FAQ on polyurethane foam sealant

1. What is polyurethane foam filler? And major USES.

The full name of polyurethane foam filler is single-component polyurethane foam caulking agent, commonly known as foaming agent or foam adhesive, high viscosity is polyurethane foam adhesive; Single-component polyurethane foam (OCF) is the product of the cross combination of aerosol technology and polyurethane foam technology. When the material is ejected from the aerosol tank, the foamed polyurethane material will rapidly expand and solidify with the moisture in the air or the contact matrix to form a foam. The cured OCF foam has many functions such as caulking, bonding, sealing, heat insulation, sound absorption and waterproof, etc. It is an environmental protection and energy-saving building material with convenient use, suitable for sealing and sealing, caulking, fixing and bonding, heat preservation and sound insulation, especially for sealing and waterproof between plastic steel or aluminum alloy doors and Windows and walls.

2. The price of the same 750ML product on the foaming agent market is different, and the price of the same weight is also different. How to judge its quality and how to choose the product with lower price that can meet its own requirements?

However, many consumers, including dealers, have not been able to understand one problem. In fact, the foaming agent industry is based on gross weight. Generally speaking, the volume of foaming agents in 500ML is 300 grams, 330 grams and 380 grams. 750ML has 500g, 550g, 600g, 650g, 750g, 800g, 900g, 930g, etc., so we must ask how much it is when we buy it, so as not to make some dealers charge more than they need. The choose and buy, for dealers, to see their own model is wholesale distribution is given priority to, or terminal Windows and doors factory and engineering is given priority to, if is a wholesale distribution is given priority to, can choose some mid-range products, prices are relatively have a definite advantage, if is doing in terminal Windows and doors factory or engineering is given priority to, so we suggest big grams, expansion ratio is high, the relatively high cost performance products. (for example, no. 1 and no. 2 of shuo DE company in Shanghai) if they are only used for ordinary caulking, it is ok to choose ordinary products)

3, what kind of foaming agent is a good foaming agent?

Generally speaking, there are several criteria to judge the quality of a foaming agent:

1) adhesion. Some of the smaller foamed plastic hit in the vertical gap will flow down, not a good bonding effect.

2) foaming capacity. Good foaming agent foaming multiple is higher, can greatly save costs. For example, the foaming capacity of dream n o.1 produced by Shanghai shuo DE company is equal to that of general foaming agent, which is 900 grams. Dream no. 2 950 grams can produce about 32 meters, the price of one bottle, the quantity of two bottles)

3) the delicacy of bubble hole. Good foamed plastic curing bubble hole is very uniform and delicate, good stability, no powder. The second foamed rubber bubble hole is larger, after curing inside is empty even, the bearing capacity is poor, with the hand after pinching powder.

4) elastic. Good foaming agent after curing elasticity is very good, can withstand a lot of force on it, secondary product elasticity is poor, after curing with a pinch into a piece of paper.

5) contractility. All foaming agents will shrink, especially in the air temperature is very high, humidity is not enough, but this has a degree, good foaming agent contraction is small, the installation of doors and Windows has no impact, the second foaming agent contraction is larger, and even damage doors and Windows, especially high-grade wooden doors, the loss is larger.

(the dreamno. 1 and no. 2 produced by Shanghai shuo DE company have been proved to have smaller shrinkage after a lot of engineering tests, especially the effect of special wooden door is better, and we have cooperated with many famous domestic wooden door factories. The Olympic venues in Beijing are using this product.)

6. Problems, causes and solutions that may occur during the use of foaming agent.

1) no typing. Foaming agent as long as you can shake it can play, play, if there can be shaking but can't play or can't finish the situation, there may be the following reasons are three: (1) foaming gun is not assembled in place, the valve is not opened, forcibly tighten the foaming gun, open the valve. (2) foam gun muzzle, adapter or gun plug. To immediately clean up, can be used to check whether the cleaning agent is unobstructed (unobstructed, the jet cleaning agent smooth and powerful); Or directly replace the new foam gun. (3) foaming agent valve appeared "valve" phenomenon, may be caused by a long time inverted. Can be the first can be removed, is placed after 5 minutes with a 4*30 nails inserted into the valve, with a hammer gently hit the nail, after hearing the sound of ventilation immediately installed gun can be used, it is recommended to use up immediately. A can of product zui is well used up at one time. If it is true that it is not used up and the gun does not leak air, it can be placed for one week without unloading the gun and tightening the adjusting screw behind the foam gun. If the air tightness of the gun is not good, you must remove the canister, cleaning foam gun; Half a tank of product is treated as "knot valve", but it is possible that the valve is not tightly reset, and air leakage occurs and solidifies. Non-standard foaming gun may not match with the foaming agent accessories system, which will lead to the valve not open or not fully open, showing that the rubber or rubber pressure is insufficient; Cleaning agent solubility is not enough, foam gun is difficult to clean, will use glue is not smooth. It is suggested to use standard foaming gun and cleaning agent of shuo DE company.

2) contract. There are a lot of customers because of the use of poor quality products and lead to high-grade wooden door contraction compensation after the use of our company's products, most are greedy small cheap, the real wooden door recommended the use of special foaming agent (such as Shanghai shuo the company's development and production of wooden door 1 and 2, shrinkage is very small, adhesion is very good).

3) make it look like water. Because workers in the production process of one less filling of raw materials and no foam, the general probability is very small, this situation will be replaced by manufacturers.

5. Construction conditions of foaming agent.

1) feed tank temperature 5℃ ~ 35℃;

2) environmental humidity greater than 45%RH;

3) the construction surface shall be clean, grease-free and sand-free. It may be sprayed with water mist and wet, but there shall be no standing water;

4) the bonding surface should not be teflon or silicone.

6. What kind of foaming agent is qualified?

1) the use date is within the shelf life of the product;

2) product appearance is clean and various labels are clear;

3) no glue leakage of the valve;

4) the jar is not damaged or missing;

5) inside the liquid plastic capacity, must be able to shake, do not have thick phenomenon.

7. Matters needing attention in the construction process of foaming agent.

1) filling amount: the foaming agent has a certain after-effect to ensure the gap is fully filled, so there is no need to fill the gap. The amount of filling depends on the product and usually only needs to fill half of the gap.

2) filling method: the vertical gap should be filled from bottom to top, horizontally or slightly downward, to avoid the foam flowing down from upside down; The horizontal gap should be filled from left to right with the head of the gun down or slightly, of course, there may be differences in personal operation habits; The filling of extra-large gaps should not be done at one time. The construction should be done in several times. The second construction should be done after the last foam filling is stable.

3) when filling a closed space, ensure that there is enough moisture in the cavity and work in batches.

4) it is recommended that a single can of foaming agent be used up in one time. If there are residual materials in the tank after the construction, the foaming gun can be left on the material tank, and the flow regulating valve can be closed, so that the material tank can stand in the shade and be available the next day.

5) in the process of construction, if there is material spill on the clothes, can be scraped clean, clean with cleaning agent; Or when the foam dries, peel it off by hand. Spray on the skin should immediately dry with cloth, and then wash with soap, or with a cleaning agent.

6) construction personnel are not allowed to smoke during construction; Products are not allowed to be near open fires, used up empty cans are not allowed to burn or puncture, and children are not allowed to play.

8. Specific operation methods of foaming agent during use.

Gun products:

1) take a polyurethane foaming gun and clean it with polyurethane cleaning agent to ensure smooth flow; Take a bottle of foaming agent, hold the middle part of the tank with your hand, and shake it vigorously along the transverse direction of the tank for at least 20 times, making sure that the prepolymer in the tank is fully mixed;

2) remove the protective cover of the valve on the thread ring of foaming agent, remove the cleaning agent from the foaming gun, and install the body of foaming agent tank onto the interface of the foaming gun along the thread;

3) hold the foam gun to ensure that the material can is placed above and the foam gun is below the material can. Open the flow regulating valve at the back of the foam gun;

4) aim the gun head at the bottom or inside of the object to be filled, gently pull the lever and start the construction. Can be adjusted to the appropriate flow through the flow regulating valve behind the foam gun. After a can of spray, if you want to fill, can immediately remove the empty tank, according to the method of the third point to reinstall the foaming agent, continue the construction, the interval should not be too long.

5) after the completion of construction, remove the material can and replace it with a special cleaning agent to clean the foaming gun, so as to avoid the residual material curing and blocking the foaming gun.

6) the pipe type product is used in accordance with the gun type product. It does not need to use foam gun for its use. It only needs to use the pipe with the can for one time, which is convenient and quick.

9. What is pre-foaming and post-foaming? What's the difference?

The so-called before foaming, that is, after the foaming agent ejecting 80% has foaming, behind the foaming range is very small, so that workers in the use of foaming gun can be very good grasp of the hand strength, simple and convenient and do not waste glue, greatly saving the cost. After the foam is the rubber spout gradually thickened than when playing out several times, so it is difficult to let workers grasp the hand button lever strength, easy to waste glue, zui less waste 1/3, in addition after the expansion of the glue after curing easy to squeeze bad doors and Windows. (for example, no. 1 and no. 2 are pre-foaming products created and produced by Shanghai shuo DE company, which greatly saves the cost for the majority of users)