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    Home > Coatings News > Paints and Coatings Market > Application of New High-efficiency Film Forming Auxiliaries in Architectural Coatings

    Application of New High-efficiency Film Forming Auxiliaries in Architectural Coatings

    • Last Update: 2021-04-18
    • Source: Internet
    • Author: User
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    Abstract: Evaluate the application of several new high-efficiency film-forming additives, dodecyl alcohol esters and hexadecyl alcohol esters in architectural coatings, and analyze the performance related to film formation, and discuss the new high-efficiency film-forming additives in architectural coatings importance.

    Keywords: film-forming additives; architectural coatings; high efficiency; new

    The film-forming quality of architectural coatings directly affects the performance of the paint film.


    Due to the special properties of polymer emulsions, the film-forming process is completely different from solvent-based coatings.
    Film-forming additives are actually added to latex paint to help polymer film-forming The high-boiling point solvent of high boiling point, due to its dissolving effect to soften the particle surface and increase the free volume of the paint film, so that it can be densely formed into a film under a small force, and it can volatilize at an appropriate speed after the film is formed.
    Achieve the mechanical and chemical properties of the paint film.


    As people pay more and more attention to environmental protection and the government's strict requirements on the emission of volatile organic compounds (VOCs), film-forming additives with high efficiency, clean taste and high boiling point are more and more favored by technicians.


    This article will evaluate several new film-forming aids, and compare and evaluate the mainstream film-forming aids dodecyl alcohol ester and hexadecyl alcohol ester, and comprehensively evaluate their performance in architectural coatings.


    01 Film-forming mechanism and classification of film-forming additives

    The film-forming materials of architectural coatings all have a higher glass transition temperature Tg, and in actual construction, the coatings are required to have a lower film-forming temperature.


    The addition of the film-forming assistant reduces the glass transition temperature, so that the polymer can form a film at room temperature.


    In the emulsion, the film-forming aid is adsorbed on the surface of the emulsion polymer, and the latex particles are softened due to the dissolution effect, so that the particles are easily deformed, and the film can be tightly formed under a small force.


    At the same time, more free volume is provided during the film forming process to allow the polymers to diffuse into a film, so that the higher Tg polymer can be added to the film forming aid to form a film at a lower temperature.


    At present, the common film-forming additives for architectural coatings are:

    1) Alcohol esters: the most commonly used traditional film-forming aids.


    Some have reproductive toxicity category b.


    2) Mixed esters: provide different gradients of volatilization rate, with high efficiency.

    3) Alcohol ethers: It is easy to affect the architectural coating system and has a relatively strong irritating odor.

    02 Application of new and efficient film-forming additives

    main ingreadient

    LOCA®, LOCA® TS and LOCA® A+, film-forming aids, Shengxinghang Chemical (Shanghai) Co.


    , Ltd.


    Experimental formula

    The formula of PVC base paint in 1# is shown in Table 1.

    According to the test results of emulsion MFT, the formula of 1# basic paint with different film-forming additives is shown in Table 2.

    The formula of 2# high PVC base paint is shown in Table 3.

    According to the test results of emulsion MFT, the formula of 2# base paint with different film-forming additives is shown in Table 4.



    testing method

    Minimum film forming temperature (MFFT): Refer to GB/T 9267-2008, apply on the instrument, use a 100μm wet film preparer to make a film, 20-25mm wide strips, wait for 2h to dry, and form a uniform film on one side.


    The paint film on the other side was whitish and cracked to determine the MFFT.


    Pendulum hardness: refer to GB/T 1730-2007, coating on the glass plate, using a 100μm wet film preparer to make the film, curing at 23±2℃, humidity 50±5%, and at 4H, 1d, Use Konig pendulum to test the hardness for 2d, 3d, 7d and 14d.

    Thermal storage stability: Refer to GB/T 6753.
    3-1986, store in an oven at 50°C for 28 days, and then take it out for performance tests such as viscosity and pH.

    Freeze-thaw stability: refer to GB/T 9268-2008, store at -5°C for 18 hours, and store at room temperature for 6 hours for 1 cycle.
    After 3 cycles, perform performance tests such as viscosity and pH.

    Scrubbing performance: refer to GB/T 9266-2009, on a non-asbestos fiber cement slab, use wire rods for 2 coats (120μm once, 80μm once), curing at 23±2℃, humidity 50±5% On the 7th, use 0.
    5% detergent powder solution as the scrubbing medium, scrub until the substrate is exposed, and perform parallel tests on the same sample using two samples.

    Color development: Add the color paste to the coating at 2% addition amount, scrape it on the black and white cardboard with a 100μm wire rod, bake at 70°C for 5min, cool for 1min, then scrape the film with a 100μm wire rod, and wait until the paint film is nearly dry Time refers to the research at 40, placed for 20 minutes under the conditions of 23 ± 2 ℃, 50 ± 5% humidity, measured with a colorimeter, after one day, then use the colorimeter to measure.

    Hiding power: refer to GB/T 23981.
    1-2019, scratch the black and white cardboard with a 100μm wire rod, cure for 1d under the conditions of 23±2℃ and humidity 50±5%, and then measure it with a colorimeter.

    Water whitening resistance: refer to GB/T 1733-1993, scratch the black and white cardboard with a 100μm wire rod, cure for 4H, 1d under the conditions of 23±2℃, humidity 50±5%, and then place 2/3 of the paint film After soaking in deionized water for 4 hours, take it out, soak dry with filter paper, visually inspect and record the paint film, and measure the L value with a colorimeter.

    Odor evaluation: evaluate the odor in the paint tank, the odor after thermal storage, the odor of construction, and the odor of the dry film.
    The blind test of no less than 20 people will be scored and forced to sort, and then use the method of data analysis.
    For data processing, 10 points are strong smell, 0 points are tasteless.

    03 Performance results and discussion

    Influence on emulsion film forming temperature (MFFT)

    Adding a film-forming aid can reduce the MFFT of the emulsion.
    The effectiveness of the film-forming aid is reflected in the film-forming efficiency of the latex particles.
    When the same amount of film-forming aid is added, the more the MFFT decreases, it means the film-forming aid The higher the film-forming efficiency of the agent, the film-forming efficiency of 13 kinds of emulsions was tested according to the T test method of MFF above.
    The amount of emulsion added is shown in Table 5, and the results are shown in Figure 1.
    The film-forming aids were evaluated in 13 kinds of emulsions.
    s efficiency.

    It can be seen from Figure 2 that the temperature reduction of different emulsions by the film-forming aid is different, and is related to the type of emulsion and the initial MFFT.
    Therefore, after the emulsion is selected, different amounts of the film-forming aid need to be added to perform the MFFT.
    Measure to confirm the most suitable addition amount of film-forming aids for the emulsion.

    In different emulsions, the efficiency trend of film-forming aids is the same.
    Compared with other film-forming aids, the film-forming aids with high efficiency have high efficiency in each emulsion.

    At the same time, it can be seen from Figure 2 that the efficiency of LOCA®, LOCA® TS and LOCA® A+ is higher than that of alcohol ester lauryl and hexadecyl alcohol, and the efficiency is as high as 30% or more.

    Effect on volatility-pendulum hardness

    The film-forming aids are mostly high-boiling organic mixtures with relatively large molecular weights, with slow migration speed and low volatilization rate.
    The evaporation rate of the film-forming aid in the paint film is detected by Konig pendulum.
    In the 1# formula, the hardness of different film-forming aids in the paint film is tested according to the above pendulum hardness test method.
    The results are shown in Figure 3.
    .

    It can be seen from Figure 3 that the volatilization efficiency of different film-forming aids is different, and there is no necessary relationship with their corresponding boiling points.
    Judging from the curing of the paint film for 1 day, the hardness of alcohol ester twelve increases the fastest and the volatility is relatively faster.
    Judging from the hardness of the paint film after curing for 7 days, the hardness of different film-forming aids is basically the same, which does not affect the application performance.

    The combination and softening of latex particles is a long-term process, and the drying of the paint film and the improvement of performance are also a slow process.
    In comparison, a slower volatilization rate can provide a longer free volume time, which helps the latex particles to further merge with each other.

    Effect on coating stability

    Although the addition amount of film-forming aids in latex paint is not large, it will still be affected by hydrolysis in the paint.
    According to the test methods of thermal storage stability and freeze-thaw stability, the effects of different film-forming additives on these two properties of the coating are shown in Table 6.

    It can be seen from Table 6 that the film forming aids evaluated do not affect the stability of the coating.

    Effect on scrub resistance

    ,,。,4。,7。

    4,,,。

    LOCA®,,60-70%。,PVC,。PVC50%。

    ,,。,。

    1#,,Clariant blue B2G 132CN0.
    85%,8。

    ,1#2#9。

    56,,。LOCA®LOCA® TS。

    ,132.
    32pa、≤250℃VOCs,。,,。GB/T 1733-1993。

    18,,4,24L,。,L,;L,。10。

    From the experimental results, the existing conventional environmentally friendly film-forming additives have little difference in early water resistance.
    A small amount of high-efficiency film-forming aids added in the formula can achieve good film-forming properties of the paint film, which is beneficial to improve the early water resistance.

    Effect on smell

    With the improvement of living standards, consumers have higher and higher requirements for the odor of architectural coatings, and the most important factors affecting the odor are emulsions, film-forming aids and PH regulators.
    After selecting a clean odor emulsion and organic amine, paints were made with different film-forming additives, and the odor in the tank, construction odor and paint film odor were evaluated according to the above-mentioned odor evaluation test method.
    The results are shown in Figure 5.

    It can be seen from Figure 5 that the odor of LOCA series products is relatively low, the odor of alcohol ester twelve is relatively large, and the odor of O alcohol ester sixteen formula is relatively low.

    04 Conclusion

    Film-forming additives are very important components in architectural coatings.
    Although their addition is not very large, they have a great effect on the film-forming process of the paint film and directly affect the performance of the paint film.
    As environmental protection requirements become higher and higher, national standards, industry standards and corporate standards are improving year by year, high-efficiency, low-odor and high-performance film-forming additives will be the main development direction in the future.

    Through the evaluation of the five film-forming aids of dodecyl alcohol ester, hexadecyl alcohol ester, LOCA®, LOCA® TS and LOCA® A+, it can be seen that the film-forming aids of the LOCA® series are effective and odorous.
    It is better than other film-forming additives.

    The LOCA® series of film-forming aids have high efficiency and versatility in different system formulations, which can save 30-50% of the amount of film-forming aids added, and reduce formulation costs.
    The LOCA® series can provide differentiated boiling points and The volatilization rate can meet the different requirements of architectural coating formulations, and it can also provide special solutions for different water-based coating systems.

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