Study on Formulation Optimization of Polystyrene Particle Insulation Mortar Adhesive Powder

Polystyrene pellet insulation mortar; glue powder material; organic polymer binder; formulation optimization; construction properties; cohesive strength polyphenyl particle mortar as a kind of insulation material, or compound with other insulation systems, can adapt to China to a certain extent Energy-saving building requirements in certain areas.

Polystyrene particles thermal insulation mortar is usually supplied to the construction site in the form of polyphenylene granules and rubber powder separately. The workers must first mix the powdery powder with water and mix them into a slurry, then add the quantitative polyphenylene granules and mix them into light mortar. . During the on-site mixing process, the application of polyphenylene granules insulation mortar, water absorption, compressive strength, etc. play a decisive role, in addition to the addition of polyphenylene granules and its morphology, particle size, distribution, the plastic powder material Performance is also a key factor. In this regard, WACKER Shanghai Technology Center made a specific study.

2 Experimental design 2.1 Raw material recycling Broken polystyrene foam particles 2mm4mm, bulk density 13.75kg/m3; Conch Mingzhu Cement 42.5R; Shanghai Shidongkou Power Plant secondary fly ash; Shanghai Qunxian slaked lime; Shanxi Jinma hemihydrate gypsum powder , Nanjing anhydrite powder; Shanghai produced 325 mesh heavy calcium carbonate powder; Imported Mipolite 818F mineral based thixotropic lubricant, Sichuan Haoyite PP fiber 6mm, Germany JRS wood fiber ZZC500, Germany Hercules starch ether ST2000; Domestic cellulose ether Water Retention Agent KH75000S;Ethylene Vinyl Acetate Copolymer Redispersible Latex Powder V1,Tg=-7°C,Ethylene Vinyl Chloride-Vinyl Vinyl Terpolymer Redispersible Latex Powder V2,Tg=0C,Ethylene - The vinyl acetate copolymer redispersible powder E, Tg = 3C; The hydrophobic agent S is a polyvinyl alcohol-encapsulated silane powder; The reference concrete plate is used for coating polyphenyl granule thermal insulation mortar.

2.2 Test equipment and equipment Wuxi Jianyi JJ-5 cement mortar mixer, used for dry mixed powder and mixed polystyrene particles mortar; aluminum alloy ring, diameter 30mm, height 50mm, used to test the wet bulk density of mortar; Germany Herion drawing device, drawing speed 50N/s, used to test the bulk strength of the polyphenyl particle mortar; Casson tube, used to test the water absorption capacity of the thermal mortar; steel triple trial, 40mm> 40mm> 460mm , for forming the compression resistance test block; steel triple trial mode, 2mm> 2mm> S00mm, for test line shrinkage; Germany Tonic universal testing machine, used to test the compressive and flexural strength of mortar.

2.3 Test formulation design and test items 2.3.1 Formulation design of powder material Test formula design is shown in Table 1. 2.3.2 Insulation mortar mix proportion is regulated according to the proportion of 200kg polyphenyl particle 25kg glue powder material, and firstly according to Table 1 Material, then add quantitative water to a uniform slurry, and slowly add quantitative polyphenylene particles to a uniform lightweight mortar.

2.3.3 Test items Evaluation of the applicability of the rubber powder material Use a small spatula (for tongue pressing in the hospital) to pass through the middle of the slurry to observe the speed of healing of the slurry. Pick up the slurry and observe how fast the slurry drips.

Evaluation of the mortar's construction performance The well-mixed polyphenyl particle mortar was taken out with a rubber picking knife to observe the looseness of the mortar; at the same time, it was observed whether the mortar was easy to droop; the mortar was wiped with a stainless steel spatula onto the wet concrete interface agent, and the mortar was observed. Formula No. Raw Material Formulation System 1 Formulation System 2S0S1S2S3S4S5S6S7S8 Inorganic Cementing Material Conch 42.5R Cement (°/) 6854.5 Stone Dongkou Power Plant Fly Ash (%.) 12-1330 Qunxian Lime (%) 14 Plaster (%) 7 (Shanxi Jin Ma semi-water ointment) 5 (Nanjing anhydrite) fine filler 325 mesh heavy calcium - appropriate amount of water retaining agent KH75000S (%) 0.80.8 construction additives Mipolite818F (%) amount - ZZC500 (%) - 0.28ST2000 (%) - 0.02PP The fiber binder V1V2-1215 is all V2-1 215 All V2-ES is all S--51-51 Total weight 100100100100100100100100100 Water addition (°%) 140140140140140110110110110 Remarks In order to compare with the conditions, except S0 With the exception of the water-repellent agent S, the overall organic binder content of all other formulations remains the same.

System and Formulation Test Project 'Ss System 1 System 2S0S1S2S3S4S5S6S7S8 The construction material can't be dropped, the construction is smooth without sticking the knife, it is easy to compact and light, and the material is easy to throw away. The construction is smooth without sticking the knife, but it is not easy to compact. Flat wet density (kg/m3) 40338338638839236236436433835614d Standard raising the Kast tube water absorption (ml) 1h0.81.41.90.82 18 in the Kastong tube Table 1 powdery powder formula Table 2 Test results are easy to wipe and level of material loss; Observe whether there is a large pit on the surface of the mortar after drying and hardening.

The mortar was filled in the aluminum alloy ring and tapped 20 times each time, and then the surface was wiped and weighed. The added weight was recorded and divided by the volume of the ring to obtain the wet density of the mortar.

The water absorption of the Caston tube on the surface of the mortar was 20±mm. The mortar was fixed on the surface of the mortar with the rubberized clay after 14d, and the water was added to the initial scale to record the amount of water absorbed by the mortar at 1h and 2h.

Mortar Dry Density Test The mortar was filled in the triple trial molds. After the 2d standard raising (23°C, 50% RH) was removed, the dry density was measured before the compressive strength was measured after 7 days of standard cultivation.

Cohesive Strength Test of Mortar The mortar was applied to a concrete slab coated with a concrete interface agent. After the thickness was controlled, a 50mmX50mm > 45mm drawn iron piece was stuck on the surface of the mortar with a thixotropic type quick-curing epoxy resin to perform the 7d standard respectively. Raising, 14d standard raising, 7d standard raising + 7d water raising + 2h standard raising pull test.

Mortar compressive strength test Polystyrene particles mortar was filled in the triple trial mold and compacted, flattened after 2d standard removal, and then tested 7d standard breeding, 14d standard breeding, 7d standard raising + 7d water raising + 2h Standard compressive strength.

Mortar line shrinkage test Fill the mortar into the line shrinkage test mold and compact it. After 2 days of standard raising, remove the touch and test the initial length. Then test the length after 3d, 7d, 14d, and 28d, and calculate the line shrinkage. the amount. 2.4 Test Results and Discussion The test results are shown in Table 2. The square S5S8 powder material healed quickly and was easy to drip (water volume has been adjusted to 110%). The results showed that Formulation 1 had better thixotropic properties and Formulation 2 had no thixotropy. At the same time, it was observed that after adding the same amount of water to the rubber powder, Formulation System 1 can produce more slurry volume, which is the basis for the polyphenylene granules to be wrapped and have good workability (loading, compaction, etc.).

2.4.2 Mortar construction The S8 mortar dry density is not much different. The dry density and compressive strength of the mortar are controlled at a reasonable range. See 4.5. Larger shrinkage will cause cracking of the mortar, see results. It can be seen that formula S0S4 and formula S5 cause the cracking and peeling of the surface finish material, affecting the formulation of the insulation system S0~S4 mortar is tighter and has anti-sagging properties; the formula S5S8 mortar is looser and has a sagging tendency. At the same time, it was observed that the mortar of formula system 1 was easy to feed on the interface agent layer, and the maximum thickness at one time was up to 4 cm, and it was easy to repeatedly trowel; the formula system 2 was easy to feed, but the increase in the material thickness was not easy to repeatedly compact the wipe. Light shows an increase in the amount of dropouts. Observe the mortar after drying. The surface of formula S0~S4 is basically flat, while there are still many pits in formula S5~S8 (the lack of slurry filling between surface polystyrene particles).

2.4.3 Wet Density of Mortar The high wet density of the mortar is due to its good workability which makes the mortar easy to compact.

The wet density of the mortar 2.4.4 The result of the water absorption of the Castell tube on the surface of the mortar. In the formula not shown in the figure, all the 18 ml of water in the KST tube was sucked away in 1 h. Formula S0-S4 is more conducive to the performance of mortar water-repellent performance than formula S5-S8. Mortar formulation plays an important role in the hydrophobicity of mortar. The single-mixed water repellent S showed a strong hydrophobicity in Formulation 1, but when it was simultaneously incorporated with organic polymer binder E, the water repellency of S4 was significantly reduced, which was significantly inferior to S3 mortar.

Inside, it can not only guarantee the insulation effect of mortar, but also make the mortar have better compressive strength and show better apparent hardness. This requires the rubber powder to have good bond and wrap particles and have a strong skeleton. structure.

Formulation S0-S4 has higher mortar compressive strength than formulation S5-S8 mortar, and formula system 1 is superior to formula system 2. 2.4.6 mortar cohesive strength results. The cohesive strength of the mortar reflects the coating force of the polyphenylene granules and the rubber powder. It can be seen that the cohesive strength of formula S0-S4 mortar is better than that of formula S5-S8, especially the 7d standardization and cohesive strength after water resistance; the same organic polymer binder plays a very big role in the formulation system. Correlation.

It should be noted that the test results only in the coating force between the internal rubber powder and the particles. In addition, the moisture on the surface of the mortar often quickly dissipates, requiring the organic polymer to form a film after rapid water loss, so as to function as a binder. Therefore, we The test was supplemented with a mortar evaluation method for surface resistance (a simple evaluation method at the construction site). In Formulation 1, only mortar with water-repellent agent S was used, and the measured cohesive strength was good, but when the mortar surface was dried by hand, it was easy to scrape off the polyphenylene particles and doped with organic polymer. The resistance of other formulas is significantly enhanced.

Therefore, due to the existence of a weak surface layer, combined with its surface water repellent, will inevitably affect the subsequent finish layer and its adhesion, so in practice does not apply.

2.4.7 Line shrinkage of mortar The line shrinkage of the mortar is large, and the shrinkage of the mortar line of the system 2 is larger than that of the formula system 1 (except for S1 and S5, which require further study). It can be seen that the shrinkage of the mortar added with the water repellent S is large, especially in Formulation 2, which needs attention.

2.4.8 Comprehensive analysis of test results Excluding formula S0, comprehensive comparative analysis of the influence of the formulation system or organic binder, that is to add all the test values ​​of the same system or formula containing the same additive and then average them, so that different factors can be eliminated The effects are compared at the same time with the difference between the average values ​​of the different formulation systems or the same organic polymer formulation.

The amount of water absorbed by the Karlstone tube: See the results. Since the formula S5-S8 has completely drained 18ml of water contained in the Kast tube within 1 hour, the water absorption capacity is set here to be 18ml. Dry density and compressive strength: See the results. The average dry density of Formulation 1 is slightly lower than that of Formulation 2, but its compressive strength is higher than that of Formulation 2. This shows that Formula 1's rubber powder has good adhesion and skeletal support. This is consistent with the previous analysis.

Mortar cohesive strength and line shrinkage: See the results. The cohesive strength of Siemens mortar bonded to formula 1 for 7 days is higher than that of formula system 2. The shrinkage of formula 1 mortar is lower than that of formula system 2. The effect of organic polymer binder and hydrophobic agent is shown in Table 3. Table 3 shows that the mortar with V1V2=15 has better cohesive strength, suitable dry density, higher compressive strength, and lower shrinkage; whereas the mortar with ES=51 has greater shrinkage.

Table 3 Effect of Organic Polymer Binder and Water Repellent Test Item Redispersible Latex Powder and Water Repellent All in V2 Cohesion 7d Standard Strength 14d Standard Nutrition 7d Standard Nutrition + 7d Water Culture + 2h Standard Dry Density 7d Standard Compressive Strength 7d Standard 7d Standard + 7d Aquaculture + 2h Standard 3d Standard (%) 7d Standard 14d Standard 28d Standard 3 Conclusion Optimized design of the formula The choice is crucial. Considering the properties of the mortar synthetically, formula 1 is superior to formula 2; formula 1 and organic polymer binder V1V2=1 5 can be selected to obtain a polyphenylene granule thermal insulation mortar with higher cost performance.

More types of additives can increase the possibility of errors in production, and the cost is higher. Therefore, the selection of construction aids should be based on the principle of simplification. In the experiment, we found that Mpolite 818F has a significant effect on improving the properties of the rubber powder and it is worth further studying the mechanism of action.

In the two formulas tested, the addition of the water repellent S significantly increased the shrinkage of the mortar and should be noted and further studied.

The test and analysis of the cohesive strength and mortar surface resistance show that the test method in the laboratory should be as close to the actual project as possible, and it is necessary to further investigate the quantitative test method of the surface resistance of the polyphenyl granule mortar.

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