Modified slurry and paper-plastic product thereof

Abstract

The invention provides modified pulp and a paper-plastic product thereof. The modified pulp comprises 100 parts of paper pulp; and 0.01 to 20 parts of an additive. The additive at least comprises a biomass material, the biomass material comprises a component A, and the component A is selected from one or two of a biomass base material or a cationized biomass base material; the biomass base material and the cationized biomass base material are respectively of a dendritic structure, a fibrous structure, a sheet structure, a pinnate structure, a flocculent structure or a porous spongy structure. The modified slurry and the paper-plastic product thereof have good biodegradability, and meet the high efficiency of the technological process on the basis of having good mechanical properties, wear resistance and surface appearance properties.

Description

Technical Field

[0001] The invention belongs to the field of papermaking, and in particular relates to a pulp molding product. Background Art

[0002] With the improvement of environmental protection requirements, non-degradable plastic materials have been gradually replaced by pulp molding products in green packaging fields such as tableware and daily chemicals. Pure pulp has poor mechanical strength, wear resistance and surface properties, and cannot be directly used to manufacture disposable tableware. However, due to the improvement of the biodegradability of materials required by environmental protection, the need to prepare environmentally friendly and high-performance paper-plastic products is an urgent problem to be solved. Summary of the invention

[0003] In view of this, the present invention provides a modified pulp and a paper-plastic product thereof, which has good biodegradability, and meets the high efficiency of the process flow on the basis of having good mechanical properties, wear resistance and surface appearance properties.

[0004] In a first aspect, the present invention provides a modified slurry, comprising:

[0005] (iii) 100 parts of paper pulp; and,

[0006] (iv) 0.01-20 parts of additives;

[0007] The additive includes at least one biomass material, the biomass material includes component A, and the component A is selected from one or both of a biomass substrate or a cationic biomass substrate; the biomass substrate and the cationic biomass substrate both have a dendritic, fibrous, flaky, feathery, flocculent or porous sponge-like structure.

[0008] Preferably, the pulp is selected from at least one of wood pulp, bamboo pulp, reed pulp, sugarcane pulp, chemical pulp, chemimechanical pulp, mechanical pulp or waste paper pulp.

[0009] Preferably, the pulp is at least one of chemical-mechanical pulp or bamboo-sugarcane mixed pulp.

[0010] Preferably, the biomass in the biomass substrate or the cationized biomass substrate is selected from at least one of cellulose, refined cotton, absorbent cotton or wood pulp.

[0011] Preferably, the size of the biomass substrate or the cationized biomass substrate is 100-500 μm, preferably 150-350 μm.

[0012] Preferably, the amount of the biomass material is 1-10 parts, preferably 2-5 parts, relative to 100 parts of pulp.

[0013] Preferably, the biomass material also includes component B, and the component B is selected from at least one of polyhydroxyalkanoate (PHA), alkyl ketene dimer (AKD), polyglycolic acid (PGA), polylactic acid (PLA), polybutylene terephthalate-adipate (PBAT), cellulose ester or cellulose ether, and preferably component B is selected from PHA and / or AKD.

[0014] Preferably, the additives also include other additives, and the other additives are selected from at least one of the following: water and / or oil resistance agents, wet strength agents, dry strength agents, coagulants, sizing agents, pigments and / or dyes, preservatives or dispersants.

[0015] Preferably, the additive does not contain wet strength agents, sizing agents and / or mineral fillers.

[0016] In a second aspect, the present invention provides a paper-plastic product comprising the modified pulp described in any one of the above items.

[0017] In a third aspect, the present invention further provides a paper-plastic product, which is prepared from the modified pulp described in any one of the above items.

[0018] Beneficial Effects

[0019] The surface of the biomass material of the present invention has a high specific surface area and rich structural groups, and can combine with adjacent fibers to generate more hydrogen bonds, thereby enhancing the bonding force between adjacent fibers, thereby improving the tearing strength, tensile strength and other strengths of the paper; in addition, due to the small particle size and high strength of the biomass material, it can play a certain filling or supporting role in the network structure formed by the interweaving of pulp fibers, enrich the internal microstructure of the paper, and ultimately improve the tightness, stiffness, and ring crush strength of the paper, and reduce the porosity, gas permeability, wear resistance and other properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A typical electron microscope schematic diagram of the biomass substrate of the present invention.

[0021] Figure 2 : Schematic diagram of the wear resistance test results of Example 3 and Example 4 of the present invention. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0023] The "parts", "parts by weight" or "%" in the present invention refer to parts by mass or wt% unless otherwise specified. The content ratio of a substance is the weight ratio when no specific content is specified.

[0024] The implementation of the present invention is described in detail below in conjunction with the definitions of terms:

[0025] I modified slurry

[0026] The modified pulp of the present invention comprises: 100 parts of pulp and 0.01-20 parts of additives.

[0027] (i) Pulp

[0028] The pulp used in the present invention is not particularly limited, and can be at least one of wood pulp, bamboo pulp, reed pulp, sugarcane pulp, chemical pulp, chemimechanical pulp, mechanical pulp or waste paper pulp. Chemical pulp, chemimechanical pulp or mechanical pulp can be bleached or unbleached, and waste paper pulp can be from old newspapers, old magazines, old corrugated paper or deinked waste paper.

[0029] In some embodiments, the content of the pulp of the present invention in the modified pulp is 75-95% or 85-95%, for example, it can be 77%, 82%, 87%, 90%, etc.

[0030] (ii) Additives

[0031] ①Biomass materials

[0032] The additive of the present invention includes at least one biomass material. The biomass material includes at least component A, and the component A is selected from one or two of a biomass substrate or a cationized biomass substrate; and may also include component B, and the component B includes at least one of PHA, AKD, PGA, PLA, PBAT, cellulose ester or cellulose ether, and preferably component B includes PHA and / or AKD.

[0033] In component A:

[0034] Biomass substrate or cationized biomass substrate:

[0035] In some embodiments, the biomass substrate of the present invention may be a regenerated natural polymer (eg, type II cellulose, or a mixture of type II cellulose and type I cellulose).

[0036] In some embodiments, the cationized biomass substrate of the present invention may be selected from a biomass substrate modified with glycidyltrimethylammonium chloride or 3-chloro-2-hydroxypropyl-trimethylammonium chloride.

[0037] The biomass substrate or the cationized biomass substrate includes a micro-scale structure I and a nano-scale structure II distributed on the micro-scale structure.

[0038] The size of the biomass substrate or cationized biomass substrate of the present invention is a volume average size.

[0039] In some embodiments, the content of the biomass substrate or cationic biomass substrate in the biomass material additive is 0.01-10%, 0.1-5% or 0.5-2%, for example, it can be 0.2%, 0.6%, 1.0%, 1.2%, 1.5%, 1.8%, 2.5% or 3%, etc.

[0040] In some embodiments, the biomass substrate or the cationized biomass substrate is derived from at least one of the following biomasses: cellulose or its derivatives, starch or its derivatives, chitosan or its derivatives, chitin, alginate, lignin, glucan, hemicellulose, straw, plant stems and leaves, reeds, bagasse, Chinese medicine residues, tea residues, corn cobs, fruit shells, vines or branches. For example, the biomass is selected from at least one of cellulose, bacterial cellulose, lignin, cotton pulp, wood pulp, bamboo pulp, grass pulp, refined cotton, cotton wool, cotton linters, bagasse, wood or straw, etc.; preferably, at least one of cellulose, refined cotton, cotton wool or wood pulp.

[0041] In some embodiments, the size of the biomass substrate or the cationic biomass substrate (i.e., the volume average size) is 100μm-500μm, 120μm-400μm or 150μm-350μm, for example, it can be at least one of 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 290μm or 300μm.

[0042] In some embodiments, the size of the structure I of the biomass substrate or the cationized biomass substrate is 5 μm to 500 μm, preferably 10 μm to 400 μm, and further preferably, the size of the micron-sized structure is 30 μm to 300 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm m, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm, 185μm, 190μm, 195μm, 200μm, 21 At least one of 0 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm, 300 μm, 350 μm, 400 μm, 450 μm, and 500 μm.

[0043] In some embodiments, the length of the nanoscale structure II of the biomass substrate or the cationized biomass substrate is 500nm to 1500nm, for example, it can be at least one of 500nm, 600nm, 700nm, 800nm, 900nm, 1000nm, 1100nm, 1200nm, 1300nm, 1400nm or 1500nm.

[0044] In some embodiments, the diameter of the nanoscale structure II of the biomass substrate or the cationized biomass substrate is 50 nm to 800 nm or 200 nm to 600 nm, for example, at least one of 100 nm, 200 nm, 300 nm, 400 nm, 500 nm or 600 nm.

[0045] In some embodiments, the aspect ratio of the nanoscale structure II of the biomass substrate or cationized biomass substrate is 1:1 to 1:150, preferably the aspect ratio of the nanoscale structure is 1:1 to 1:100, more preferably the aspect ratio of the nanoscale structure is 1:10 to 1:100, for example 1:50.

[0046] In some embodiments, the micron-scale structure I of the biomass substrate or the cationized biomass substrate includes at least one of micron sheets, micron fibers, and micron multi-level structures.

[0047] In some embodiments, the micron-scale structure I of the biomass substrate or the cationized biomass substrate is fibrous or film-like, which can also be called fiberization.

[0048] In some embodiments, the micron-scale structure I of the biomass substrate or the cationized biomass substrate is in the shape of villi, tentacles, whiskers or other irregular structures.

[0049] In some embodiments, the nanoscale structure II of the biomass substrate or the cationized biomass substrate is distributed on the surface and / or edge of the structure I. Specifically, the structure II is densely distributed on the surface and / or edge of the structure I.

[0050] In some embodiments, the nanoscale structure II of the biomass substrate or the cationized biomass substrate is distributed on the microscale structure I to form floccules as a whole.

[0051] In some embodiments, the nanoscale structure II of the biomass substrate or the cationized biomass substrate is distributed on the microscale structure I to form an overall structure similar to a porous sponge.

[0052] In some embodiments, the nanoscale structure II and the microscale structure I of the biomass substrate or the cationized biomass substrate together form a feather-like structure.

[0053] In some embodiments, the nanoscale structure II and the microscale structure I of the biomass substrate or the cationized biomass substrate together form a dendritic structure.

[0054] In some embodiments, the biomass substrate or the cationized biomass substrate is in the form of fibers, sheets, feathers, dendrites, flocs, or porous sponges.

[0055] The method for preparing the biomass substrate or the cationized biomass substrate of the present invention may include the following steps:

[0056] dissolving the biomass or its cationized product in a solvent to form a biomass solution;

[0057] The biomass solution and the coagulation bath are added to a crushing device, and the two are mechanically crushed while being mixed to prepare the bio-based substrate; or after the mechanical crushing, the biomass substrate is filtered and washed to prepare the biomass substrate. A typical electron microscope diagram of the obtained biomass substrate is shown in Figure 1 shown.

[0058] In some embodiments, the solvent for dissolving the biomass can be selected from any good solvent known in the art that can completely dissolve the biomass. Preferably, according to the type of cellulose or cellulose-containing raw materials, the selected solvent can be selected from one or more of the following systems: organic solvents, ionic liquids, mixed solvents of ionic liquids and organic solvents, choline-type ionic liquid deep eutectic solvent systems, organic solvent / salt systems, amine oxide systems (NMMO), carbamate systems, alkali / water systems, alkali / urea systems, alkali / thiourea systems, liquid ammonia / NH4SCN, organic acids, aqueous metal salt solutions, alcohol solutions of metal salt hydrates, water-alcohol mixed solutions of metal salt hydrates, and other solvent systems.

[0059] In some embodiments, the reagent used in the washing step is selected from at least one of water, alcohol, alcohol-water mixture, HCl aqueous solution, NaOH aqueous solution, and inorganic salt aqueous solution, preferably water and / or alcohol, such as water; the coagulation bath is selected from at least one of water, alcohol, alcohol-water mixture, HCl aqueous solution, NaOH aqueous solution, and inorganic salt aqueous solution, preferably water and / or alcohol, such as water.

[0060] In some embodiments, component A is an aqueous solution of 0.1-10% or 1-5% biomass substrate in an aqueous solvent.

[0061] For example, the biomass substrate can be obtained by the preparation method described in Chinese Patent Application No. 202310481795.1.

[0062] The preparation method of the cationic biomass substrate includes: adding an alkaline aqueous solution, such as NaOH or KOH aqueous solution, to a biomass solution, stirring and dissolving to obtain a biomass alkali solution, adding an alcohol organic solvent to the biomass alkali solution to dissolve, adding a cationic etherifying agent to carry out a grafting reaction, and washing with deionized water to neutrality, thereby obtaining a cationic biomass substrate.

[0063] In some embodiments, the concentration of the alkaline aqueous solution is 0.1% to 3%.

[0064] In some embodiments, the mass concentration of the biomass substrate in the alkaline solution is 2% to 10%.

[0065] In some embodiments, the cationic etherifying agent is selected from organic amine salts containing halogenated hydrocarbon groups or epoxy groups, for example, one or more of glycidyltrimethylammonium chloride and 3-chloro-2-hydroxypropyltrimethylammonium chloride.

[0066] In some embodiments, the organic solvent may be one or a composite solvent of methanol, ethanol or isopropanol.

[0067] In some embodiments, the weight ratio of the cationic etherifying agent to the biomass substrate is 1:(0.8-1.2), for example 1:1.

[0068] In some embodiments, the reaction temperature is 25-70°C, such as 25°C, 30°C, 40°C, 50°C or 60°C.

[0069] In some embodiments, the reaction time is 2 to 48 hours, such as 4 to 24 hours.

[0070] In some embodiments, the reaction is carried out under stirring conditions.

[0071] Component B

[0072] In some embodiments, the content of PHA, AKD, PGA, PLA, PBAT, cellulose ester or cellulose ether in component B in the biomass material additive is 0.01-5%, 0.1-3% or 0.5-2%, for example, it can be 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4% or 1.5%, etc.

[0073] In some embodiments, Component B is PHA and / or AKD.

[0074] In some embodiments, component B is an emulsion of 5-30% or 15-25% PHA and / or AKD in an aqueous solvent.

[0075] In some embodiments, the biomass material of the present invention may further include component C. Component C is selected from a retention agent (such as polyacrylamide), an anion scavenger, etc., and its content in the biomass material does not exceed 5%, preferably does not exceed 1%.

[0076] The aqueous solvent of the present invention refers to water alone, or a mixed solvent consisting of water and an organic solvent, wherein the content of the organic solvent in the solvent (water and organic solvent) does not exceed 20wt%, for example, does not exceed 15wt%, 10wt%, 5wt%, 3wt%, 1wt%. The organic solvent is preferably a water-soluble organic solvent, and illustratively, the organic solvent includes, for example, but is not limited to, ethanol, acetone, dimethyl sulfoxide, and other water-miscible solvents.

[0077] For example, the biomass material additive of the present invention may include: component A, 1-5% of an aqueous liquid of a biomass substrate in an aqueous solvent; and 15-25% of an emulsion of PHA and / or AKD in an aqueous solvent.

[0078] In some embodiments, the amount of the biomass material in the modified pulp relative to 100 parts of pulp is 0.5-20 parts, 1-10 parts or 2-5 parts, for example, it can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0079] ②Other additives

[0080] In some embodiments, the modified slurry of the present invention also includes other additives, and the other additives are selected from at least one of the following: water and / or oil resistance agents, wet strength agents, dry strength agents, coagulants, sizing agents, pigments and / or dyes, preservatives or dispersants.

[0081] In some embodiments, other additives of the present invention may include wet strength agents or coagulants, etc.

[0082] In order to avoid problems such as complicated process and low efficiency caused by clogging of die holes, the modified slurry of the present invention preferably does not include wet strength agent, sizing agent and / or mineral filler.

[0083] In some embodiments, the content of other additives of the present invention in the modified slurry is 0-15%, for example, it can be 0.01%, 0.1%, 1%, 2%, 3%, 5%, 7%, 10% or 12%, etc.

[0084] II Paper Plastic Products

[0085] Any of the aforementioned modified pulps of the present invention is particularly suitable for preparing paper plastic products.

[0086] In some specific embodiments, the paper plastic product is prepared by the following method:

[0087] (1) Soak the pulp board in water to fully swell it, and use a disintegrator to disintegrate it. After the fibers can be completely dispersed in the water, drain the water and prepare the pulp into a certain concentration according to the plan for use.

[0088] (2) Take a certain amount of pulp, add a modifier or other pulp, fully stir and disperse it in water to obtain modified pulp.

[0089] (3) Pour the pulp obtained in (2) into a molder to make a mold paper blank.

[0090] (4) Drying the wet mold in (3) by vacuum hot pressing to finally obtain a pulp molded product.

[0091] III Application

[0092] The pulp molding product of the present invention can be applied to the pulp molding industry, such as digital 3C paper molding, daily chemical paper molding, medical paper molding, tobacco paper molding, wine packaging paper molding, tableware packaging paper molding, dry pressed paper molding, etc.

[0093] Example

[0094] raw material

[0095] Bamboo pulp chemical pulp: purchased from Sichuan Huanlong New Materials Co., Ltd.

[0096] Bamboo pulp chemical mechanical pulp: purchased from Sichuan Huanlong New Materials Co., Ltd.

[0097] Bamboo bleached chemical pulp: purchased from Sichuan Yongfeng Paper Co., Ltd.

[0098] Bleached chemical pulp of sugarcane pulp was purchased from Sichuan Yongfeng Paper Co., Ltd.

[0099] Biomass materials: Homemade.

[0100] Wet strength agent: purchased from Zhejiang Chuanhua Huayang Chemical Co., Ltd., model SWS-200.

[0101] PAC: polyaluminium chloride, purchased from Tianjin Dingshengxin Chemical Co., Ltd., analytical grade.

[0102] Test Method

[0103] Ring pressure performance: GB / T 2679.8-2016.

[0104] Tearing properties: GB / T 455-2002.

[0105] Burst strength: GB / T 1539-2007.

[0106] Tensile strength: GB / T 12914-2008.

[0107] Synthesis Example 1-2 Preparation of biomass materials

[0108] Synthesis Example 1 Preparation of biomass material A-1 with a size of 164.54 μm

[0109] A-1 includes:

[0110] Component A is 100 parts, which is a biomass material with a dendritic structure with a mass fraction of 2 wt%;

[0111] Component B is 5 parts, which is AKD emulsion with a mass fraction of 19 wt%.

[0112] Specific preparation method:

[0113] Preparation method of biomass substrate:

[0114] 4 g of dried bacca pulp cellulose was added to a three-necked flask, and 96 g of 1-allyl-3-methylimidazolium chloride ionic liquid ([AMIM][Cl]) was added. The cellulose solution was obtained after stirring at 80°C for 2 h. The cellulose solution and ethanol were added to a cone rotor colloid mill at a volume ratio of 1:120 and ground. After grinding for 30 minutes, a broken gel was obtained. After filtration, it was repeatedly washed with water until no precipitation was produced when AgNO3 was added to the filtrate. The filtered gel was re-dispersed with water. The volume average size of the biomass-based material (micro-nano cellulose) in the dispersion was 164.54 μm, with a dendritic morphology, namely biomass material A-1, as measured by a laser particle size analyzer.

[0115] Place the suspension of component A in a container, add component B into A, stir while adding, continue stirring at room temperature, and after it is fully mixed, take it out for use.

[0116] Synthesis Example 2 Preparation of biomass material A-2 with a size of 277.73 μm

[0117] 6 g of dried bacca pulp cellulose was added to a three-necked flask, and 94 g of 1-ethyl-3-methylimidazolium acetate ionic liquid ([EMIM][Ac]) was added. After stirring at 100°C for 2 h, a cellulose solution was obtained. The cellulose solution and deionized water were added to a toothed rotor type colloid mill at a volume ratio of 1:10 and ground. After grinding for 30 minutes, a broken gel was obtained. After suction filtration, it was repeatedly washed with water until no precipitation was produced when AgNO3 was added to the filtrate. The filtered gel was re-dispersed with water. The volume average size of the biomass-based material (micro-nano cellulose) in the dispersion was 277.73 μm, which had a dendritic morphology, namely biomass material A-2, as measured by a laser particle size analyzer.

[0118] Examples 1-4

[0119] The natural bamboo pulp board (chemical pulp or chemical mechanical pulp) is fully swollen and dissociated in water, and the completely dissociated fibers are collected and adjusted to a certain concentration of pulp for standby use. According to the formula in Table 1, a corresponding amount of additives is added to the pulp, and after fully stirring and mixing, a paper-molding mold sample is prepared using a molder and a vacuum hot press dryer. The samples of each embodiment are placed indoors for a period of time to balance the moisture and then the corresponding indexes are tested. The results are shown in Table 1.

[0120] Table 1

[0121]

[0122] The paper-molded mold samples of Examples 3 and 4 were subjected to a wear resistance test. The test instrument was an abrasion tester, and the test parameters were: 2 lb weight, 42 times / minute, set the friction number to 120 times, and rubbed with A4 paper. The results are shown in Figure 2. Figure 2 shown.

[0123] Embodiment 5-8

[0124] The natural bamboo pulp board (bleached bamboo pulp or bleached sugarcane pulp) is fully swollen and dissociated in water, and the completely dissociated fibers are collected and prepared into a certain concentration of pulp according to Table 2 for standby use. According to the formula in Table 2, a corresponding amount of additives is added to the pulp, and after fully stirring and mixing, a paper-molding mold sample is prepared using a molder and a vacuum hot press dryer. During drying, a layer of copper mesh is placed in the mold, and the sample thickness is slightly larger and the tightness is slightly lower. The samples of each embodiment are placed indoors for a period of time to balance the moisture and then the corresponding index tests are carried out. The results are shown in Table 2.

[0125] Table 2

[0126]

[0127] Examples 9-11

[0128] The natural bamboo pulp board (bleached bamboo pulp and bleached sugarcane pulp) is fully swollen and dissociated in water, and the completely disintegrated fibers are collected and mixed into bamboo and sugarcane mixed pulp according to a ratio of 7:3 for standby use. According to the formula in Table 3, biomass materials of different sizes are added to the pulp, and after being fully stirred and mixed, paper-molding mold samples are prepared using a molder and a vacuum hot press dryer. During drying, two layers of copper mesh + one layer of cardboard are placed in the mold, and the sample thickness is slightly smaller and the tightness is slightly higher. The samples of each embodiment are placed indoors for a period of time to balance the moisture and then the corresponding index tests are carried out. The results are shown in Table 3.

[0129] Table 3

[0130]

[0131] It can be seen that the biomass materials of different specifications of the present invention have a good performance improvement effect on various types and sizes of pulp, and can improve the mechanical properties and wear resistance of the pulp composition. In particular, as can be seen from Table 1, the biomass materials of the present invention significantly improve the performance of chemical-mechanical pulp with a high impurity content, thereby improving the application value of the chemical-mechanical pulp with poor quality.

[0132] In the above embodiments, all technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A modified slurry, comprising: (i) 100 parts of paper pulp; and, (ii) 0.01-20 parts of additives; The additive includes at least one biomass material, the biomass material includes component A, and the component A is selected from one or both of a biomass substrate or a cationic biomass substrate; the biomass substrate and the cationic biomass substrate both have a dendritic, fibrous, flaky, feathery, flocculent or porous sponge-like structure.

2. According to the modified pulp according to claim 1, the pulp is selected from at least one of wood pulp, bamboo pulp, reed pulp, sugarcane pulp, chemical pulp, chemimechanical pulp, mechanical pulp or waste paper pulp, preferably at least one of chemimechanical pulp or bamboo-sugarcane mixed pulp.

3. The modified pulp according to claim 1, wherein the biomass in the biomass substrate or the cationized biomass substrate is selected from at least one of cellulose, purified cotton, absorbent cotton or wood pulp. 4 . The modified pulp according to claim 1 , wherein the volume average size of the biomass substrate or the cationized biomass substrate is 100-500 μm, preferably 150-350 μm.

5. The modified pulp according to any one of claim 1, wherein the amount of the biomass material is 1-10 parts, preferably 2-5 parts, relative to 100 parts of pulp.

6. According to the modified pulp according to any one of claims 1 to 5, the biomass material further comprises component B, and the component B is selected from at least one of polyhydroxyalkanoate (PHA), alkyl ketene dimer (AKD), polyglycolic acid (PGA), polylactic acid (PLA), polybutylene terephthalate-adipate (PBAT), cellulose ester or cellulose ether, and preferably component B is selected from PHA and / or AKD.

7. The modified slurry according to claim 6, wherein the additives further include other additives, and the other additives are selected from at least one of the following: water-resistant and / or oil-resistant agents, wet strength agents, dry strength agents, coagulants, sizing agents, pigments and / or dyes, preservatives or dispersants.

8. The modified slurry according to claim 1, wherein the additive does not contain a wet strength agent, a sizing agent and / or a mineral filler.

9. A paper-plastic product comprising the modified pulp according to any one of claims 1 to 8.

10. A paper-plastic product made from the modified pulp according to any one of claims 1 to 8.

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