CN105236809A

CN105236809A - Cement grinding aid

Info

Publication number: CN105236809A
Application number: CN201510454088.9A
Authority: CN
Inventors: 丁微
Original assignee: CHONGQING NANCHUAN DISTRICT HAIFENG CEMENT Co Ltd
Current assignee: CHONGQING NANCHUAN DISTRICT HAIFENG CEMENT Co Ltd
Priority date: 2015-07-29
Filing date: 2015-07-29
Publication date: 2016-01-13

Abstract

The invention discloses a cement grinding aid. The cement grinding aid contains the ingredients in parts by mass: 4-20 parts of triethanolamine, 5-20 parts of ethylene glycol, 5-10 parts of ammoniom acetate, 18-23 parts of urea, 3-5 parts of unsaturated polyester resin, 30-40 parts of paper pulp waste lye, 4-12 parts of carboxymethyl cellulose and 5-10 parts of sodium sulfate. According to the cement grinding aid, carboxymethyl cellulose and sodium sulfate are added based on the original cement grinding aid, and carboxymethyl cellulose in the grinding aid can be used for overcoming the phenomenon of powder agglomeration and improving the gradation of granules. Sodium sulfate can be used for accelerating the hydrating and hardening speed of cement, and the degree of hydration of the cement can be increased through using sodium sulfate and triethanolamine in a matched manner. The condition that the fluidity and cohesion of the cement granules are not high can be changed through using carboxymethyl cellulose and sodium sulfate in a matched manner, the fluidity of cement powder can be improved by hydrophobic groups in carboxymethyl cellulose and hydrophilic group molecules in sodium sulfate, and the powder material can be fully ground, so that the fineness and strength of the cement can be improved.

Description

A kind of cement grinding aid

Technical field

The present invention relates to cement field, be specifically related to a kind of cement grinding aid.

Background technology

Cement grinding aid be a kind of add in cement pulverizing course in grinding machine rise grind-aiding effect and don't infringement cement performance additive.It can change the flow velocity of dispersiveness between grinding machine materials inside and cement, improve the transport efficiency of cement, and effectively eliminate electrostatic adhesion and the bag ball paste mill phenomenon of cement subparticle, mill hourly output can be improved and reach about 20%, effectively reduced grinding phenomenon simultaneously, optimize cement granules grating, reduce cement and tail over.Compound grinding aid is also containing working to the cement mixture such as flyash, breeze the exciting agent exciting its lateral reactivity effect, the volume of blended material when improving strength of cement thus increase production cement, reduce grog volume, significantly save the consumption of limestone resource, reduce production cost.Use cement grinding aid when not increasing grinding water and not changing grinding time, annual turnout and labor force can also to be improved, expand the scale of production, reduce the current consumption of ton cement, reduce production cost.

The patent No. is that the patent of invention of CN200610037601.5 discloses a kind of cement grinding aid, be made up of trolamine, ethylene glycol, Ammoniom-Acetate, urea, polyurethane resin and spent pulping liquor, the content (mass percent) of each component is trolamine 4%-20%, ethylene glycol 5%-25%, Ammoniom-Acetate 5%-10%, urea 22%-26%, polyurethane resin 3%-5%, spent pulping liquor 36%-44%.Although the invention eliminates the electrostatic phenomenon in manufacture of cement mechanical milling process, improve output, save electric energy.But find in application process, concrete intensity is not high, and the problem that concrete coagulating time is long.

Summary of the invention

The object of the present invention is to provide a kind of cement grinding aid, not high to solve concrete intensity, and the problem that concrete coagulating time is long.

For achieving the above object, technical scheme of the present invention is as follows: a kind of cement grinding aid, comprise the component composition of following mass fraction: trolamine: 4 parts-20 parts, ethylene glycol: 5 parts-20 parts, Ammoniom-Acetate: 5 parts-10 parts, urea: 18 parts-23 parts, polyurethane resin: 3 parts-5 parts, spent pulping liquor: 30 parts-40 parts, also comprise carboxymethyl cellulose: 4 parts-12 parts, sodium sulfate: 5 parts-10 parts.

The advantage of this programme this programme is: in original cement agent prescription, with the addition of carboxymethyl cellulose and sodium sulfate.Carboxymethyl cellulose belongs to anionic ether of cellulose, for white or oyster white fibrous powder or particle, very stable in basic solution, thickening material is used as in foodstuffs industry, pharmaceutical carrier is used as in medicine industry, can obviously solve powder reuniting phenomenon in grinding aid, improve the grating of particle, increase micro powder granule content.Sodium sulfate makes hydrated product calcium sulphoaluminate generate quickly, thus accelerates the hydration and hardening speed of cement, and sodium sulfate and trolamine with the use of the extent of hydration that can improve cement.In addition owing to there is no independently hydrophobic grouping in ethylene glycol, therefore time as cement grinding aid raw material, between cement granules, the large repulsive interaction of adsorption is little, make the mobility of cement granules and cohesion not strong, therefore by carboxymethyl cellulose and sodium sulfate with the use of changing this situation, hydrophilic class group Molecule in hydrophobic grouping in carboxymethyl cellulose and sodium sulfate can make the mobility of cement powder accelerate, and be that powder obtains sufficient grinding, therefore can improve fineness and the intensity of cement.

Embodiment

Cement grinding aid is configured according to the component of lower list 1, table 2, table 3 and mass fraction.

Table 1

Table 2

Table 3

In above-mentioned each table, its complete processing step is:

The first step: under centigradetemperature 30 degree of conditions, pulp quality waste liquid is filtered out impurity, add trolamine homogenizing (stirring) 15 minutes, add urea and Ammoniom-Acetate again, homogenizing 15 minutes, add polyurethane resin again, the polyurethane resin in this programme adopts metaphenylene unsaturated polyester resin, homogenizing 20 minutes.

Second step: will the carboxymethyl cellulose of 180 sieve meshes be crossed and cross after the sodium sulfate of 180 sieve meshes carries out mixing and stirring, more again carry out uniform stirring in component mixture being incorporated into the first step, churning time is 10 minutes.Then storage is parked and is namely made finished product in 24 hours.

In addition the rotating speed of stirrer is 100r/min-150r/min.

Measuring mechanical property:

Each formula in above-mentioned 3 tables is joined in cement raw material respectively and prepares concrete, carry out effect comparison by the concrete obtained different ingredients.

Cement main raw material is: grog, desulfurated plaster, second class powered coal ash, Laigang slag, Wingdale.

Table 4: cement raw material composition proportion

Grog	Desulfurated plaster	Second class powered coal ash	Laigang slag	Wingdale
					73％	9％	8％	6％	4％

Table 4

In being filled a prescription by grinding aid A formula-Q, all formulas join contrast experiment's table of the concreting machinery performance that cement raw material is prepared respectively.Wherein table 5, table 6, table 7, correspond respectively to the formula table of table 1, table 2, table 3.

The experimental installation selected: YAW-300 type concrete Intensity of Breaking Tester, SM500*500mm-cement test small grinding, stirrer, denseness coagulation time tester, Jiao Shazhen Shitai County, FSY-150 negative pressure sieve, JCT721-2006 cement granules grating determinator, constant-temp. and-moisture maintenance.

Table 5

Table 6

Table 7

By finding out in above-mentioned 3 tables, 1. when the number of carboxymethyl cellulose is 4 parts-12 parts, when the number of sodium sulfate is 5 parts-10 parts, concrete fineness and intensity effect are better (referring to table 6); 2. when carboxymethyl cellulose and sodium sulfate number be not within the scope of the number of table 6, concrete fineness and intensity effect poor (see D formula, E formulation efficacy value in table 5); 3. the concrete that the grinding aid not adding carboxymethyl cellulose and sodium sulfate raw material is produced, its particle fineness reaches 4.2, and the resistance to bend after 28 days is 48.5, and flexural capacity is 7.1, effect the poorest (see A formulation efficacy value in table 5); 4., when carboxymethyl cellulose or sodium sulfate add in grinding aid separately, its fineness and intensity respectively have deficiency (the auspicious Effect value in B formula, C formula in table 5); 5., when the number of carboxymethyl cellulose is 6 parts-10 parts, when the number of sodium sulfate is 6 parts-9 parts, concrete fineness and intensity effect be table 6 better (referring to table 7) comparatively; When the number of carboxymethyl cellulose is 7 parts, when the number of sodium sulfate is 8 parts, effect optimum (referring to N formula in table 7).

Table 8: the N formula of formula number effect optimum is joined in cement raw material with different accounting amounts, prepared concreting machinery performance comparison test table:

Table 8

Proved by the fill a prescription effect experimental of incorporation of N in table 8, when N formula accounts for concrete mechanic effect that 0.12% of cement raw material produces and physical effect is best effect.

Above-described is only embodiments of the invention, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this.Should be understood that; for a person skilled in the art, under the prerequisite not departing from structure of the present invention, some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.The protection domain that this application claims should be as the criterion with the content of its claim, and the embodiment in specification sheets etc. record the content that may be used for explaining claim.

Claims

1. a cement grinding aid, comprise the component composition of following mass fraction: trolamine: 4 parts-20 parts, ethylene glycol: 5 parts-20 parts, Ammoniom-Acetate: 5 parts-10 parts, urea: 18 parts-23 parts, polyurethane resin: 3 parts-5 parts, spent pulping liquor: 30 parts-40 parts, it is characterized in that, also comprise carboxymethyl cellulose: 4 parts-12 parts, sodium sulfate: 5 parts-10 parts.

2. cement grinding aid according to claim 1, is characterized in that, described carboxymethyl cellulose: 6 parts-10 parts, sodium sulfate: 6 parts-9 parts.

3. cement grinding aid according to claim 1, is characterized in that, described carboxymethyl cellulose: 7 parts, sodium sulfate: 8 parts.

4. the cement grinding aid according to any one of claim 1-3, is characterized in that, described polyurethane resin adopts metaphenylene unsaturated polyester resin.

5. the cement grinding aid according to any one of claim 1-3, is characterized in that, the granular size of described carboxymethyl cellulose and sodium sulfate is 180 sieve meshes.