sedimentation of the calcium carbonate particles; the calcium carbonate particles are evenly dispersed in the papermaking white water after being treated with the dispersant, and the wood pulp board added thereafter is dispersed into a fiber suspension under the high-speed shearing action of the pulper blade, and mixed with the calcium carbonate particles into a uniform suspended whole;

[0087] S2. Add a cationic retention aid diluted 30-50 times with clean water to the first solution placed in the storage tank I after slurry dispersion, and mix well to obtain a second solution; the mixing time is controlled at 20-30 minutes. The retention aid, as a high molecular compound with strong positive charge, has a natural affinity for fibers and calcium carbonate with negative charges on the surface. Through the attraction of positive and negative charges, one end connects to the fiber macromolecule, and the other end connects to the fine fiber and calcium carbonate. The fine fiber, calcium carbonate, and fiber are adsorbed together to form a three-dimensional network space structure, and the calcium carbonate is retained in the three-dimensional network space composed of the fiber and the retention aid;

[0088] S3. Bamboo pulp and sugarcane pulp dispersing: first add papermaking white water to the dispersing machine, then add a small molecule compound fungicide diluted 30-50 times with clean water, stir for 5 minutes, mix well, add bamboo pulp and sugarcane pulp to dispersing, and obtain a third solution, and place the third solution in the storage tank II after dispersing;

[0089] As a small molecule compound, the fungicide is directly dissolved in the papermaking white water, the fiber surface is negatively charged, and the third solution is negatively charged as a whole;

[0090] S4. The second solution and the third solution are mixed evenly to obtain a fourth solution, the fourth solution is placed in a pre-refining storage barrel, a cationic stiffening agent diluted 50-80 times with clean water is added, stirred for 5 minutes, and then refined after mixing evenly to obtain a fifth solution, and the fifth solution is placed in a post-refining storage barrel; the fiber surface is negatively charged, the stiffening agent surface is positively charged, and the stiffening agent is adsorbed on the fiber surface by the attraction of positive and negative charges;

[0091] S5. Add a cationic wet strength agent diluted 10-20 times with clean water to the fifth solution in the storage barrel after refining, stir for 5 minutes, mix evenly to obtain a sixth solution, and place the sixth solution in a mixing barrel; the fiber surface has a negative charge, and after the refining treatment, more free anionic groups are exposed, and the wet strength agent has a positive charge and is adsorbed on the fiber surface by charge adsorption;

[0092] S6. Add a cationic internal sizing agent diluted 30-50 times with clean water to the sixth solution in the mixing barrel, stir for 5 minutes, and mix evenly to obtain a paper-plastic slurry; after the effects of the retention agent, stiffening agent and wet strength agent before and after pulping and refining, the fiber surface already has partial positive charge, and the internal sizing agent with positive charge is further added to further adsorb on the fiber surface, so that the calcium carbonate with weak anionic charge and all cationic additives can be adsorbed on the fiber surface;

[0093] S7. Dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then heat-press and shape it in a molding machine to form a paper-plastic product. The fibers and the anions and cations adsorbed on the fiber surface are heated to form a network structure that is spatially staggered and connected.

[0094] In the actual production process, the production batch is generally large. In order to ensure product quality and production continuity, it is necessary to continuously perform operations such as slurry dispersion, grinding, mixing, and molding. Therefore, after each step, corresponding containers (such as storage barrels, mixing barrels) are used for mixing or temporary storage to facilitate the continuous implementation of each process; in the process from the mixed liquid to the molding machine, it is necessary to dilute it and transfer it through the corresponding containers after dilution; using containers for mixing, storage, and transfer are all common technical means and cannot be used as a limitation to the technical solution of the present invention.

[0095] In the embodiments of the present invention, the following additives may be used:

[0096] 1. Dispersant: HH2003F from Guangzhou Houheng Chemical Additive Co., Ltd. or WS-2 from Weifang Jintai New Materials Co., Ltd.;

[0097] 2. Calcium carbonate: heavy calcium carbonate is used. Heavy calcium carbonate is composed of natural carbonate minerals, such as calcite, marble, and limestone ground and mixed; in this embodiment, heavy calcium carbonate: D90 <10μm, calcium content >95%, whiteness >94, such as 1250 mesh heavy calcium carbonate produced by Zibo Jianzhi Industry and Trade Co., Ltd. or 1500 mesh heavy calcium carbonate produced by Changxing Qingsheng Calcium Industry Co., Ltd.;

[0098] 3. Retention aid: XDAM-07 from Qingzhou Xindi Chemical Co., Ltd. or LSR-30 from Wuxi Tianxin Chemical Co., Ltd.;

[0099] 4. Wet strength agent: JH-1201 from Qingzhou Jinhao New Materials Co., Ltd. or AH-01 from Fengtai Environmental Protection Technology (Shandong) Co., Ltd.;

[0100] 5. Stiffener: D001 from Shandong Gaochao Energy Saving and Environmental Protection Technology Co., Ltd. or HD100 from Hangzhou Lin'an Funeng Resin Co., Ltd.;

[0101] 6. Fungicide: JH-8909B from Qingzhou Jinhao New Materials Co., Ltd. or D0025 from Shanghai Dejian Chemical Co., Ltd.;

[0102] 7. In-slurry sizing agent: JH-AKD200 from Qingzhou Jinhao New Materials Co., Ltd. or DH110 from Qingzhou Dehai Fine Chemicals Co., Ltd.

[0103] Through the combination of several additives and the optimization of the slurry formula, the addition amount and order of each fiber slurry and additives are controlled, and the characteristics of various fibers and the characteristics and functions of each additive are fully utilized to achieve the effects of high strength, high hardness and high moisture resistance.

[0104] The "portions" in the embodiments of the present invention are portions by mass, and the mass of each portion can be confirmed according to actual needs. For example, in each embodiment, each "portion" can be calibrated as 1Kg, and then 40 portions are 40Kg, 0.1 portion is 0.1Kg, and other portions by mass are the same.

[0105] Example 1

[0106] S1. Wood pulp dispersing: first add papermaking white water to the dispersing machine, then add 0.1 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 5 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and obtain the first solution, which is placed in the storage tank I after dispersing;

[0107] S2. Add 0.1 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 22 minutes to obtain a second solution;

[0108] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.1 parts of a small molecule compound fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0109] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 0.2 parts of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refined to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0110] S5. Add 5 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0111] S6. Add 4 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0112] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product A1.

[0113] Example 2

[0114] S1. Pulping of wood pulp: first add papermaking white water to the pulping machine, then add 0.15 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 10 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and obtain the first solution, which is placed in the storage tank I after pulping;

[0115] S2. Add 0.32 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 24 minutes to obtain a second solution;

[0116] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.2 parts of a small molecule compound fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0117] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 0.5 parts of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refining is performed to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0118] S5. Add 3 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0119] S6. Add 5 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0120] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product A2.

[0121] Example 3

[0122] S1. Wood pulp dispersing: first add papermaking white water to the dispersing machine, then add 0.05 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 3 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and obtain the first solution, which is placed in the storage tank I after dispersing;

[0123] S2. Add 0.1 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 22 minutes to obtain a second solution;

[0124] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.15 parts of a small molecule fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0125] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 0.7 parts of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refined to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0126] S5. Add 3 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0127] S6. Add 3 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0128] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform hot pressing and shaping in a molding machine to form a paper-plastic product A3.

[0129] Example 4

[0130] S1. Wood pulp dispersing: first add papermaking white water to the dispersing machine, then add 0.12 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 8 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and obtain the first solution, which is placed in the storage tank I after dispersing;

[0131] S2. Add 0.25 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 22 minutes to obtain a second solution;

[0132] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.2 parts of a small molecule compound fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0133] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 1.0 part of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refined to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0134] S5. Add 6 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0135] S6. Add 3 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0136] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform hot pressing and shaping in a molding machine to form a paper-plastic product A4.

[0137] Example 5

[0138] S1. Pulping of wood pulp: first add papermaking white water to the pulping machine, then add 0.15 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 12 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and slurry to obtain the first solution, and place the first solution in the storage tank I after slurrying;

[0139] S2. Add 0.5 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 25 minutes to obtain a second solution;

[0140] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.3 parts of a small molecule compound fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0141] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 0.8 parts of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refined to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0142] S5. Add 7 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0143] S6. Add 6 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0144] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform hot pressing and shaping in a molding machine to form a paper-plastic product A5.

[0145] Example 6

[0146] S1. Pulping of wood pulp: first add papermaking white water to the pulping machine, then add 0.1 parts of anionic dispersant diluted 60 times with clean water, stir for 2 minutes, add 6.5 parts of calcium carbonate with weak anions on the surface after mixing, stir for 10 minutes, add 40 parts of wood pulp board after mixing, and slurry to obtain the first solution, and place the first solution in the storage tank I after slurrying;

[0147] S2. Add 0.18 parts of a cationic retention agent diluted 40 times with water to the first solution placed in the slurry storage tank Ⅰ and mix for 25 minutes to obtain a second solution;

[0148] S3. Bamboo pulp and sugarcane pulp: first add papermaking white water to the pulper, then add 0.16 parts of a small molecule compound fungicide diluted 40 times with water, stir for 5 minutes, mix well, add 20 parts of bamboo pulp board and 40 parts of sugarcane pulp board to pulp, and obtain a third solution, and place the third solution in the storage tank II after pulping;

[0149] S4. The second solution and the third solution are mixed to obtain a fourth solution, the fourth solution is placed in a storage barrel before refining, 0.8 parts of a cationic stiffening agent diluted 65 times with water is added, stirred for 5 minutes, mixed and then refined to obtain a fifth solution, and the fifth solution is placed in a storage barrel after refining;

[0150] S5. Add 5.5 parts of a cationic wet strength agent diluted 15 times with water to the fifth solution placed in the storage barrel after refining, stir for 5 minutes, mix well to obtain a sixth solution, and place the sixth solution in a mixing barrel;

[0151] S6. Add 3.5 parts of a cationic sizing agent diluted 40 times with water to the sixth solution placed in the mixing barrel, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0152] S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product A6.

[0153] Comparative Example 1

[0154] S1. Bamboo pulp and sugarcane pulp slurry: Add papermaking white water to the pulper, add 35 parts of sugarcane pulp and 65 parts of bamboo pulp, and the solution obtained after slurrying is placed in a storage tank Ⅰ after slurrying;

[0155] S2. Refining solution Ⅰ to obtain solution Ⅱ, and placing solution Ⅱ in a storage barrel after refining;

[0156] S3. Place solution II in a mixing barrel, add 4 parts of a cationic sizing agent diluted 40 times with water, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0157] S4. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product B1.

[0158] Comparative Example 2

[0159] S1. Pulping of wood pulp: adding papermaking white water to a pulping machine, and then adding 40 parts of wood pulp board for pulping, and placing the obtained solution I in a storage tank I after pulping;

[0160] Bamboo pulp dispersing and sugarcane pulp dispersing: adding papermaking white water to a dispersing machine, and then adding 40 parts of bamboo pulp and 20 parts of sugarcane pulp to dispersing, and placing the obtained solution II in a storage tank II after dispersing;

[0161] S2. The solution Ⅰ and solution Ⅱ are mixed and refined to obtain a solution Ⅲ, and the solution Ⅲ is placed in a storage barrel after refining;

[0162] S3. Place solution III in a mixing barrel, add 4 parts of the sizing agent diluted 40 times with water to solution III, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0163] S4. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product B2.

[0164] Comparative Example 3

[0165] S1. Pulping of wood pulp: adding papermaking white water to a pulping machine, and then adding 40 parts of wood pulp board for pulping, and placing the obtained solution I in a storage tank I after pulping;

[0166] Bamboo pulp dispersing and sugarcane pulp dispersing: adding papermaking white water to a dispersing machine, and then adding 40 parts of bamboo pulp and 20 parts of sugarcane pulp to dispersing, and placing the obtained solution II in a storage tank II after dispersing;

[0167] S2. Solution I and solution II are mixed and subjected to refining treatment to obtain solution III, and solution III is placed in a storage barrel after refining; 2 parts of a cationic wet strength agent diluted 15 times with water are added to solution III in the storage barrel after refining, stirred for 5 minutes, and mixed evenly to obtain solution IV;

[0168] S3. Place solution IV in a mixing barrel, add 3 parts of the sizing agent diluted 40 times with water to solution IV, stir for 5 minutes, and mix well to obtain a paper-plastic slurry;

[0169] S4. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product B3.

[0170] The paper plastic products A1-A6 and B1-B3 prepared in the embodiment of the present invention were tested for hardness and strength, and the data are shown in Table 1; the waterproof performance of the paper plastic products A1-A6 and B1-B3 was tested by using a ZB-COBB125 COBB absorbency tester (Hangzhou Zhibang Automation Technology Co., Ltd.) according to GB-T 1540-2002_Determination of water absorption of paper and paperboard_Cobb method: time 60s, water temperature 23±1°C under normal pressure, and the Cobb values ​​were measured and shown in Table 1; the hydrophobic performance of the paper plastic products A1-A6 and B1-B3 was tested by using a SDC-100 contact angle tester (Dongguan Shengding Precision Instrument Co., Ltd.) according to YC / T 424-2011 Determination of surface wettability of cigarette paper contact angle method, and the contact angle data are shown in Table 1.

[0171]

[0172] As can be seen from Table 1, by comparing paper plastic products A1-A6 with B1-B3, under the condition of similar density and thickness, the paper plastic products obtained by the paper plastic process of the present invention have strong strength and hardness; the larger the Cobb value, the better the water absorption of the paper plastic product; compared with comparative examples 1-3, the Cobb value of embodiments 1-6 of the present invention is significantly reduced; the larger the contact angle, the stronger the hydrophobicity of the paper plastic product, and the contact angle of embodiments 1-6 of the present invention is significantly increased compared with comparative examples 1-3; it can be seen that the paper plastic products obtained by the paper plastic process of the present invention have good waterproof and moisture-proof properties; among them, the strength, hardness, waterproof and moisture-proof properties of the paper plastic product A6 obtained in Example 6 are all the best, therefore, the ratio of paper plastic slurry in Example 6 is the best.

[0173] It should be noted that the dispersant in the present invention includes but is not limited to the dispersant product used in the embodiments of the present invention, and any common anionic dispersants on the market can be used; the bactericide in the present invention includes but is not limited to the bactericide product used in the embodiments of the present invention, and any common small molecule compound bactericides on the market can be used; the wet strength agent in the present invention includes but is not limited to the wet strength agent product used in the embodiments of the present invention, and any common cationic wet strength agent on the market can be used; the retention agent in the present invention includes but is not limited to the retention agent product used in the embodiments of the present invention, and any common cationic retention agent on the market can be used; the stiffening agent in the present invention includes but is not limited to the stiffening agent product used in the embodiments of the present invention, and any common cationic stiffening agent on the market can be used; the in-slurry sizing agent in the present invention includes but is not limited to the in-slurry sizing agent product used in the embodiments of the present invention, and any common cationic in-slurry sizing agent on the market can be used; the heavy calcium carbonate in the present invention includes but is not limited to the heavy calcium carbonate product used in the embodiments of the present invention, and any common heavy calcium carbonate on the market can be used.

[0174] It should be noted that the various additives used in this application are not simply superimposed on performance. Due to the different viscosities and surface charges of various additives, as well as the different functions they play, each additive needs to be added separately, mixed evenly, and then the next additive is added. The order of adding the additives cannot be adjusted. If the order of addition is adjusted, the various additives in the entire system will not be able to be efficiently combined or efficiently deposited on the fiber surface, resulting in the weakening of the effects of some additives, and they will be lost with the papermaking white water and will not play a role.

[0175] It should be further explained that the fiber slurry in the embodiment of the present invention is initially in a dry pulp board state, and the "mass ratio, mass part" in the present invention corresponds to the dry weight of each fiber slurry and the initial state of each auxiliary product, and has nothing to do with the amount of water added and the dilution multiple. The dilution multiple of each auxiliary in the present invention includes but is not limited to the dilution multiple in the embodiment, and it is sufficient that each auxiliary can exert its effect.

[0176] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A paper plastic manufacturing process, characterized in that: Paper plastic pulp includes: Fiber slurry, the fiber slurry includes wood pulp slurry, bamboo pulp slurry, and sugarcane pulp slurry; the mass ratio of each slurry in the fiber slurry is wood pulp slurry: bamboo pulp slurry: sugarcane pulp slurry = 2:1:2; A plurality of additives, including a dispersant, calcium carbonate, a wet strength agent, a bactericide, a stiffening agent, an internal sizing agent and a retention agent; The various additives, calculated by weight percentage of the fiber slurry, include: 0.05-0.15% dispersant; 3-12% calcium carbonate; 3-7% wet strength agent; 0.1-0.3% fungicide; 0.2-1% stiffening agent; 0.1-0.5% retention aid; and 3-6% internal sizing agent; The wet strength agent is a cationic wet strength agent; The retention aid is a cationic retention aid; The bactericide is a small molecule compound bactericide; The stiffening agent is a cationic stiffening agent; The internal sizing agent is a cationic internal sizing agent; The dispersant is an anionic dispersant; The calcium carbonate is heavy calcium carbonate; The manufacturing process includes the following steps: S1. Add papermaking white water to the pulping device, then add anionic dispersant, mix well, add heavy calcium carbonate, stir well, add wood pulp board to pulp, and obtain a first solution; S2. adding a cationic retention agent to the first solution to obtain a second solution; S3. Add papermaking white water to the pulping device, add a small molecule fungicide, stir and mix evenly, add bamboo pulp and sugarcane pulp to the pulping board to obtain a third solution; S4. The second solution and the third solution are mixed to obtain a fourth solution, and a cationic stiffening agent is added to the fourth solution and then subjected to a refining step to obtain a fifth solution; S5. Adding a cationic wet strength agent to the fifth solution to obtain a sixth solution; S6. Adding a cationic sizing agent to the sixth solution to obtain a paper-plastic slurry; S7. dilute the paper-plastic slurry, form a wet embryo through vacuum filtration, and then perform heat pressing and shaping in a molding machine to form a paper-plastic product.

2. The paper-plastic manufacturing process according to claim 1, characterized in that: The fiber slurry comprises, by weight: 40 parts of sugarcane pulp; 20 parts of bamboo pulp; 40 parts of wood pulp slurry; The various additives include by weight: 3.5 parts of cationic internal sizing agent; 5.5 parts of cationic wet strength agent; 0.1 parts of anionic dispersant; 6.5 parts of heavy calcium carbonate; 0.8 parts of cationic stiffening agent; 0.16 parts of small molecule compound fungicide; and 0.18 parts of cationic retention aid.

3. The paper-plastic manufacturing process according to claim 1, characterized in that: In the step S1, the anionic dispersant needs to be diluted 50-80 times with clean water before adding.

4. The paper-plastic manufacturing process according to claim 1, characterized in that: In step S2, the cationic retention aid needs to be diluted 30-50 times with clean water before adding, and the mixing time is controlled at 20-30 minutes.

5. The paper-plastic manufacturing process according to claim 1, characterized in that: In step S3, the small molecule compound fungicide needs to be diluted 30-50 times with clean water before adding.

6. A paper-plastic product, wherein the paper-plastic product is prepared according to the paper-plastic manufacturing process according to any one of claims 1 to 5.

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