Today's highlights
How to choose sealant in construction industry after resumption of construction?
2. Farewell to paper money! RMB ushers in a big upgrade!
Can China still grab oil under three low oil prices? The inventory will reach 3.5 million barrels per day.
How to choose sealant in construction industry after resumption of construction?
With the implementation of domestic epidemic prevention and control measures, the epidemic situation in most parts of the country has been well controlled, domestic enterprises have also ushered in a large area of resumption of work, and the resumption of work in the construction industry has also followed. Silicone sealant, as one of the key materials of building waterproof seal, is widely used in building waterproof seal. How to choose and use sealant after the construction unit returns to work will be the focus of this paper. 01. How to choose building sealant correctly? Generally speaking, most of the silicone sealant materials are named according to different application parts, such as silicone structural sealant for curtain wall, silicone weather resistant sealant for curtain wall, silicone sealant for stone, silicone sealant for daylighting roof, silicone sealant for concrete plate joints, silicone sealant for doors and windows, silicone sealant for hollow glass, etc. The following focuses on how to select different silicone sealant according to different application parts
1.1 curtain wall structure assembly
Building curtain wall usually consists of panel and supporting structure of curtain wall. In the curtain wall design of buildings with various curtain walls as external enclosure, silicone structural sealant must be used for flexible connection according to JGJ 102-2003 technical code for glass curtain wall engineering. The silicone structural sealant on this part must meet the national compulsory standard GB 16776-2005 silicone structural sealant for building, which needs to bear a variety of loads and ensure the long-term adhesion to the curtain wall panel, so as to avoid the risk of falling off of the curtain wall panel due to the problem of structural adhesive. Therefore, silicone structural sealant itself needs high strength, good toughness, which can ensure good mechanical properties and meet the requirements of design service life under the harsh conditions of high and low temperature, immersion and UV irradiation.
1.2 curtain wall joint sealing
The joints between curtain wall panels need silicone sealant for sealing. This type of sealant is called silicone weather resistant sealant. Although the weatherproof sealant for joint sealing does not need to bear all kinds of loads of curtain wall panel, it needs to bear the displacement caused by the deformation of the base material caused by the thermal expansion and cold contraction of the wind load with the change of temperature. It not only needs the sealant to have certain mechanical properties and bonding properties, but also needs the weatherproof sealant to have better displacement capacity. Silicone weatherproof sealant shall be classified into 20hm / LM, 25hm / LM, 35hm / LM and 50hm / LM according to GB / T 14683-2017 silicone and modified silicone building sealant. It is recommended to use 35 grade products for joint sealing of common glass curtain walls and aluminum panel curtain walls. In addition to the conventional types of curtain wall panels, stone special sealant is required for stone curtain wall panels to prevent curtain wall pollution; due to its special requirements, special sealant is required for daylighting roof joint sealing.
1.3 secondary sealing of hollow glass
Generally speaking, the following points should be considered in the selection of the second sealant for hollow glass: (1) the sealing performance of the edge; (2) the protection provided for the whole glass system; (3) the environment exposed by the second sealant during the use. In practical application, people will choose different sealant according to different application range. Silicone structural sealant is generally preferred for commercial building glass (glass curtain wall, structural glass, etc.), and silicone sealant or other types of sealant can be used for the sealing of hollow glass of doors and windows.
1.4 door and window assembly and joint sealing
The weatherproof and waterproof seal of doors and windows is a systematic project like curtain wall, including the seal between window frame and glass, the seal between outer wall and door frame and window frame, etc. The quality of silicone sealant is the direct influence factor of whether the energy-saving door and window system can play a role, and the high-quality silicone sealant products can maintain long-term adhesion, air tightness and water tightness in the service life, so as to ensure the energy conservation and environmental protection of green buildings.
Table of Executive Standards for all types of products
02. How to use silicone sealant correctly?
Silicone sealant industry has such a sentence "three materials, seven construction", the choice of materials is important, but the correct use also directly determines the waterproof effect of construction joints. Each type of sealant has different construction process, so it is necessary to strictly construct according to different construction process to ensure the sealant construction effect.
According to the curing type of sealant, the sealant can be divided into single component and two-component sealant according to the adhesion test, compatibility test and pollution test. According to different curing types, the sealant can be constructed in different ways. Before the construction of single component sealant, relevant bonding test, compatibility test, surface dry test, etc. shall be carried out, and then relevant gluing steps shall be carried out. The two-component sealant needs to ensure the uniformity of a and B components before construction, so as to ensure its bonding effect. The methods for testing the uniformity of mixing include butterfly test, pull-out test, bonding test, etc., and then the gluing process.
Butterfly test
Breaking test
03, conclusion
The selection of sealant and construction procedure of building system determine the use effect of the whole building, and the selection of sealant with quality and reputation guarantee is very important. Sibao technology has been established for more than 20 years. It not only has a full range of silicone products used in the construction industry, but also provides a full range of "one-stop service", which can provide customers with relevant detection methods and assist in relevant tests to ensure the use effect of curtain wall engineering.
2. Farewell to paper money! RMB ushers in a big upgrade! 1、 Come out at last! RMB is going to have an unprecedented upgrade!
Today, the news came that the central bank's digital RMB is about to land. In the pilot area of Suzhou, some people's wages will be paid in the form of digital currency.
Within this month, all district level organs, enterprises and institutions in Xiangcheng District of Suzhou, as well as the staff whose wages are distributed through the four state-owned banks of industrial and agricultural construction, will complete the installation of the central bank's digital currency (DC / EP) digital wallet. By May this year, 50% of their transportation subsidies will be paid in digital currency.
This is just the beginning. According to the plan, in the next two to three years, 30% to 50% of M0 will be replaced by the central bank's digital currency, basically realizing the nationwide promotion of the central bank's digital currency, and most of the ordinary cash use will be replaced.
So what will the central bank's digital currency look like? In the evening of April 14, a picture of the digital currency of the central bank tested in the account of the Agricultural Bank of China had been circulated on the Internet. According to the news, the digital currency of the central bank was tested in four pilot cities, namely Shenzhen, xiong'an, Chengdu and Suzhou.
From the screenshot of the digital currency wallet of the Agricultural Bank of China, the main functions displayed are basically similar to the daily payment and management functions of the bank's electronic account. For example, in the homepage of the digital currency wallet of the Agricultural Bank of China, there are four common functions: "scan code payment", "remittance", "collection and payment", "touch".
Yes, you are right. China's official digital currency is about to be born. It will be the first digital currency in the world anchored by the currency of a sovereign country.
Before long mobile phone mobile phone mobile will be able to use the central bank's digital currency. It is not like Alipay or WeChat payment. Behind it is a solid national credit support, and payment can be "offline". Without the Internet and mobile phone signals, the mobile phone and mobile phone will be able to complete a collision.
2、 The central bank's digital currency refers to the digital currency issued by the central government. Its functional attribute is exactly the same as that of paper money. It belongs to legal tender and has legal compensation, but is only a digital form.
In other words, all citizens cannot refuse to accept digital currency. From the perspective of legal power, its effectiveness and security are the highest.
And Alipay and WeChat pay the other three party Internet payment, which is the settlement of commercial bank deposit money, which belongs to the digitalization of M1 and M2 level. It does not have the legal effect of M0 level, and is even more unlikely to replace M0.
Some people must ask, why is the central bank still making such a digital currency in such a developed electronic means of payment, and accelerating its progress?
In addition to being more secure, in extreme conditions such as natural disasters, earthquakes and other situations without network, it can still be used like paper money. The central bank's digital currency may also have a big role, which is to seize the opportunity, guard against possible financial challenges launched by the United States, and ensure China's financial security.
You should know that there are not only one America in the world, but two "America". One is the visible United States, the other is the global and invisible dollar capital empire.
U.S. dollar hegemony has always been the lifeblood of the U.S. and a tool used by the U.S. to sanction other countries. This tool mainly has two hands, one is the U.S. dollar, and the other is its global currency settlement system swift. The initiative of these two tools is in the hands of the Americans.
Take the swift system as an example. It is a cross-border inter-bank communication and settlement system that covers more than 200 countries and regions around the world and connects more than 11000 financial institutions.
In this case, the U.S. cut off the swift channel of which country, which is equivalent to turning it into a financial Island, losing contact with the international financial market, and difficult to trade with other countries.
In the past few years, when the United States sanctioned Iran, it first banned Iran from using the U.S. dollar for trade settlement, and then Iran began to use the euro or Japanese yen for settlement, using the swift international settlement system. Unexpectedly, the United States cut off Iran's swift channel.
Europe, which wants to do business with Iran, has to start a new business and set up a Europe Iran settlement mechanism, instead!
What we can learn from the past, especially from the past, is that for China, the United States has to guard against this kind of financial challenge, although it is a small probability event.
For example, according to Reuters, the U.S. has planned to list Huawei in the "SDN". Once listed, the U.S. can remove Huawei from the U.S. banking system. Huawei's assets in the U.S. will be frozen. Huawei cannot trade with U.S. enterprises, and may not be able to use the U.S. financial system and settlement system
At that time, Huawei will not only be unable to do business in the United States, but also foreign banks are likely to refuse to contact Huawei on the list for fear of being implicated and being sanctioned by the United States, which is tantamount to "financial nuclear attack" for Huawei.
So how can China break the financial challenges of the United States, deter Americans from irresponsible promiscuity and better ensure China's financial security?
Central bank digital currency is one of the options.
As I said just now, an important hand in the US financial war is the swift clearing system, which is the center of the original gold settlement system.
The blockchain technology behind the digital currency is precisely decentralized. It can bypass this settlement system and jump out of the five finger mountain of the US financial system.
In this way, we can not only stop worrying about the financial neck tactics of the Americans, but also create a new track of digital currency to achieve transcendence.
3、 Of course, the issuance of digital currency will also greatly facilitate our trading behavior and promote our economic development.
To put it plainly,