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Polyurethane Manual
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Hot and humid environment composite processing for attention
When the environment is evident in the film when a hot and humid conditions of dry machining, a considerable number of complex color printing factory did not pay attention to this potential change, natural compound in the process of color printing quality problems arise more. So hot and humid weather, the complex process should pay attention to it?
A high temperature and humid weather of the dry composite of
Then dry compound is mostly used by two liquid reaction type of polyester, polyurethane adhesive. However, its performance generally and the choice of isocyanate, polyester polyol of molecular structure, degree of polymerization, functional groups and the mixing ratio and other conditions vary. Two liquid reaction is the end part of the hydroxyl polymer composition and molecular structure of the main agent containing isocyanate-based curing agent components from the cross-linking reaction, close together to form a higher degree of polyurethane. With different acid ester curing agent component has a strong activity with hydroxyl groups, amine material reacts with the polymer and the reaction rate than polyester, polyurethane reaction main agent for more than 10 times faster. Such as methanol, ethanol, water and other amine substances. This is also the most polyurethane adhesives manufacturers in the instruction manual for restrictions on water and esters reasons. Then dry lamination process, the humidity is high impact on the complex is in many aspects, such as:
1. Adhesives harden enough to keep after composite curing adhesive, resulting in lower peel strength;
2. Optical Alliance has slowed, reducing the tack of adhesive bonding, easy blistering caused by composite membrane;
3. High temperature cooking film bag, high-temperature cooking process in the phenomenon of broken bags increased;
4. Solvent evaporation is not complete, more complex film bags smell phenomenon;
5. Composites increased when the bubble gum set, composite membrane easy to spot from the white point and crystallization points, etc.;
6. Composite film hard crisp feel fat has increased.
2, hot and humid weather to note
Through this understanding, a hot and humid weather the impact of the dry compound with general understanding, then dry lamination process can be carried out in each process in the targeted control:
1. To control the various films, such as nylon, cellophane films easily absorb moisture, when the nylon wrinkle, then there may absorb moisture, so in case there is no complex complete with a metal foil or barrier of a good film to film wrapped on the shelves of dry conditions, avoid piling on the ground directly.
2. Must ethyl acetate solvent used in the water, the amount of alcohol is controlled as much as possible to buy the regular channels of solvent, and the airtight storage. Detection of moisture content of ethyl acetate, ethyl a way can be half and half mixture of toluene, ethyl ester to detect moisture content, such as the bottom drops and mixed white phenomena, it indicates that the moisture content of ethyl too high, fast water also can be an indicator to detect the water content.
3. The environment must be combined to control the exhaust fan placed in the room to enhance indoor air circulation, but do not get in front Compound Machine Blowing, and check the guide roll, roll on the composite roll, and whether the network drops, again with a dry towel.
4. In the preparation of binders, with the appropriate amount of reduction, with the distribution with the use, do not place too long, and preparation, to ensure the amount of curing agent to make it to the limit by as much as possible, may be appropriate to increase the dose cure (5-10%), the main agent and curing agent to increase the extent of crosslinking.
5. To change the parameters of composite aircraft, currently the most complex machines smaller outlet in the compound, the inlet air speed than the wind speed, causing the formation of high pressure within the drying tunnel, easy to make slower solvent evaporation from so that the composite film increased residual solvents.
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Has any air-conditioning contractors done a house with polyurethane foam?
I have a builder that is building a house that has spray foam in the walls and on the roof. I talked to the insulator and he said a rule of thumb is to use 1000 sq ft per ton, I can't use just a rule of thumb in need something solid. Does anybody know where to get info on how to run a load with this stuff? The newest edition of Manual J I have doesn't have anything in there about it. He can't give me any R-values on any of this because he says the values will be to low and it will look like I need to take out more BTUH. How am I supposed to do a job when I can't find any info about it.
http://www.rhhfoamsystems.com/specifications.php
click on the links. There are more contacts at bottom of page
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