CN104563381A - Preparation method for extruded polystyrene (XPS)-foaming cement composite self-thermal-insulation vertical wall building block - Google Patents

Abstract

The invention discloses a preparation method for an extruded polystyrene (XPS)-foaming cement composite self-thermal-insulation vertical wall building block. According to the preparation method disclosed by the invention, the prepared composite building block comprises two parts, namely an XPS insulation board mould body and foaming cement, wherein the XPS insulation board mould body is prepared by an extrusion moulding method and adopts a cuboid structure, the center of the cuboid structure is a cavity, connection reinforcing ribs are arranged in the cavity, the cavity in an XPS insulation board is filled with the foaming cement, and the foaming cement and the XPS insulation board mould body are solidified and bonded together to be utilized as a sandwich material. The composite self-thermal-insulation building block disclosed by the invention has the advantages that the thermal insulation effect is good, the body weight is light, the compressive strength is high, the strength can be regulated and controlled, the shock resistance is high, the sound insulation performance, the seismic performance, the moisture resistance and the frost resistance are good, the long-term stability is excellent, the flame retardance and fire resistance are good (the fireproofing grade of the utilized XPS is B1 and the fireproofing grade of the utilized foaming cement is A), the production process is simple, the construction and building are convenient, and the comprehensive cost is low; the composite self-thermal-insulation building block is especially suitable for construction of passive houses.

Description

A preparation method of XPS-foamed cement composite self-insulating straight wall block

technical field

The invention relates to the technical field of building materials, in particular to an XPS-foamed cement composite self-insulating straight wall block.

Background technique

With the increasing crisis of energy and resources, it is necessary to actively advocate green buildings and strengthen the architectural concept of building energy conservation. Using various wall materials with thermal insulation function can not only save a lot of resources, but also reduce energy consumption and environmental pollution.

In this context, the external wall insulation system has been unprecedentedly developed. However, after the implementation and application in recent years, it was found that the energy-saving method of covering the wall with a jacket did not fundamentally solve the energy-saving problem of the building wall envelope, but also brought many problems such as safety, construction, and cost.

New self-energy-saving wall materials and their thermal insulation systems represent the direction of wall material reform and development because of their obvious energy-saving effects, and are increasingly recognized.

Foamed cement is to fully foam the foaming agent mechanically through the foaming system of the foaming machine, and evenly mix the foam with cement and other cementitious material slurry, and then carry out cast-in-place construction through the pumping system of the foaming machine Or mold forming, a light-weight fireproof and thermal insulation material with a large number of closed pores formed by natural curing. Its advantages are stable performance, small deformation coefficient, fireproof, flame retardant and anti-aging, relatively long service life and relatively difficult construction. Smaller, relatively low engineering cost, and can be recycled. However, due to the limitations of its formulation and technical process, most of the foamed cement products have a single structure, are not stable enough, have high thermal conductivity, insufficient thermal insulation performance, low strength, poor flexibility, and are fragile and fragile.

Extruded polystyrene foam board (XPS for short), which is made of polystyrene resin as raw material plus other raw and auxiliary materials and polymers, is heated and mixed while injecting a catalyst, and then extruded to form a hard board. Quality foam board.

XPS has a perfect closed-cell honeycomb structure, which makes the XPS board light in weight, high in strength, good in flexibility, good in machinability, unbreakable, high in density, good in thermal insulation, and extremely low in water absorption (almost No water absorption), anti-aging (almost no aging decomposition phenomenon in normal use), the disadvantage is that the fire safety performance is insufficient, and there are certain difficulties in actual construction applications.

How to combine XPS and foamed cement technology, overcome their respective defects, give full play to the advantages of both, and prepare a new type of composite self-insulating block is a new research topic in the building materials industry.

There are two main types of blocks manufactured by combining XPS and foamed cement:

One is a composite thermal insulation block with an XPS-foamed cement sandwich structure. The middle of the block is an XPS thermal insulation board, and the two sides are foamed cement. When preparing, insert the XPS thermal insulation board into the mold first, and then insert Foamed cement paste is poured into the remaining space, and after curing, it is cut into insulation blocks by sawing.

The other is to use a mold to make a foamed cement block with various holes in the middle, and then cut the XPS board into a shape that matches the hole of the foamed cement block, and insert it into the hole to form a thermal insulation composite block.

For these two structures, firstly, special molds must be used when making foamed cement blocks, and the production cost is relatively high; secondly, the thermal insulation effect is not satisfactory and needs to be improved, and secondary thermal insulation treatment is still required when used as an exterior wall body.

Contents of the invention

The technical problem to be solved in the present invention is to overcome the defects of the existing single thermal insulation wall material, and provide a preparation method of XPS-foamed cement composite self-thermal insulation straight wall block, which combines organic material XPS and inorganic material foamed cement Combined to form a composite material, give full play to the respective advantages of the two materials, overcome their respective shortcomings, and have excellent comprehensive properties such as not easy to crack, good long-term thermal insulation effect, light weight and high strength, thermal insulation, sound absorption and sound insulation, simple construction, and low cost. Performance, is a new material that integrates building envelope and wall insulation functions, conforms to the advanced direction of wall material development, and is especially suitable for the construction of passive houses.

In order to solve the above problems, the present invention adopts the following technical solutions:

The present invention provides a kind of preparation method of XPS-foam cement composite self-insulation straight wall block, and described preparation method comprises the following steps:

1) Preparation of the XPS insulation board mold body: the straight wall block type XPS insulation board mold body is prepared by extrusion molding process; the XPS insulation board mold body is a cuboid three-dimensional structure with a cavity in the middle, and the cavity Provided with connecting reinforcing ribs;

2) Preparation of foamed cement paste;

3) Integrated molding: pour the foamed cement slurry that has been stirred and mixed into the XPS insulation board mold body; the hydration-hardened foamed cement and the XPS insulation board mold body are cured and bonded together, and cured to become XPS-fat Foam cement integrated composite self-insulation block.

Dovetail grooves are provided on the front and rear surfaces of the XPS insulation board template, the width of the dovetail grooves is 0.5-5cm, the depth is 0.2-0.9cm, and the distance between adjacent dovetail grooves is 1-5cm.

The outer surfaces of the left and right ends of the XPS insulation board mold body are provided with mutually fitting grooves and raised strips. 0.2-2cm, width 1-20cm; in order to reserve adhesive, mortar or mortar gap, the mold body of the block with the same specification, the height of the raised strips on the left and right ends is 0.1-0.5cm smaller than the depth of the groove, and the raised The band width is 0.1-1 cm smaller than the groove width.

The inner surface of the XPS insulation board mold is provided with strip-shaped protrusions, the width of the raised strips is 1-5cm, the height is 0.2-0.9cm, and the interval between adjacent raised strips is 1-10cm.

The wall thickness of the XPS insulation board mold body is 2-8cm, the thickness of the connecting reinforcing ribs is 1-5cm, the interval between the connecting reinforcing ribs is 5-50cm, and the remaining space in the XPS insulation board mold body is filled with hydration-hardened foamed cement.

An arc-shaped groove with a radius of 4-30 cm is arranged in the middle of the top surface and the bottom surface of the reinforcing rib, and the height from the bottom of the groove to the top is 4-30 cm.

The XPS-foamed cement composite self-insulating straight wall block prepared by the present invention uses high-performance XPS as the mold body, and fills the foamed cement in the mold body, so that the block mold body and the foamed cement are solidified to form a whole The self-insulating blocks can be sawn and cut into blocks of the size required by the construction site. The composite self-insulating straight wall block combines the organic material XPS and the inorganic material foamed cement to form a composite material, which fully exerts the respective advantages of the two materials and overcomes their respective deficiencies. The self-insulating block has a simple appearance and is easy to process and produce. The notch fitting design at the left and right ends of the block can effectively block the thermal bridge and increase the thermal performance of the block material. It has light weight, high strength, thermal insulation, sound absorption and insulation. Sound, simple construction, low cost and other excellent comprehensive properties, is a new material that integrates building envelope and wall insulation functions, conforms to the advanced direction of wall material technology development, and is especially suitable for the construction of passive houses.

Using the composite self-insulating straight wall block prepared by the present invention, and then matching the corresponding composite self-insulating T-shaped corner block and L-shaped corner block, there is no need to do wall insulation treatment, and the insulation material has the same service life as the building, not only It can meet advanced building energy-saving standards, and can overcome defects such as cracking of the external wall, peeling off of the external thermal insulation layer, and poor durability of the thermal insulation layer existing in the current external thermal insulation of the external wall. According to the different requirements of the heat transfer coefficient of the outer wall of the building in the north and the south, the thickness of the polystyrene board can be increased or decreased together with the corresponding composite self-insulating corner block to realize flexible factory production, which is suitable for the north Insulation in winter is also suitable for heat insulation in summer in the south, and has wide regional adaptability.

The XPS-foamed cement composite self-insulating straight wall block of the present invention has dovetail grooves on the front and rear outer surfaces of the XPS insulation board mold body, which can strengthen its bonding with the plastering mortar; the inner surface of the XPS insulation board mold body is provided with strips The protrusions can strengthen the connection between the mold body and the foamed cement; the outer surfaces of the left and right ends of the XPS insulation board mold body are provided with mutually fitting grooves and raised belts, and the positions of the grooves and raised belts correspond to each other, which can Realize the fitting of notches and effectively block the thermal bridge; in order to strengthen the horizontal connection strength between the blocks after masonry, adhesive, mortar or mortar can be reserved between the raised bands and grooves on the left and right ends of the mold body Gap; in order to strengthen the XPS mold body’s bearing capacity to the injected foamed cement paste, a connecting reinforcing rib is set between the front and rear walls of the mold body; in order to increase the integrity of the foamed cement in the cavity, the top surface of the reinforcing rib and Grooves filled with foamed cement are prefabricated in the middle of the bottom surface respectively. The raw materials used for the foamed cement filled in the mold are: cement, slag powder, fly ash, lime and water. The block strength and thermal conductivity can be regulated by adjusting the bulk density of foamed cement.

Description of drawings

Figure 1 is a schematic diagram of the structure of the XPS insulation board template.

Figure 2 is a schematic diagram of the structure of the composite self-insulating block integrated with XPS-foamed cement.

Detailed ways

Example 1

1) Preparation of XPS insulation board template:

Adopt extrusion extrusion molding process to prepare straight wall block type XPS thermal insulation board mold body; The structure of XPS thermal insulation board mold body is as shown in Figure 1, and described XPS thermal insulation board mold body is the cuboid structure 1 that is the cavity in the middle, the length × height × thickness = 60cm × 36cm × 24cm, the wall thickness of the XPS insulation board mold body is 5cm, the cavity is provided with connecting reinforcing ribs 2; the thickness of connecting reinforcing ribs is 5cm, and the interval of connecting reinforcing ribs is 10cm.

An arc-shaped groove 3 with a radius of 10 cm is provided in the middle of the top surface and bottom surface of the reinforcing rib, and the height from the bottom end to the top end of the groove is 10 cm.

Dovetail grooves 4 are provided on the front and rear surfaces of the XPS insulation board template. The width of the dovetail grooves is 2 cm, the depth is 0.4 cm, and the distance between adjacent dovetail grooves is 3 cm.

The outer surfaces of the left and right ends of the XPS insulation board mold body are provided with mutually fitting grooves 5 and raised strips 6, the positions of the grooves and the raised strips correspond to each other, and fitting matching can be realized. The height of the belt is 1cm, and the width is 10cm; in order to reserve the adhesive, mortar or mortar gap, the mold body of the block with the same specification, the height of the raised belt on the left and right ends is 0.3cm smaller than the depth of the groove, and the width of the raised belt is smaller than that of the concave. The groove width is 0.5cm smaller.

The inner surface of the XPS insulation board mold is provided with strip-shaped protrusions 7, the width of the raised bands is 3 cm, the height is 0.6 cm, and the interval between adjacent raised bands is 6 cm.

2) Preparation of foamed cement paste:

Weigh 48 kg of 42.5 ordinary Portland cement, 22 kg of S95 grade slag micropowder, 23 kg of secondary fly ash, and 4 kg of lime, and put them into a mixer, add 20 kg of water, and stir for three minutes to obtain cement slurry;

At the same time, mix 0.5kg of vegetable protein foaming agent and 10 kg of water, use a foaming machine to make foam, and introduce the generated foam into the mixer. The volume ratio of foam to cement slurry is 1:2.5; stir for 30 seconds, and mix well , to obtain foamed cement paste;

3) Pour the foamed cement slurry into the above-mentioned XPS insulation board formwork (closed bottom surface, placed horizontally), scrape the top surface, keep the humidity above 95% and the temperature above 65°C for more than 6.5 hours, and hydrate The hardened foamed cement and the XPS insulation board form are solidified and bonded together to become a composite self-insulating block with XPS-foamed cement integration with dimensions of length × height × thickness = 60cm × 36cm × 24cm. as shown in picture 2.

The present invention uses the XPS thermal insulation plate mold body as a mould, without a special mould.

4) Performance indicators of composite self-insulating blocks:

Compressive strength: 7.6 MPa;

Water absorption: 8%;

Average thermal conductivity: 0.06 w/(m.k);

Apparent density: 680 kg/m ³ .

Comparison test of comparative example 1 XPS-foamed cement exterior wall self-insulation system and embodiment 1

The XPS-foamed cement exterior wall self-insulation system uses a composite block with foamed cement on both sides and an XPS insulation board in the middle (different from the XPS in Example 1, it is an XPS insulation board with cylindrical grooves on the board surface) , with the block in Example 1 for comparative test. Contrast block implementation:

1) Preparation of XPS insulation board:

Both sides of the XPS insulation board have concave-convex symmetrical cylindrical grooves, which can be tightly combined with foamed cement.

The thickness of the insulation board is 5cm, the diameter of the cylindrical groove is 2cm, and the interval is 10cm; the thickness of the hardened foamed cement on both sides of the insulation board is 12cm.

2) Preparation of foamed cement paste:

Weigh 42.5 kg of ordinary Portland cement, 22 kg of S95 grade slag powder, 23 kg of secondary fly ash, 4 kg of lime, admixtures (1.0 kg of early strength agent, 1.0 kg of waterproofing agent, 0.46 kg of water reducing agent, Thickener (0.04 kg) 3 kg, put into the mixer, add 20 kg of water, stir for three minutes to obtain cement paste; at the same time, mix 0.5 kg of foaming agent and 10 kg of water in a ratio of 1:20, and use a foaming machine to To make foam, introduce the generated foam into the mixer, stir for another 30 seconds, and mix well to obtain foamed cement paste;

Pour the foamed cement slurry into the special mold inserted into the XPS insulation board in advance, scrape the top surface, keep the humidity above 95% and the temperature above 65°C for more than 6.5 hours, and the foamed cement after hydration and hardening is insulated with XPS The board formwork is solidified and bonded together, and after sawing, it becomes an XPS-foamed cement integrated composite self-insulating block with dimensions of length × height × thickness = 60cm × 36cm × 24cm. The block preparation needs to be equipped with a special mold.

3) Performance indicators of composite self-insulating blocks: compressive strength: 7.8 MPa;

Water absorption: 10%;

Average thermal conductivity: 0.12 w/(m.k)

Apparent density: 700 kg/m ³ .

Comparative Example 2 A comparative test between simple foamed cement block and Example 1.

Simple foamed cement blocks were prepared according to the ratio of raw materials of foamed cement in Example 1 and the size specifications of blocks, and a comparative test was carried out. Contrast block implementation:

1) Preparation of foamed cement blocks:

Weigh 42.5 kg of ordinary Portland cement, 22 kg of S95 grade slag powder, 23 kg of secondary fly ash, 4 kg of lime, admixtures (1.0 kg of early strength agent, 1.0 kg of waterproofing agent, 0.46 kg of water reducing agent, Thickener (0.04 kg) 3 kg, put into the mixer, add 20 kg of water, stir for three minutes to obtain cement paste; at the same time, mix 0.5 kg of foaming agent and 10 kg of water in a ratio of 1:20, and use a foaming machine to To make foam, introduce the generated foam into the mixer, stir for another 30 seconds, and mix well to obtain foamed cement paste;

Pour the foamed cement slurry into a special mold, scrape the top surface, keep the humidity above 95%, and the temperature above 65°C for more than 6.5 hours, sawing and cutting into a shape of length×height×thickness=60cm×36cm×24cm foamed cement blocks. The block preparation needs to be equipped with a special mold.

2) Performance indicators of foamed cement blocks:

Compressive strength: 8.5 MPa;

Water absorption: 11%;

Average thermal conductivity: 0.30 w/(m.k)

Apparent density: 750 kg/m ³ .

Comparative example 3 The comparative test of other material composite blocks and Example 1.

The thermal insulation block compounded by foamed cement prefabricated porous block and XPS was selected, that is, the block mentioned in the background technology section. Use a mold to make foamed cement blocks with various holes in the middle, then cut the XPS board into a shape that matches the holes of the foamed cement blocks, and insert them into the holes to form a composite thermal insulation block. Do a comparison test.

Contrast block implementation:

1) Preparation of foamed cement prefabricated porous blocks and XPS composite insulation blocks:

Weigh 60 kg of 42.5 ordinary Portland cement, 15 kg of S95 grade slag powder, 15 kg of secondary fly ash, 5 kg of lime, admixtures (1.0 kg of early strength agent, 1.0 kg of waterproofing agent, 0.46 kg of water reducing agent, Thickener (0.04 kg) 3 kg, put into the mixer, add 25 kg of water, stir for three minutes to obtain cement slurry; at the same time, mix 0.5 kg of foaming agent and 10 kg of water in a ratio of 1:20, and use a foaming machine to Make foam, introduce the generated foam into the mixer, stir for another 2 minutes, and mix well to obtain foamed cement paste;

Pour the stirred and mixed foamed cement slurry into a special mold for porous blocks, scrape the top surface, keep the humidity above 95% and the temperature above 65°C for more than 6.5 hours, and prepare a shape with the dimensions of length × height × Thickness=60cm×36cm×24cm foamed cement porous block. Then the XPS board is cut into a shape matching the hole of the foamed cement porous block, and inserted into the hole to form a composite thermal insulation block. The block preparation needs to be equipped with a special mold.

2) Performance index of composite self-insulation XPS-foamed cement composite block:

Compressive strength: 5.8 MPa;

Water absorption: 17%;

Average thermal conductivity: 0.18 w/(m.k)

Apparent density: 750 kg/m ³ .

Example 2

1) Preparation of XPS insulation board template:

Adopt extrusion extrusion molding process to prepare straight wall block type XPS thermal insulation board mold body; The structure of XPS thermal insulation board mold body is as shown in Figure 1, and described XPS thermal insulation board mold body is the cuboid structure 1 that is the cavity in the middle, the length × height × thickness = 60cm × 36cm × 24cm, the wall thickness of the XPS insulation board mold body is 5cm, the cavity is provided with connecting reinforcing ribs 2; the thickness of connecting reinforcing ribs is 5cm, and the interval of connecting reinforcing ribs is 10cm.

An arc-shaped groove 3 with a radius of 4 cm is provided in the middle of the top and bottom of the reinforcing rib, and the height from the bottom to the top of the groove is 4 cm.

Dovetail grooves 4 are provided on the front and rear surfaces of the XPS insulation board template. The width of the dovetail grooves is 2 cm, the depth is 0.4 cm, and the distance between adjacent dovetail grooves is 3 cm.

The outer surfaces of the left and right ends of the XPS insulation board mold body are provided with mutually fitting grooves 5 and raised strips 6, the positions of the grooves and the raised strips correspond to each other, and fitting matching can be realized. The height of the belt is 1cm, and the width is 10cm; in order to reserve the adhesive, mortar or mortar gap, the mold body of the block with the same specification, the height of the raised belt on the left and right ends is 0.3cm smaller than the depth of the groove, and the width of the raised belt is smaller than that of the concave. The groove width is 0.5cm smaller.

The inner surface of the XPS insulation board mold is provided with strip-shaped protrusions 7, the width of the raised bands is 3 cm, the height is 0.6 cm, and the interval between adjacent raised bands is 6 cm.

2) Preparation of foamed cement paste:

Weigh 30 kg of 42.5 ordinary Portland cement, put it into a mixer, add 15 kg of water, and stir for three minutes to obtain cement slurry;

At the same time, mix 0.2kg of rosin foaming agent and 2kg of water, use a foaming machine to make foam, introduce the generated foam into a mixer, and the volume ratio of foam to cement slurry is 1:3; stir for 20 seconds, mix evenly, and get Foamed cement paste;

3) Pour the foamed cement slurry into the above-mentioned XPS insulation board formwork (closed bottom surface, placed horizontally), scrape the top surface, keep the humidity above 95% and the temperature above 65°C for more than 6.5 hours, and hydrate The hardened foamed cement and the XPS insulation board form are solidified and bonded together to become a composite self-insulating block with XPS-foamed cement integration with dimensions of length × height × thickness = 60cm × 36cm × 24cm. as shown in picture 2.

Example 3

1) Preparation of XPS insulation board template:

Adopt extrusion extrusion molding process to prepare straight wall block type XPS thermal insulation board mold body; The structure of XPS thermal insulation board mold body is as shown in Figure 1, and described XPS thermal insulation board mold body is the cuboid structure 1 that is the cavity in the middle, the length × height × thickness = 60cm × 36cm × 24cm, the wall thickness of the XPS insulation board mold body is 5cm, the cavity is provided with connecting reinforcing ribs 2; the thickness of connecting reinforcing ribs is 5cm, and the interval of connecting reinforcing ribs is 10cm.

An arc-shaped groove 3 with a radius of 30 cm is provided in the middle of the top surface and bottom surface of the reinforcing rib, and the height from the bottom end to the top end of the groove is 30 cm.

Dovetail grooves 4 are provided on the front and rear surfaces of the XPS insulation board template. The width of the dovetail grooves is 2 cm, the depth is 0.4 cm, and the distance between adjacent dovetail grooves is 3 cm.

The outer surfaces of the left and right ends of the XPS insulation board mold body are provided with mutually fitting grooves 5 and raised strips 6, the positions of the grooves and the raised strips correspond to each other, and fitting matching can be realized. The height of the belt is 1cm, and the width is 10cm; in order to reserve the adhesive, mortar or mortar gap, the mold body of the block with the same specification, the height of the raised belt on the left and right ends is 0.3cm smaller than the depth of the groove, and the width of the raised belt is smaller than that of the concave. The groove width is 0.5cm smaller.

The inner surface of the XPS insulation board mold is provided with strip-shaped protrusions 7, the width of the raised bands is 3 cm, the height is 0.6 cm, and the interval between adjacent raised bands is 6 cm.

2) Preparation of foamed cement paste:

Weigh 42.5 kg of ordinary Portland cement, 15 kg of S95 grade slag micropowder, 15 kg of secondary fly ash, and 5 kg of lime, respectively, and put them into a mixer, add 30 kg of water, and stir for 10 minutes to obtain cement slurry;

At the same time, mix 0.8kg of vegetable protein foaming agent and 16 kg of water, use a foaming machine to make foam, and introduce the generated foam into the mixer. The volume ratio of foam to cement slurry is 1:5; stir for 2 minutes, mix well , to obtain foamed cement paste;

3) Pour the foamed cement slurry into the above-mentioned XPS insulation board formwork (closed bottom surface, placed horizontally), scrape the top surface, keep the humidity above 95% and the temperature above 65°C for more than 6.5 hours, and hydrate The hardened foamed cement and the XPS insulation board form are solidified and bonded together to become a composite self-insulating block with XPS-foamed cement integration with dimensions of length × height × thickness = 60cm × 36cm × 24cm. as shown in picture 2.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims (10)

1. a preparation method of XPS-foamed cement composite self-insulation straight wall block, is characterized in that, described preparation method comprises the following steps: 1) Preparation of the XPS insulation board mold body: the straight wall block type XPS insulation board mold body is prepared by extrusion molding process; the XPS insulation board mold body is a cuboid three-dimensional structure with a cavity in the middle, and the cavity Provided with connecting reinforcing ribs; 2) Preparation of foamed cement paste; 3) Integrated molding: pour the foamed cement slurry that has been stirred and mixed into the XPS insulation board mold body; the hydration-hardened foamed cement and the XPS insulation board mold body are cured and bonded together, and cured to become XPS-fat Foam cement integrated composite self-insulation block. 2. the preparation method of XPS-foamed cement composite self-insulation straight wall block as claimed in claim 1, is characterized in that: two outer surfaces before and after the described XPS insulation board formwork are provided with dovetail groove, and dovetail groove width is 0.5-5cm, the depth is 0.2-0.9cm, and the interval between adjacent dovetail grooves is 1-5cm. 3. the preparation method of XPS-foam cement composite self-insulation straight wall block as claimed in claim 2, is characterized in that: the outer surface of the left and right ends of the XPS insulation board mold body is provided with mutually fitted grooves and The positions of the raised strips, the grooves and the raised strips correspond to each other to achieve fit matching, the depth of the grooves and the height of the raised strips are 0.2-2cm, and the width is 1-20cm; in order to reserve adhesives, mortar or mortar Gap, the mold body of the block with the same specification, the height of the raised strips on the left and right ends is 0.1-0.5cm smaller than the depth of the groove, and the width of the raised strips is 0.1-1cm smaller than the width of the groove. 4. The preparation method of XPS-foamed cement composite self-insulating straight wall block as claimed in claim 3, is characterized in that: the inner surface of the XPS insulation board mold is provided with band-shaped protrusions, and the width of the protrusions is 1 -5cm, the height is 0.2-0.9cm, and the interval between adjacent raised strips is 1-10cm. 5. the preparation method of XPS-foamed cement composite self-insulation straight wall block as claimed in claim 4, is characterized in that: described XPS insulation board formwork wall thickness is 2-8cm, and connecting reinforcement bar thickness is 1-8cm 5cm, the interval between the connecting ribs is 5-50cm, and the remaining space in the XPS insulation board mold is filled with hydration-hardened foamed cement. 6. The preparation method of XPS-foamed cement composite self-insulating straight wall block as claimed in claim 5, is characterized in that: the middle position of the top surface and the bottom surface of the reinforcing rib is provided with an arc with a radius of 4-30cm shaped groove, the height from the bottom of the groove to the top is 4-30cm. 7. The preparation method of XPS-foamed cement composite self-insulating straight wall block as claimed in claim 6, is characterized in that: the dry volume density of described foamed cement is 150-1600kg/m ³ ; Foamed cement raw material The weight ratio is as follows: 30-90 parts of cement, 0-30 parts of fine slag powder, 0-30 parts of fly ash, 0-10 parts of lime, and 25-35 parts of water. 8. the preparation method of XPS-foamed cement compound self-insulation straight wall block as claimed in claim 7, is characterized in that, described foamed cement slurry preparation step is: 1) Mixing of raw materials: According to the weight ratio of foamed cement raw materials, mix 30-90 parts of cement, 0-30 parts of slag powder, 0-30 parts of fly ash, and 0-10 parts of lime. Put the raw materials into the mixer, add 25-35 parts of water, stirred for 2-10 minutes to get cement slurry; 2) Foaming: Mix 0.2-0.8 parts of foaming agent and 2-16 parts of water, use a foaming machine to make foam, introduce the generated foam into a mixer, and the volume ratio of foam to cement slurry is 1:2-5 ; 3) Stir again: Stir again for 20 seconds to 2 minutes to obtain a well-mixed foamed cement paste. 9. The preparation method of XPS-foaming cement composite self-insulating straight wall block as claimed in claim 8, wherein the foaming agent is a vegetable protein foaming agent or a rosin foaming agent. 10. The preparation method of XPS-foamed cement composite self-insulating straight wall block as claimed in any one of claims 1-9, characterized in that the specific steps of pouring the foamed cement slurry are: mixing the mixed The foamed cement slurry is poured into the XPS insulation board mold body, the bottom surface of the XPS insulation board mold body is closed, placed horizontally, the top surface is scraped flat, and left for curing. After the foamed cement is hydrated and hardened, XPS-foamed cement is obtained. Composite self-insulating straight wall blocks.