Study on Application Performance of Acrylic Waterproof Emulsion Synthesized by Special Alcohol Ether Sodium Sulfate

Abstract: Emulsifiers can play a very important role in waterproof emulsions.

Keywords: Special alcohol ether sodium sulfate, JS waterproof emulsion, JS waterproof coating, acrylic emulsion

01 background

JS waterproof coating is an organic liquid composed of polyacrylate emulsion, EVA emulsion, styrene butadiene emulsion, etc.

Polymer emulsion is the main film-forming substance of waterproof coating, and it is the main factor that affects the performance of the coating.

Although the emulsifier has a small proportion in the emulsion, its influence is very large

02 Experimental part

Reagent raw materials

Styrene, butyl acrylate, methacrylic acid, acrylic acid, Huafeng; 2-Ethyl-hexyl acrylate (2-EHA), Aladdin; Acrylamide, industrial grade; Sodium persulfate, industrial grade; other monomers, industrial Grade; Dispersant, bactericide, 250HBR, industrial grade; 42.

Basic formula of waterproof emulsion:

In this article, the waterproof emulsion formula chooses 0.

Table 1: Basic formula of waterproof emulsion used for comparison in this test

Synthetic emulsion process:

1) Add the bottom emulsifier and deionized water into a 3L four-neck flask, stir and heat to 85°C

2) Take the 1~5% pre-emulsion monomer, add the initial initiator and wait for the temperature to rise to 83°C, timing for 15 minutes
.

3) Start the dripping, the dripping time is 4h-4.
5h, and the replenishing initiator is dripped at the same time.
After dripping, keep it for 2h and cool to 45℃ for post-treatment
.
Stir at a uniform speed throughout the reaction process
.

Basic performance of waterproof emulsion

Table 2: Basic indicators of polymerized emulsions with different emulsifier combinations

Remarks: LPS630+LPS3040 indicates that the emulsion polymerization emulsifier system uses the two emulsifiers, and the competing product 1+LPS3040 indicates that the emulsion polymerization emulsification system uses the two emulsifiers.

JSⅡ type waterproof coating formula

Table 3: JS-II type waterproof coating formula used in this test

Type II-performance test

Table 4 and 5: Performance comparison of JS-II type in this test

Remarks: Industrial requirements tensile strength ≥ 1.
8mPa, bonding strength ≥ 0.
7mPa, elongation at break ≥ 80%

According to the implementation standard GB/T 23445-2009, the coating film samples are prepared, and the performance tests are carried out after curing
.
The tensile strengths of emulsions A, B, and C are equivalent, and all meet the requirements of the national standard, and the tensile strength of the reference sample is the lowest
.
The elongation at break A is the highest and C is the lowest, indicating that the application of synthetic waterproof emulsion to LPS630 will increase the elongation at break in the II waterproof coating
.
Bond strength, A is better than C, and meets the requirements of national standards
.
Based on the above results, it is found that the LPS630 synthetic waterproof emulsion can increase the elongation at break of the second type waterproof coating while ensuring the tensile strength and bonding strength
.

JSⅢ type waterproof coating formula:

Table 6: JS-III type waterproof coating formula used in this test

Type III-performance test

Table 7, 8: Performance comparison of JS-III type in this test

Remarks: Industrial requirements tensile strength ≥ 1.
8mPa, bonding strength ≥ 1.
0mPa, elongation at break ≥ 30%

In accordance with the implementation standard GB/T 23445-2009, coating film sample preparation, maintenance, and performance testing are carried out
.
B (1 competing products) minimum tensile strength of synthetic water emulsion, the breaking elongation A and the bond strength similar
.
A comparison with C found that synthetic water emulsion breaking elongation has obvious advantages, the overall performance of the commercially available emulsion A similar emulsion, the breaking elongation ratio of C significantly improved
.
The bonding strength of emulsion B and emulsion C is less than 1.
0mPa, which does not meet the requirements of industrial performance
.
The comprehensive properties of A and C emulsion type III meet industrial requirements
.

Type II and Type III paint viscosity

Table 9, 10: Measure the mixed paint viscosity of the synthetic emulsion according to the above-mentioned II and III type waterproof coating formulations
.

Comparing the initial viscosity of the four emulsions of type II, it is found that the initial viscosity of emulsion C is relatively large, and the other three are equivalent, and the workability is poor
.
In Type III, Emulsion C directly exceeds the range, and Emulsion A and B have similar viscosities, which has advantages over the reference sample
.
It shows that the waterproof emulsion synthesized by the special alcohol ether sodium sulfate LPS630 anionic emulsifier has the initial viscosity performance, which can improve the practicality of downstream construction
.

03 Conclusion

1.
The emulsifier synthetic waterproof emulsion exhibits excellent elongation at break and improves elasticity while maintaining tensile strength and bonding strength in type II and III waterproof coatings
.

2.
The emulsifier synthetic waterproof emulsion can improve the initial viscosity of the waterproof coating and improve the construction adaptability
.

references

[1] Shen Chunlin Wan.
Polymer cement waterproof coating.
Beijing: Chemical Industry Press
.
2003.
15-16

［2］Liu Jinchun, Zhao Fei, Xiao Jianbin.
Solventless Polyurethane Elastic Waterproof Coating［J］.
Paint and Coatings Industry, China, 2003, 33(02).