CN112897967B

CN112897967B - Sludge brick and preparation method thereof

Info

Publication number: CN112897967B
Application number: CN202110168021.4A
Authority: CN
Inventors: 陈勇; 陈熠琦
Original assignee: Lvrun Environmental Technology Ningbo Co ltd
Current assignee: Lvrun Environmental Technology Ningbo Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-06-17
Anticipated expiration: 2041-02-05
Also published as: CN112897967A

Abstract

The application relates to the technical field of building raw materials and production processes thereof, in particular to a sludge brick and a preparation method thereof. The mud brick is prepared from the following raw materials in parts by weight: 45-65 parts of sludge, 30-50 parts of cement powder, 8-16 parts of water, 8-16 parts of epoxy resin, 4-8 parts of curing agent and 1-4 parts of flax fiber. The preparation method comprises the following steps: s1, preparing an original mixed powder and an original mixed slurry respectively; s2, stirring the original mixed powder, the original mixed slurry and the curing agent to form a slurry brick stock solution; s3, filling the slurry brick stock solution into a mould and pressing to obtain a slurry brick rough blank; s4, standing the slurry brick rough blank to obtain the slurry brick. The mud brick has high use strength; in addition, the preparation method has the effect of improving the use strength of the mud brick.

Description

Sludge brick and preparation method thereof

Technical Field

The application relates to the technical field of building raw materials and production processes thereof, in particular to a sludge brick and a preparation method thereof.

Background

Bricks are one of the most common raw materials in construction engineering at present. In China, the solid clay brick is still the most important wall material. The clay brick is prepared by using clay as a main raw material and performing pug treatment, molding, drying and roasting.

The prior Chinese patent publication No. CN102887682B discloses a sintering-free sand washing sludge brick, which is prepared from the following raw materials in parts by weight: 50-60 parts of sand washing sludge, 30-45 parts of cement, 5-10 parts of hydrated lime, 0-1.1 parts of sodium chloride and 8-19 parts of water.

In view of the above-mentioned related technologies, the inventors considered that, since the above-mentioned non-sintered washed-sand sludge brick is bonded only by cement, the compressive strength of the non-sintered washed-sand sludge brick is only 25.12Mpa at most in the actual use process, and the defect of insufficient use strength still exists.

Disclosure of Invention

In order to improve the use strength of the sintering-free sand washing sludge brick, the application provides a slurry brick and a preparation method thereof.

In a first aspect, the present application provides a mud brick, which adopts the following technical scheme:

the mud brick is prepared from the following raw materials in parts by weight: 45-65 parts of sludge, 30-50 parts of cement powder, 8-16 parts of water, 8-16 parts of epoxy resin, 4-8 parts of curing agent and 1-4 parts of flax fiber.

By adopting the technical scheme, as the epoxy resin and the curing agent are used as the bonding materials, the epoxy resin and the curing agent are subjected to curing reaction in the process of preparing the mud brick, and then other raw materials are bonded and coated, so that the effect of improving the use strength of the mud brick is obtained.

In addition, as the flax fibers are used as the additive fibers, the flax fibers provide a reinforcing effect for the mud brick in the actual use process of the mud brick, and the use strength of the mud brick is further improved.

In addition, as the flax fibers have certain hygroscopicity, the flax fibers absorb moisture in the actual use process of the sludge brick, so that the use strength of the sludge brick is indirectly improved.

Preferably, the feed additive is prepared from the following raw materials in parts by weight: 50-60 parts of sludge, 35-45 parts of cement powder, 10-14 parts of water, 10-14 parts of epoxy resin, 5-7 parts of curing agent and 2-3 parts of flax fiber.

By adopting the technical scheme, the raw material proportion in the range is adopted, so that the compatibility of each raw material in the slurry brick can be further improved, and the use strength of the slurry brick is further improved.

Preferably, 8-10 parts of quicklime and 8-10 parts of raw glutinous rice flour are also included.

By adopting the technical scheme, quicklime is used as the added powder to be added into the slurry brick, and because the quicklime and water are easy to react and generate a large amount of reaction heat, the temperature for preparing the slurry brick is improved, and the curing reaction of the epoxy resin and the curing agent is accelerated indirectly.

In addition, raw glutinous rice flour is used as extra added powder to be added into the mud brick, and the raw glutinous rice flour consists of a large amount of branched chain starch, so that the raw glutinous rice flour can be dissolved in water under the action of reaction heat of quicklime to form cooked glutinous rice flour with higher viscosity, and the use strength of the mud brick is indirectly improved through the bonding force of the cooked glutinous rice flour to other raw materials.

In addition, along with the reaction of the quicklime and the water, the quicklime is gradually converted into the hydrated lime, and the hydrated lime has a certain bonding effect, so that the use strength of the mud brick is further improved.

Preferably, the curing agent is alicyclic amine curing agent D-252.

By adopting the technical scheme, the alicyclic amine curing agent D-252 is used as the curing agent to be cured with the epoxy resin, and the alicyclic amine curing agent D-252 has a slow curing reaction, so that the possibility of excessively fast forming is reduced during the preparation of the slurry brick, and the occurrence of inferior slurry bricks is indirectly reduced.

In addition, the alicyclic amine curing agent D-252 and the epoxy resin have stronger curing effect, so that the alicyclic amine curing agent D-252 and the epoxy resin have higher hardness after curing, and the service strength of the sludge brick is indirectly improved.

In addition, the alicyclic amine curing agent D-252 and the epoxy resin have stronger heat resistance after being cured, so that the sludge brick can still maintain certain strength when being used for a long time in a higher-temperature environment, and the use strength of the sludge brick is indirectly improved.

Preferably, the detergent also comprises 1-2 parts of benzyl alcohol.

By adopting the technical scheme, as the benzyl alcohol is used as the catalyst to be added into the slurry brick, the benzyl alcohol can slightly accelerate the curing reaction of the curing agent and the epoxy resin, so that the preparation time for preparing the slurry brick can be indirectly shortened while the normal preparation of the slurry brick is promoted, and the yield of the slurry brick is further improved.

In a second aspect, the application provides a preparation method of a mud brick, which adopts the following technical scheme:

a preparation method of a mud brick comprises the following steps:

s1 preparation of raw materials

S1.1: mixing, drying, grinding and screening the sludge, the cement powder, the quicklime and the raw glutinous rice powder to obtain original mixed powder;

s1.2: stirring flax fibers, epoxy resin, water and benzyl alcohol at a constant speed to obtain original mixed slurry;

s2, mixing the raw materials

Mixing and stirring the original mixed powder, the original mixed slurry and the curing agent to obtain a slurry brick stock solution;

s3 Press Molding

Filling the slurry brick stock solution into a mold, and pressing the mold to obtain a slurry brick rough blank;

s4 standing and curing

And standing the slurry brick rough blank for 6-8 days at normal temperature to obtain the slurry brick.

Through adopting above-mentioned technical scheme, mix original powder and pass through mixing, stoving, grinding and screening process for when mixing original powder reduces moisture through the stoving to its influence, can also increase its and epoxy's area of contact through grinding the screening, improve the service strength of mud brick indirectly.

In addition, the mixed original powder and the original mixed slurry are prepared step by step, so that the mixed original powder and the original mixed slurry can be prepared and stored in advance before the slurry brick is prepared, and the mixed original powder, the mixed original slurry and the curing agent can be directly mixed when the slurry brick needs to be prepared, so that the time for preparing the slurry brick is reduced, and the production efficiency of the slurry brick is improved.

The mud brick is formed by pressing, which can reduce the pollution to the environment and the waste of resources.

Preferably, in S1, the mesh number of the original mixed powder is 600-800 meshes.

By adopting the technical scheme, the mixed original powder adopts the mesh number within the range, so that the surface area of the mixed original powder is increased, the mixed original powder, the mixed original slurry and the curing agent are mixed more uniformly, and the service strength of the slurry brick is indirectly improved.

In addition, the mesh number of the mixed original powder in the range is adopted, so that the possibility of overhigh viscosity of the slurry brick stock solution is reduced, the difficulty of preparing the slurry brick is further reduced, and the efficiency of preparing the slurry brick is indirectly improved.

Preferably, the material of the mold in S3 is polypropylene.

By adopting the technical scheme, the material of the mould is polypropylene, and the polypropylene is not bonded with the epoxy resin, so that the mud brick can be directly taken out of the mould after the mud brick is formed, the demoulding difficulty of the mud brick is reduced, and the production efficiency of the mud brick is improved.

Preferably, in S4, the slurry brick blank is allowed to stand for 3-4 days under indoor conditions and then for 3-4 days outdoors.

By adopting the technical scheme, the mud brick rough blank is firstly kept stand for 3-4 days under indoor conditions, so that the influence of previous insolation and rainfall on the mud brick forming is reduced. And standing the slurry brick rough blank outdoors for 3-4 days, and detecting and screening the slurry bricks through rainfall and insolation to reduce the possibility of occurrence of defective slurry bricks.

In summary, the present application has the following beneficial effects:

1. according to the method, the epoxy resin and the curing agent are used as the bonding materials, and the epoxy resin and the curing agent are subjected to curing reaction to further bond and coat other raw materials, so that the effect of improving the use strength of the sludge brick is obtained.

2. Flax fiber is preferably adopted as the additive fiber in the application, so that the flax fiber has a reinforcing effect on the mud brick in the actual use process of the mud brick, and the use strength of the mud brick is further improved.

3. According to the method, the original mixed powder and the original mixed slurry are prepared step by step, so that the original mixed powder and the original mixed slurry can be prepared and stored in advance before the slurry brick is prepared, and when the slurry brick needs to be prepared, the original mixed powder, the original mixed slurry and the curing agent can be directly mixed, so that the time for preparing the slurry brick is reduced, and the effect of improving the production efficiency of the slurry brick is obtained.

Drawings

Fig. 1 is a flow chart of a method provided herein.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw material components in the application are shown in a table 1:

TABLE 1 sources of the raw material components

Examples

Example 1

The sludge brick is prepared from the following raw materials in parts by weight: 55kg of silt, 40kg of cement powder, 9kg of quicklime, 9kg of raw glutinous rice flour, 2.5kg of flax fiber, 12kg of water, 12kg of epoxy resin, 6kg of alicyclic amine curing agent D-252 and 1.5kg of benzyl alcohol.

The manufacturing method of the sludge brick comprises the following steps:

s1 preparation of raw materials

S1.1: putting the sludge, the cement powder, the quicklime and the raw glutinous rice flour into a stirrer, and dry-mixing for 10min under the condition that the stirring speed is 400 r/min; then placing the mixture in a drying oven, drying the mixture for 2 hours at the temperature of 100 ℃, grinding the mixture and screening the mixture through a sieve plate to obtain the original mixed powder with the mesh number of 700;

s1.2: putting flax fibers, epoxy resin, water and benzyl alcohol into a stirrer, and stirring for 10min at a stirring speed of 400r/min to obtain original mixed slurry;

s2, mixing the raw materials

Putting the original mixed powder, the original mixed slurry and the alicyclic amine curing agent D-252 into a stirrer, and uniformly stirring for 20min at a stirring speed of 800r/min to obtain a slurry brick stock solution;

s3, press forming

Filling the slurry brick stock solution into a polypropylene mould, then placing the mould into a press, and pressing the mould for 3min under the pressure of 30MPa to obtain a slurry brick rough blank;

s4, standing and maintaining

And (3) standing the slurry brick rough blank for 3 days at the indoor temperature of 25 ℃, and then standing for 4 days at the outdoor temperature to obtain the slurry brick.

Examples 2 to 5

The difference from example 1 is that the weight of each component of the raw materials is different, and is specifically shown in table 2.

TABLE 2 materials and weights (kg) thereof in examples 1-5

Example 6

The difference from example 1 is that quicklime and raw glutinous rice flour were not included.

Example 7

The difference from example 1 is that benzyl alcohol, quicklime, and raw glutinous rice flour were not included.

Example 8

The difference from example 1 is that in S1, the mesh number of the original powdery mixture was 600 mesh.

Example 9

The difference from example 1 is that in S1, the mesh number of the original powdery mixture was 800 meshes.

Example 10

The difference from example 1 is that in S4, the slurry brick blank was left standing for only 7 days under room conditions.

Example 11

The difference from example 1 is that in S4, the slurry brick blank was left standing for 7 days only under outdoor conditions.

Example 12

The difference from the example 1 is that in S2, the slurry brick stock solution is directly prepared by mixing and storing sludge, cement powder, quicklime, raw glutinous rice flour, flax fiber, epoxy resin, water and benzyl alcohol.

Example 13

The difference from example 1 is that in S3, the material of the mold is iron.

Comparative example

Comparative example 1

The difference from example 1 is that comparative example 1 is a non-sintered washed sand sludge brick disclosed in the background art.

Comparative example 2

The difference from example 1 is that flax fibers are not included in example 1.

Comparative example 3

The difference from example 1 is that the alicyclic amine curing agent D-252 was replaced with a polythiol curing agent of the same weight, and the polythiol curing agent was GLS805 polythiol curing agent manufactured by Guangzhou Greenwich trade, Inc.

Comparative example 4

The difference from example 1 is that the alicyclic amine curing agent D-252 was replaced with a polyamide curing agent of the same weight, and the polyamide curing agent was 650 polyamide curing agent manufactured by Changzhou Mingzao chemical New Material Co.

Performance test

Test method

10 samples were taken from examples 1 to 13 and comparative examples 1 to 4, respectively, and the taken samples were irradiated with a high-intensity ultraviolet lamp at a temperature of 50 ℃ and a humidity of 80% for 48 hours, followed by performing the following performance tests on each of the above samples and averaging.

Test I, compressive strength test

Referring to a compressive strength test in GB/T2542-2012 'method for testing wall bricks', each sample is made into a sample with a specified size, and then the sample is detected and the compressive strength is calculated.

Test II, flexural Strength test

Referring to a bending strength test in GB/T2542-2012 'method for testing wall bricks', each sample is made into a sample with a specified size, and then the sample is detected and the bending strength is calculated.

Test III, appearance test

Each sample was examined visually and defined as a regular sample, B for a sample with locally significant projections, depressions or cracks, and C for a sample with large areas of projections, depressions or cracks.

And (3) detection results: the test results of the test samples prepared in examples 1 to 13 and comparative examples 1 to 4 are shown in Table 3.

TABLE 3 examination results of samples of examples 1 to 13 and comparative examples 1 to 4

As can be seen by combining examples 1 to 5 with comparative example 1 and by combining table 3, examples 1 to 5 have significantly improved compressive strength and flexural strength as compared with comparative example 1.

The reason for this is that, in examples 1 to 5, additives such as quicklime, raw glutinous rice flour, flax fiber, epoxy resin, alicyclic amine curing agent, and benzyl alcohol were added, and the use strength of the mud brick was improved, so that the compressive strength and the flexural strength of examples 1 to 5 were improved as compared with those of comparative example 1.

Among them, with respect to examples 1 to 5, the compressive strength and the flexural strength were relatively high in examples 1 to 3, indicating that the compressive strength and the flexural strength of the sludge brick were good in the range of the component ratio by weight.

It can be seen from the combination of example 1 and example 6 and Table 3 that the compressive strength and the flexural strength of example 6 are reduced compared to example 1, indicating that the compressive strength and the flexural strength of the sludge brick can be improved by the quicklime and the raw glutinous rice flour.

The reason for this is that the quicklime reacts with water to produce hydrated lime, and the hydrated lime bonds the sludge bricks, thereby improving the compressive strength and the flexural strength of the sludge bricks.

In addition, the reaction heat generated by the reaction of the quicklime and the water accelerates the curing reaction of the alicyclic amine curing agent D-252 and the epoxy resin, thereby indirectly improving the service strength of the sludge brick.

In addition, the reaction heat generated by the reaction of the quicklime and the water promotes the raw glutinous rice flour to be converted into cooked glutinous rice flour, so that other raw materials are bonded, and the compression strength and the flexural strength of the sludge brick are indirectly improved.

When example 1, example 6 and example 7 were combined and table 3 was used, it was found that the compressive strength and the flexural strength of example 7 were reduced compared to example 6, indicating that benzyl alcohol can improve the strength of the sludge brick.

The reason is that the benzyl alcohol can be used as an accelerant to accelerate the curing reaction of the alicyclic amine curing agent D-252 and the epoxy resin, and the compression strength and the breaking strength of the sludge brick are indirectly improved.

In combination with examples 1, 8 and 9 and table 3, it can be seen that the compressive strength and the flexural strength of example 8 are reduced compared to example 1, indicating that the higher mesh count is true

The reason is that along with the increase of the mesh number of the original mixed powder, the contact area of the original mixed powder and the original mixed slurry is increased, so that the components in the sludge brick are fully contacted, and the compressive strength and the flexural strength of the sludge brick are indirectly improved.

However, although the compressive strength and the flexural strength of example 9 were improved compared to example 1, the reason why the appearance of example 9 was B is that the viscosity of the slurry brick raw liquid was increased as the mesh number of the original mixed powder was increased, so that the slurry brick raw liquid could not be completely spread, thereby affecting the appearance of the sludge brick.

When example 1, example 10 and example 11 were combined and table 3 was used, the compressive strength, flexural strength and appearance of example 10 were all reduced compared to example 1, indicating that the outdoor standing had an effect on the compressive strength and flexural strength of the sludge bricks.

The reason is that since the sludge bricks formed only indoors are not screened by rainfall and sunlight, the sludge bricks with poor quality are damaged after the sludge bricks are subjected to the procedures of 50 ℃ temperature, 80% humidity, high-intensity ultraviolet lamp irradiation and the like, so that the compressive strength, the breaking strength and the appearance of the sludge bricks in example 10 are all reduced.

The compressive strength, flexural strength and appearance of example 11 were still reduced from those of example 1, indicating that the compressive strength and flexural strength of the sludge bricks were also affected by the standing in the chamber.

The reason for this is that the sludge bricks formed only outdoors are subjected to rainfall and insolation because they are not completely cured, so that the sludge bricks cannot be completely cured or gaps occur during the curing process, and the compressive strength, the flexural strength and the appearance of example 11 are all reduced.

It can be seen from the combination of example 1 and example 12 and Table 3 that the compressive strength and the flexural strength of example 12 are not much different from those of example 1, but the shape of example 12 is C, which shows that the original mixed powder and the original mixed slurry are prepared and stored separately, and the shape of the sludge brick can be effectively improved.

The reason for this is that in example 12, the slurry brick stock solution was directly prepared by mixing and storing sludge, cement powder, quicklime, raw glutinous rice flour, flax fiber, epoxy resin, water and benzyl alcohol.

In the long-term storage process, quicklime and water react gradually, the reaction heat generated by the reaction of the quicklime and the water promotes raw glutinous rice flour to be converted into cooked glutinous rice flour, and the viscosity component of the slurry brick stock solution is promoted indirectly, so that the slurry brick stock solution cannot be paved completely when the slurry brick coarse blank is prepared, and the appearance of the slurry brick is influenced.

When example 1 and example 13 are combined and table 3 is combined, the appearance of example 13 is obviously worse than that of example 1, which shows that the material of the mold has certain influence on the appearance of the mud brick.

The reason for this is that epoxy resin can bond with iron, so that the operation of demoulding the slurry brick is difficult to implement, and the surface of the finished slurry brick is promoted to be bonded on the surface of a mould in a large area, thereby affecting the appearance of the slurry brick.

As can be seen by combining example 1 and comparative example 2 and combining Table 3, the compressive strength and the breaking strength of comparative example 2 are reduced compared with the examples, which shows that the flax fibers can effectively improve the compressive strength and the breaking strength of the sludge brick.

The reason for this is that the flax fiber can be used as a reinforcing fiber to reinforce the sludge brick, further enhancing the compressive strength and the flexural strength of the sludge brick.

It can be seen by combining example 1, comparative example 3 and comparative example 4 with table 3. The compression strength and the flexural strength of comparative example 3 were enhanced compared to example 1, but the appearance of the comparative example was C. The alicyclic amine curing agent D-252 is better than the GLS805 polythiol curing agent.

The reason is that compared with alicyclic amine curing agent D-252, GLS805 polythiol curing agent can rapidly cure epoxy resin, so that the curing of comparative example 3 is more complete in the same curing time, and the compression strength and the breaking strength of comparative example 3 are obviously improved.

However, the GLS805 polythiol curing agent and the epoxy resin are cured too fast, so that the viscosity of the slurry brick stock solution is rapidly increased, the slurry brick stock solution is promoted to be incapable of being completely paved, and the appearance of the slurry brick is influenced.

In contrast, the compressive strength, the flexural strength and the profile of comparative example 4 were all reduced compared to example 1. The alicyclic amine curing agent D-252 is better than 650 polyamide curing agent.

The reason for this is that the heat resistance and moisture resistance of the 650 polyamide curing agent are slightly poor, so that the compression strength, breaking strength and appearance of comparative example 4 are reduced after the comparative example 4 is subjected to the steps of 50 ℃, 80% humidity, high-intensity ultraviolet lamp irradiation and the like.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The sludge brick is characterized by comprising the following raw materials in parts by weight: 45-65 parts of sludge, 30-50 parts of cement powder, 8-16 parts of water, 8-16 parts of epoxy resin, 4-8 parts of curing agent, 1-4 parts of flax fiber, 8-10 parts of quicklime and 8-10 parts of raw glutinous rice powder.

2. The sludge brick according to claim 1, wherein: the composition is prepared from the following raw materials in parts by weight: 50-60 parts of sludge, 35-45 parts of cement powder, 10-14 parts of water, 10-14 parts of epoxy resin, 5-7 parts of curing agent and 2-3 parts of flax fiber.

3. The sludge brick according to claim 1, wherein: the curing agent is alicyclic amine curing agent D-252.

4. The sludge brick according to claim 3, wherein: also comprises 1-2 parts of benzyl alcohol.

5. A process for the preparation of the sludge brick according to any one of claims 1 to 4, comprising the steps of:

s1 preparation of raw materials

s2, mixing the raw materials

s3 Press Molding

s4 standing and curing

6. The method of manufacturing sludge bricks according to claim 5, wherein: in S1.1, the mesh number of the original mixed powder is 600-800 meshes.

7. The method of manufacturing sludge bricks according to claim 5, wherein: the material of the mold in S3 is polypropylene.

8. The method of manufacturing sludge bricks according to claim 5, wherein: in S4, the mud brick blank is first allowed to stand for 3-4 days under indoor conditions and then allowed to stand for 3-4 days outdoors.