JP2019044163A5 - - Google Patents

Claims (10)

A thermoplastic resin containing a polyamide resin and / or a polyacetal resin,
A resin composition containing a cellulose whisker having a diameter of 450 nm or less, a cellulose fiber having a diameter of 450 nm or less, or a mixture thereof, cellulose (excluding modified cellulose obtained by neutralizing the cationic group of cationic cellulose) . It is a manufacturing method of
The first step of preparing a resin-cellulose dispersion containing a dispersion medium containing water as a main component, a thermoplastic resin and cellulose dispersed in the dispersion medium, and a surfactant .
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,
A method for producing a resin composition, which comprises the above in this order. The method for producing a resin composition according to claim 1, wherein the ratio of the thermoplastic resin in the resin composition is 50 to 99% by mass with respect to 100% by mass of the resin composition. The method for producing a resin composition according to claim 1 or 2 , wherein the thermoplastic resin is a polyamide resin. The method for producing a resin composition according to claim 3 , wherein the polyamide-based resin is polyamide 6, polyamide 6, 6, or a mixture thereof. Any of claims 1 to 4 , wherein in the first step, cellulose is dispersed in a dispersion medium to obtain a cellulose dispersion, and then the cellulose dispersion is added to a thermoplastic resin to obtain the resin cellulose dispersion. The method for producing a resin composition according to item 1. The method for producing a resin composition according to any one of claims 1 to 5 , wherein more than 50% by mass of the thermoplastic 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 6 , 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 7 , 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 8 , 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 9 , wherein the first to third steps are continuously carried out by an extruder.