CN112679181A

CN112679181A - Premixed dry-mixed waterproof gypsum mortar

Info

Publication number: CN112679181A
Application number: CN202011549480.9A
Authority: CN
Inventors: 赵留臣; 张光森; 史科为; 鲍加赵; 邹启权
Original assignee: Wenzhou Mingyuan Novel Building Material Co ltd
Current assignee: Wenzhou Mingyuan Novel Building Material Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-04-20
Anticipated expiration: 2040-12-24
Also published as: CN112679181B

Abstract

The application relates to the field of gypsum mortar, and particularly discloses premixed dry-mixed waterproof gypsum mortar. The gypsum mortar comprises the following components in parts by weight: 40-90 parts of desulfurized gypsum; 5-35 parts of cement; 5-10 parts of vitrified micro bubbles; 0.1-1 part of cellulose; 0.1-1 part of starch ether; 0.05-2 parts of a gypsum retarder; 0.1-1 part of toughening agent; 1-2.5 parts of waterproof micro powder. The gypsum mortar has good waterproof performance, and can be applied to the easily humid environments such as toilets, wall surfaces and staircases.

Description

Premixed dry-mixed waterproof gypsum mortar

Technical Field

The application relates to the field of gypsum mortar, in particular to premixed dry-mixed waterproof gypsum mortar.

Background

The mortar is prepared by mixing inorganic cementing materials, fine aggregates and water in proportion and is used for masonry and plastering engineering. The mortar is divided into cement mortar, lime mortar and gypsum mortar according to different main materials. The gypsum mortar has the advantages of strong bonding property, less falling ash, early strength, quick hardening and the like, and is healthier, more environment-friendly, durable and durable than the cement mortar.

The premixed dry-mixed gypsum mortar is formed by physically mixing an inorganic cementing material, fine aggregates and an additive according to a certain proportion, and is granular or powdery. The premixed dry-mixed gypsum mortar is transported to a construction site in a bag or bulk form, and can be constructed and applied after being mixed with water.

In the related technology, the gypsum mortar has low softening coefficient and high water absorption, so the waterproof capability is weak, the strength is lost after about 48 hours of soaking, and the construction to the wall surface is limited, so the gypsum mortar cannot be applied to the environments which are easy to be wet, such as a toilet, the wall surface, a staircase and the like.

Disclosure of Invention

In order to improve the waterproof performance of the gypsum mortar, the application provides a premixed dry-mixed waterproof gypsum mortar.

The application provides a premixed dry-mixed waterproof gypsum mortar, which adopts the following technical scheme:

a premixed dry-mixed waterproof gypsum mortar comprises the following components in parts by weight:

40-90 parts of desulfurized gypsum;

5-35 parts of cement;

5-10 parts of vitrified micro bubbles;

0.1-1 part of cellulose;

0.1-1 part of starch ether;

0.05-2 parts of a gypsum retarder;

0.1-1 part of toughening agent;

1-2.5 parts of waterproof micro powder;

the preparation process of the waterproof micro powder is as follows:

firstly, mixing organic silicon and isopropanol to prepare an organic silicon solution with the concentration of 25-30wt%, then mixing 50-60 parts of silica sol and 15-20 parts of organic silicon solution, continuously stirring for 2-3h, then adding 15-20 parts of isopropanol, precipitating gel, standing for 12-24h, drying at the temperature of 100 ℃ and 110 ℃, and finally grinding to obtain the waterproof micro powder.

By adopting the technical scheme, the desulfurized gypsum and the cement are jointly used as the cementing material, the vitrified micro bubbles are used as the filler, the vitrified micro bubbles have stable physical and chemical properties, excellent heat insulation and fire resistance performance is realized, and the heat insulation performance of the mortar can be effectively improved. The cellulose has excellent water retention performance, can improve the cohesiveness and operability of the mortar, and overcomes the problems of easy shelling and hollowing of the mortar. The starch ether thickens the mortar, so that the surface of the mortar becomes smooth, the mortar is easy to coat, and the decorative effect is good. The gypsum retarder is used for reducing the gypsum setting speed, so that the newly mixed mortar can keep plasticity for a long time, and the construction is convenient. The toughening agent is used for improving the toughness of the gypsum mortar and preventing cracking.

The silica sol and the organic silicon are prepared into powder by a gel method, so that the powder plays a good waterproof role in the mortar, and the main characteristic is that high-activity silicon hydroxyl is easy to generate a coordination reaction with cement alkaline substances to generate a new silicate inorganic high molecular compound, so that the waterproof performance of the mortar is improved.

The gypsum mortar is in a dry powder form, is very convenient to transport and prepare, is directly and uniformly mixed with a proper amount of water on a construction site during application, and is coated on a wall by scraping.

Optionally, the preparation process of the organic silicon is as follows: firstly, uniformly mixing 15-20 parts of phenyltrimethoxysilane, 20-30 parts of isopropanol and 5-8 parts of diethylamine, heating to 85-95 ℃, introducing nitrogen for protection, then adding 0.04-0.08 part of tetra-n-butoxy titanium, stirring for reaction for 4-6h, and finally removing low-boiling-point substances in vacuum to obtain the organic silicon.

By adopting the technical scheme, the organic silicon is grafted by the amino group, and the waterproof micro powder obtained by synthesis is easier to permeate in the pores of the mortar, so that a waterproof net is formed in the gypsum mortar, and the waterproof performance of the gypsum mortar is improved.

Optionally, the waterproof micro powder is added in an amount of 2-2.5 parts by weight.

Through adopting above-mentioned technical scheme, generally speaking, the higher waterproof effect that is better that waterproof miropowder mixing volume, but waterproof miropowder mixing volume too high can have certain influence to the setting and hardening of mortar, leads to the compressive strength of mortar to reduce easily. Compared with common ethoxy trimethylsilane and the like, the prepared waterproof micro powder has strong polarity, has small influence on the setting and hardening of mortar, and can be increased in mixing amount, thereby improving the waterproof effect of the gypsum mortar.

Optionally, 2-3 parts of sodium dodecyl benzene sulfonate is added in the preparation process of the waterproof micro powder.

By adopting the technical scheme, on one hand, the nano silicon is favorably and uniformly dispersed, and on the other hand, the waterproof micro powder has a certain reinforcing effect on mortar.

Optionally, the gypsum retarder is a protein gypsum retarder.

By adopting the technical scheme, the protein gypsum retarder has stronger surface adsorption and calcium ion chelation performance, so that the protein gypsum retarder has the advantages of low doping amount, high efficiency and small strength loss; on the other hand, the waterproof micro powder and the protein gypsum retarder have a synergistic effect, and the waterproof micro powder can further reduce the strength loss of the protein gypsum retarder to mortar.

Optionally, the gypsum mortar further comprises 0.3-0.5 part of crab shell powder.

By adopting the technical scheme, the crab shell powder is prepared by recycling waste crab shells, the environmental protection concept is met, and the crab shell powder is favorable for helping the bonding between the waterproof micro powder and the desulfurization gypsum, so that the effect of the waterproof micro powder is improved.

Optionally, the gypsum mortar further comprises 10-30 parts of mineral powder.

By adopting the technical scheme, the mineral powder has uniform color and luster and fine particles, the color of the wall surface is close to that of the interior wall putty after the mortar construction is finished, the surface is smooth and fine, the decorative effect is good, and the interior wall putty does not need to be scraped and coated.

Optionally, the cellulose is hydroxypropyl methylcellulose.

By adopting the technical scheme, the hydroxypropyl methyl cellulose has excellent construction property, water retention property and compatibility, and can improve the bonding strength between the gypsum mortar and the base layer.

Optionally, the gypsum mortar further comprises 0.1-0.3 parts of a lubricant.

By adopting the technical scheme, when the gypsum mortar is mixed with water, the lubricant can separate particles and is easy to move, the flow resistance is reduced, and the construction is convenient.

Optionally, the toughening agent is lignocellulose.

By adopting the technical scheme, the lignocellulose has excellent toughening and cracking resistance effects, and is beneficial to reducing the dehydration rate, fully hydrating and improving the bonding strength between the gypsum mortar and the base layer.

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

1. according to the application, the organic silicon and the silica sol are adopted to prepare the waterproof micro powder, and the high-activity silicon hydroxyl is easy to perform coordination reaction with cement alkaline substances to generate a new silicate inorganic high-molecular compound, so that the gypsum mortar has excellent waterproof performance and can be applied to construction in a humid environment;

2. according to the application, phenyltrimethoxysilane grafted amino is preferably used as organic silicon, so that the influence of the waterproof micro powder on the setting and hardening of the mortar is small, the mixing amount can be increased, and the waterproof effect of the gypsum mortar is further improved.

Detailed Description

The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.

The embodiment of the application adopts the following raw materials:

the desulfurized gypsum is dihydrate desulfurized gypsum; the cement is PO42.5 common silicate cement powder; the grain size of the vitrified micro bubbles is 100 meshes; starch ether model number FP6, purchased from elvan, the netherlands; the silica sol was alkaline, had a solid content of 30wt%, and was model JN-1430-A1, purchased from Han Si products, Inc., Lin Yi City; the protein gypsum retarder is G18, and is purchased from Jiangsu Mega building materials science and technology company; crab shell powder, namely powder prepared by cleaning, drying and grinding crab shells, is purchased from Shandong sunshine aquatic products Co., Ltd; lubricant, model 987, was purchased from bike, germany.

Examples of preparation of Silicone

Preparation example 1:

the preparation process of the organic silicon comprises the following steps: firstly, uniformly mixing 15 parts of phenyltrimethoxysilane, 20 parts of isopropanol and 5 parts of diethylamine, heating to 85 ℃, introducing nitrogen for protection, then adding 0.04 part of tetra-n-butoxy titanium, stirring for reaction for 4 hours, and finally removing low-boiling-point substances in vacuum at the temperature of 75 ℃ and the vacuum degree of 120kPa to obtain the organic silicon.

Preparation example 2:

the preparation process of the organic silicon comprises the following steps: firstly, uniformly mixing 20 parts of phenyltrimethoxysilane, 30 parts of isopropanol and 8 parts of diethylamine, heating to 95 ℃, introducing nitrogen for protection, then adding 0.08 part of tetra-n-butoxy titanium, stirring for reaction for 6 hours, and finally removing low-boiling-point substances in vacuum at the temperature of 75 ℃ and the vacuum degree of 120kPa to obtain the organic silicon.

Preparation example 3:

the preparation process of the organic silicon comprises the following steps: firstly, uniformly mixing 18 parts of phenyltrimethoxysilane, 25 parts of isopropanol and 6 parts of diethylamine, heating to 90 ℃, introducing nitrogen for protection, then adding 0.06 part of tetra-n-butoxy titanium, stirring for reaction for 5 hours, and finally removing low-boiling-point substances in vacuum at the temperature of 75 ℃ and the vacuum degree of 120kPa to obtain the organic silicon.

Example 1:

a premixed dry-mixed waterproof gypsum mortar is prepared by mixing 40 parts of desulfurized gypsum, 5 parts of cement, 5 parts of vitrified micro-beads, 0.1 part of carboxymethyl cellulose, 0.1 part of starch ether, 0.05 part of sodium citrate, 0.1 part of lignocellulose and 1 part of waterproof micro-powder in parts by weight.

The preparation process of the waterproof micro powder is as follows:

firstly, mixing ethoxy trimethylsilane and isopropanol to prepare an organic silicon solution with the concentration of 25wt%, then mixing 50 parts of silica sol and 15 parts of organic silicon solution, continuously stirring for 2 hours, then adding 15 parts of isopropanol, precipitating gel, standing for 12 hours, drying at 100 ℃, finally grinding, and sieving with a 200-mesh sieve to obtain the waterproof micro powder.

Example 2:

the premixed dry-mixed waterproof gypsum mortar is prepared by mixing 90 parts by weight of desulfurized gypsum, 35 parts by weight of cement, 10 parts by weight of vitrified micro-beads, 1 part by weight of carboxymethyl cellulose, 1 part by weight of starch ether, 2 parts by weight of sodium citrate, 1 part by weight of lignocellulose and 2 parts by weight of waterproof micro-powder.

The preparation process of the waterproof micro powder is as follows:

firstly, mixing ethoxy trimethylsilane and isopropanol to prepare an organic silicon solution with the concentration of 30wt%, then mixing 60 parts of silica sol and 20 parts of organic silicon solution, continuously stirring for 3 hours, then adding 20 parts of isopropanol, precipitating gel, standing for 24 hours, drying at 110 ℃, finally grinding, and sieving with a 200-mesh sieve to obtain the waterproof micro powder.

Example 3:

the premixed dry-mixed waterproof gypsum mortar is prepared by mixing 60 parts of desulfurized gypsum, 20 parts of cement, 8 parts of vitrified micro-beads, 0.5 part of carboxymethyl cellulose, 0.5 part of starch ether, 1 part of sodium citrate, 0.5 part of lignocellulose and 1.5 parts of waterproof micro-powder in parts by weight.

The preparation process of the waterproof micro powder is as follows:

firstly, mixing ethoxy trimethylsilane and isopropanol to prepare an organic silicon solution with the concentration of 28wt%, then mixing 55 parts of silica sol and 18 parts of organic silicon solution, continuously stirring for 2.5h, then adding 18 parts of isopropanol, precipitating gel, standing for 18h, drying at 105 ℃, finally grinding, and sieving with a 200-mesh sieve to obtain the waterproof micro powder.

Example 4:

the difference from example 3 is only that the amount of the water-repellent fine powder was 2 parts.

Example 5:

the difference from example 3 is only that the amount of the water-repellent fine powder was 2.5 parts.

Example 6:

the difference from example 3 is only that ethoxytrimethylsilane and the like are mass-exchanged for the silicone obtained in preparation example 1.

Example 7:

the difference from example 3 is only that ethoxytrimethylsilane and the like are mass-exchanged for the silicone obtained in preparation example 2.

Example 8:

the difference from example 3 is only that ethoxytrimethylsilane and the like are mass-exchanged for the silicone obtained in preparation example 3.

Example 9:

the difference from example 8 is only that the amount of the water-repellent fine powder was 2 parts.

Example 10:

the difference from example 8 is only that the amount of the water-repellent fine powder was 2.5 parts.

Example 11:

the difference from example 8 is only that 2 parts of sodium dodecylbenzenesulfonate was added during the preparation of the waterproof fine powder when the silica sol and the organosilicon solution were mixed.

Example 12:

the difference from example 8 is only that 3 parts of sodium dodecylbenzenesulfonate was added during the preparation of the waterproof fine powder when the silica sol and the organosilicon solution were mixed.

Example 13:

the difference from example 3 is only that 3 parts of sodium dodecylbenzenesulfonate is added during the preparation of the waterproof micropowder while mixing the silica sol and the organosilicon solution.

Example 14:

the difference from example 12 is only that the quality of sodium citrate and the like is replaced by a protein gypsum retarder.

Example 15:

the difference from example 3 is only that the quality of sodium citrate and the like is replaced by a protein gypsum retarder.

Example 16:

the only difference from example 8 is that the gypsum mortar also comprises 0.3 parts of crab shell powder.

Example 17:

the only difference from example 8 is that the gypsum mortar also comprises 0.5 parts of crab shell powder.

Example 18:

the only difference from example 3 is that the gypsum mortar also comprises 0.5 parts of crab shell powder.

Example 19:

the difference from example 3 is only that the gypsum mortar also contains 10 parts of mineral powder.

Example 20:

the difference from example 3 is only that the gypsum mortar also contains 30 parts of mineral powder.

Example 21:

the difference from example 3 is only that carboxymethyl cellulose and the like are mass-replaced with hydroxypropyl methyl cellulose.

Example 22:

the only difference from example 3 is that the gypsum mortar also comprises 0.1 parts of a lubricant.

Example 23:

the only difference from example 3 is that the gypsum mortar also comprises 0.3 parts of a lubricant.

Comparative example 1:

the only difference from example 3 is that the gypsum mortar does not comprise water-repellent micropowder.

Comparative example 2:

the difference from example 3 is only that the mass of the water-repellent fine powder and the like is replaced with 500-mesh silica.

Testing the performance of the gypsum mortar:

the gypsum mortar of examples 1-23 and comparative examples 1 and 2 is mixed with mixing water to prepare construction slurry, and the amount of the mixing water is determined according to the method of 'determination of standard diffusibility water consumption' in GB/T28627-.

With reference to the specifications of GB/T28627-2012 plastering gypsum and GB/T5486.3-2001 inorganic hard heat-insulating product test method density, water content and water absorption, the construction slurry is prepared into test pieces and tested for compressive strength, water absorption and softening coefficient of 7d, and the obtained results are recorded in Table 1.

TABLE 1 Gypsum mortar Performance test results recording Table

	Compressive strength/MPa	Water absorption/%)	Coefficient of softening		Compressive strength/MPa	Water absorption/%)	Coefficient of softening
								Example 1	2.7	6.3	0.78	Example 14	2.7	4.3	0.88
Example 2	2.5	5.8	0.81	Example 15	2.7	5.8	0.80
								Example 3	2.7	5.9	0.79	Example 16	2.7	5.2	0.84
Example 4	2.5	5.2	0.84	Example 17	2.7	4.8	0.86
								Example 5	2.1	4.6	0.87	Example 18	2.7	5.9	0.80
Example 6	2.7	5.6	0.82	Example 19	2.7	5.8	0.80
								Example 7	2.7	5.5	0.82	Example 20	2.6	5.5	0.81
Example 8	2.7	5.5	0.83	Example 21	2.7	5.9	0.79
								Example 9	2.7	4.7	0.87	Example 22	2.7	5.8	0.80
Example 10	2.6	3.8	0.90	Example 23	2.7	5.7	0.81
								Example 11	2.9	5.5	0.83	Comparative example 1	2.7	16.3	0.41
Example 12	3.0	5.4	0.84	Comparative example 2	2.7	15.2	0.45
								Example 13	2.7	5.8	0.80	/	/	/	/

From table 1, it can be derived:

1. according to the comparison of the test results of the examples 1-3 and the comparative examples 1-2, the addition of the waterproof micro powder is beneficial to improving the waterproof performance of the gypsum mortar, so that the gypsum mortar meets the construction requirement of a humid environment;

2. according to the comparison of the test results of the examples 3-5, the waterproof micro powder prepared from the ethoxy trimethylsilane is too high in mixing amount, the waterproof performance of the gypsum mortar is improved, but the compressive strength is reduced;

3. according to the comparison between the test results of the example 3 and the test results of the examples 6 to 8, compared with ethoxytrimethylsilane, the specially prepared organic silicon is beneficial to improving the waterproof effect of the waterproof micro powder;

4. according to the comparison of the test results of the examples 8-10, when the mixing amount of the waterproof micro powder prepared by the special organic silicon is too high, the influence on the compressive strength of the gypsum mortar is small;

5. according to the comparison of the test results of the example 8 and the examples 11 to 13, the sodium dodecyl benzene sulfonate has a synergistic effect on the special waterproof micro powder, is beneficial to improving the strength of the mortar, and does not work on the common waterproof micro powder;

6. according to the comparison of the test results of the example 12, the example 14 and the example 15, the protein gypsum retarder is beneficial to improving the waterproof performance of the mortar;

7. according to the comparison between the test results of the example 8 and the test results of the examples 16 to 18, the crab shell powder can act between the special waterproof micro powder and the gypsum to improve the waterproof performance of the mortar.

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 ready-mixed dry-mixed waterproof gypsum mortar is characterized by comprising the following components in parts by weight:

40-90 parts of desulfurized gypsum;

5-35 parts of cement;

5-10 parts of vitrified micro bubbles;

0.1-1 part of cellulose;

0.1-1 part of starch ether;

0.05-2 parts of a gypsum retarder;

0.1-1 part of toughening agent;

1-2.5 parts of waterproof micro powder;

the preparation process of the waterproof micro powder is as follows:

2. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the preparation process of the organic silicon comprises the following steps: firstly, uniformly mixing 15-20 parts of phenyltrimethoxysilane, 20-30 parts of isopropanol and 5-8 parts of diethylamine, heating to 85-95 ℃, introducing nitrogen for protection, then adding 0.04-0.08 part of tetra-n-butoxy titanium, stirring for reaction for 4-6h, and finally removing low-boiling-point substances in vacuum to obtain the organic silicon.

3. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 2, wherein: the addition weight part of the waterproof micro powder is 2-2.5 parts.

4. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 2, wherein: 2-3 parts of sodium dodecyl benzene sulfonate is also added in the preparation process of the waterproof micro powder.

5. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 4, wherein: the gypsum retarder is a protein gypsum retarder.

6. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the gypsum mortar also comprises 0.3-0.5 part of crab shell powder.

7. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the gypsum mortar also comprises 10-30 parts of mineral powder.

8. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the cellulose is hydroxypropyl methyl cellulose.

9. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the gypsum mortar also comprises 0.1-0.3 part of lubricant.

10. The ready-mixed dry-mixed waterproof gypsum mortar according to claim 1, wherein: the toughening agent is lignocellulose.