Some different opinions on foaming during putty co

Several different opinions on foaming during putty construction

several different opinions on foaming during putty construction

March 2, 2020

Hello, friends and colleagues

my name is "glue king". I joined the industry in 2000. So far, it has been 19 years. Because I have a glue production workshop, a dry powder coating production workshop, and later added a raw material and various additives production workshop, I have personally touched, crawled and rolled for many years, "I have developed a fighting ability, and some friends in the industry joked that I am a small strong man who can't fight to death. It sounds funny and bitter to think of it". Maybe it's because of the problem of professional habits, most people tend to focus on what topics they like in what industry they do. Of course, I'm no exception. Today, I want to talk about the "big mountain": in this era of surging Internet traffic, their respective media platforms, official account, circles of friends, etc, It has become the main battlefield of information resources dissemination and public opinion evaluation; A good sharing of information resources can benefit the vast majority of industry groups. If a technical popular science article is written by a person who has no actual experience, the content depends on Baidu search for a little truth and some taken for granted subjective reasoning logic. This form of technical popular science article is superficial and lacks the real technical core, and is used as a tool carrier to attract click through rate and browsing volume by those we media platforms who do not understand technology, It is regarded as a treasure by those colleagues who have encountered the same product problems and failed to solve them. This article is most prominent in the analysis of blistering in the construction of popular science putty

echoing others and spreading false information subverts the objective facts.

there are many articles about bubbles during the construction and scraping of dry powder putty, and there are also many causes and improvement methods for its popularization and analysis. I have seen various forums and we media platforms, official account, including views and opinions in the circle of friends. The content is mostly similar, and many soft articles that change soup but not medicine are theoretical reasoning explanation and analysis, Few people can analyze it with their own practical experience; Many writers of articles about foaming in putty construction estimate that they don't even know how to take the scraper and shovel used for puttying. How persuasive do you think the "technical post" written by such people can be? From the beginning, this kind of soft text forwarding that changes soup without changing medicine has evolved into erroneous transmission, from echoing others to almost subverting the objective reality and evolving into the current vulgar agreement. In a word, the difference between theoretical speculation and scientific practice is not generally large, but very large

personally, I feel that the main factors for bubbles during putty construction are poor water locking property of putty and unscientific design of structural force of putty formula; It is not the fallacies we usually see in the soft text that the wall is too dry and needs watering, the compactness of the base surface is too large or too small, the sand hole of the base surface is too large, the swing speed is too fast, the thickness of one-time scraping is more than 2.0mm, the temperature is too high, and the water vapor transformation is too fast, etc; Whenever someone in the industry group asks about the reasons for the blistering of putty and how to solve it, there will always be several "activists" who will take this kind of soft text as a magic weapon to solve the problem for people to compare. However, after reading the content of those soft texts, it is not only useless at all, but you should also thank Zadeh constantly and say thank you to him. Those who have been in the industry for a long time can pay attention to observe:

I Since those soft words have already found the cause and given good solutions and suggestions, the birth of the dry powder putty industry has lasted for nearly 20 years. Why is blistering still called "common industry disease" by the industry? Who solved the blistering problem by reading the soft text

second, since the base surfaces summarized and analyzed in the soft article will inevitably blister, how can it stop blistering after changing the putty of big brands

third, through the above two points, it is not difficult for smart people to imagine that the foaming problem of putty construction, the base surface environment is not an inevitable factor (but it does not absolutely rule out the related coating)

suit the remedy to the case "common industry disease" is also a disease, not an incurable disease

in our Chinese dictionary, there is an idiom called: suit the remedy to the case. Since the foaming problem of putty construction is called "common industry disease" by the industry, then the common disease is also a disease. In my personal understanding, the "common disease" of a product is only an incurable disease like technology to be tackled, not cancer. In the development process of China's manufacturing industry, Our "made in China" is from immature to mature, and coating products are no exception; As a manufacturing enterprise, or as a technical R & D personnel, if you really push out the technical problems encountered by those raw material suppliers or "half barrel of water" technicians as "common problems in the industry", it is extremely irresponsible for yourself and should not be. Only by facing the difficulties and constantly studying and exploring, can you break through the stagnant status quo

how to treat symptoms? How to apply the medicine? However, if the blistering phenomenon during putty construction is described as a "common problem in the industry", it can be concluded that he has not dug out the crux at all, and there is no way to prescribe drugs without finding the cause. Without drugs, the disease will still exist, just like a sick biological chain will not have perfect continuity. When an excellent enterprise or an excellent engineer encounters the bottleneck of product technology, They will overcome bottlenecks with a positive attitude rather than a negative "common industry disease" as a perfunctory statement

is the technology of "low-end products" really low-end

when we talk in groups, someone will come up with a sentence from time to time: putty, mortar and dry powder coatings are low-end products with little technical content. For many years, this sentence has been misinterpreted by most people in the industry. Some people casually say it or write it casually. We don't look at some raw material suppliers under the guise of "putty nuclear technology", Don't listen to those words that appear from time to time that "low-end products have little technical content" and don't need to be taken on; Neutral: any paint product has its core technology. The core technology referred here is not understood as having super strong, super deterrence and killing ability like the research and development of nuclear weapons, but a synonym for the product's cost performance, scientific ingredients, proportioning balance and technical focus

if the meaning of the so-called "low-end products" is correctly understood, it should mean that such products have low added value and low threshold for entry into the industry, rather than their low technical content; There is no harm without comparison. In the industry of our coating products, there are stronger and bigger enterprises in every region, that is, the leading enterprises we often say. Whether it is high-end or low-end, others have achieved the quality and performance that you can't do in terms of product performance. Isn't this the so-called technical content? It is also dry powder putty. Why are brand putty such as biyou, Meichao, Nippon, sankeshu and Dulux recognized and accepted by the market soon? In addition to their strong economic strength and good marketing planning, can you say that their dry powder putty has no technical content

dry powder putty was born on the basis of the theory of glue putty. It has been developing for more than 20 years. It is considered by the industry to be the most low-end product, and the product with the least technical content is the product with the most prominent problems, such as foaming during scraping, shelling during grinding, powdering after grinding, peeling after painting, shelling after spraying real stone paint, yellowing after putty scraping Many problems such as lack of adhesion between layers have plagued a large number of putty production enterprises for a long time. If you say that putty products are low-end products with no technical content, I am the first one to refuse to listen. Why have putty products developed for so many years, and most enterprises have been unable to break through the technical bottleneck? Will you even say that this is a "common problem in the industry"? Why can't we easily solve the monotonous discussion about the technical problems of putty in the process of group chat? As far as I know, the probability of putty problems accounts for the highest proportion of other paint problems

don't find the crux, talk about the right remedy

this is a reply I saw from an industry enthusiast on other forums about the foaming of putty Construction: "the foaming of putty construction is generally divided into two categories, one is the" crater "with exposed bottom, and the other is the bubble without exposed bottom. The bubble with exposed bottom is caused by the gas emission after the wall absorbs water, showing a" crater "shape, Bubbles that do not show the bottom are that the putty itself contains pores during the mixing process of adding water, and many bubbles will be generated on the base surface of the putty during scraping "

quoting his analysis is not that I want to deliberately crack down on his enthusiasm, but that I have different views on it. Personally, I think that as a technical discussion, we should not only have a tit for tat spirit of being more serious, but also have a good attitude towards things rather than people. I don't agree with the two kinds of phenomena and causes he analyzed above

in the first category, he said that the exposed "crater" shape was caused by the gas emission after the wall absorbed water. I want to ask: how much air pressure can the wall emit when the wall absorbs water from the putty? Can the putty be flushed and turned over in a "crater" shape? What I want to emphasize here is that putty bubbles are usually divided into physical bubbles and chemical bubbles. The so-called physical bubbles generally refer to that when the wall absorbs the moisture of putty, gas is discharged from the wall, and the thinned putty will be broken by the gas to form a pinhole or sunken pit base surface, and the base surface can be backfilled and leveled by swinging it back and forth with a scraper for several times, Generally, when scraping putty bubbles with a thickness of about 2.0mm, they can't break the bubbles at that time. Instead, the putty base surface is jacked up into an empty drum shape (it's another matter that the putty is too thin and the moisture is too large). The "crater" phenomenon usually doesn't belong to the formation of physical bubbles, but to the category of chemical bubbles. The so-called chemical bubbles are like the process of steaming steamed bread with flour and baking powder. Are all the fermented flour spread out with a knife in a "crater" shape? It does not need the wall to absorb its water, and there is no sharp external cause of gas. As long as it is spread out, there will be a "crater", which is a factor of chemical fermentation; After the putty powder is added with excessive bentonite (expansibility), starch ether (fermentability) and other chemicals, there is naturally a "crater", but it can be flattened after being pressed back and forth with a scraper for several times

in the second category, he said that during the mixing of putty powder with water, there will be air formation in the putty paste. We do not rule out the air entrainment of cellulose at the moment when it is dissolved by water, but the air entrainment of cellulose is very small. Most of the pores in the putty paste are formed by the chemical fermentation principle of greasy additives. On the premise that the additives are not excessive, the slight expansion pores in the paste can improve the thixotropy of putty, It is conducive to the ease and fluency of batch scraping. The slight pores of the paste will not cause batch scraping blistering, because the tiny pores have long been flattened after the scraper swings and squeezes back and forth

friendship guest, many people, great power

the following is a chat record of his experimental opinions on the causes of bubbles in putty construction, commissioned by a friend in 2015. Let me post it here for him, and I'll press