JP2001206967A - Method for producing foam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a foam hardly causing pollution, mild to the environment and that can be called an ecological product. SOLUTION: This method for producing foam by adding a polyol-based solvent to a waste paper such as a newspaper, a magazine and a copying paper to provide a liquefied material, adding an isocyanate to an adjusted liquid obtained by adjusting the liquefied material with chemicals such as a foaming catalyst and a foam stabilizer, and stirring and mixing the resultant product to provide the objective foam comprises adding granulated waste paper to the adjusted liquid or the mixture of the adjusted liquid and the isocyanate as an extender so that the total weight of the waste paper and the extender of the granulated waste paper in the adjusted liquid or the mixture of the adjusted liquid and the isocyanate exceeds 1/2 of the weight of the total of the extender of the granulated waste paper, the adjusted liquid and the isocyanate, when adding the isocyanate to the adjusted liquid and stirring and mixing them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a foam decomposable by microorganisms in soil or water.

[0002]

2. Description of the Related Art For example, chemically synthesized products such as styrofoam and urethane foam have been mainly used as foams such as cushioning materials used for packaging and heat insulating materials and soundproofing materials used for building materials. Since there is a concern that the product may have an effect on environmental pollution, in recent years, a foam that is environmentally friendly has been desired.

Therefore, recently, a biodegradable foam made by mixing and stirring a liquefied product produced by reacting a biomass raw material such as wood flour or rice husk with a polyol solvent and an isocyanate has been expected. It has become.

[0004]

However, at present, the content of the biomass raw material in a liquefied product produced by reacting the biomass raw material with a solvent is usually in the range of 25 to 35%. When the mixture is stirred and foamed, the content of the biomass raw material in the foam, which is the final product, is reduced to 10 to 20%, and even if it is biodegradable, it may be reduced by microorganisms in soil or water. Since it usually takes a long time to be completely decomposed, it is difficult to say that it is an eco-friendly eco product (environmentally friendly product).

[0005] Incidentally, in order to be an eco-friendly eco-product, the content of the biomass raw material in the foam as a product must be at least 51% or more. When the content of the biomass raw material in the foam is 51% or more, the biodegradability is improved, and the foam is almost completely decomposed by microorganisms in soil or water in a short period of time.

However, it is impossible to increase the content of the biomass raw material in the product foam to 51% or more simply by increasing the biomass ratio during the liquefaction reaction.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for producing a foam which can be said to be an eco-friendly product excellent in biodegradability.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, at the stage of mixing and agitating the adjusted liquefied product and isocyanate to produce a foam, the biomass raw material specified It has been found that by adding as an extender, a foam as a product is compounded to enable a biomass ratio of 51% or more in the foam, and the present invention has been completed.

That is, according to the present invention, a liquefied product is prepared by adding a polyol solvent to waste paper such as newspaper, magazine, or copy paper.
In a method for producing a foam by adding isocyanate to a liquefied product prepared with a chemical such as a foaming catalyst and a foam stabilizer with respect to this liquefied product, and stirring and mixing the mixture, isocyanate is added to the above-described liquefied product and mixed with stirring. In this case, the used waste paper which has been granulated in the adjusted liquefied substance or the mixed liquid of the adjusted liquefied substance and the isocyanate is added as an extender, and at least the used paper in the adjusted liquefied substance or the mixed liquid of the adjusted liquefied substance and the isocyanate is used as the recycled paper which has been granulated. The combined weight of the extender made of recycled waste paper and the adjusted liquefied material and isocyanate is more than の of the total weight.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for producing a foam of the present invention will be specifically described with reference to embodiments.

First, a liquefied product is prepared by adding a polyol-based solvent to waste paper such as newsprint, magazine, copy paper, etc., and mixing and stirring to make a liquefied product. The liquefied product is treated with an agent such as a foaming catalyst or a foam stabilizer. Adjust to obtain an adjusted liquefied product. Next, the used waste paper which has been granulated is added to the adjusted liquid product thus obtained as an extender. In this case, at least the combined weight of the waste paper in the adjusted liquefied material and the extender made of the granulated waste paper,
An extender made of waste paper granulated so as to exceed 1/2 of the combined weight of the filler made of granulated waste paper, the adjusted liquefied product, and the isocyanate added to the adjusted liquefied product in the next step is added to the adjusted liquefied product. Thereafter, the isocyanate is added to the adjusted liquefied product containing the extender made of the granulated waste paper, and the mixture is stirred and mixed, and a foam is produced by the mixed stirring.

According to the method of the present invention, at the stage of adding a isocyanate to the adjusted liquefied material and mixing and stirring to produce a foam, the used liquefied material is added to the adjusted liquefied material as a filler, The combined weight of the used waste paper and the filler made of granulated waste paper was set to exceed 1/2 of the combined weight of the filler made of the granulated waste paper, the adjusted liquefied material, and the isocyanate. It is possible to form a foam having a biomass ratio of 51% or more by compounding with the used waste paper.

The foam obtained by the method of the present invention is, for example,
It can be used as a cushioning material used for packing and a heat insulating material and a soundproofing agent used for building materials.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, waste paper granulated in the adjusted liquefied material is added as an extender, but granulated waste paper may be added as a filler in a mixture of the adjusted liquefied material and isocyanate.

[0015]

As described in detail above, at the stage of adding a isocyanate to the adjusted liquefied substance and mixing and stirring to produce a foam, granulation is performed in the adjusted liquefied substance or the mixed liquid of the adjusted liquefied substance and the isocyanate. In addition to the filler made of recycled waste paper, the weight of the combined filler made of recycled waste paper and granulated waste paper in the adjusted liquefied material or the mixed liquid of the adjusted liquefied product and isocyanate is increased by the waste filler made of granulated waste paper. 1 of the combined weight of the
When the ratio exceeds / 2, the product foam can be compounded to make the biomass ratio 51% or more, and it is excellent in biodegradability that can be decomposed well in the natural environment. A foam that can be said to be obtained.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 4F072 AB03 AC01 AD43 AD56 AK03 AL01 AL17 4F074 AA02 AA78 AG20 CA11 DA24 DA32 DA33 4J002 AB02X CK02W 4J034 CA03 CB02 CB07 DA01 DB03 DB07 HA00 MA26 MA29 NA05 QC03 RA06 RA10 RA15

Claims (1)

[Claims] 1. A liquefied product is prepared by adding a polyol solvent to waste paper such as newsprint, magazine, copy paper, etc., and the liquefied product is adjusted to an adjusted liquefied product prepared with an agent such as a foaming catalyst or a foam stabilizer. In the method of producing a foam by adding and stirring, the isocyanate is added to the above-mentioned adjusted liquefied product, and when the mixture is stirred and mixed, the amount of waste paper granulated in the adjusted liquefied product or the mixed solution of the adjusted liquefied product and isocyanate is increased. Along with the addition as a material, at least the combined weight of the waste paper and the filler in the prepared liquefied material or the mixed liquid of the prepared liquefied material and the isocyanate, and the weight of the filler in the prepared liquid and the prepared liquefied material, A method for producing a foam, wherein the amount exceeds 1/2 of the total weight of the isocyanate.