JP2020063347A5 - - Google Patents

Claims (10)

A method for producing a resin composition containing a polyolefin resin, cellulose, and a surfactant.
The polyolefin-based resin contains an acid-modified polyolefin-based resin.
The cellulose is a cellulose fiber having a diameter of less than 1 μm, a cellulose whiskers having a diameter of less than 1 μm, or a mixture thereof.
The method is
The first step of preparing a resin-cellulose dispersion liquid containing a dispersion medium containing water as a main component and a polyolefin-based resin and cellulose dispersed in the dispersion medium.
A second step of heating the resin-cellulose dispersion while stirring to remove the dispersion medium to obtain a resin-cellulose mixture.
A third step of melt-kneading the resin-cellulose mixture obtained in the second step to obtain a resin composition,
In this order,
A method for producing a resin composition, wherein the second and third steps are carried out with an extruder. The method for producing a resin composition according to claim 1, wherein the ratio of the polyolefin-based resin in the resin composition is 50 to 99% by mass with respect to 100% by mass of the resin composition. The resin composition according to claim 1 or 2, wherein the polyolefin-based resin is at least one selected from polyethylene, polypropylene, a copolymer of ethylene and α-olefin, an ethylene-propylene terpolymer, and a mixture thereof. How to make things. The resin according to any one of claims 1 to 3, wherein in the first step, a cellulose dispersion liquid in which cellulose is dispersed in a dispersion medium in advance is added to a polyolefin-based resin to obtain the resin cellulose dispersion liquid. Method for producing the composition. The method for producing a resin composition according to any one of claims 1 to 4, wherein more than 50% by mass of the polyolefin-based resin combined with cellulose in the first step is in the form of pellets. The method for producing a resin composition according to any one of claims 1 to 5, wherein the proportion of cellulose in 100% by mass of the resin cellulose dispersion obtained in the first step is 1 to 30% by mass. The method for producing a resin composition according to any one of claims 1 to 6, wherein the temperature of the second step is 100 ° C. or higher and lower than 200 ° C. The method for producing a resin composition according to any one of claims 1 to 7, wherein at least a part of the third step is carried out in a reduced pressure state of less than atmospheric pressure. The method for producing a resin composition according to any one of claims 1 to 8, wherein the first to third steps are continuously carried out by the extruder. The resin composition according to any one of claims 1 to 9, wherein the extruder is a twin-screw extruder having an L / D of 40 or more obtained by dividing the cylinder length (L) by the screw diameter (D). Production method.