CN105271984A

CN105271984A - Titanium dioxide dry mixed mortar

Info

Publication number: CN105271984A
Application number: CN201510635184.3A
Authority: CN
Inventors: 沈圣祥; 李凤必
Original assignee: Anhui Kunlong Building Materials Co Ltd
Current assignee: Anhui Kunlong Building Materials Co Ltd
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2016-01-27

Abstract

The invention discloses a titanium dioxide dry mixed mortar. The titanium dioxide dry mixed mortar is prepared through mixing, by weight, 10-15 parts of cement, 15-20 parts of titanium dioxide, 5-9 parts of silica fume, 60-70 parts of sand and 1-2 parts of cellulose ether. Alkaline treated titanium dioxide is adopted to substitute one part of cement to reduce the production cost, and the specific surface area of the silica fume is controlled to enhance the filling effect, so compared with titanium dioxide dry mixed mortars prepared in the prior art, the mortar prepared in the invention has the advantages of excellent dispersion, continuous increase of the later strength, good water retention, strong adhesion stress in the solidification process, and effective avoiding of the hollowing phenomenon.

Description

A kind of titanium dioxide dry-mixed mortar

Technical field

The invention belongs to building material technical field, be specifically related to a kind of titanium dioxide dry-mixed mortar.

Background technology

Titanium dioxide industry more than ten mid-term the 1950's of China, main component is titanium dioxide, and its particle is regularly arranged, has grid system, China's titanium white powder aggregated capacity accounts for 30% of the world, be titanium white production state the biggest in the world, current titanium dioxide is generally used in coating system, improves the performance of coating, reduce the use cost of material, along with constantly research is carried out, find that titanium dioxide is after modification except possessing existing premium properties, also there is some other performance.

Titanium dioxide purity is higher, epigranular, and have excellent high thermal resistance, density is lower, has good dispersiveness, suitability, chemical stability and weathering resistance, produces and the equal environmentally safe of use procedure, meets the industry policy of national sustainable development.

And the main raw material producing dry-mix at present has: cement, lime, gypsum, flyash, slag micropowder, sand, admixture etc., the cement of current use is as a kind of important gelling material, be widely used in the engineerings such as civil construction, water conservancy, national defence, and cement output maintains negative growth at present, and the mortar to be prepared by cement in use, easily there is the phenomenons such as hollowing, therefore to research and the further raising of processing technology needs of dry-mix.

Summary of the invention

The object of the invention is for existing problem, provide a kind of titanium dioxide dry-mixed mortar.

The present invention is achieved by the following technical solutions: a kind of titanium dioxide dry-mixed mortar, is mixed by the batching of following weight proportion: cement 10-15 part, titanium dioxide 15-20 part, silicon ash 5-9 part, sand 60-70 part, ether of cellulose 1-2 part.

As further improvement of these options, the ordinary Portland cement of described cement 32.5 or 42.5.

As further improvement of these options, described titanium dioxide uses basic solution process before mixing with other raw materials.

As further improvement of these options, described alkali solution strength of solution is 0.15-0.3wt%, and solute is the mixture of sodium bicarbonate and sodium hydroxide, and both weight ratios are 1:3-2:3.

As further improvement of these options, the treatment process of described titanium dioxide is: in titanium dioxide, add the basic solution with its quality equivalent, and stir 20-40 minute under the condition of 40-50 DEG C after, hold over night is for subsequent use.

As further improvement of these options, the loss on ignition of described silicon ash is less than 6%, dioxide-containing silica is greater than 85%, specific surface area value between 15-25 ㎡/g, particle diameter is less than 1 μm.

As further improvement of these options, described sand is selected from river sand, and tap density is 1480kg/m3, particle diameter < 4.5mm, and fineness modulus is 2.25.

The present invention has the following advantages compared to existing technology: by substituting a part of cement by after titanium dioxide basic treatment, reduce its production cost, the specific surface area of silicon ash is controlled, its filling effect is strengthened, and obtained mortar dispersiveness is excellent, and capacity is little, later strength can constantly increase, good water-retaining property, has stronger cohesive force in process of setting, can effectively avoid the phenomenon occurring hollowing.

Embodiment

Embodiment 1

A kind of titanium dioxide dry-mixed mortar, is mixed by the batching of following weight proportion: the common silicate cement of 42.5 10 parts, with the titanium dioxide 20 parts of basic solution process, and silicon ash 6 parts, 62 parts, sand, ether of cellulose 2 parts.

Wherein, described alkali solution strength of solution is 0.3wt%, solute is the mixture of sodium bicarbonate and sodium hydroxide, both weight ratios are 1:3, the treatment process of described titanium dioxide is: in titanium dioxide, add the basic solution with its quality equivalent, stir after 30 minutes under the condition of 50 DEG C, hold over night is for subsequent use.

Wherein, the loss on ignition of silicon ash is less than 6%, dioxide-containing silica is greater than 85%, specific surface area value between 15-25 ㎡/g, particle diameter is less than 1 μm, sand is selected from river sand, tap density is 1480kg/m3, particle diameter < 4.5mm, and fineness modulus is 2.25.

Each raw material all can be buied in market.

Embodiment 2

A kind of titanium dioxide dry-mixed mortar, is mixed by the batching of following weight proportion: the common silicate cement of 32.5 12 parts, with the titanium dioxide 15 parts of basic solution process, and silicon ash 5 parts, 67 parts, sand, ether of cellulose 1 part.

Wherein, described alkali solution strength of solution is 0.15wt%, solute is the mixture of sodium bicarbonate and sodium hydroxide, both weight ratios are 1:3, the treatment process of described titanium dioxide is: in titanium dioxide, add the basic solution with its quality equivalent, stir after 40 minutes under the condition of 40 DEG C, hold over night is for subsequent use.

Wherein, the index of correlation of silicon ash and sand is in the same manner as in Example 1.

Embodiment 3

A kind of titanium dioxide dry-mixed mortar, is mixed by the batching of following weight proportion: the common silicate cement of 42.5 10 parts, with the titanium dioxide 18 parts of basic solution process, and silicon ash 8 parts, 63 parts, sand, ether of cellulose 1 part.

Wherein, described alkali solution strength of solution is 0.2wt%, solute is the mixture of sodium bicarbonate and sodium hydroxide, both weight ratios are 2:3, the treatment process of described titanium dioxide is: in titanium dioxide, add the basic solution with its quality equivalent, stir after 20 minutes under the condition of 45 DEG C, hold over night is for subsequent use.

By embodiment Raw by weight on dry-mixed mortar production line through mixing and stirring, obtained mortar, be respectively experimental group 1, experimental group 2 and experimental group 3, titanium dioxide in embodiment being replaced into cement is control group, and the ratio of components of control group is: the common silicate cement of 42.5 30 parts, silicon ash 5 parts, 64 parts, sand, ether of cellulose 1 part.

Detect the properties of mortar respectively, draw following data:

Project	Dry density (kg/m3)	Time of coagulation (h)	Water retention (%)	7 days ultimate compression strength (MPa)	28 days ultimate compression strength (MPa)
						Experimental group 1	435	4.68	95.2	7.5	15.4
Experimental group 2	447	4.83	93.6	6.3	13.1
						Experimental group 3	436	4.72	94.8	7.2	14.9
Control group	462	5.04	92.4	6.5	11.5

Table 1

Can be found out by data in table 1, in experimental group 1, titanium dioxide content is higher, the corresponding reduction of dry density thus, the increment of water retention and ultimate compression strength is best, wherein control group is substantially identical with 7 days ultimate compression strength in experimental group 2, but As time goes on, in experimental group 2, the ultimate compression strength of mortar is higher than control group, therefore the titanium dioxide replacing partial cement of basic solution process is selected can to improve the use properties of mortar, simultaneously because titanium dioxide price is lower than cement, titanium dioxide is used to substitute the preparation cost that cement can reduce mortar, mortar is equal environmentally safe in production and use procedure, meet the industry policy of the Sustainable development of country.

Claims

1. a titanium dioxide dry-mixed mortar, is characterized in that, is mixed by the batching of following weight proportion: cement 10-15 part, titanium dioxide 15-20 part, silicon ash 5-9 part, sand 60-70 part, ether of cellulose 1-2 part.

2. a kind of titanium dioxide dry-mixed mortar as claimed in claim 1, is characterized in that, the ordinary Portland cement of described cement 32.5 or 42.5.

3. a kind of titanium dioxide dry-mixed mortar as claimed in claim 1, it is characterized in that, described titanium dioxide uses basic solution process before mixing with other raw materials.

4. a kind of titanium dioxide dry-mixed mortar as claimed in claim 3, it is characterized in that, described alkali solution strength of solution is 0.15-0.3wt%, and solute is the mixture of sodium bicarbonate and sodium hydroxide, and both weight ratios are 1:3-2:3.

5. a kind of titanium dioxide dry-mixed mortar as claimed in claim 3, it is characterized in that, the treatment process of described titanium dioxide is: in titanium dioxide, add the basic solution with its quality equivalent, and stir 20-40 minute under the condition of 40-50 DEG C after, hold over night is for subsequent use.

6. a kind of titanium dioxide dry-mixed mortar as claimed in claim 1, is characterized in that, the loss on ignition of described silicon ash is less than 6%, dioxide-containing silica is greater than 85%, specific surface area value between 15-25 ㎡/g, particle diameter is less than 1 μm.

7. a kind of titanium dioxide dry-mixed mortar as claimed in claim 1, it is characterized in that, described sand is selected from river sand, and tap density is 1480kg/m3, particle diameter < 4.5mm, and fineness modulus is 2.25.