When these are mass-produced, it may not be long before they will be used in building materials and automotive parts. What is not to be missed here is flame retardancy.
For example, the above polypropylene burns well. Cellulose nanofibers basically burn, too. surely.
Then it can be said that these composite resins burn well.

I think flame retardancy will be an important theme in the future when applying cellulose nanofibers to automobiles and railways.
Is a flame retardant added to the PP side or a flame retardant to the CNF side? Or should we put an effective flame retardant in both at the same time?

CNF is also attracting attention as an environmentally friendly material, so you will not add halogen flame retardants. Then, phosphorus-based, aluminum hydroxide, magnesium hydroxide, antimony, etc. can be mentioned, but it is not known how effective.
It is thought that boric acid, which is mainly used as a wood flame retardant, is effective for cellulose nanofibers. However, there are many types of boric acid, so I think that boric acid alone is not very effective. Isn’t boric acid based flame retardant that is distributed as a flame retardant well applied?

Any water-soluble flame retardant that is easily soluble in water will work well with CNF.

• Added May 2017
  We received a sample from a certain company, so we applied a flame retardant mixture of cellulose nanofiber and soufa to a PP plate and performed a 45 ° C combustion test.
  The material treated to impart hydrophilicity was able to withstand the test for 5 minutes without penetrating because the flame retardant remained uniformly on the surface.
  It is a material that has not been verified yet, but we want to keep an eye on it in the future.

The post Is there a starlight PMC cellulose nanofiber issue? first appeared on SOUFA INC.Boric acid flameretardant& Termiticide.

Base material: Polypropylene plate (PP plate) ignition point 300-400 ℃, melting point 160 ℃
Size: 200mm * 140mm * 1mm

CNF Water content 94.58

50 g of a 2 wt% CNF aqueous solution was generated, and about 13 g of bestboron was mixed to prepare a coating type flame retardant.
Although the color is white, it becomes a transparent coating film when completed. It has sufficient viscosity for coating operation.

This is applied by the following method.

However, since the wettability of the PP plate was low, the surface was modified by plasma treatment.

After coating, dry in a dry oven for 24 hours. The temperature was set at 75 ° C.

The photograph of the PP board after drying is shown.

The flame retardancy was evaluated using the 45 ° C combustion test method. This is a combustion test method in accordance with JIS L1091, in which a flame is applied for 5 minutes to evaluate the back surface temperature and the presence or absence of penetration.
The tester used was as follows.

The test results are shown below.

A fire layer was formed at the same time as the flame hit the surface of the PP plate, and the two layers of the carbonized layer formed afterwards could withstand a 5-minute combustion test by blocking the flame.

In a test conducted at the same time, starch was used instead of CNF. Here’s a similar effect, but with a different look.

The mechanism of flame retardance is shown below.

The post Flame retardation of cellulose nanofiber first appeared on SOUFA INC.Boric acid flameretardant& Termiticide.