Preparation process of paper wood material and its application

Abstract

The invention discloses a preparation process and application of a paper-wood material. The invention uses glycerol and citric acid as raw materials, introduces phosphorus-containing compounds to prepare bio-based phosphorus-containing polyester; adds the bio-based phosphorus-containing polyester into a melamine / dialdehyde starch resin system to prepare an environmentally friendly resin, and applies the environmentally friendly resin to the paper-wood material processing technology, which can effectively solve the problem of moisture-proof and water-resistant performance of the paper-wood material, and also can give the paper-wood material good flame retardant performance (smoke suppression performance).

Description

Technical Field

[0001] The invention relates to the technical field of wood processing, and in particular to a preparation process of a paper-wood material and application thereof. Background Art

[0002] OSB board, also known as oriented strand board, is a structural board made of oriented wood chips and adhesives formed under high temperature and high pressure. OSB board is an economical and practical building material, widely used in house construction, furniture manufacturing, decoration and other fields.

[0003] Compared with traditional particleboard, OSB board has higher strength, stability and durability. During the production process of OSB board, the wood chips are arranged in a directional manner, which improves the strength and stability of the board. At the same time, the use of glue in OSB board is more environmentally friendly, which meets the requirements of modern society for environmentally friendly materials.

[0004] Recycling of waste paper is a very environmentally friendly and sustainable way of utilizing resources. By recycling waste paper, the exploitation and utilization of natural resources such as wood can be reduced, environmental pollution and pressure can be alleviated, and energy can be saved and carbon emissions can be reduced. Therefore, the present invention is committed to applying waste paper in the preparation process of oriented strand board.

[0005] CN110922550A discloses a method for preparing a melamine resin with low free formaldehyde content, wherein the target resin is prepared by addition and polycondensation reaction of melamine and dialdehyde starch under the action of an alkaline catalyst. The resin has the characteristics of low free formaldehyde content, high bonding strength, good storage stability, etc., and can solve the problems of excessively high free formaldehyde content in traditional melamine resins; however, the problem of poor moisture and water resistance still exists. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a preparation process for paper-wood materials: bio-based phosphorus-containing polyester is prepared by using glycerol and citric acid as raw materials and introducing phosphorus-containing compounds; the bio-based phosphorus-containing polyester is added to a melamine / diadehyde starch resin system to prepare an environmentally friendly resin and applied to the paper-wood material processing technology, which can effectively solve the problem of moisture-proof and water-resistant performance of paper-wood materials, and at the same time can also give paper-wood materials good flame retardant properties (smoke suppression properties).

[0007] A process for preparing a paper-wood material comprises the following steps:

[0008] S1 peels the felled pine wood and then planes the wood into thin slices; selects the thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely, the pine wood thin slices;

[0009] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0010] S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 3-8%;

[0011] S4 stirs and mixes the pine wood flakes, the waste paper flakes and the environmentally friendly resin to obtain the glue-coated pine wood flakes and the glue-coated waste paper flakes;

[0012] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150-200 mm, and then pre-press them into a top layer of 9-18 mm; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150-200 mm, and pre-press them into a core layer of 9-18 mm;

[0013] S6 places the bottom layer, core layer and top layer in order and presses them. The pressing temperature is 120℃-180℃, the hot pressing pressure is 1.0-2.3MPa and the pressing time is 3-8 minutes.

[0014] Cool to room temperature;

[0015] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material.

[0016] Preferably, the mass ratio of the pine wood flakes, the waste paper flakes and the environmentally friendly resin is 70-90:10-30:8-15.

[0017] The preparation method of the environmentally friendly resin comprises the following steps: evenly mixing dialdehyde starch and water, adjusting the pH to 9.0-10.0 at 70-90° C.; adding boric acid, bio-based phosphorus-containing polyester and melamine, and keeping the mixture at 70-90° C. for 2-4 hours to obtain the environmentally friendly resin.

[0018] Further preferably, the preparation method of the environmentally friendly resin is: 690g of dialdehyde starch and 1000g of water are mixed evenly, the temperature is raised to 70-90°C, and the pH is adjusted to 9.0-10.0 with a 30-50wt% NaOH aqueous solution; 5-15g of boric acid, 10-30g of bio-based phosphorus-containing polyester, and 100-250g of melamine are added, and the mixture is kept warm at 70-90°C for 2-4h to obtain the environmentally friendly resin.

[0019] The preparation method of the bio-based phosphorus-containing polyester is as follows: glycerol and a phosphorus-containing compound are uniformly mixed and reacted at 70-90° C. for 6-10 hours; phosphorylated glycerol is obtained by filtering; phosphorylated glycerol, citric acid and water are uniformly stirred at 45-60° C. and then air-dried at 105-120° C. for 10-20 hours; vacuum-dried at 110-130° C. for 8-16 hours, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0020] Preferably, the preparation method of the bio-based phosphorus-containing polyester is as follows: 138-322g of glycerol and 142g of a phosphorus-containing compound are mixed evenly, and the mixture is reacted at 70-90°C for 6-10h; phosphorylated glycerol is obtained by filtering; 100g of phosphorylated glycerol, 80-150g of citric acid and 100mL of water are stirred evenly at 45-60°C, and the mixture is dried by forced air at 105-120°C for 10-20h; and the mixture is then vacuum dried at 110-130°C for 8-16h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0021] Preferably, the phosphorus-containing compound is phosphorus pentoxide or dimethyl phosphate.

[0022] The invention also discloses a paper-wood material, which is prepared by the above-mentioned preparation process.

[0023] Common raw materials for wooden boxes for transport packaging include pine, birch, plywood, and fiberboard. Pine is light, soft, and elastic, but has a low density, is not hard enough, and cannot weigh large goods. Birch is hard, has a high density, has good strength and stability, but is expensive and has high costs. Oriented strand board has high strength and can carry large goods. It uses environmentally friendly resins and can effectively reduce the release of formaldehyde.

[0024] The invention also discloses the application of the paper-wood material in a transport packaging box. Specifically, the paper-wood material of the invention can be cut and customized according to the size and weight of the goods, and assembled into a stable frame, which can be moisture-proof and water-resistant for a long time for sea transportation, and will not deform, so as to protect the goods from damage.

[0025] Beneficial effects of the present invention:

[0026] Melamine / dialdehyde starch resin is obtained by curing melamine dialdehyde starch small molecule oligomers; however, since there are more hydroxyl groups remaining in the resin, it can react with water in the air, so that the resin produces different degrees of hygroscopicity in different environments. With the change of environmental humidity, the resin material is easy to crack and form cracks; when applied to oriented strand board, it is easy to cause water absorption and deformation, and cannot effectively protect the goods. Compared with the prior art, the present invention uses glycerol and citric acid as raw materials and introduces phosphorus-containing compounds to prepare bio-based phosphorus-containing polyester; when added to the melamine / dialdehyde starch resin system, it can effectively solve the problem of poor water resistance and moisture resistance of melamine / dialdehyde starch resin. The present invention introduces a specific bio-based phosphorus-containing polyester, which has a relatively stable chemical structure and chemical inertness, can effectively block the penetration of moisture and gas, and improve the moisture-proof performance of environmentally friendly resins. Furthermore, the specific bio-based phosphorus-containing polyester introduced in the present invention can also improve the flame retardant performance, and can be effectively suppressed by the application of the paper and wood material of the present invention. The amount of smoke generated by combustion. DETAILED DESCRIPTION

[0027] The sources and parameters of some raw materials in the examples of the present invention are as follows:

[0028] Dialdehyde starch, also known as dialdehyde starch and oxidized starch, has the following structural formula:

[0029]

[0030] Example 1

[0031] A process for preparing a paper-wood material comprises the following steps:

[0032] S1 peels the felled pine wood, and then uses a flaker to plane the wood into thin slices; selects thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely pine wood thin slices;

[0033] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0034] S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 5%;

[0035] S4: 80 parts by weight of pine flakes, 20 parts by weight of waste paper flakes, and 10 parts by weight of environmentally friendly resin are put into a drum mixer according to a mass ratio and stirred and mixed evenly to obtain glue-coated pine flakes and glue-coated waste paper flakes;

[0036] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150 mm, and then pre-press them into a 10 mm top layer; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150 mm, and pre-press them into a 10 mm core layer;

[0037] S6. Place the bottom layer, the core layer, and the top layer in a hot press in order for pressing at a temperature of 150° C., a hot pressing pressure of 1.3 MPa, and a pressing time of 7 minutes, and cool to room temperature;

[0038] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material; the thickness of the paper-wood material is 18 mm.

[0039] The preparation method of the environmentally friendly resin is as follows: 690g of dialdehyde starch and 1000g of water are mixed evenly, the mixture is heated to 80°C, and the pH value is adjusted to 9.5 with a 40wt% NaOH aqueous solution; 10g of boric acid, 20g of bio-based phosphorus-containing polyester, and 190g of melamine are added, and the mixture is kept warm at 80°C for 2.5h to obtain the environmentally friendly resin.

[0040] The preparation method of the bio-based phosphorus-containing polyester is as follows: 276g of glycerol and 142g of phosphorus pentoxide are mixed evenly, and then reacted at 80°C for 8h; phosphorylated glycerol is obtained by filtering; 100g of phosphorylated glycerol, 110g of citric acid, and 100mL of water are stirred evenly at 50°C, and then kept warm at 120°C for 15h, and then kept warm in a vacuum drying oven at 130°C for 11h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0041] Example 2

[0042] A process for preparing a paper-wood material comprises the following steps:

[0043] S1 peels the felled pine wood, and then uses a flaker to plane the wood into thin slices; selects thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely pine wood thin slices;

[0044] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0045] S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 5%;

[0046] S4: 80 parts by weight of pine flakes, 20 parts by weight of waste paper flakes, and 10 parts by weight of environmentally friendly resin are put into a drum mixer according to a mass ratio and stirred and mixed evenly to obtain glue-coated pine flakes and glue-coated waste paper flakes;

[0047] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150 mm, and then pre-press them into a 10 mm top layer; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150 mm, and pre-press them into a 10 mm core layer;

[0048] S6. Place the bottom layer, the core layer, and the top layer in a hot press in order for pressing at a temperature of 150° C., a hot pressing pressure of 1.3 MPa, and a pressing time of 7 minutes, and cool to room temperature;

[0049] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material; the thickness of the paper-wood material is 18 mm.

[0050] The preparation method of the environmentally friendly resin is as follows: 690g of dialdehyde starch and 1000g of water are mixed evenly, the mixture is heated to 80°C, and the pH value is adjusted to 9.5 with a 40wt% NaOH aqueous solution; 10g of boric acid, 20g of bio-based phosphorus-containing polyester, and 190g of melamine are added, and the mixture is kept warm at 80°C for 2.5h to obtain the environmentally friendly resin.

[0051] The preparation method of the bio-based phosphorus-containing polyester is as follows: 276g of glycerol and 142g of dimethyl phosphate are mixed evenly, and then reacted at 80°C for 8h; phosphorylated glycerol is obtained by filtering; 100g of phosphorylated glycerol, 110g of citric acid, and 100mL of water are stirred evenly at 50°C, and then kept warm at 120°C for 15h, and then kept warm in a vacuum drying oven at 130°C for 11h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0052] Example 3

[0053] A process for preparing a paper-wood material comprises the following steps:

[0054] S1 peels the felled pine wood, and then uses a flaker to plane the wood into thin slices; selects thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely pine wood thin slices;

[0055] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0056] S3 dries the pinewood flakes and the waste paper flakes to reduce their moisture content to 6%;

[0057] S4: 70 parts by weight of pine flakes, 30 parts by weight of waste paper flakes, and 8 parts by weight of environmentally friendly resin are put into a drum mixer according to a mass ratio and stirred and mixed evenly to obtain glue-coated pine flakes and glue-coated waste paper flakes;

[0058] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150 mm, and then pre-press them into a 10 mm top layer; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150 mm, and pre-press them into a 10 mm core layer;

[0059] S6. Place the bottom layer, the core layer, and the top layer in a hot press in order for pressing at a temperature of 120° C., a hot pressing pressure of 2.3 MPa, and a pressing time of 3 minutes, and cool to room temperature;

[0060] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material; the thickness of the paper-wood material is 18 mm.

[0061] The preparation method of the environmentally friendly resin is as follows: 690g of dialdehyde starch and 1000g of water are mixed evenly, the mixture is heated to 70°C, and the pH value is adjusted to 9.0 with a 30wt% NaOH aqueous solution; 5g of boric acid, 10g of bio-based phosphorus-containing polyester, and 100g of melamine are added, and the mixture is kept warm at 70°C for 4h to obtain the environmentally friendly resin.

[0062] The preparation method of the bio-based phosphorus-containing polyester is as follows: 138g of glycerol and 142g of dimethyl phosphate are mixed evenly, and then reacted at 70°C for 6h; phosphorylated glycerol is obtained by filtering; 100g of phosphorylated glycerol, 80g of citric acid, and 100mL of water are stirred evenly at 45°C, and then kept warm at 105°C in a blower dryer for 20h, and then kept warm in a vacuum drying oven at 110°C for 8h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0063] Example 4

[0064] A process for preparing a paper-wood material comprises the following steps:

[0065] S1 peels the felled pine wood, and then uses a flaker to plane the wood into thin slices; selects thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely pine wood thin slices;

[0066] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0067] S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 8%;

[0068] S4: 90 parts by weight of pine flakes, 10 parts by weight of waste paper flakes, and 15 parts by weight of environmentally friendly resin are put into a drum mixer according to a mass ratio and stirred and mixed evenly to obtain glue-coated pine flakes and glue-coated waste paper flakes;

[0069] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150 mm, and then pre-press them into a 10 mm top layer; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150 mm, and pre-press them into a 10 mm core layer;

[0070] S6. Place the bottom layer, the core layer, and the top layer in a hot press in order for pressing at a temperature of 180° C., a hot pressing pressure of 1.0 MPa, and a pressing time of 8 minutes, and cool to room temperature;

[0071] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material; the thickness of the paper-wood material is 18 mm.

[0072] The preparation method of the environmentally friendly resin is as follows: 690g of dialdehyde starch and 1000g of water are mixed evenly, the mixture is heated to 90°C, and the pH value is adjusted to 9.5 with a 50wt% NaOH aqueous solution; 15g of boric acid, 3g of bio-based phosphorus-containing polyester, and 250g of melamine are added, and the mixture is kept warm at 90°C for 2.0h to obtain the environmentally friendly resin.

[0073] The preparation method of the bio-based phosphorus-containing polyester is as follows: 322g of glycerol and 142g of dimethyl phosphate are mixed evenly, and then reacted at 90°C for 6h; phosphorylated glycerol is obtained by filtering; 100g of phosphorylated glycerol, 150g of citric acid, and 100mL of water are stirred evenly at 60°C, and then kept warm at 120°C for 10h, and then kept warm in a vacuum drying oven at 120°C for 8h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester.

[0074] Comparative Example 1

[0075] A process for preparing a paper-wood material comprises the following steps:

[0076] S1 peels the felled pine wood, and then uses a flaker to plane the wood into thin slices; selects thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely pine wood thin slices;

[0077] S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets;

[0078] S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 5%;

[0079] S4: 80 parts by weight of pine flakes, 20 parts by weight of waste paper flakes, and 10 parts by weight of environmentally friendly resin are put into a drum mixer according to a mass ratio and stirred and mixed evenly to obtain glue-coated pine flakes and glue-coated waste paper flakes;

[0080] S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150 mm, and then pre-press them into a 10 mm top layer; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150 mm, and pre-press them into a 9-18 mm core layer;

[0081] S6. Place the bottom layer, the core layer, and the top layer in a hot press in order for pressing at a temperature of 150° C., a hot pressing pressure of 1.3 MPa, and a pressing time of 7 minutes, and cool to room temperature;

[0082] S7 trims, cuts, and naturally cools the pressed board to obtain the paper-wood material; the thickness of the paper-wood material is 18 mm.

[0083] The preparation method of the environmentally friendly resin is as follows: 690g of dialdehyde starch and 1000g of water are mixed evenly, the mixture is heated to 80°C, and the pH value is adjusted to 9.5 with a 40wt% NaOH aqueous solution; 10g of boric acid and 190g of melamine are added, and the mixture is kept warm at 80°C for 2.5h to obtain the environmentally friendly resin.

[0084] Test Example 1

[0085] The mechanical properties and water resistance of the obtained paper-wood material were tested with reference to "GB / T 4897-2015 Particleboard".

[0086] The smoke generation performance of the paper-wood material was tested using a cone calorimeter (Modis, model CCT). The paper-wood material was cut into 10×10×1.2 cm 3 The plate, at 35kW / m 2 The combustion experiment was carried out at a heat output of 88.36 cm 2 , 25 mm from the heater, and the experiment lasted 1200 s.

[0087] Table 1

[0088]

[0089] Note: Oxygen index <22% is flammable material, oxygen index between 22-27% is combustible material, oxygen index >27% is flame retardant material.

[0090] As can be seen from Table 1, the water resistance of the paper-wood material prepared in Examples 1-2 of the present invention fully meets the various indicators of the heavy-duty particleboard used in the dry state of the P4 type particleboard in GB / T4897-2015. In addition, the water resistance and flame retardancy of the paper-wood material prepared in Examples 1-2 of the present invention are significantly better than those of the paper-wood material in Comparative Example 1. The present invention uses glycerol and citric acid as raw materials and introduces phosphorus-containing compounds to prepare bio-based phosphorus-containing polyester; when added to the melamine / diadehyde starch resin system, it can effectively solve the problem of poor water resistance and moisture resistance of the melamine / diadehyde starch resin. The present invention introduces a specific bio-based phosphorus-containing polyester, which has a relatively stable chemical structure and chemical inertness, can effectively block the penetration of moisture and gas, and improve the moisture-proof performance of the environmentally friendly resin. Furthermore, the specific bio-based phosphorus-containing polyester introduced in the present invention can also improve the flame retardancy, and can be effectively suppressed by the application in the paper-wood material of the present invention. The amount of smoke generated by combustion.

Claims

1. A process for preparing paper wood material, characterized in that: The steps include: S1 peels the felled pine wood and then planes the wood into thin slices; selects the thin slices with a thickness of 0.2mm-0.8mm, a length of 50-80mm, and a width of 5mm-20mm, namely, the pine wood thin slices; S2 cuts the waste paper with a thickness of 0.2 mm to 0.8 mm into thin sheets with a length of 50 mm to 80 mm and a width of 5 mm to 20 mm, i.e., waste paper sheets; S3 dries the pinewood flakes and waste paper flakes to reduce their moisture content to 3-8%; S4 stirs and mixes the pine wood flakes, the waste paper flakes and the environmentally friendly resin to obtain glue-coated pine wood flakes and glue-coated waste paper flakes; S5: Arrange the glued pine wood slices and the glued waste paper slices in a longitudinal paving manner to a thickness of 150-200 mm, and then pre-press them into a top layer of 9-18 mm; the preparation method of the top layer is the same as that of the top layer; arrange the glued pine wood slices and the glued waste paper slices in a transverse paving manner to a thickness of 150-200 mm, and pre-press them into a core layer of 9-18 mm; S6. Arrange the bottom layer, the core layer, and the top layer in order and press them at a temperature of 120°C-180°C, a hot pressing pressure of 1.0-2.3 MPa, and a pressing time of 3-8 minutes, and cool them to room temperature; S7 trimming, cutting, and naturally cooling the pressed board to obtain the paper-wood material; The mass ratio of the pinewood flakes, waste paper flakes and environmentally friendly resin is 70-90:10-30:8-15; The preparation method of the environmentally friendly resin is as follows: 690 g of dialdehyde starch and 1000 g of water are mixed evenly, and then the mixture is heated to 70-90° C., and the pH value is adjusted to 9.0-10.0 with a 30-50 wt% NaOH aqueous solution; 5-15 g of boric acid, 10-30 g of bio-based phosphorus-containing polyester, and 100-250 g of melamine are added, and the mixture is kept at 70-90° C. for 2-4 h to obtain the environmentally friendly resin; The preparation method of the bio-based phosphorus-containing polyester is as follows: 138-322 g of glycerol and 142 g of a phosphorus-containing compound are uniformly mixed and reacted at 70-90° C. for 6-10 h; phosphorylated glycerol is obtained by filtering; 100 g of phosphorylated glycerol, 80-150 g of citric acid and 100 mL of water are uniformly stirred at 45-60° C. and then air-dried at 105-120° C. for 10-20 h; then vacuum-dried at 110-130° C. for 8-16 h, naturally cooled to room temperature, and ground into powder to obtain the bio-based phosphorus-containing polyester; The phosphorus-containing compound is phosphorus pentoxide or dimethyl phosphate.

2. A paper-wood material, characterized in that: The method is prepared by the preparation process described in claim 1.

3. Use of the paper-wood material as claimed in claim 2 in preparing transport packaging boxes.

Images