JP6841464B1 - Polyolefin-based synthetic fiber non-woven fabric treatment agent, polyolefin-based synthetic fiber, and polyolefin-based synthetic fiber spunbonded non-woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preferably improve wettability to fibers constituting a non-woven fabric, and to preferably improve durable hydrophilicity of the non-woven fabric. SOLUTION: It contains at least one of the following first ether ester compound and the following second ether ester compound, and the following ester condensate. First ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid. Second ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monovalent fatty acid, and a compound having 4 carbon atoms A compound in which ~ 26 fatty acids are condensed. Ester condensate: A condensate having a structural unit formed of a hydroxycarboxylic acid having 6 to 22 carbon atoms having a hydroxy group and a carboxy group in the molecule and having a degree of condensation of 1 to 5. [Selection diagram] None

Description

The present invention relates to a treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber, a polyolefin-based synthetic fiber, and a spunbonded non-woven fabric made of a polyolefin-based synthetic fiber.

Generally, polyolefin-based synthetic fibers are used as raw material fibers for non-woven fabrics. For example, the non-woven fabric is produced by a spunbond method using a polyolefin-based synthetic fiber. The non-woven fabric produced by the spunbond method is called a spunbonded non-woven fabric. By applying an oil agent that functions as a treatment agent for non-woven fabric to the non-woven fabric, functions such as durability and hydrophilicity are imparted. Nonwoven fabrics with functions such as durability and hydrophilicity are used in a wide range of fields such as the field of protective materials, the field of medical care, and the field of civil engineering.

Patent Document 1 discloses a water permeability-imparting agent as a treatment agent for non-woven fabrics containing an alkylene oxide adduct of a multivalent active hydrogen compound. As a polyvalent active hydrogen compound, a compound in which a polyhydric alcohol having a valence of 3 to 6 and a fatty acid form a partial ester is disclosed.

International Publication No. 2016/121673

By the way, in order to impart a function to the non-woven fabric more effectively, it is necessary to apply the non-woven fabric treatment agent more uniformly to the fibers constituting the non-woven fabric. In order to apply the non-woven fabric treatment agent more uniformly, it is necessary to improve the wettability of the non-woven fabric treatment agent with respect to the fibers constituting the non-woven fabric. However, when the wettability of the non-woven fabric treatment agent is improved, the durable hydrophilicity of the non-woven fabric tends to decrease. Therefore, it is an issue to suitably improve both the wettability of the non-woven fabric treatment agent and the durable hydrophilicity of the non-woven fabric.

Polyolefins present invention has been made in view of these circumstances, and its object is to made it possible as well as wettability suitably enhanced for fibers constituting the nonwoven fabric, thereby suitably improving the durability hydrophilic nonwovens It is an object of the present invention to provide a treatment agent for a non-woven fabric made of a synthetic fiber. Further, the polyolefin synthetic fibers this polyolefin synthetic fiber nonwoven fabric treating agent is attached, to provide a polyolefin-based synthetic fiber nonwoven fabric treating agent adheres polyolefin synthetic fibers spunbonded nonwoven fabric.

The treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber for solving the above-mentioned problems is prepared by combining at least one of the following first ether ester compound and the following second ether ester compound and the following ester condensate. The gist is that it is contained.

First ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid.

Second ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid, and a compound having 4 carbon atoms. A compound in which ~ 26 fatty acids are condensed.

Ester condensate: A condensate having a structural unit formed of a hydroxycarboxylic acid having 6 to 22 carbon atoms having a hydroxy group and a carboxy group in the molecule and having a degree of condensation of 1 to 5.
The content ratio of the ester condensate of the polyolefin-based synthetic fiber nonwoven fabric treatment agent is preferably 0.01 to 20% by mass.

Assuming that the total content of the first ether ester compound, the second ether ester compound, and the ester condensate of the treatment agent for a non-woven fabric made of a polyolefin synthetic fiber is 100 parts by mass, the first ether It is preferable to contain at least one selected from the ester compound and the second ether ester compound in a proportion of 80 to 99.95 parts by mass and the ester condensate in a proportion of 0.05 to 20 parts by mass.

Regarding the treatment agent for non-woven fabrics made of polyolefin-based synthetic fibers , it is preferable that the hydroxycarboxylic acid is the one shown in Chemical formula 1 below.

(R1: Saturated hydrocarbon group having 4 to 12 carbon atoms or unsaturated hydrocarbon group having 4 to 12 carbon atoms ^{in Chemical formula 1.}

R ² : Hydrogen atom or saturated hydrocarbon group having 1 to 8 carbon atoms. )
Regarding the treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber ^{, it is preferable that R1 in Chemical formula 1} is a saturated hydrocarbon group having 8 to 10 carbon atoms or an unsaturated hydrocarbon group having 8 to 10 carbon atoms.

For the polyolefin-based synthetic fiber nonwoven fabric treating agent, R ² in the Formula 1 is preferably a saturated hydrocarbon group having 6 to 8 carbon atoms.
Regarding the treatment agent for non-woven fabrics made of polyolefin-based synthetic fibers , it is preferable that the ester condensate has a degree of condensation of 1 to 2 and has a cyclic molecular structure.

The gist of the polyolefin-based synthetic fiber for solving the above-mentioned problem is that the above-mentioned treatment agent for a non-woven fabric made of the polyolefin-based synthetic fiber is attached.
The gist of the spunbonded non-woven fabric made of polyolefin-based synthetic fiber for solving the above-mentioned problems is that the treatment agent for the non-woven fabric made of polyolefin-based synthetic fiber is attached.

According to the present invention, it is possible with wettability to fibers constituting the polyolefin-based synthetic fiber nonwoven fabric is suitably improved, thereby advantageously improving the durability hydrophilic polyolefin synthetic fibers non-woven fabric.

(First Embodiment)
A first embodiment in which a treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to the present invention (hereinafter, also simply referred to as a treatment agent) is embodied will be described.

The treatment agent of the present embodiment contains at least one of the following first ether ester compound and the following second ether ester compound, and the following ester condensate.
First ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid.

Second ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid, and a compound having 4 carbon atoms. A compound in which ~ 26 fatty acids are condensed.

Ester condensate: A condensate having a structural unit formed of a hydroxycarboxylic acid having 6 to 22 carbon atoms having a hydroxy group and a carboxy group in the molecule and having a degree of condensation of 1 to 5.
When the treating agent contains at least one of the first ether ester compound and the second ether ester compound and the ester condensate, a polyolefin-based synthetic fiber non-woven fabric is formed as described later. The wettability with respect to the constituent fibers is preferably improved. Further, the durable hydrophilicity of the polyolefin-based synthetic fiber non-woven fabric to which the treatment agent is attached can be suitably improved.

The polyhydric alcohol is not particularly limited, and may be an aliphatic polyhydric alcohol or an aromatic polyhydric alcohol. Further, the aliphatic polyhydric alcohol may be a saturated aliphatic or an unsaturated aliphatic.

Specific examples of the above-mentioned polyhydric alcohol include ethylene glycol, glycerin, sorbitan, trimethylolpropane and the like.
The above polyhydric alcohol may be used alone or in combination of two or more.

The monovalent fatty acid is not particularly limited, and may be a linear fatty acid or a branched fatty acid. Further, it may be a saturated fatty acid or an unsaturated fatty acid.
Specific examples of the monovalent fatty acid include 12-hydroxystearic acid, ricinoleic acid, lauric acid, stearic acid, oleic acid, pentanoic acid, octanoic acid and the like.

The monovalent fatty acid may be used alone or in combination of two or more.
Further, the ester compound of the polyhydric alcohol and the monohydric fatty acid may be a natural fat or oil. Specific examples of natural fats and oils include coconut oil, rapeseed oil, sunflower oil, soybean oil, castor oil, hardened castor oil, sesame oil, fish oil, beef tallow and the like.

The above natural fats and oils may be used alone or in combination of two or more.
Specific examples of the alkylene oxide having 2 to 4 carbon atoms include ethylene oxide, propylene oxide, butylene oxide and the like. Among these, ethylene oxide is preferable. The polymerization sequence is not particularly limited, and may be a random adduct or a block adduct.

The above-mentioned alkylene oxide having 2 to 4 carbon atoms may be used alone or in combination of two or more.
The number of moles of the alkylene oxide having 2 to 4 carbon atoms added is preferably 5 to 120 moles.

In the first ether ester compound and the second ether ester compound, the ester compounds may be the same or different. The alkylene oxide having 2 to 4 carbon atoms may be the same or different.

The fatty acid having 4 to 26 carbon atoms in the second ether ester compound is not particularly limited, and may be a linear fatty acid or a branched fatty acid. Further, it may be a saturated fatty acid or an unsaturated fatty acid.

Specific examples of fatty acids having 4 to 26 carbon atoms include lauric acid, oleic acid, stearic acid, octyl acid, behenic acid, maleic acid and the like.
The fatty acids having 4 to 26 carbon atoms may be used alone or in combination of two or more.

The hydroxycarboxylic acid having 6 to 22 carbon atoms, which is a constituent unit of the ester condensate, is preferably the one represented by Chemical formula 2 below.

(Formula 2 in R ^1: a saturated hydrocarbon group, or an unsaturated hydrocarbon group having 4 to 12 carbon atoms having 4 to 12 carbon atoms.

R ² : Hydrogen atom or saturated hydrocarbon group having 1 to 8 carbon atoms. )
Further, R ¹ in Chemical formula 2 is preferably a saturated hydrocarbon group having 8 to 10 carbon atoms or an unsaturated hydrocarbon group having 8 to 10 carbon atoms.

Further, R 2 in Chemical ^{formula 2} is preferably a saturated hydrocarbon group having 6 to 8 carbon atoms. When the number of carbon atoms of the saturated hydrocarbon group is within the above numerical range, the durable hydrophilicity of the polyolefin-based synthetic fiber non-woven fabric can be more preferably improved.

The ester condensate preferably has a degree of condensation of 1 to 2 and has a cyclic molecular structure.
The content ratio of the ester condensate in the treatment agent is not particularly limited. The content ratio of the ester condensate in the treatment agent is preferably 0.01 to 20% by mass.

The content ratio of the first ether ester compound, the second ether ester compound, and the ester condensate is not particularly limited. Assuming that the total content of the first ether ester compound, the second ether ester compound, and the ester condensate is 100 parts by mass, at least one selected from the first ether ester compound and the second ether ester compound. Is preferably contained in an amount of 80 to 99.95 parts by mass, and the ester condensate is preferably contained in a proportion of 0.05 to 20 parts by mass.

When the content ratios of the first ether ester compound, the second ether ester compound, and the ester condensate are within the above numerical ranges, the wettability with respect to the fibers constituting the non-woven fabric made of the polyolefin-based synthetic fiber becomes higher as described later. Preferably improved. In addition, the durable hydrophilicity of the polyolefin-based synthetic fiber non-woven fabric to which the treatment agent is attached can be more preferably improved.

The treatment agent may contain other components.
Specific examples of other components include ionic surfactants such as anionic surfactants, cationic surfactants, and amphoteric surfactants as amphoteric compounds, or nonionic surfactants, monovalent or polyhydric alcohols. , Fatty acid, fatty acid ester, wax compound, silicone compound and the like.

Examples of the ionic surfactant include a phosphate ester type ionic surfactant and a sulfonic acid ester type ionic surfactant. Specific examples of the phosphoric acid ester type ionic surfactant include lauryl phosphate potassium salt, butyl phosphate potassium salt and the like. Specific examples of the sulfonic acid ester-type ionic surfactant include an alkyl (12 to 16 carbon atoms) sodium sulfonic acid salt and the like.

Examples of the nonionic surfactant include a polyether type nonionic surfactant, an ether type nonionic surfactant, an ester type nonionic surfactant and the like. Specific examples of the ether-type nonionic surfactant include a compound in which 10 mol of ethylene oxide is added to 1 mol of lauryl alcohol, and a compound in which 120 mol of propylene oxide is added to 1 mol of pentaerythritol. Can be mentioned.

Specific examples of the ester-type nonionic surfactant include a compound obtained by adding 20 mol of ethylene oxide to 1 mol of stearic acid.
These other components may be used alone or in combination of two or more.

There is no particular limitation on the content ratio of other components. The content is preferably 1 to 30 parts by mass with respect to 100 parts by mass in total of the contents of the first ether ester compound, the second ether ester compound, and the ester condensate.

(Second Embodiment)
A second embodiment in which the polyolefin-based synthetic fiber and the polyolefin-based synthetic fiber spunbonded nonwoven fabric according to the present invention are embodied will be described. The treatment agent of the first embodiment is attached to the polyolefin-based synthetic fiber of the present embodiment.

Here, the polyolefin-based synthetic fiber means a synthetic fiber synthesized by using an olefin or an alkene as a monomer. Hereinafter, the polyolefin-based synthetic fiber is also simply referred to as a synthetic fiber.

Specific examples of synthetic fibers include polyethylene fibers, polypropylene fibers, and polybutene fibers. These may be used individually by 1 type, and may be used in combination of 2 or more type. Further, as the polypropylene-based fiber, a modified polypropylene fiber obtained by copolymerizing various monomers, a composite polypropylene fiber of polyethylene and polypropylene, or the like may be applied.

Further, a composite fiber having a core-sheath structure in which either or both of the core and the sheath are polyolefin fibers, for example, a polyethylene / polypropylene composite fiber having a polyethylene sheath and a polyethylene / polyester composite fiber. There may be.

The ratio of the treatment agent of the first embodiment to the synthetic fiber is not particularly limited, but it is preferable to attach the treatment agent (without solvent) to the synthetic fiber in an amount of 0.1 to 2% by mass. , 0.3 to 1.2% by mass, more preferably.

As a method for adhering the treatment agent to the synthetic fiber, for example, a known method, for example, a dipping method, a spray method, or a roller, is used by using the treatment agent of the first embodiment and an aqueous solution containing water or a further diluted aqueous solution. A method of adhering by a method, a guide lubrication method using a measuring pump, or the like can be applied.

Further, the polyolefin-based synthetic fiber spunbonded non-woven fabric according to the present invention (hereinafter, also simply referred to as non-woven fabric) is produced by the spunbond method.
The method for producing a non-woven fabric by the spunbond method preferably goes through the following steps 1 to 7.

Step 1: A raw material supply step of supplying a raw material resin for synthetic fibers to an extruder.
Step 2: A melting / extrusion process in which the raw material resin is heated in an extruder, melted, and extruded into a nozzle provided with a spinneret.

Step 3: A spinning / drawing step in which melt spinning is performed from a nozzle, and the melt-spun fibers are further drawn by using an ejector.
Step 4: A collecting / transporting step in which the fibers that have undergone the step 3 are collected on a conveyor to form a web, and the web is further conveyed by a conveyor.

Step 5: A fusion step in which the web that has undergone the step 4 is passed between a pair of heated rollers to fuse the fibers.
Step 6: Adhesion step of adhering the treatment agent of the first embodiment to the non-woven fabric formed through the step 5.

Step 7: A winding step of winding the non-woven fabric that has undergone the step 6 on a winding roller.
By going through the above steps, the non-woven fabric of the present embodiment can be manufactured.
According to the treatment agent of the first embodiment, the synthetic fiber of the second embodiment, and the non-woven fabric, the following effects can be obtained.

(1) The treatment agent of the first embodiment contains a predetermined ether ester compound and a predetermined ester condensate. Therefore, the wettability with respect to the polyolefin-based synthetic fiber is preferably improved.

(2) By adhering the treatment agent of the first embodiment, the durable hydrophilicity of the spunbonded non-woven fabric made of polyolefin-based synthetic fiber can be suitably improved.
The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

-In the second embodiment, the synthetic fiber to which the treatment agent is attached is a polyolefin-based synthetic fiber, but the present invention is not limited to this embodiment. The treatment agent may be attached to synthetic fibers other than polyolefin synthetic fibers. Examples of synthetic fibers other than polyolefin synthetic fibers include polyester fibers, polyamide fibers, polyacrylonitrile fibers, cellulose fibers, and lignin fibers. These fibers may be composite synthetic fibers composed of two or more kinds.

Specific examples of polyester fibers include polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polylactic acid, and composite polyester fibers containing these polyester resins. Can be mentioned. Further, examples of polyester fibers include modified polyester fibers such as basic or acidic dyeable polyester fibers, antistatic polyester fibers, and flame-retardant polyester fibers.

-Also, the non-woven fabric to which the treatment agent is attached is a spunbonded non-woven fabric, but the present invention is not limited to this embodiment. The treatment agent may be attached to a non-woven fabric other than the spun-bonded non-woven fabric. The non-woven fabric other than the spunbonded non-woven fabric means a non-woven fabric in which the web is formed by a method other than the spunbond method.

Examples of the web forming method other than the spunbond method include a dry method such as a card method and an airlaid method and a wet method such as a papermaking method when the raw material fiber is a short fiber. Further, when the raw material fiber is a long fiber, a melt blown method or a flash spinning method can be mentioned. Examples of the interfiber bonding method include a chemical bond method, a thermal bond method, a needle punch method, a spunlace method, and a stitch bond method.

-The treatment agent is a stabilizer, an antistatic agent, an antistatic agent, a binder, an antioxidant, an ultraviolet absorber, and an antifoaming agent for maintaining the quality of the treatment agent, as long as the effects of the present invention are not impaired. It may contain a component usually used for a treatment agent such as (silicone compound).

Hereinafter, examples and the like will be given in order to make the configuration and effects of the present invention more specific, but the present invention is not limited to these examples. In the following Examples and Comparative Examples,% means mass%.

Test Category 1 ( Preparation of Polyolefin Synthetic Fiber Nonwoven Fabric Treatment Agent)
(Examples 1 to 40 and Comparative Examples 1 to 7)
The first ether ester compounds (A1-1 to A1-10) shown in Tables 1 and 2 were prepared by the following methods. In A1-1 to A1-4 shown in Table 1, natural fats and oils were used as ester compounds of polyhydric alcohols and monohydric fatty acids.

In A1-1, 933 g (1 mol) of castor oil and 2 g of sodium hydroxide as a catalyst were added to the autoclave to replace the atmosphere with nitrogen gas, and then 4400 g (100 mol) of ethylene oxide was press-fitted to ether. The chemical reaction was carried out.

Next, 40 g of a known inorganic synthetic adsorbent was added to the liquid subjected to the etherification reaction, and the mixture was stirred at about 80 ° C. for 30 minutes. Then, it was transferred to a filter precoated with diatomaceous earth, and the inorganic synthetic adsorbent adsorbing the sodium hydroxide catalyst was removed to prepare A1-1. A1-2 to A1-4 were also prepared according to this method for synthesizing A1-1.

The type and number of moles of the ester compound and the type and number of moles of the alkylene oxide in the first ether ester compound are as shown in the "ester compound" column and the "alkylene oxide" column of Table 1.

As shown in Table 2, in A1-5, 62 g (1 mol) of ethylene glycol as a polyhydric alcohol and 600 g (2 mol) of 12-hydroxystearic acid as a monovalent fatty acid were charged into a reaction vessel and esterified. The reaction was carried out. The ester compound obtained by the esterification reaction and 2 g of potassium hydroxide as a catalyst were added to the autoclave to replace the atmosphere with nitrogen gas, and then 1408 g (32 mol) of ethylene oxide was press-fitted to carry out the etherification reaction. went.

Next, 17 g of a known inorganic synthetic adsorbent was added to the liquid subjected to the etherification reaction, and the mixture was stirred at about 80 ° C. for 30 minutes. Then, it was transferred to a filter precoated with diatomaceous earth, and the inorganic synthetic adsorbent adsorbing the potassium hydroxide catalyst was removed to prepare A1-5. A1-6 to A1-10 were also prepared according to this method for synthesizing A1-5.

The type and number of moles of the ester compound and the type and number of moles of the alkylene oxide in the first ether ester compound are as shown in the "ester compound" column and the "alkylene oxide" column of Table 2.

In addition, the second ether ester compounds (A2-1 to A2-20, Ra-1, Ra-2) shown in Tables 3 and 4 were prepared by the following methods. In A2-1 to A2-12 shown in Table 3, natural fats and oils were used as ester compounds of polyhydric alcohols and monohydric fatty acids.

In A2-1, 933 g (1 mol) of castor oil and 2 g of sodium hydroxide as a catalyst were added to the autoclave to replace the atmosphere with nitrogen gas, and then 660 g (15 mol) of ethylene oxide and 348 g of propylene oxide (15 mol). 6 mol) was press-fitted to carry out an etherification reaction.

Next, 16 g of a known inorganic synthetic adsorbent was added to the liquid subjected to the etherification reaction, and the mixture was stirred at about 80 ° C. for 30 minutes. Then, it was transferred to a filter precoated with diatomaceous earth, and the inorganic synthetic adsorbent adsorbing the sodium hydroxide catalyst was removed.

A liquid from which the sodium hydroxide catalyst had been removed and 600 g (3 mol) of lauric acid as a fatty acid having 4 to 26 carbon atoms were charged in a reaction vessel and subjected to an esterification reaction to prepare A2-1. A2-2 to A2-12 were also prepared according to this method for synthesizing A2-1.

The type and number of moles of the ester compound in the second ether ester compound, the type and number of moles of the alkylene oxide, and the type and number of moles of the fatty acid having 4 to 26 carbon atoms are shown in the "ester compound" column of Table 3, "alkylene oxide". As shown in the column, "Fatty acid" column.

As shown in Table 4, in A2-13, 62 g (1 mol) of ethylene glycol as a polyhydric alcohol and 600 g (2 mol) of 12-hydroxystearic acid as a monovalent fatty acid were charged into a reaction vessel and esterified. The reaction was carried out. The ester compound obtained by the esterification reaction and 2 g of potassium hydroxide as a catalyst were added to the autoclave to replace the atmosphere with nitrogen gas, and then 1408 g (32 mol) of ethylene oxide was press-fitted to carry out the etherification reaction. went.

Next, 17 g of a known inorganic synthetic adsorbent was added to the liquid subjected to the etherification reaction, and the mixture was stirred at 80 ° C. for 30 minutes. Then, it was transferred to a filter precoated with diatomaceous earth, and the inorganic synthetic adsorbent adsorbing the potassium hydroxide catalyst was removed.

A liquid from which the potassium hydroxide catalyst had been removed and 847 g (3 mol) of oleic acid as a fatty acid having 4 to 26 carbon atoms were charged in a reaction vessel and subjected to an esterification reaction to prepare A2-13. A2-14 to A2-20, Ra-1, and Ra-2 were also prepared according to the method for synthesizing A2-13.

The type and number of moles of the ester compound in the second ether ester compound, the type and number of moles of the alkylene oxide, and the type and number of moles of the fatty acid having 4 to 26 carbon atoms are shown in the "ester compound" column of Table 4, "alkylene oxide". As shown in the column, "Fatty acid" column.

In addition, the ester condensates shown in Table 5 (B-1 to B-21, Rb-1 to Rb-3) were prepared. These ester condensates may be commercially available products or may be produced by a known method. When it is produced by a known method, it can be produced, for example, by a dehydration condensation reaction between a hydroxy group and a carboxy group contained in a raw material.

In Table 5, R ¹ and R ² mean a hydrocarbon group or a hydrogen atom in the hydroxycarboxylic acid having 6 to 22 carbon atoms represented by the above-mentioned Chemical formula 2.
The types ^{of R 1 and R 2} in the ester condensate, the number of carbon atoms of the hydroxycarboxylic acid, the degree of condensation, and the molecular structure are described in the “R ¹ ” column, “R ² ” column, “carbon number” column, and “C” in Table 5. It is as shown in the "Condensation degree" column and the "Molecular structure" column. In the "Molecular structure" column, those having "○" in the "Cyclic" column mean that they have a cyclic molecular structure, and "○" is given in the "Chain" column. Means having a chain-like molecular structure.

Next, using each component shown in Table 6, it was added to the beaker so that the first ether ester compound (A1-1) was 99.5 parts and the ester condensate (B-1) was 0.5 parts. It was. These were stirred well to prepare a treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber of Example 1.

The treatment agents for the non-woven fabrics made of polyolefin-based synthetic fibers of Examples 2 to 40 and Comparative Examples 1 to 7 were prepared by the same method as in Example 1 using each component shown in Table 6. The types and contents of the ether ester compound, the types and contents of the ester condensate, and the types and contents of other components in the treatment agents of each example are shown in the “ Polyolefin-based synthetic fiber non-woven fabric treatment agent” column of Table 6. It is as shown in the "ether ester compound (A)" column, the "ester condensate (B)" column, and the "other component (C)" column, respectively.

Details of C-1 to C-7 described in the column (C) of other components in Table 6 are as follows.

C-1: Potassium lauryl phosphate C-2: Potassium butyl phosphate C-3: Alkyl (12 to 16 carbon atoms) Sodium sulfonate C-4: Polyethylene glycol (molecular weight 600)
C-5: Compound with 10 mol of ethylene oxide added to 1 mol of lauryl alcohol C-6: Compound with 120 mol of propylene oxide added to 1 mol of pentaerythritol C-7: Compound with 120 mol of propylene oxide added to 1 mol of pentaerythritol C-7: For 1 mol of stearate Compound test category 2 to which 20 mol of ethylene oxide was added (manufacture of polyolefin-based spunbonded non-woven fabric)
A polyolefin-based spunbonded non-woven fabric was produced using the treatment agent prepared in Test Category 1.

The treatment agent prepared in Test Category 1 was diluted with water to obtain an aqueous solution having a concentration of 0.25% by mass. A treatment bath (bath temperature 25 ° C.) was prepared using such an aqueous solution, and a polypropylene spunbonded non-woven fabric (with a basis weight of 20 g / m ² ) was immersed in this treatment bath for 5 minutes and taken out. After squeezing the polypropylene spunbonded non-woven fabric by adjusting the drawing ratio with a mangle so that the amount of the aqueous liquid adhered to 2 g is 4 g, the mixture is blown and dried at 80 ° C. for 30 minutes to have a solid content of 0.5. A treated non-woven fabric of mass% was used.

Test category 3 (evaluation)
The wettability of the treatment agents of Examples 1 to 40 and Comparative Examples 1 to 7 with respect to the non-woven fabric was evaluated as an evaluation item of processability. Moreover, as an evaluation item of the non-woven fabric, the durability hydrophilicity of the non-woven fabric to which the treatment agent was attached was evaluated. The procedure for each test is shown below. The test results are shown in "Wetability" and "Durable hydrophilicity" in Table 6.

(Wetness)
Each of the treatment agents described in Examples and Comparative Examples was heated to about 70 ° C. Each heated treatment agent was added to ion-exchanged water heated to about 50 ° C. with stirring to prepare a 10% aqueous solution of the treatment agent.

Next, the polypropylene non-woven fabric to which the treatment agent was not applied was humidity-controlled at 20 ° C. in a thermostatic chamber having a relative humidity of 60% for 24 hours.
10 μl of a 10% aqueous solution of each treatment agent was added dropwise onto the humidity-controlled non-woven fabric. The state in which the treatment agent permeated the non-woven fabric was visually observed. The time required for the treatment agent to completely penetrate was measured and evaluated according to the following evaluation criteria.

・ Evaluation criteria for wettability ◎ (Good): When permeated in less than 4 seconds 〇 (Yes): When permeated in 4 seconds or more and less than 6 seconds × (Poor): When permeated in 6 seconds or more (Durable hydrophilicity )
The spunbonded non-woven fabric produced in Test Category 2 was cut into small pieces of 10 cm × 10 cm. This small piece of non-woven fabric was humidity-controlled for 24 hours in a thermostatic chamber at 20 ° C. and a relative humidity of 60%.

The humidity-controlled non-woven fabric was placed on five laminated filter papers. Further, a cylinder having an inner diameter of 1 cm with both ends open was placed in the central portion on the non-woven fabric so that the axial direction was the vertical direction.
Inside this cylinder, 10 ml of 0.9% saline was injected. The state in which the physiological saline was absorbed by the non-woven fabric was visually observed, and the time until the physiological saline was completely absorbed was measured.

Then, the non-woven fabric was taken out, and warm air at 40 ° C. was blown onto the non-woven fabric for 90 minutes to dry the non-woven fabric. After blast drying, the test of adjusting the humidity of the non-woven fabric to absorb the physiological saline was repeated three times. The third result was evaluated according to the following evaluation criteria.

・ Evaluation criteria for durable hydrophilicity ◎ (Good): When the time required for the saline solution to be completely absorbed is less than 5 seconds 〇 (Yes): The time required for the saline solution to be completely absorbed When 5 seconds or more and less than 7 seconds × (defective): When the time required for the physiological saline solution to be completely absorbed is 7 seconds or more From the results in Table 6, according to the present invention, wetting with polyolefin-based synthetic fibers The property is preferably improved. Further, the durability and hydrophilicity of the spunbonded non-woven fabric made of polyolefin-based synthetic fiber to which the treatment agent for non-woven fabric made of polyolefin-based synthetic fiber is attached can be suitably improved.

Claims (9)

A treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber , which comprises at least one of the following first ether ester compound and the following second ether ester compound, and the following ester condensate.
First ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid.
Second ether ester compound: A compound in which an alkylene oxide having 2 to 4 carbon atoms is added in a total ratio of 1 to 500 mol to 1 mol of an ester compound of a polyhydric alcohol and a monohydric fatty acid, and a compound having 4 carbon atoms. A compound in which ~ 26 fatty acids are condensed.
Ester condensate: A condensate having a structural unit formed of a hydroxycarboxylic acid having 6 to 22 carbon atoms having a hydroxy group and a carboxy group in the molecule and having a degree of condensation of 1 to 5. The treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to claim 1, wherein the content ratio of the ester condensate is 0.01 to 20% by mass. Assuming that the total content of the first ether ester compound, the second ether ester compound, and the ester condensate is 100 parts by mass, the first ether ester compound and the second ether ester compound The treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to claim 1 or 2, which contains at least one selected in an amount of 80 to 99.95 parts by mass and the ester condensate in a proportion of 0.05 to 20 parts by mass. The treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to any one of claims 1 to 3, wherein the hydroxycarboxylic acid is the one shown in Chemical formula 1 below.
(R1: Saturated hydrocarbon group having 4 to 12 carbon atoms or unsaturated hydrocarbon group having 4 to 12 carbon atoms ^{in Chemical formula 1.}
R ² : Hydrogen atom or saturated hydrocarbon group having 1 to 8 carbon atoms. ) The treatment agent for a polyolefin-based synthetic fiber for non-woven fabric according to claim 4, wherein R 1 in Chemical ^{formula 1} is a saturated hydrocarbon group having 8 to 10 carbon atoms or an unsaturated hydrocarbon group having 8 to 10 carbon atoms. Claim 4 or 5 in which R ² in Chemical formula 1 is a saturated hydrocarbon group having 6 to 8 carbon atoms.
The treatment agent for non-woven fabrics made of polyolefin-based synthetic fibers according to. The treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to any one of claims 1 to 6, wherein the ester condensate has a degree of condensation of 1 to 2 and a cyclic molecular structure. A polyolefin-based synthetic fiber to which the treatment agent for a non-woven fabric made of the polyolefin-based synthetic fiber according to any one of claims 1 to 7 is attached. A spunbonded nonwoven fabric made of a polyolefin-based synthetic fiber, wherein the treatment agent for a non-woven fabric made of a polyolefin-based synthetic fiber according to any one of claims 1 to 7 is attached.