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Urea Formaldehyde Adhesive

Thermosetting Resin Adhesive Article Contents: Thermosetting Resin Adhesive Melamine Formaldehyde Adhesives Urea Formaldehyde Adhesiv...

Tuesday, November 14, 2017

Many Kind Double Tape Trade Mark

There are many trade mark of double sided tape sold in the market. There are many quality about this double tape, and also sell in different price. For you that only use this double tape for home may no problem if use just small quantity but for many service company use this double tape for many purpose to help their work.

Some product trade mark and the price that sell on online shop in Indonesia possible to use of this double tape as follows:

Monotaro Double sided tape for genertal use: Price Rp. 15.900
Double tape Nachi 0.5 ich/12 mm x 10 Yard: Price Rp. 2.200
Double tape for paper Sazanami: Price Rp. 67.000
Double tape for paper Sazanami, 12 mm x 8 m: Price Rp. 1500
Double Tape for paper Sazanami 12 m: Price Rp. 47.000
Double tape 3M, 18 mm x 25 m: Price Rp. 140000
Double tape Nippon NT Foam PE: Price Rp. 7800
Double tape 3M VHB 1 roll 12 mm: Price Rp. 33000

Some Double tape trade mark that sold in Ebay online shop:
3M Double Tape: 4’’ x 8” per pack, price $3.99
3M Double Tape: 1/4 “ (6 mm), 6 ft long: Price $6.08
3M Double Tape: 1/2" (12 mm); Price $ 8.99
3M Double tape for paper 3 rolls: Price $6.99
3M Double tape 1” x 9 ft long: Price $10.95
Scoth Double tape, 5” x 250”: Price $4.28
Scoth Double sided tape 5 x 250 in: Price $11.50
Scoth Double sided tape 1/2“ x 500” – 6 rolls: Price $ 14.09
Double Sided Tape, made of Michigan, 2 in wide x 33 ft long, new trade mark, 2 rolls: Price $5.65
25M Red Film Transparent Double sided sticky adhesive tape for cell phone repair: Price $6.20
Genuine 3M VHB clear double sided tape 1/4 “, 5/16”, 7/16”, 1/2 “, 1”, 1.5”, 2 “ combine: Price $4.99

Thursday, November 2, 2017

Double Tape Adhesive Usage

Double tape adhesive usually use for office needed but actually double tape like 3M adhesive tape can use in several purpose because double tape have many different type and for different application. For example of double tape that use for other application as follows:

Advanced materials are making cars more fuel efficient, safer and easier to drive. The products used on those materials can help cars achieve peak performance. For more than 45 years, 3M’s automotive attachment tapes have evolved with the auto industry – resulting in adhesion technology renowned for strength, versatility and reliability by OEMs and consumers around the world.

big double tape
Big double tape can use for Industrial purpose or use in automotive work

In industrial usage, double tape sided is coated with glue in both sides, designed to stick two surface together. This double tape allow for neater looking projects and better craftsmanship, unlike screws or rivets, which join materials at single point. Use high strength double sided tape permanently adhered one substrate to another while spreading the stress load.

Double tape can use for floor protection when under construction. You need to cover surface of floor when under construction, people walkaway over the floor we can use floor boards or plywood to protect the surface. With double coated carpet tape feature an aggressive adhesive system that perfect for carpet hold down but will leave no residue when removed.

Double tape also can use in building installation. Double tape can help to hold temporarily any kind of material that will install in difficult location, then you can stick double tape there and stick the object then you can stick the object and tighten with bolt and nut.

See others:

How to Use UF Powder

Urea formaldehyde (UF) adhesives are available as either liquid resins or powder form. Both will produce similar glue line characteristics: strong, rigid, thermosetting, and excellent heat resistance.
Urea formaldehyde molding powder are preferred where production runs are infrequent, where the ambient temperature is high, and where longer storage life is needed. UF powder have a one-year shelf life. This are pre-formulated should be mixed with required fillers, hardener and catalyst to meet a wide range of process requirements.

Preparation of UF Adhesive Resin

To make urea resin from UF powder, use water necessary to reconstitute the powder resin. Amount of water is about 50-65% dry weight of the dry powder to be mixed.
  • Filled the container with 2/3 part of water needed to the mixing vessel.
  • Slowly add the powder with stirring motor with slow speed ( < 2,000 rpm) with a mechanical agitator.
  • Stirr continuously for about 5 minutes using a spatula to scrape powder from the sides back into the liquid. The mixture should be creamy and virtually lump-free at this point.
  • Add the remaining 1/3 water and mix for an additional minute. Mix should be smooth, creamy, and lump-free.
To use this UF paste to the surface of wood or plywood evenly and glued together both wood to make stick each other. Press both of wood and lets it on the press condition and let it dry. Urea formaldehyde is a termosetting resing that mean this resin can cured (hard) need time and temperature. Curing time can be faster if apply in higher temparature, but it can be longer if lets this ply in room temperature.

The required condition is as follows:
  • Solid wood glue-ups will require from 150 psi for low-density species up to 250 psi for high-density species.
  • Cold pressing panels at 70 °F will require from 4 hours press time on low density species to 6 hours on high density species. At 90 °F this range will be from 2 hours to 4 hours.

Friday, October 27, 2017

Wood to Metal Adhesive

Adhesion in the bonding of wood to metal can be improved by adding a quantity of a polyvinyl acetal, in particular, 10-20% polyvinyl butyral; some care in the selection of solvent may be required. Alternatively, a solution of polyvinyl butyral can be applied to the metal and the resorcinol glue to the wood. The important subject of mixed thermosetting and thermoplastic adhesives is dealt with separately under the heading two-polymer adhesives.

Where the gluing of non-porous materials is concerned, it is natural to be careful about using adhesives containing much solvent especially if both adherents are non-porous. However resorcinol resins are used with great success in bonding certain plastic materials, especially melamine decorative laminates. Good results have also been obtained in bonding nylon with a resorcinol/phenol glue-results not unrelated perhaps to the solubility of nylon in phenol. As an example, the tensile shear strength obtained in bonding nylon 6 (polycaprolactam) to itself an to beech are of the order of 1450 psi and 750 psi respectively.

Resorcinol resins adhere well to concrete and brickwork, but special precautions need to be taken with concrete to achieve best results; this is because the 'laitance' (the loosely-bound surface commonly present on ordinary concrete) may be torn away through shrinkage stresses created during the setting of the adhesive. The precautions against this should include adding filler to the resin to reduce contractions, and abrading the surface of the concrete to expose the aggregate. A better way is to prevent formation of the laitance by vibrating the wet-mix in the course of laying the concrete. In other building applications, gluing to brickwork is generally satisfactory. And in gluing asbestos cement, resorcinol glues are highly successful. With asbestos cement as with concrete it is wise to allow for the reduction in shuffling time that alkalinity of cement may cause or, alternatively, neutralize the surface by applying a dilute solution of an acid.

Cylized rubber is readily glued with a resorcinol resin, especially to wood. In gluing rubber and other non-porous materials to wood, it is best to use an alcoholic, rather than an aqueous solution. Alcohol is easily to vapor and will not make adhesive wet and difficult to cure.

An important application of a resorcinol resin, although one that is perhaps marginal for consideration here, is in improving the adhesion of rubber to rayon and other synthetic fibers in the manufacture of automobile tires, a mixed resorcinol resin and rubber latex adhesive being described wherein the non-acidity and water-solubility of the former permit compatibility with rubber latex.

Thursday, October 26, 2017

Wood to Metal and Wood to Wood Adhesives

There is a stronger case for using an epoxy resin for gluing wood to metal than wood to wood. For wood to wood gluing using wood glue or Urea formaldehyde resin, that already impregnated with certain hardener. Clearly a curing temperature of 40 oC is insufficient for diethylaminopropylamine.

Metal Gluing

The most important adhesives use bisphenol A epoxy resins if the gluing of metals. All the common metals (and probably all the uncommon ones) can be glued, some better than others. The structurally important metals such as aluminum and steel are, fortunately, easy to bond; copper and lead are not so easy. In most cases, however, it is not the metal itself, but some oxide or other substance to which the bond is actually made.

By far the greatest amount of information that has been published deals with the adhesive strength on aluminum alloys.

Copper was the chief subject of study in one paper dealing with the effect of heat on epoxy adhesives, and it was shown that with the type of test used, the strength on copper was only about half that on aluminum.

The bond strength on aluminum including example of relationship to temperature, has been shown in earlier section dealing with hardeners.

The bonding of metal to metal in the manufacture of aircraft is the most spectacular use over made of an adhesive and still a source of some wonder. In the operation of aircraft sharp extremes of temperature may be met, extremes that can nowadays vary between -50 oC and more than 100 oC in few minutes. And whilst a constant strength within these extremes may not be demanded, something approaching it is expected.

In some operations associated with missiles, resistance to extreme cold is more important than resistance to heat. The behavior of an epoxy adhesive has been studied at – 253  oC; at this temperature three systems, one a nylon filled epoxy polyamide, and another a fluorocarbonepoxy polyamine composition have been stated to give food adhesive strength and toughness, (the third adhesive was a polyurethane).