阅读说明：本技术 一种高强度xps挤塑保温板的制备方法 (Preparation method of high-strength xps extrusion molding insulation board ) 是由 周祥 于 2020-11-24 设计创作，主要内容包括：一种高强度xps挤塑保温板的制备方法,包括如下步骤：(1)制备聚苯乙烯母粒：将高交联聚苯乙烯树脂与热交联剂通过双螺杆挤出机进行挤出造粒,得到聚苯乙烯母粒；(2)制备高强度阻燃母粒：将上述聚苯乙烯母粒与改性可膨胀石墨烯、微胶囊红磷、羟甲基硅油通过双螺杆挤出制备高强度阻燃母粒；(3)制备xps挤塑保温板：将上述聚苯乙烯母粒与高强度阻燃母粒,放入高速混合机混合均匀,在混合过程中加入羟甲基硅油和液体石蜡,混合好后再加入发泡剂,通过同向旋转双螺杆挤出机中进行发泡,然后加入粘合剂浆料。本发明所述的高强度xps挤塑保温板的制备方法,制备步骤设计合理,提高了xps挤塑保温板的力学性能,具有优异的阻燃性能。(A preparation method of a high-strength xps extruded insulation board comprises the following steps: (1) preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches; (2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch; (3) preparation of xps extruded insulation board: the polystyrene master batch and the high-strength flame-retardant master batch are put into a high-speed mixer to be uniformly mixed, the hydroxymethyl silicone oil and the liquid paraffin are added in the mixing process, the foaming agent is added after the mixing, the foaming is carried out in a co-rotating double-screw extruder, and then the adhesive slurry is added. The preparation method of the high-strength xps extrusion-molded insulation board provided by the invention has the advantages that the preparation steps are reasonably designed, the mechanical property of the xps extrusion-molded insulation board is improved, and the insulation board has excellent flame retardant property.)

1. A preparation method of a high-strength xps extrusion molding insulation board is characterized by comprising the following steps:

(1) preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches;

(2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch;

(3) preparation of xps extruded insulation board: the polystyrene master batch and the high-strength flame-retardant master batch are put into a high-speed mixer to be uniformly mixed, hydroxymethyl silicone oil and liquid paraffin are added in the mixing process, a foaming agent is added after the mixing is finished, foaming is carried out in a co-rotating double-screw extruder, then adhesive slurry is added to be extruded and formed to obtain a plate, the plate enters a sizing plate machine, the plate is extruded simultaneously by an upper sizing plate and a lower sizing plate of the sizing plate machine, the plate after sizing is fully cooled by a cooling frame, the edge of the plate is removed by a traction edge removing machine, and the xps extrusion molding insulation board is obtained after the plate is cut by a cutting machine.

2. The method for preparing the high-strength xps extruded insulation board according to claim 1, wherein the mass ratio of the high-crosslinked polystyrene resin to the thermal cross-linking agent in step (1) is 90-100: 1-3; the mass ratio of the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil in the step (2) is 80-85: 10-15: 5-10: 1-5; in the step (3), the mass ratio of the polystyrene master batch to the high-strength flame-retardant master batch to the hydroxymethyl silicone oil to the liquid paraffin to the adhesive slurry is 35-40: 45-50: 1-3: 1-2: 15-20.

3. The method for preparing the high-strength xps extruded insulation board according to claim 1, wherein the preparation of the modified expandable graphene comprises the following steps: heating and stirring absolute ethyl alcohol, deionized water and expandable graphite, adjusting the pH value to 8-9 by using ammonia water, then heating to 45-50 ℃, reacting for 10min, then dropwise adding ethyl orthosilicate for 30min, then continuously stirring for 4-5h at 45-50 ℃, then washing, carrying out suction filtration, and drying for 6h at 55-60 ℃ to obtain the modified expandable graphene.

4. The method for preparing high strength xps extruded insulation board according to claim 1, wherein the extrusion temperature of each section of the twin screw extruder in steps (1) and (2) is 170 ℃, 175 ℃, 180 ℃, 185 ℃ respectively, and the head temperature is 185 ℃.

5. The method of making high strength xps extruded insulation board according to claim 1, wherein the extrusion temperature of each section of the co-rotating twin screw extruder in step (3) is 40 ℃, 150 ℃, 170 ℃, 200 ℃, 190 ℃, 180 ℃, 130 ℃, 125 ℃, 127 ℃, 130 ℃.

6. The method of making a high strength xps extruded insulation board according to claim 1, wherein the microencapsulated red phosphorus is melamine resin coated microencapsulated red phosphorus and the blowing agent is supercritical carbon dioxide.

7. The method of making high strength xps extruded insulation board according to claim 1, wherein the binder slurry comprises 1100g magnesium oxide, seven 350g water reducer, 12g water reducer, 15g modifier per 1L volume of binder, and the balance is water.

Technical Field

The invention belongs to the technical field of preparation of xps extrusion molding insulation boards, and particularly relates to a preparation method of a high-strength xps extrusion molding insulation board.

Background

According to related data, the speed of the global heat insulation material is increased to 5%, wherein China is in one of countries with larger demand of the heat insulation material in the world at present, China is continuously developing at the speed of net increase of building area of nearly 20 hundred million m2, and in addition, 2016 is estimated to occupy 30% of the global heat insulation market, and the number is the sum of the occupancy rates of all developed countries. In addition, environmental protection materials are more and more valued by governments and manufacturing enterprises of various countries, and have quite wide market and space, wherein the foamed plastic accounts for about one third of the total amount.

XPS is a kind of thermal insulation material, which is called as extruded polystyrene foam plastic, and is a rigid foam plastic board made by using polystyrene resin as raw material, adding other raw and auxiliary materials and polymer, heating, mixing and injecting catalyst, then extruding and molding, and has perfect closed-cell honeycomb structure, which makes XPS board have extremely low water absorption, low thermal conductivity, high compression resistance, aging resistance, light weight, high strength, low water absorption, convenient construction, and can be widely used in building roof thermal insulation, steel structure roof, building wall thermal insulation, building floor moisture preservation, plaza floor, floor frost heaving control, central air conditioning ventilation duct, etc. Along with the continuous development of the technology and the continuous improvement of the requirements on the heat insulation materials, higher requirements are also provided for the strength and the high temperature resistance of the xps extrusion molding heat insulation board. Therefore, there is a need to develop a method for making high strength xps extruded insulation board.

Chinese patent application No. CN201910326783.5 discloses a novel shading XPS extruded insulation board, which comprises the following components: ps particles, flame retardant, nucleating agent and blue master batch; the specific formula is prepared from the following raw materials in parts by weight: 200kg of ps particles, 100kg of flame retardant particles, 24kg of flame retardant, 10kg of nucleating agent and 5kg of blue master batch, aiming at enabling the product to have the function of shading, meeting the places with high requirement on light shading performance and not improving the strength and the high temperature resistance of the XPS extrusion molding insulation board.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the preparation method of the high-strength xps extrusion-molded insulation board, which is simple and high in flexibility, improves the mechanical property of xps extrusion-molded insulation board, and has excellent flame retardant property and wide application prospect.

The purpose of the invention is realized by the following technical scheme:

a preparation method of a high-strength xps extruded insulation board comprises the following steps:

(1) preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches;

(2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch;

(3) preparation of xps extruded insulation board: the polystyrene master batch and the high-strength flame-retardant master batch are put into a high-speed mixer to be uniformly mixed, hydroxymethyl silicone oil and liquid paraffin are added in the mixing process, a foaming agent is added after the mixing is finished, foaming is carried out in a co-rotating double-screw extruder, then adhesive slurry is added to be extruded and formed to obtain a plate, the plate enters a sizing plate machine, the plate is extruded simultaneously by an upper sizing plate and a lower sizing plate of the sizing plate machine, the plate after sizing is fully cooled by a cooling frame, the edge of the plate is removed by a traction edge removing machine, and the xps extrusion molding insulation board is obtained after the plate is cut by a cutting machine.

The preparation method of the high-strength xps extrusion-molded insulation board has reasonable design of preparation steps, adopts the compounding of the modified expandable graphene and the microcapsule red phosphorus to replace a brominated flame retardant to be added into polystyrene, improves the mechanical property of the xps extrusion-molded insulation board, ensures that the shape and the density of cells reach the standard of standard boards, and has excellent flame retardant property.

The polystyrene resin belongs to a flammable material, and the limit oxygen index of the polystyrene resin is only 19.6%, so that the polystyrene resin can be fully combusted under sufficient conditions, and the xps extrusion-molded insulation board taking the polystyrene resin as a main raw material has strong flammability, so that huge potential safety hazards are caused.

The high-crosslinked polystyrene resin is modified by the crosslinking, and then forms a crosslinked network structure, so that the flame retardant property and the thermal stability of subsequent materials can be improved, the high-crosslinked polystyrene resin is brominated-naphthalene modified ultrahigh-crosslinked polystyrene resin, has higher specific surface area and mechanical strength, is easy to modify, and is convenient for subsequent compounding with modified expandable graphene, microcapsule red phosphorus and the like; the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil are extruded by a double screw to prepare the high-strength flame-retardant master batch, the modified expandable graphene and the microcapsule red phosphorus have good flame-retardant synergistic effect, an expansion structure formed in the combustion process has high expansion ratio, no toxic, smoke-free and low-corrosive gas, no molten drop exists, the high-strength flame-retardant master batch is safer and more environment-friendly, and the mechanical property of subsequent materials is improved, so that the morphology of subsequent plate cells and the density of the cells are better; and extruding and foaming by using a foaming agent, adding adhesive slurry to further improve the strength, and playing a role in wrapping and flame retarding to obtain a high-strength plate with a micro-foaming structure, and shaping, cooling, trimming and cutting the plate to obtain the high-strength xps extrusion molding insulation board meeting the requirements.

Further, in the preparation method of the high-strength xps extrusion-molded insulation board, in the step (1), the mass ratio of the high-crosslinked polystyrene resin to the thermal crosslinking agent is 90-100: 1-3; the mass ratio of the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil in the step (2) is 80-85: 10-15: 5-10: 1-5; in the step (3), the mass ratio of the polystyrene master batch to the high-strength flame-retardant master batch to the hydroxymethyl silicone oil to the liquid paraffin to the adhesive slurry is 35-40: 45-50: 1-3: 1-2: 15-20.

Further, the preparation method of the high-strength xps extruded insulation board comprises the following steps: heating and stirring absolute ethyl alcohol, deionized water and expandable graphite, adjusting the pH value to 8-9 by using ammonia water, then heating to 45-50 ℃, reacting for 10min, then dropwise adding ethyl orthosilicate for 30min, then continuously stirring for 4-5h at 45-50 ℃, then washing, carrying out suction filtration, and drying for 6h at 55-60 ℃ to obtain the modified expandable graphene.

Through the modification treatment of the expandable graphite, the tetraethoxysilane is firstly hydrolyzed and then polymerized to form a layer of thick coating substance, namely polysiloxane, on the surface of the expandable graphite, and the coating substance can improve the dispersibility of the expandable graphite and the compatibility with other components.

Further, in the above preparation method of the high-strength xps extruded insulation board, the extrusion temperature of each section of the twin-screw extruder in the steps (1) and (2) is 170 ℃, 175 ℃, 180 ℃, 185 ℃ respectively, and the head temperature is 185 ℃.

Further, in the above method for preparing the high-strength xps extruded insulation board, the extrusion temperature of each section of the co-rotating twin-screw extruder in the step (3) is 40 ℃, 150 ℃, 170 ℃, 200 ℃, 190 ℃, 180 ℃, 130 ℃, 125 ℃, 127 ℃ and 130 ℃.

Further, according to the preparation method of the high-strength xps extruded insulation board, the microcapsule red phosphorus is melamine resin coated microcapsule red phosphorus, and the foaming agent is supercritical carbon dioxide.

The invention adopts supercritical carbon dioxide as a foaming agent, has gas viscosity and liquid density, has good compatibility, no toxicity, incombustibility and chemical stability in the preparation process, and can promote the supercritical carbon dioxide to foam to form a micro-foaming structure and improve the foaming effect because the modified expandable graphite can be used as a nucleating agent.

Further, according to the preparation method of the high-strength xps extrusion-molded insulation board, every 1L of the adhesive slurry comprises 1100g of magnesium oxide, seven 350g of water reducing agent, 12g of modifying agent and 15g of water.

The adhesive slurry disclosed by the invention is reasonable in formula and arrangement, further improves the strength of xps extrusion molding insulation boards, and plays a role in wrapping and flame retarding.

Compared with the prior art, the invention has the following beneficial effects:

(1) the preparation method of the high-strength xps extrusion molding insulation board has the advantages of reasonable design of preparation steps and high flexibility; firstly, carrying out extrusion granulation on high-crosslinked polystyrene resin and a thermal cross-linking agent through a double-screw extruder, carrying out thermal cross-linking modification, forming a cross-linked network structure after the high-crosslinked polystyrene resin is subjected to cross-linking modification, and then improving the flame retardant property and the thermal stability of subsequent materials, wherein the high-crosslinked polystyrene resin is bromo-naphthalene modified ultrahigh-crosslinked polystyrene resin, has higher specific surface area and mechanical strength and is easy to modify, and is convenient for subsequent compounding with modified expandable graphene, microcapsule red phosphorus and the like;

(2) according to the preparation method of the high-strength xps extrusion molding insulation board, the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil are extruded by the twin screw to prepare the high-strength flame-retardant master batch, the modified expandable graphene and the microcapsule red phosphorus have good flame-retardant synergistic effect, an expansion structure is formed in the combustion process, the expansion rate is high, no toxic, smoke-free and low-corrosive gas exists, no molten drop exists, the high-strength xps extrusion molding insulation board is safer and more environment-friendly, and the mechanical property of subsequent materials is improved, so that the shape of subsequent board cells and the density of the cells are better;

(3) according to the preparation method of the high-strength xps extrusion molding insulation board, the foaming agent is used for extrusion foaming, the adhesive slurry is added to further improve the strength, the wrapping and flame-retardant effects are achieved, and the high-strength board with the micro-foaming structure is obtained.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following examples 1, 2, and 3 provide a method for making high strength xps extruded insulation board.

Example 1

(1) Preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(3) preparation of xps extruded insulation board: putting the polystyrene master batch and the high-strength flame-retardant master batch into a high-speed mixer for uniform mixing, adding hydroxymethyl silicone oil and liquid paraffin during the mixing process, adding a foaming agent after mixing, foaming in a co-rotating double-screw extruder, and adding adhesive slurry for extrusion molding to obtain a plate; the extrusion temperature of each section of the co-rotating double-screw extruder is respectively 40 ℃, 150 ℃, 170 ℃, 200 ℃, 190 ℃, 180 ℃, 130 ℃, 125 ℃, 127 ℃ and 130 ℃; the method comprises the following steps that a plate enters a sizing plate machine, an upper sizing plate of the sizing plate machine is compounded with a lower sizing plate of the sizing plate machine, the plate is extruded simultaneously, the sized plate is fully cooled through a cooling frame, edges of the plate are removed through a traction edge removing machine, and the plate is cut through a cutting machine to obtain the xps extrusion molding insulation board.

Wherein the mass ratio of the high crosslinked polystyrene resin to the thermal crosslinking agent in the step (1) is 95: 3; the mass ratio of the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil in the step (2) is 80: 14: 8: 2; the mass ratio of the polystyrene master batch, the high-strength flame-retardant master batch, the hydroxymethyl silicone oil, the liquid paraffin and the adhesive slurry in the step (3) is 38: 50: 1: 2: 15.

the microcapsule red phosphorus is coated by melamine resin, and the foaming agent is supercritical carbon dioxide.

The adhesive slurry comprises 1100g of magnesium oxide, seven 350g of magnesium oxide, 12g of water reducing agent and 15g of modifier per 1L of adhesive, and the balance of water.

Example 2

(1) Preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(3) preparation of xps extruded insulation board: putting the polystyrene master batch and the high-strength flame-retardant master batch into a high-speed mixer for uniform mixing, adding hydroxymethyl silicone oil and liquid paraffin during the mixing process, adding a foaming agent after mixing, foaming in a co-rotating double-screw extruder, and adding adhesive slurry for extrusion molding to obtain a plate; the extrusion temperature of each section of the co-rotating double-screw extruder is respectively 40 ℃, 150 ℃, 170 ℃, 200 ℃, 190 ℃, 180 ℃, 130 ℃, 125 ℃, 127 ℃ and 130 ℃; the method comprises the following steps that a plate enters a sizing plate machine, an upper sizing plate of the sizing plate machine is compounded with a lower sizing plate of the sizing plate machine, the plate is extruded simultaneously, the sized plate is fully cooled through a cooling frame, edges of the plate are removed through a traction edge removing machine, and the plate is cut through a cutting machine to obtain the xps extrusion molding insulation board.

Wherein the mass ratio of the high cross-linked polystyrene resin to the thermal cross-linking agent in the step (1) is 90-100: 1-3; the mass ratio of the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil in the step (2) is 82: 15: 8: 3; the mass ratio of the polystyrene master batch, the high-strength flame-retardant master batch, the hydroxymethyl silicone oil, the liquid paraffin and the adhesive slurry in the step (3) is 38: 48: 1: 1: 18.

the microcapsule red phosphorus is coated by melamine resin, and the foaming agent is supercritical carbon dioxide.

The adhesive slurry comprises 1100g of magnesium oxide, seven 350g of magnesium oxide, 12g of water reducing agent and 15g of modifier per 1L of adhesive, and the balance of water.

Example 3

(1) Preparing polystyrene master batch: extruding and granulating the high-crosslinked polystyrene resin and the thermal crosslinking agent by a double-screw extruder to obtain polystyrene master batches; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(2) preparing a high-strength flame-retardant master batch: extruding the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil by a double screw to prepare a high-strength flame-retardant master batch; the extrusion temperature of each section of the double-screw extruder is respectively 170 ℃, 175 ℃, 180 ℃ and 185 ℃, and the temperature of a machine head is 185 ℃;

(3) preparation of xps extruded insulation board: putting the polystyrene master batch and the high-strength flame-retardant master batch into a high-speed mixer for uniform mixing, adding hydroxymethyl silicone oil and liquid paraffin during the mixing process, adding a foaming agent after mixing, foaming in a co-rotating double-screw extruder, and adding adhesive slurry for extrusion molding to obtain a plate; the extrusion temperature of each section of the co-rotating double-screw extruder is respectively 40 ℃, 150 ℃, 170 ℃, 200 ℃, 190 ℃, 180 ℃, 130 ℃, 125 ℃, 127 ℃ and 130 ℃; the method comprises the following steps that a plate enters a sizing plate machine, an upper sizing plate of the sizing plate machine is compounded with a lower sizing plate of the sizing plate machine, the plate is extruded simultaneously, the sized plate is fully cooled through a cooling frame, edges of the plate are removed through a traction edge removing machine, and the plate is cut through a cutting machine to obtain the xps extrusion molding insulation board.

Wherein the mass ratio of the high cross-linked polystyrene resin to the thermal cross-linking agent in the step (1) is 90-100: 1-3; the mass ratio of the polystyrene master batch, the modified expandable graphene, the microcapsule red phosphorus and the hydroxymethyl silicone oil in the step (2) is 80: 15: 10: 2; the mass ratio of the polystyrene master batch, the high-strength flame-retardant master batch, the hydroxymethyl silicone oil, the liquid paraffin and the adhesive slurry in the step (3) is 35: 50: 2: 1: 16.

the microcapsule red phosphorus is coated by melamine resin, and the foaming agent is supercritical carbon dioxide.

The adhesive slurry comprises 1100g of magnesium oxide, seven 350g of magnesium oxide, 12g of water reducing agent and 15g of modifier per 1L of adhesive, and the balance of water.

Effect verification:

the technical properties of the xps extruded insulation boards obtained in example 1, example 2 and example 3 and comparative example 1 (extruded polystyrene foam board) were measured and the results are shown in Table 1.

Mechanical properties: (1) and (3) compression test: selecting the xps extruded insulation board test piece obtained in the embodiment 1, the embodiment 2 and the embodiment 3 and the test piece of the comparative example 1, taking the side surface as an upper and a lower compression surface during molding, putting the test piece on a special clamp, placing the clamp at the center of a press, geometrically centering, pressurizing at 10 mm/min until the test piece is destroyed, recording the ultimate destruction load, and calculating the compressive strength; (2) tensile test: the xps extruded insulation board test pieces obtained in the above examples 1, 2 and 3 and the test piece of the comparative example 1 were selected, the test pieces were measured according to the GB/T1040-2008 standard, three test pieces were used for each group, and the test results were averaged.

Flame retardant property: (1) limiting Oxygen Index (LOI): according to GB/T2406. 19, preparing test pieces of the xps extruded insulation boards obtained in the above embodiments 1, 2 and 3 and the test piece of the comparative example 1, wherein when the test pieces are burnt for 5cm or 3min, the test pieces just extinguish, and the oxygen index displayed in the oxygen index tester is the LOI of the test pieces; (2) horizontal vertical burning rating (UL-94): the xps extruded insulation board test pieces obtained in example 1, example 2 and example 3 and the test piece of comparative example 1 were tested for vertical burning properties in accordance with GB/T2408-1996, and the test pieces were classified according to the standards, V0, V1, V2, NR (no rating).

Thermal insulation performance: the thermal conductivity of the xps extruded insulation boards obtained in examples 1, 2 and 3 and the test pieces of comparative example 1 were measured by using an HFM heat flow meter.

Table 1 results of performance testing

Item	Comparative example 1	Example 1	Example 2	Example 3
					Compressive Strength/Kpa	200	660	680	700
Tensile Strength/KPa	150	500	480	520
					Limiting oxygen index/%)	19.6	29.6	30.1	30.2
Horizontal and vertical combustion class	NR	V0	V0	V0
					Thermal conductivity/W/(m.k)	0.41	0.29	0.27	0.28

As can be seen from table 1, the xps extruded insulation boards of examples 1, 2 and 3 have better mechanical properties, flame retardancy and thermal insulation properties than those of comparative example 1 (extruded polystyrene foam board).

The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.