CN1247176A

CN1247176A - Foaming agent for light concrete wall

Info

Publication number: CN1247176A
Application number: CN 99115152
Authority: CN
Inventors: 窦新艺; 张启华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-21
Filing date: 1999-09-21
Publication date: 2000-03-15

Abstract

A foaming agent for light concrete wall contains H2O2 (80-95 wt.%) hydrochloric acid (1-12) and magnesium chloride (2-10). The concentration of H2O2 is higher than or equal to 27.5%. It is suitable for both special thioaluminate cement and ordinary or silicate cement. Its advantages are stable generation of air bubble with uniform size, no cross linking between air bubbles.

Description

Foaming agent for light concrete wall

The invention belongs to porous mortar, concrete product technical field, be specifically related to be used to produce the whipping agent that light concrete wall with holes is used.

Light concrete wall is a great development direction of present building material industry, and it can alleviate the load-bearing of building on the one hand, improves the defective of traditional architecture fat beams and columns, deep foundation.On the other hand it many be core making filler with the industrial residue, energy-conservation profit is useless.In light concrete wall was produced, choosing of whipping agent was gordian technique.Existing many light weight concrete building materials in the prior art, the whipping agent that they adopt have with the aluminium powder is main raw material, and also having with the Expandable Polystyrene (EPS) is main raw material, and foaming effect is all better.But also there are some defectives, the one, be unsuitable for foaming to the Portland cement goods; The 2nd, the bubble size that produces is inhomogeneous, influences the consistence of goods each several part intensity; The 3rd, the bubble train hole that produces is more, influences heat insulation, soundproof effect; The 4th, raw materials cost is higher.

The objective of the invention is at existing concrete whipping agent above shortcomings, provide a kind of not only being applicable to that special efficacy cement products such as sulplo-aluminate are foamed, also be applicable to Portland cement or the foaming of silicate cement mud product, can also stablize and produce the bubble size, better avoid producing the string hole, the light weight concrete building materials whipping agent that cost is low.

For achieving the above object, whipping agent of the present invention is chosen following composition and is formed (weight ratio):

1. hydrogen peroxide: hydrogen peroxide is the main raw material that produces gas, in order to form crafters in goods.Consumption is 80-95%, selects excellent consumption 85-90%, concentration 〉=27.5%.The hydrogen peroxide cost is lower, and is safe in utilization.Certainly, also available other the composition of produced gas replaces hydrogen peroxide, and as phosphoric acid, soda, nitric acid, sulfuric acid etc., but there is defective at the gas volume of security or generation in they on what.

2. hydrochloric acid: can produce oxygen and water with the hydrogen peroxide reaction.Because it is very fast that hydrogen peroxide produces the speed of bubble, in the article of manufacture process, whipping agent must stir in batch mixing equably, this needs certain hour, for making gasification speed consistent with churning time, just must suitably extenuate the generation speed of bubble, the hydrochloric acid in the whipping agent can make hydrogen peroxide reflect a part of water, play and extenuate the speed that hydrogen peroxide produces bubble, make it to coincide with churning time.The consumption of hydrochloric acid is 1-12%, preferred 1-5%.

3. magnesium chloride: since hydrogen peroxide produce steep and vary, single hole is arranged, the string hole is arranged, this will influence the homogeneity of product strength, density.And magnesium chloride and hydrogen peroxide effect, can play stabilise bubbles takes place, and makes it effect of uniform size.The consumption of magnesium chloride is 2-10%, preferred 5-10%.

In addition, also can add small amounts of phosphoric acid, rosin milk etc. in the composition of whipping agent.

This whipping agent adds concrete batching, and its consumption should be equivalent to the 1.2-3% of basic core making filler gross weight.According to status temperature, temperature is low, need add, and the temperature height need add less.

The adding of this whipping agent in the goods process after should being selected in concrete core making filler and stirring, should stir rapidly after going into to add, pour into afterwards in the mould, more than operate according to the performance of selected core making filler.

This whipping agent is used to make light concrete wall, can make to form enough pores in the walling, and be evenly distributed, size is consistent, and makes walling have low unit weight, high strength, premium propertiess such as insulation, sound insulation, heat insulation, waterproof, fire prevention, and the raw materials cost that is adopted is low, and security is good.

Below be to being core making filler and additive, add the Light trabs that this whipping agent makes and carry out every performance index that quality examination obtains with cement, flyash, modified PVA nylon fiber and reinforcing bar, lime, accelerating chemicals, light burnt powder, Tai-Ace S 150:

1. performances such as area density, bending resistance, intensity:

Sheet material with 3000 * 600 * 90mm is detected object, according to JC/T3029-1995 " premises partition wall light lath ", JGJ17-84 " steam-pressing aero-concrete utilisation technology rules ", detected result is as follows: test item technical indicator assay conclusion area density, the qualified bending resistance failing load in kg/m2 ≯ 60 41.6, kg ≮ plate deadweight 74.0 * 0.75 66.5 qualified resistance to impact shock 30kg sand pocket drop 0.5m, 30kg sand pocket drop 0.5m is qualified

Swing is impacted three times, does not go out swing and impacts three times, does not go out

Existing through check. existing through check single-point hanging force be subjected to the 800N single-point to hang masterpiece done by 800N single-point hanging force qualified

Use 24h, through check does not appear. use 24h, through check does not appear. and incendivity is that non-combustible is the qualified drying shrinkage value mm/m of non-combustible ≯ 0.8 0.6 qualified thermal conductivitys, and W/mk 0.14 0.122 is qualified

2. fire performance;

Sheet material with 2800 * 600 * 90mm is detected object, and according to standards such as GB5045-95, the result is as follows:

Interventions Requested technical indicator measured result conclusion

Thermal insulation 120min carries on the back fiery face 120min, carries on the back fiery face

Average temperature rising≤140 ℃, 39 ℃ of average temperature risings are qualified

47 ℃ of peak temperature rise≤180 ℃ peak temperature rises

Integrity 120min, it is qualified that test specimen does not have the 120min of wearing

Fire, light cotton pad or collapse and meet the requirements

The phenomenon of collapsing.

3. uninflammability:

Sheet material with 500 * 600 * 90mm is detected object, and according to GB8624-1997, the result is as follows:

Test item technical indicator assay conclusion

Uninflammability

Temperature rise in the stove, ℃≤50 3 qualified

The sustained combustion time, s≤20 0 are qualified

Mass loss rate, %≤50.0 21.2 are qualified

4. oise insulation factor:

The sheet material thick with 90mm is detected object, and according to GBJ75-84, the result is as follows:

(Hz) 125 250 500 1,000 2,000 4000 is average for frequency

Oise insulation factor 30.6 31.8 26.7 32.5 41.6 47.1 35.1

Conclusion: mean transmission loss: 35.1dB, sound reduction index: 32dB

5. health detects:

Sample size: 1000g

Test basis: GB6566-86

Interventions Requested: radium-226 thorium-232 kalium-40

Detected result:

Radium-226: 119.01 ± 1.93 Bq/kg

Thorium-232:110.88 ± 3.66 Bq/kg

Kalium-40: 764.26 ± 5.46 Bq/kg

MRS： 0.60

MY： 0.96

Evaluation of hygiene:

" putting and build No. 99005 " report according to Chongqing City health and epidemic prevention station estimates as follows to this high-strength lightweight concrete partition plate product radiation hygiene:

Through the nucleic analysis, this product internal radiation index M _RS(0.60＜1.0), external radiation exposure index M _Y(0.96＜1.0) is all less than GB6566-86 restriction I, the requirement of II formula.

This product radioactivity level meets national GB6566-86 " radiation protection standards for construction material " requirement.In construction industry, use unrestricted.

Embodiment:

Whipping agent (kg)

Embodiment 1: hydrogen peroxide (27.5%) 85kg, hydrochloric acid (32%) 2kg, magnesium chloride 10kg, phosphoric acid (85%) 3kg.

Embodiment 2: hydrogen peroxide (27.5%) 87kg, hydrochloric acid (75%) 5kg, magnesium chloride 8kg.

Embodiment 3: hydrogen peroxide (27.5%) 90kg, hydrochloric acid (75%) 3kg, magnesium chloride 7kg.

Embodiment 4: hydrogen peroxide (27.5%) 95kg, hydrochloric acid (38%) 2kg, magnesium chloride 3kg.

Embodiment 5: hydrogen peroxide (27.5%) 80kg, hydrochloric acid (38%) 5kg, magnesium chloride 10kg, phosphoric acid (85%) 3kg, rosin milk 2kg.

Embodiment 6: phosphoric acid (85%) 93kg, hydrochloric acid (38%) 5kg, magnesium chloride 7kg.

Embodiment 7: nitric acid 95kg, hydrochloric acid (38%) 2kg, magnesium chloride 3kg.

Embodiment 8: sulfuric acid 85kg, hydrochloric acid (38%) 2kg, magnesium chloride 10kg, phosphoric acid (85%) 3kg.

Embodiment 9: soda 87kg, hydrochloric acid (75%) 5kg, magnesium chloride 8kg.

Claims

1. foaming agent for light concrete wall is characterized in that composition comprises (weight ratio): hydrogen peroxide 80-95%, hydrochloric acid 1-12%, magnesium chloride 2-10%, hydrogen peroxide concentration 〉=27.5%.

2. light-weight wall material whipping agent according to claim 1 is characterized in that its content is preferably (weight ratio): hydrogen peroxide 85-90%, hydrochloric acid 1-5%, magnesium chloride 5-10%, hydrogen peroxide concentration 〉=27.5%.

3. foaming agent for light concrete wall according to claim 1 and 2 is characterized in that also phosphoric acid, soda, nitric acid or sulfuric acid replace hydrogen peroxide.