CN108060737B - Preparation method of biomass-based combined wall - Google Patents
Preparation method of biomass-based combined wall Download PDFInfo
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- CN108060737B CN108060737B CN201710755934.XA CN201710755934A CN108060737B CN 108060737 B CN108060737 B CN 108060737B CN 201710755934 A CN201710755934 A CN 201710755934A CN 108060737 B CN108060737 B CN 108060737B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4081—Mixtures of compounds of group C08G18/64 with other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6492—Lignin containing materials; Wood resins; Wood tars; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
- C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
Abstract
The invention discloses a preparation method of a biomass-based combined wall, which comprises the following steps: preparing a hollow biomass-based thermoplastic wall profile, preparing a biomass-based polyurethane hard foam material, preparing a solid biomass-based wall profile and preparing a biomass-based combined wall. The method provided by the invention takes biomass as a raw material, takes lignin obtained after the biomass raw material is subjected to enzymolysis and fermentation separation as a raw material for producing the thermoplastic material, has good polymerization performance, and is mixed with PVC resin and a lubricant for thermoplastic extrusion, so that the obtained biomass-based thermoplastic material still has high tensile strength and has the characteristic of no water absorption. The lignin is used as a raw material and is converted into a biomass-based thermoplastic material and a biomass-based polyurethane rigid foam plastic with higher added values, so that the method has higher economic benefit.
Description
Technical Field
The invention relates to the field of architectural decoration industry, in particular to a preparation method of a biomass-based combined wall.
Background
With the development of modern industry and the explosion of world population, energy crisis, food crisis and environmental crisis are increasingly aggravated. The economy of the world at present depends on petroleum, coal and other stone resources excessively, the non-regenerability of the petroleum, coal and other stone resources leads to gradual exhaustion of the resources, the price is gradually increased in sections, and the combustion of the resources to generate a large amount of gases such as carbon dioxide, sulfur dioxide and other gases and suspended particulate matters causes the climate environment to be increasingly deteriorated. The search for renewable clean energy sources to replace them has become a focus of attention of scientific research departments in various countries. Among them, the biomass energy is the most potential energy material because of its advantages of wide source, low price, strong reproducibility, and recyclable carbon dioxide.
Ethanol is taken as renewable energy to be greatly valued, at present, grains such as sugarcane and grains are mainly used as raw materials for producing fuel ethanol, but the limitation of the raw materials for producing the fuel ethanol is determined by population expansion and grain shortage. Cellulosic ethanol is an important energy source derived from renewable biomass. Lignocellulose is the most abundant renewable resource on the earth, about 10000 million tons of plant cellulose are generated by photosynthesis every year, and in order to avoid competing with people for grains and fields with grains, the lignocellulose becomes the most potential raw material for producing cellulosic ethanol. At present, most areas rely on straws as fuel or directly burn the straws in the field, so that the environment is polluted, and the utilization rate of straw burning energy is low, so that the resource is seriously wasted. The method for producing the cellulosic ethanol by using the agricultural wastes as the raw materials has the characteristics of no acid-base steam explosion, mild enzyme hydrolysis process conditions, simple equipment, low energy consumption, environmental friendliness and the like. The biomass energy can be converted in a large amount, the energy crisis is relieved, the atmospheric pollution can be relieved, the ecological environment is improved, the agricultural sustainable development is promoted, and the agricultural industrialization and the virtuous ecological cycle are driven. The residual slag is enzymatic hydrolysis lignin which is a natural high molecular substance and can replace petrochemical products to produce target organic products in many fields.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a biomass-based combined wall, which comprises the following steps:
mixing 75-90 parts by mass of dry lignin, 5-20 parts by mass of PVC resin and 5 parts by mass of a lubricant, and then putting the mixture into a high-temperature double-screw thermoplastic extruder for thermoplastic extrusion, wherein a discharge port of the extruder is provided with a hollow wall section mould, so that a hollow biomass-based thermoplastic wall section can be obtained;
putting 40-50 parts by mass of polyethylene glycol 40040-50 parts, 20-25 parts by mass of glycerol, 25-40 parts by mass of lignin and 0.5-1 part by mass of concentrated sulfuric acid into a reaction kettle, stirring, heating the reaction kettle to 140-160 ℃, and carrying out normal pressure liquefaction at the temperature for 60-90 min to obtain a biomass-based polyol liquefaction product; adding sodium hydroxide which has the chemical equivalent reaction quantity with concentrated sulfuric acid in the system into a reaction kettle, dehydrating in vacuum under the condition that the vacuum degree of the reaction kettle is 0.09MPa until no condensate is generated, and cooling to normal temperature to obtain a biological polyol finished product; adding an auxiliary agent into the biological polyol finished product to obtain the combined biological polyol; mixing the composite biological polyol finished product and isocyanate at a high speed according to a proportion by a spraying or casting polyurethane foaming machine to obtain a biomass-based polyurethane rigid foam material;
the biomass-based rigid polyurethane foam material is sprayed or poured in the inner space of the hollow biomass-based thermoplastic wall profile by a polyurethane spraying or pouring foaming machine to form a solid biomass-based wall profile, and then the solid biomass-based composite wall is formed by auxiliary connecting members.
Preferably, in the preparation method of the biomass-based combined wall, the moisture content of the dried lignin is less than or equal to 5 percent, and the mesh number is more than or equal to 400 meshes.
Preferably, in the preparation method of the biomass-based combined wall, the extrusion conditions of the high-temperature twin-screw thermoplastic extruder are as follows: the temperature of the feeding port is 20-80 ℃, the temperature of the conveying section is 80-120 ℃, the temperature of the melting section is 130-160 ℃, the temperature of the shearing and compressing section is 160-180 ℃, and the temperature of the extrusion port is 130-150 ℃.
Preferably, in the preparation method of the biomass-based combined wall, the lubricant is semi-refined paraffin.
Preferably, in the preparation method of the biomass-based combined wall, the auxiliary agents are a flame retardant, a foaming agent and a foam stabilizer.
Preferably, in the preparation method of the biomass-based combined wall,
the temperature of the reaction kettle is raised to 140-160 ℃ through three stages, including:
in the first stage, the temperature is increased to 100-120 ℃, and the temperature is kept for 10-20 min;
in the second stage, heating to 120-140 ℃, and keeping for 10-20 min;
and in the third stage, heating to 140-160 ℃, and keeping for 60-90 min until liquefaction is finished.
Preferably, in the preparation method of the biomass-based combined wall, the foaming machine is a spraying or casting polyurethane foaming machine.
The invention has the following beneficial effects:
1) because the biomass-based polyurethane hard foam material is poured into the cavity of the wall profile, the wall thickness of the biomass-based thermoplastic wall profile can be greatly reduced, and the density of the biomass-based polyurethane hard foam material is only one tenth of that of the biomass-based thermoplastic material, so that the total weight of the biomass-based combined wall is reduced.
2) The biomass-based polyurethane hard foam material has lower heat conductivity coefficient than air or other fillers in the cavity of the common wall section, so that the biomass-based combined wall has excellent energy-saving, heat-insulating and sound-insulating effects.
3) The biomass-based polyurethane hard foam material is filled in the cavity of the whole wall profile to form a solid wall profile, and then the solid wall profile is combined by the auxiliary connecting member to form a compact whole, so that the biomass-based combined wall has the advantages of high strength, folding resistance, bending resistance, deformation resistance and the like.
4) The method provided by the invention takes biomass as a raw material, takes lignin obtained after the biomass raw material is subjected to enzymolysis and fermentation separation as a raw material for producing the thermoplastic material, has good polymerization performance, and is mixed with PVC resin, lubricant and the like for thermoplastic extrusion, so that the obtained biomass-based thermoplastic material still has high tensile strength and the characteristic of non-water absorption. The lignin is used as a raw material and is converted into a biomass-based thermoplastic material and a biomass-based polyurethane rigid foam plastic with higher added values, so that the method has higher economic benefit.
5) The invention uses a large amount of biomass-based raw materials, accords with the direction of guiding the resource utilization of agricultural wastes by national industrial policies, and belongs to environment-friendly industry.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a block diagram of a process for preparing a hollow biomass-based thermoplastic wall profile according to an embodiment of the method for preparing a biomass-based combined wall provided by the invention;
FIG. 2 is a block diagram of a process for preparing a biomass-based polyurethane rigid foam material according to an embodiment of the method for preparing a biomass-based combined wall provided by the invention;
fig. 3 is a flow chart of a method for preparing a solid biomass-based wall profile according to an embodiment of the method for preparing a biomass-based combined wall provided by the invention.
FIG. 4 is a block diagram of a process for preparing a biomass-based composite wall according to an embodiment of the method for preparing a biomass-based composite wall provided by the invention
Detailed Description
The invention will be further explained with reference to the drawings.
The invention provides a preparation method of a biomass-based combined wall, which comprises the following steps:
mixing 75-90 parts by mass of dry lignin, 5-20 parts by mass of PVC resin and 5 parts by mass of a lubricant, and then putting the mixture into a high-temperature double-screw thermoplastic extruder for thermoplastic extrusion, wherein a discharge port of the extruder is provided with a hollow wall section mould, so that a hollow biomass-based thermoplastic wall section can be obtained;
putting 40-50 parts by mass of polyethylene glycol 40040-50 parts, 20-25 parts by mass of glycerol, 25-40 parts by mass of lignin and 0.5-1 part by mass of concentrated sulfuric acid into a reaction kettle, stirring, heating the reaction kettle to 140-160 ℃, and carrying out normal pressure liquefaction at the temperature for 60-90 min to obtain a biomass-based polyol liquefaction product; adding sodium hydroxide which has the chemical equivalent reaction quantity with concentrated sulfuric acid in the system into a reaction kettle, dehydrating in vacuum under the condition that the vacuum degree of the reaction kettle is 0.09MPa until no condensate is generated, and cooling to normal temperature to obtain a biological polyol finished product; adding an auxiliary agent into the biological polyol finished product to obtain the combined biological polyol; mixing the composite biological polyol finished product and isocyanate at a high speed according to a proportion by a spraying or casting polyurethane foaming machine to obtain a biomass-based polyurethane rigid foam material;
the biomass-based rigid polyurethane foam material is sprayed or poured in the inner space of the hollow biomass-based thermoplastic wall profile by a polyurethane spraying or pouring foaming machine to form a solid biomass-based wall profile, and then the solid biomass-based composite wall is formed by auxiliary connecting members.
In the preparation method of the biomass-based combined wall, the moisture content of the dried lignin is less than or equal to 5 percent, and the mesh number is more than or equal to 400 meshes.
In the preparation method of the biomass-based combined wall, the extrusion conditions of the high-temperature double-screw thermoplastic extruder are as follows: the temperature of the feeding port is 20-80 ℃, the temperature of the conveying section is 80-120 ℃, the temperature of the melting section is 130-160 ℃, the temperature of the shearing and compressing section is 160-180 ℃, and the temperature of the extrusion port is 130-150 ℃.
In the preparation method of the biomass-based combined wall, the lubricant is semi-refined paraffin.
In the preparation method of the biomass-based combined wall, the auxiliary agents are a flame retardant, a foaming agent and a foam stabilizer.
In the preparation method of the biomass-based combined wall body,
the temperature of the reaction kettle is raised to 140-160 ℃ through three stages, including:
in the first stage, the temperature is increased to 100-120 ℃, and the temperature is kept for 10-20 min;
in the second stage, heating to 120-140 ℃, and keeping for 10-20 min;
and in the third stage, heating to 140-160 ℃, and keeping for 60-90 min until liquefaction is finished.
In the preparation method of the biomass-based combined wall, the foaming machine is a spraying or casting polyurethane foaming machine.
The invention provides a preparation method of a biomass-based combined wall, which comprises the following steps:
1) as shown in figure 1, performing enzymolysis and fermentation separation on a biomass raw material to obtain a slag material, wherein the main component of the slag material is lignin; drying and crushing the slag to obtain a lignin particle raw material; mixing the lignin particle raw material, PVC resin and a lubricating agent, and feeding the mixture into a double-screw extruder for thermoplastic extrusion to obtain the hollow wall section of the biomass-based thermoplastic material with the specific specification.
2) As shown in fig. 2, performing enzymolysis and fermentation separation on a biomass raw material to obtain a slag material, wherein the main component of the slag material is lignin; drying and crushing the slag to obtain a lignin particle raw material; the lignin particle raw material, polyethylene glycol 400 and glycerol are liquefied into biological polyol under the condition of taking a trace amount of concentrated sulfuric acid as a catalyst, the biological polyol and related auxiliary agents are mixed into combined biological polyol, and the combined biological polyol is reacted with isocyanate in a specific ratio to generate the biomass-based polyurethane hard foam material.
3) And as shown in fig. 3, pouring a biomass-based polyurethane hard foam material in the hollow cavity of the hollow biomass-based thermoplastic wall profile to finally obtain the biomass-based wall profile.
4) As shown in fig. 4, the biomass-based wall profile can have any length within a certain limit on the premise of fixed width and fixed thickness, and can be combined into a biomass-based combined wall through certain auxiliary components.
Firstly), biomass-based thermoplastic material process concrete steps and parameter description:
1. mixing lignin, PVC resin and lubricant
Mixing the crushed and dried lignin with PVC resin and a lubricating agent, feeding the mixture into a high-temperature double-screw thermoplastic extruder, and manufacturing thermoplastic profiles with different specifications through different dies.
The water content of the lignin is less than or equal to 5%, the mesh number is more than 400 meshes, and the lignin accounts for 75-90% of the raw material; the PVC resin accounts for 50-20% of the raw material; the lubricant accounts for 5 percent of the raw materials.
2. High temperature thermoplastic
The temperature of each zone before and after the double-screw extruder is 130-180 ℃.
3. Finished thermoplastic material
According to different target thermoplastic material requirements, the discharge part of the double-screw extruder is provided with a corresponding die, and the thermoplastic material with specified requirements can be obtained.
II) specific steps and parameter description of the biomass-based polyurethane rigid foam material process:
1) mixing the raw materials
Adding polyethylene glycol 400, glycerol, lignin and concentrated sulfuric acid into a reaction kettle according to the formula, wherein the polyethylene glycol 400 accounts for 40-50% of the raw materials, the glycerol accounts for 20-25% of the raw materials, the lignin accounts for 25-40% of the raw materials, and the concentrated sulfuric acid accounts for 0.5-1% of the raw materials.
2) High temperature liquefaction
And heating the mixed materials to 140-160 ℃, and liquefying the mixed materials at the temperature for 60-90 min under normal pressure.
3) Neutralizing and dewatering
Adding sodium hydroxide particles with the same chemical reaction amount according to the amount of concentrated sulfuric acid in the formula, neutralizing the sodium hydroxide particles with the materials in the reaction kettle, and dehydrating in vacuum under the vacuum degree of 0.09MPa until no condensate is generated.
4) Cooling and lowering the temperature
And cooling the material to normal temperature by a cooling system of the reaction kettle to obtain a finished product of the biological polyol.
5) Composite biological polyol product
And adding a certain amount of flame retardant, foam stabilizer and foaming agent into the finished product of the biological polyol, and uniformly mixing to obtain the finished product of the combined biological polyol.
6) Biomass-based polyurethane rigid foam material
When the composite biological polyol rigid foam material is needed to be used, the composite biological polyol finished product and isocyanate are mixed at a high speed according to a proportion by a spraying or casting polyurethane foaming machine to obtain the biomass-based polyurethane rigid foam material.
Third), the concrete steps and parameter description of the biomass-based wall body profile process are as follows:
the biomass-based thermoplastic material hollow wall section is cut into sections with different lengths, and because the section is hollow, the biomass-based polyurethane hard foam material is sprayed or cast in the inner space of the section by a polyurethane spraying or casting foaming machine to form the solid biomass-based wall section.
Fourth), biomass-based combined wall body process concrete steps
The solid biomass-based wall profile is combined into a biomass-based combined wall through certain auxiliary components.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. The preparation method of the biomass-based combined wall body is characterized by comprising the following steps of:
mixing 75-90 parts by mass of dry lignin, 5-20 parts by mass of PVC resin and 5 parts by mass of a lubricant, and then putting the mixture into a high-temperature double-screw thermoplastic extruder for thermoplastic extrusion, wherein a discharge port of the extruder is provided with a hollow wall section mould, so that a hollow biomass-based thermoplastic wall section can be obtained;
putting 40-50 parts by mass of polyethylene glycol 40040-50 parts, 20-25 parts by mass of glycerol, 25-40 parts by mass of lignin and 0.5-1 part by mass of concentrated sulfuric acid into a reaction kettle, stirring, heating the reaction kettle to 140-160 ℃, and carrying out normal pressure liquefaction at the temperature for 60-90 min to obtain a biomass-based polyol liquefaction product; adding sodium hydroxide which has the chemical equivalent reaction quantity with concentrated sulfuric acid in the system into a reaction kettle, dehydrating in vacuum under the condition that the vacuum degree of the reaction kettle is 0.09MPa until no condensate is generated, and cooling to normal temperature to obtain a biological polyol finished product; adding an auxiliary agent into the biological polyol finished product to obtain the combined biological polyol; mixing the composite biological polyol finished product and isocyanate at a high speed according to a proportion by a spraying or casting polyurethane foaming machine to obtain a biomass-based polyurethane rigid foam material;
the biomass-based rigid polyurethane foam material is sprayed or poured in the inner space of the hollow biomass-based thermoplastic wall profile by a polyurethane spraying or pouring foaming machine to form a solid biomass-based wall profile, and then the solid biomass-based composite wall is formed by auxiliary connecting members.
2. The method for preparing the biomass-based combined wall body according to claim 1, wherein the moisture content of the dried lignin is less than or equal to 5% and the mesh number is more than or equal to 400 meshes.
3. The method for preparing the biomass-based combined wall body as claimed in claim 1, wherein the extrusion conditions of the high-temperature twin-screw thermoplastic extruder are as follows: the temperature of the feeding port is 20-80 ℃, the temperature of the conveying section is 80-120 ℃, the temperature of the melting section is 130-160 ℃, the temperature of the shearing and compressing section is 160-180 ℃, and the temperature of the extrusion port is 130-150 ℃.
4. The method of making a biomass-based modular wall of claim 1, wherein the lubricant is a semi-refined paraffin wax.
5. The method for preparing the biomass-based combined wall body according to claim 1, wherein the auxiliary agents are a flame retardant, a foaming agent and a foam stabilizer.
6. The method for preparing the biomass-based combined wall body according to claim 1, wherein the temperature of the reaction kettle is raised to 140-160 ℃ through three stages, and the method comprises the following steps:
in the first stage, the temperature is increased to 100-120 ℃, and the temperature is kept for 10-20 min;
in the second stage, heating to 120-140 ℃, and keeping for 10-20 min;
and in the third stage, heating to 140-160 ℃, and keeping for 60-90 min until liquefaction is finished.
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| CN104356663A (en) * | 2014-12-03 | 2015-02-18 | 松原光禾能源有限公司 | Preparation method of lignin thermoplastic material |
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