CN113576767B - Reinforced structure paper diaper with composite core - Google Patents

Abstract

The invention relates to the field of disposable sanitary products, and discloses a paper diaper with a reinforced structure and a composite core body, which comprises a paper diaper body, the paper diaper body is formed by sequentially adhering an air-permeable surface layer, a flow guide layer, a composite core body and a leakage-proof bottom layer through degradable hot melt adhesive, the composite core body sequentially comprises dust-free paper, an upper absorption layer, an elastic layer, a lower absorption layer and spun-bonded non-woven fabric from top to bottom, the upper absorption layer comprises a middle area and side leakage prevention areas at two transverse sides of the middle area, a plurality of upper absorption sections are longitudinally distributed in the middle area and are arranged at intervals, the distribution density of the super absorbent resin on the side leakage preventing region is larger than that of the upper absorption section, a plurality of lower absorption sections are longitudinally distributed on the lower absorption layer, the lower absorption sections are arranged at intervals, and all layers of the composite core body are bonded through degradable hot melt adhesive. The paper diaper solves the problems that the existing paper diaper is easy to agglomerate, lump, crack and layer, and the hot melt adhesive adopted for bonding is good in bonding effect and degradable.

Description

A reinforced structure diaper with composite core

technical field

The invention relates to the field of disposable sanitary products, in particular to a reinforced structure paper diaper with a composite core.

Background technique

Diapers mainly include the following parts: a liquid-permeable surface layer, an absorbent core and a leak-proof bottom layer. For diapers, the absorbent core is the most important component of diapers, and it is the decisive factor that determines the quality of diapers. The traditional diapers are mainly made of wood pulp core. The wood pulp core is mixed with fluff pulp and super absorbent resin. The wood pulp core absorbs water quickly, but the structure is relatively loose. Delamination phenomenon, in addition to long-term use of local absorption is too large, it will also cause leakage of urine. To this end, people in the industry have developed and improved the absorbent core, and proposed various composite core structures. For example, patent application number: 201810163508.1 discloses a composite core for diapers. surface layer, absorption layer and waterproof layer; the absorption layer includes polymer water-absorbing particles and a fixed frame, the fixed frame is a hollow rectangular grid-shaped frame, and the polymer water-absorbing particles are arranged in an array in the fixed frame ; The upper surface of the waterproof layer is provided with dotted glue arranged in an array. The invention arranges the polymer water-absorbing particles in an array in the fixed frame, which can not only prevent the polymer water-absorbing particles from falling out of the composite core and easily generate dust, but also ensure that the composite core is not easy to agglomerate, and the composite core is not easily produced. Less raw materials are required, lower cost and more environmentally friendly.

SUMMARY OF THE INVENTION

Therefore, in view of the above content, the present invention provides a reinforced structure diaper with a composite core, which solves the problems that the existing diapers are easy to agglomerate, clump, break and delaminate.

To achieve the above object, the present invention is achieved through the following technical solutions:

A reinforced structure diaper with a composite core, comprising a diaper body, the diaper is defined to have a longitudinal direction along the length direction and a transverse direction along the width direction, the diaper body is composed of a breathable surface layer, a flow guiding layer, a composite core and a The anti-leakage bottom layer is sequentially bonded by degradable hot melt adhesive, and the composite core body includes, from top to bottom, clean paper, an upper absorbing layer, an elastic layer, a lower absorbing layer, and a spunbond non-woven fabric. The absorption layer includes a middle area and side leakage prevention areas on both lateral sides of the middle area, the middle area is longitudinally distributed with several upper absorption sections, and the upper absorption sections are arranged at intervals, and the high water absorption on the side leakage prevention area The distribution density of the absorbent resin is greater than that of the upper absorbent section, the lower absorbent layer is longitudinally distributed with several lower absorbent sections, the lower absorbent sections are arranged at intervals, and the layers of the composite core are bonded by degradable hot-melt adhesives. Synthesized to form a whole, the degradable hot-melt adhesive includes the following raw materials in parts by weight: 60-80 parts of polybutylene adipate-terephthalate, 28-42 parts of degradable polyester, and modified raw materials. 20-40 parts of material waste and 12-18 parts of viscosity modifier. The upper absorption section and the lower absorption section are both mixed with fluff pulp and super absorbent resin.

A further improvement is that the projected areas of the upper absorption section and the lower absorption section in the longitudinal direction do not overlap.

A further improvement is: the modified biomass waste is prepared according to the following steps: (1) the bagasse is washed, dried, pulverized and sieved to obtain bagasse powder, and then immersed in a potassium hydroxide solution with a concentration of 30wt% , stir and mix at 50-60 ℃ for 40-80min, then carry out ultrasonic treatment, and then stand for 6-8h, then suction filtration, wash with water until neutral, to obtain the treated bagasse powder; (2) the treated bagasse The powder was put into the reaction kettle, then potassium hydroxide solution with a concentration of 30wt%, dimethylformamide, benzyl chloride, benzyltriethylammonium chloride was added, and the reaction was stirred at 105-115 ° C for 3-5h, and the reaction was completed. After cooling, filtering and drying, the modified biomass waste is obtained.

A further improvement is: in step (1), the mass ratio of bagasse powder and potassium hydroxide solution is 1:1.8-3.2.

A further improvement is: in step (1), the parameters of ultrasonic treatment are power 300-500W and treatment time 1-2h.

A further improvement is: the potassium hydroxide solution in step (1) is added with ethanol, and the added amount is 10-20% of the quality of the bagasse powder.

A further improvement is: the quality of the bagasse powder treated in step (2) is calculated as 100%, and the consumption of each substance is: potassium hydroxide solution 300-500%, dimethylformamide 800-900%, benzyl chloride 420-480%, Benzyltriethylammonium chloride 0.8-2%.

A further improvement is: the specific preparation process of the degradable polyester is: mixing malic acid, phthalic acid, and 2,6-naphthalenedicarboxylic acid to form a mixed acid, and mixing 1,5-pentanediol and ethylene glycol Form mixed alcohol, then according to the addition ratio of mixed acid and mixed alcohol molar ratio of 1:1.5, put mixed acid and mixed alcohol into the reactor, add phosphoric acid, antioxidant 164, catalyst at the same time, carry out esterification at 200 ℃ temperature The reaction is carried out for 2 hours, and then the polycondensation reaction is carried out under the conditions of a pressure of 60-80 Pa and a temperature of 210-220° C. for 60-90 minutes to obtain a degradable polyester.

A further improvement is: the molar ratio of malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid in the mixed acid is 2:3:4.

A further improvement is: the molar ratio of 1,5-pentanediol and ethylene glycol in the mixed alcohol is 2:1.

A further improvement is: the added amounts of the phosphoric acid, the antioxidant 164 and the catalyst are respectively 0.5-0.8%, 0.2-0.4% and 0.005-0.015% of the sum of the mass of the mixed acid and the mixed alcohol.

A further improvement is: the catalyst is formed by mixing germanium oxide and zinc acetate in a mass ratio of 1:0.8-1.

A further improvement is: the weight-average molecular weight of the polybutylene adipate-terephthalate is 50,000-100,000. Within this range, as the weight average molecular weight increases, the adhesive strength of the hot melt adhesive increases, and the adhesive strength is the best when the weight average molecular weight is 80,000.

By adopting the foregoing technical scheme, the beneficial effects of the present invention are:

1. The absorption capacity of the diaper is improved by the arrangement of the upper absorption layer and the lower absorption layer. During use, the upper absorbent layer and the lower absorbent layer expand after absorbing water, and the elastic layer can provide vertical expansion space for them, which can effectively avoid the phenomenon of lumping, fracture and delamination of the composite core during use, and improve the high water absorption. utilization of resin. The upper absorbing section and the lower absorbing section are arranged at intervals, which can not only provide the expansion space in the horizontal direction for the superabsorbent resin after absorbing water, but also make the urine infiltrate quickly and maximize the utilization of the material of the lower absorbent layer. When the amount of urination is too much, the urine is too late to be absorbed and easily diffuses and flows to the side of the diaper. Infants and young children are also prone to side leakage of urine when urinating on their side and turning over. The present invention divides the upper absorbing layer into a leak-proof area and a middle area. , and the distribution density of the super absorbent resin in the anti-side leakage area is greater than that of the upper absorbing section in the middle area, which effectively prevents the possibility of side leakage.

2. Each layer structure of the existing diaper body is generally formed as a whole by hot-melt adhesive bonding. The most commonly used matrix resins for the production of hot-melt adhesives on the market include ethylene-vinyl acetate copolymer (EVA), polyolefin, polyurethane, etc. Olefin hot-melt adhesives cannot be degraded or hydrolyzed by microorganisms in the environment, which brings a heavy burden to the natural environment; the vinyl acetate content in EVA can only be used for hot-melt adhesives and coating products when the content of vinyl acetate is 20-28%, which mainly depends on Imported, expensive; polyurethane hot melt adhesive degrades slowly under natural conditions and has a long degradation cycle. Polymers such as polylactic acid and polycaprolactone are biodegradable and are ideal substitute raw materials for the production of degradable hot melt adhesives. However, in terms of cost, the prices of polylactic acid and polycaprolactone are relatively high; in terms of chemical properties , the two have low melt strength and poor thermal stability, which affect the bonding effect. The present invention uses polybutylene adipate-terephthalate as the matrix resin, and is coordinated with degradable polyester, modified biomass waste and other raw materials, and is blended and modified to obtain high bonding strength and biodegradation. Sexual hot melt adhesive. Among them, polybutylene adipate-terephthalate is a thermoplastic biodegradable plastic with excellent biodegradability, which has both the properties of polybutylene adipate and polybutylene terephthalate. Characteristics, not only good ductility and elongation at break, but also good heat resistance and impact performance. Through the esterification and polycondensation reaction of various dibasic acids and dibasic alcohols, the prepared degradable polyester has good viscosity and biodegradability, and improves the bonding strength of the hot melt adhesive. Bagasse is the waste left over from sugarcane processing and is rich in cellulose. The present application utilizes the excellent degradability and reactivity of cellulose to prepare modified biomass waste, which not only realizes the recycling of waste, but also modifies cellulose. It has thermoplastic properties, which can reduce the amount of matrix resin and improve the degradation speed of hot melt adhesive. The cellulose contained in bagasse has a high degree of crystallinity. In its complex supramolecular structure, the crystalline region and the amorphous region coexist, a large number of highly reactive hydroxyl groups are enclosed in the crystalline region, and there are a large number of intermolecular and intramolecular hydrogen bonds. This affects the reaction speed and uniformity of cellulose modification. The bagasse powder is immersed in potassium hydroxide solution for pretreatment, which can achieve swelling, decrystallization, and improve the reaction performance. Adding ethanol to potassium hydroxide solution can prevent the formation of intermolecular hydrogen bonds of cellulose, help decrystallization and lattice transformation, reduce crystallinity, and improve the reactivity of cellulose.

Description of drawings

1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

Fig. 2 is the structural representation of the diaper body in the embodiment 1;

3 is a schematic structural diagram of a composite core in Example 1;

4 is a schematic structural diagram of the upper absorption layer in Example 1;

5 is a schematic structural diagram of a lower absorption layer in Example 1;

6 is a side view of the upper absorbing layer and the lower absorbing layer in Example 1. FIG.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to specific examples, so as to fully understand and implement the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects.

Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the used reagents and products are also commercially available. The source and trade name of the reagents used, as well as those necessary to list their components, are indicated when they appear for the first time.

Example 1

1 to 6, a reinforced structure diaper with a composite core includes a diaper body 1, and the diaper is defined to have a longitudinal direction along the length direction and a transverse direction along the width direction, and the longitudinal sides of the diaper body 1 are provided. There are a front waistline 2 and a back waistline 3, the back waistline 3 is provided with a Velcro barbed surface 4 on both lateral sides, the front waistline 2 is provided with a Velcro surface 5 on the side away from the skin, and the hook surface Velcro 4 is provided with a Velcro surface 5. The wool surface Velcro 5 is bonded and matched, and the lateral sides of the diaper body 1 are provided with leak-proof guards 6. The diaper body 1 is composed of a breathable surface layer 7, a flow guiding layer 8, a composite core 9 and a leak-proof cover. The bottom layer is sequentially bonded by degradable hot melt adhesive. The composite core 9 includes, from top to bottom, clean paper 10, an upper absorbing layer 11, an elastic layer 12, a lower absorbing layer 13, and a spunbond non-woven fabric 14. , the layers of the composite core are bonded by degradable hot-melt adhesive, the upper absorbent layer 11 includes a middle region 11a and side leakage prevention regions 11b on both lateral sides of the middle region 11a, and the middle region 11a is along the longitudinal direction. A number of upper absorbing sections 15 are distributed, and the upper absorbing sections 15 are arranged at intervals. The density of the superabsorbent resin on the side leakage prevention area 11b is greater than that of the upper absorbing section 15. The lower absorbing layer 13 is longitudinally distributed with Several lower absorption sections 16 are arranged at intervals, and the lower absorption sections 16 are located directly below the gap between the adjacent upper absorption sections 15 and do not overlap with the projections of the upper absorption sections 15, forming a mutual Dislocation, the leak-proof bottom layer is composed of the breathable film 17 and the water-repellent non-woven fabric 18 under the breathable film 17.

The elastic layer is composed of a hot air non-woven fabric and a cotton non-woven fabric, which not only retains the softness, water absorption and air permeability of the all-cotton non-woven fabric, but also maintains the high bulkiness and elasticity of the hot air non-woven fabric. Good performance, the specific preparation method can be found in Patent No. 201610777897.8.

The preparation method of the degradable hot melt adhesive is:

a. Preparation of the modified biomass waste:

(1) bagasse cleaning, drying, pulverizing, sieving obtain bagasse powder, then immersed in the potassium hydroxide solution of concentration 30wt%, the mass ratio of bagasse powder and potassium hydroxide solution is 1:1.8, and adding 10% ethanol by mass of bagasse powder, then stirred and mixed at 50°C for 80min, then ultrasonically treated for 1h, power 500W, left standing for 6h, suction filtered, washed with water until neutral, to obtain the treated bagasse powder; (2 ) Put the treated bagasse powder into the reactor, then add potassium hydroxide solution with a concentration of 30wt%, dimethylformamide, benzyl chloride, benzyltriethylammonium chloride, and stir the reaction at 105 ° C for 3h , cooling, filtering and drying after the reaction is completed to obtain modified biomass waste. The quality of the treated bagasse powder is calculated as 100%, the dosage of potassium hydroxide solution is 300%, the dosage of dimethylformamide is 800%, the dosage of benzyl chloride is 420%, and the dosage of benzyltriethylammonium chloride is 0.8%.

b. Preparation of degradable polyester:

Malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid are mixed to form a mixed acid, 1,5-pentanediol and ethylene glycol are mixed to form a mixed alcohol, and then the molar ratio of mixed acid and mixed alcohol is 1:1.5. Addition ratio, put the mixed acid and mixed alcohol into the reaction kettle, add phosphoric acid, antioxidant 164, catalyst at the same time, carry out the esterification reaction at 200℃ for 2h, and then carry out the polycondensation reaction under the conditions of pressure 60Pa and temperature 210℃ for 60min , to obtain degradable polyester. Among them, the molar ratio of 1,5-pentanediol and ethylene glycol is 2:1, the molar ratio of malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid is 2:3:4, phosphoric acid, antioxidant The addition amount of the agent 164 and the catalyst are respectively 0.5%, 0.2% and 0.005% of the mass of the mixed acid and the mixed alcohol, and the catalyst is made by mixing germanium oxide and zinc acetate in a mass ratio of 1:0.8.

c. Extrusion granulation:

Each raw material was weighed according to the following mass ratios: 60 parts of polybutylene adipate-terephthalate, 28 parts of degradable polyester, 20 parts of modified biomass waste, and 12 parts of polyethylene wax. The weight-average molecular weight of adipic acid-butylene terephthalate is 50,000;

After mixing poly(butylene adipate-terephthalate), degradable polyester, modified biomass waste, and viscosity modifier uniformly, add it to a twin-screw extruder for extrusion and granulation to obtain degradable Hot melt glue.

Example 2

A reinforced structure diaper with a composite core, the structure of which is the same as that of Example 1, the difference lies in the preparation of the degradable hot-melt adhesive, and the specific preparation steps are as follows:

a. Preparation of the modified biomass waste:

(1) bagasse cleaning, drying, pulverizing, sieving obtain bagasse powder, then immersed in the potassium hydroxide solution of concentration 30wt%, the mass ratio of bagasse powder and potassium hydroxide solution is 1:2.5, and adding 15% ethanol by mass of bagasse powder, then stirred and mixed at 55°C for 60min, then ultrasonically treated for 90min, power 400W, left standing for 7h, suction filtered, washed with water until neutral, to obtain the treated bagasse powder; (2 ) Put the treated bagasse powder into the reaction kettle, then add potassium hydroxide solution with a concentration of 30wt%, dimethylformamide, benzyl chloride, benzyltriethylammonium chloride, and stir the reaction at 110°C for 4h , cooling, filtering and drying after the reaction is completed to obtain modified biomass waste. The quality of the treated bagasse powder is calculated as 100%, and the amount of potassium hydroxide solution is 400%, the amount of dimethylformamide is 850%, the amount of benzyl chloride is 450%, and the amount of benzyltriethylammonium chloride is 1.5%.

b. Preparation of degradable polyester:

Malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid are mixed to form a mixed acid, 1,5-pentanediol and ethylene glycol are mixed to form a mixed alcohol, and then the molar ratio of mixed acid and mixed alcohol is 1:1.5. Adding ratio, put the mixed acid and mixed alcohol into the reaction kettle, add phosphoric acid, antioxidant 164 and catalyst at the same time, carry out the esterification reaction at 200℃ for 2h, and then perform the polycondensation reaction under the conditions of pressure of 70Pa and temperature of 215℃ for 80min , to obtain degradable polyester. Among them, the molar ratio of 1,5-pentanediol and ethylene glycol is 2:1, the molar ratio of malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid is 2:3:4, phosphoric acid, antioxidant The addition amount of the agent 164 and the catalyst are respectively 0.65%, 0.3% and 0.01% of the sum of the mass of the mixed acid and the mixed alcohol, and the catalyst is formed by mixing germanium oxide and zinc acetate in a mass ratio of 1:0.9.

c. Extrusion granulation:

Weigh each raw material according to the following mass proportions: 70 parts of poly(butylene terephthalate), 35 parts of degradable polyester, 30 parts of modified biomass waste, and 15 parts of EVA. - the weight-average molecular weight of butylene terephthalate is 80,000;

After mixing poly(butylene adipate-terephthalate), degradable polyester, modified biomass waste, and viscosity modifier uniformly, add it to a twin-screw extruder for extrusion and granulation to obtain degradable Hot melt glue.

Example 3

A reinforced structure diaper with a composite core, the structure of which is the same as that of Example 1, the difference lies in the preparation of the degradable hot-melt adhesive, and the specific preparation steps are as follows:

a. Preparation of the modified biomass waste:

(1) bagasse cleaning, drying, pulverizing, sieving obtain bagasse powder, then immersed in the potassium hydroxide solution of concentration 30wt%, the mass ratio of bagasse powder and potassium hydroxide solution is 1:3.2, and adding The bagasse powder mass is 20% ethanol, then stirred and mixed at 60° C. for 40 minutes, then ultrasonically treated for 2 hours with a power of 300W, left standing for 8 hours, filtered with suction, washed with water until neutral, to obtain the treated bagasse powder; (2 ) Put the treated bagasse powder into the reactor, then add potassium hydroxide solution with a concentration of 30wt%, dimethylformamide, benzyl chloride, benzyltriethylammonium chloride, and stir the reaction at 115°C for 3h , cooling, filtering and drying after the reaction is completed to obtain modified biomass waste. The quality of the treated bagasse powder is calculated as 100%, and the amount of potassium hydroxide solution is 500%, the amount of dimethylformamide is 900%, the amount of benzyl chloride is 480%, and the amount of benzyltriethylammonium chloride is 2%.

b. Preparation of degradable polyester:

Malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid are mixed to form a mixed acid, 1,5-pentanediol and ethylene glycol are mixed to form a mixed alcohol, and then the molar ratio of mixed acid and mixed alcohol is 1:1.5. Adding ratio, put the mixed acid and mixed alcohol into the reaction kettle, add phosphoric acid, antioxidant 164 and catalyst at the same time, carry out the esterification reaction at 200℃ for 2h, and then carry out the polycondensation reaction under the conditions of pressure 80Pa and temperature 220℃ for 90min , to obtain degradable polyester. Among them, the molar ratio of 1,5-pentanediol and ethylene glycol is 2:1, the molar ratio of malic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid is 2:3:4, phosphoric acid, antioxidant The addition amount of agent 164 and catalyst is 0.8%, 0.4% and 0.015% of the sum of the mass of mixed acid and mixed alcohol respectively, and the catalyst is made by mixing germanium oxide and zinc acetate in a mass ratio of 1:1.

c. Extrusion granulation:

Each raw material was weighed according to the following mass ratios: 80 parts of polybutylene adipate-terephthalate, 42 parts of degradable polyester, 40 parts of modified biomass waste, and 18 parts of naphthenic oil. The weight-average molecular weight of adipic acid-butylene terephthalate is 100,000;

After mixing poly(butylene adipate-terephthalate), degradable polyester, modified biomass waste, and viscosity modifier uniformly, add it to a twin-screw extruder for extrusion and granulation to obtain degradable Hot melt glue.

Example 4

A reinforced structure diaper with a composite core, the structure of which is the same as that of Example 1, the difference is that the modified biomass waste used in the degradable hot-melt adhesive does not add ethanol during the preparation process, and other raw material components prepared by the hot-melt adhesive are used. Its content is the same as that of Example 1.

Comparative Example 1

A reinforced structure diaper with a composite core, its structure is the same as that of Example 1, the difference is that the degradable hot-melt adhesive is made from the raw materials of the following mass ratios: polyadipate-butylene terephthalate ( Weight average molecular weight 50000) 60 parts, acetyl tributyl citrate 4 parts, degradable polyester 28 parts, modified biomass waste 20 parts, polyethylene wax 12 parts, the preparation method of degradable hot melt adhesive is the same as that of embodiment 1 .

Comparative Example 2

A reinforced structure diaper with a composite core, its structure is the same as that of Example 1, the difference is that the degradable hot-melt adhesive is made from the raw materials of the following mass ratios: polyadipate-butylene terephthalate ( Weight-average molecular weight 50000) 60 parts, 4 parts of acetyl tributyl citrate, 24 parts of degradable polyester, 20 parts of modified biomass waste, 12 parts of polyethylene wax, the preparation method of degradable hot melt adhesive is the same as that of Example 1 .

Comparative Example 3

A reinforced structure diaper with a composite core, the structure of which is the same as that of Example 1, the difference is that the raw material of the degradable hot-melt adhesive is degradable polyester replaced by a tackifying resin-rosin resin, and other components of the degradable hot-melt adhesive The content and preparation method are the same as those in Example 1.

Comparative Example 4

A reinforced structure diaper with a composite core, the structure of which is the same as that of Example 1, the difference is that no modified biomass waste is added to the formula of the degradable hot-melt adhesive, and the modified biomass waste of the same weight is replaced with polyhexane Diacid-butylene terephthalate, the content of other components of the degradable hot-melt adhesive and the preparation method are the same as those in Example 1.

The degradable hot melt adhesives obtained in Examples 1-4 and Comparative Examples 1-4 were tested for performance, wherein the detection method of peel strength adopted GB/T2791-95, the detection method of elongation at break adopted ASTM D638, and the melt viscosity (160°C) detection method adopts HGT 3660-1999 standard. The obtained degradable hot-melt adhesive samples were placed under outdoor environmental conditions for a period of time, and the changes in their quality were measured regularly. Table 1 shows:

Table 1

It can be seen from Table 1 that the hot melt adhesive prepared in the embodiment of the present invention has good adhesive strength, toughness, heat resistance and fluidity. Compared with Example 1, in Comparative Example 1, a new plasticizer, acetyl tributyl citrate, was added, which had little change in peel strength and elongation at break; in Comparative Example 2, part of the degradable polyester was replaced with The plasticizer acetyl tributyl citrate, the peel strength and elongation at break decreased; in Comparative Example 3, after replacing the degradable polyester with rosin resin, the peel strength and elongation at break became significantly worse, and the hot melt The melt viscosity of the glue is greatly increased, which affects the degree of infiltration of the adherend, and the bonding effect is obviously deteriorated; in Comparative Example 4, no modified biomass waste is added, although the elongation at break increases, but the bonding effect deteriorates . It can be seen from Comparative Examples 1-2 and Example 1 that the degradable polyester can not only play the role of tackifying resin, but also act as a plasticizer to improve the elongation at break of the hot melt adhesive.

The above records are only examples of utilizing the technical content of this creation, and any modifications and changes made by those skilled in the art using this creation are all within the scope of the patent claimed in this creation, and are not limited to those disclosed in the embodiments.

Claims (12)

1. A reinforced structure diaper with a composite core body comprises a diaper body, wherein the diaper is defined to have a longitudinal direction along a length direction and a transverse direction along a width direction, and the reinforced structure diaper is characterized in that: the panty-shape diapers body loops through the bonding of degradable hot melt adhesive by gas permeability surface course, water conservancy diversion layer, compound core and leak protection bottom and forms, compound core includes dustless paper, last absorbed layer, elastic layer, lower absorbed layer, the spunbonded nonwoven by last under to in proper order, it includes the side drain region of preventing of the horizontal both sides in middle part district and middle part district to go up the absorbed section along longitudinal distribution, each in the middle part district go up the absorbed section interval and set up, the distribution density of preventing the super absorbent resin in the side drain region is greater than the absorbed section, the absorbed section is down along longitudinal distribution to the absorbed layer down, each absorb the section interval and set up down, bond through the degradable hot melt adhesive between each layer of compound core, the degradable hot melt adhesive includes each raw materials of following parts by weight: 60-80 parts of poly (butylene adipate-terephthalate), 28-42 parts of degradable polyester, 20-40 parts of modified biomass waste and 12-18 parts of viscosity regulator;

the modified biomass waste is prepared by the following steps: (1) cleaning, drying, crushing and sieving bagasse to obtain bagasse powder, then soaking the bagasse powder into a potassium hydroxide solution with the concentration of 30wt%, stirring and mixing for 40-80min at 50-60 ℃, then carrying out ultrasonic treatment, standing for 6-8h, carrying out suction filtration, and washing to neutrality to obtain the treated bagasse powder; (2) and (3) putting the treated bagasse powder into a reaction kettle, adding a 30wt% potassium hydroxide solution, dimethylformamide, benzyl chloride and benzyltriethylammonium chloride, stirring and reacting for 3-5h at the temperature of 105-115 ℃, and cooling, filtering and drying after the reaction is finished to obtain the modified biomass waste.

2. A reinforced structural pant diaper having a composite core as claimed in claim 1, wherein: the projection areas of the upper absorption section and the lower absorption section in the longitudinal direction are not overlapped.

3. A reinforced structural pant diaper having a composite core as claimed in claim 1, wherein: the mass ratio of the bagasse powder to the potassium hydroxide solution in the step (1) is 1: 1.8-3.2.

4. The reinforced structural pant diaper having a composite core as claimed in claim 1, wherein the diaper comprises a diaper core and a diaper core

The method comprises the following steps: in the step (1), the ultrasonic treatment parameter is 300-500W, and the treatment time is 1-2 h.

5. A reinforced structural pant diaper having a composite core according to any of claims 3-4, wherein: and (2) adding ethanol into the potassium hydroxide solution in the step (1), wherein the adding amount is 10-20% of the mass of the bagasse powder.

6. A reinforced structural pant diaper having a composite core as claimed in claim 1, wherein: the mass of the bagasse powder treated in the step (2) is calculated by 100%, and the dosage of each substance is as follows: 300-500% of potassium hydroxide solution, 900% of dimethylformamide, 480% of benzyl chloride and 0.8-2% of benzyltriethylammonium chloride.

7. A reinforced structural pant diaper having a composite core as claimed in claim 1, wherein: the specific preparation process of the degradable polyester comprises the following steps: malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid are mixed to form mixed acid, 1, 5-pentanediol and ethylene glycol are mixed to form mixed alcohol, then the mixed acid and the mixed alcohol are put into a reaction kettle according to the adding proportion of the molar ratio of the mixed acid to the mixed alcohol being 1:1.5, phosphoric acid, an antioxidant 164 and a catalyst are added at the same time, esterification reaction is carried out for 2h at the temperature of 200 ℃, and then polycondensation reaction is carried out for 60-90min under the conditions of the pressure of 60-80Pa and the temperature of 210-220 ℃, so as to prepare the degradable polyester.

8. A reinforced structural pant diaper having a composite core as claimed in claim 7, wherein: the molar ratio of malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid in the mixed acid is 2:3: 4.

9. A reinforced structural pant diaper having a composite core as claimed in claim 7, wherein: the molar ratio of 1, 5-pentanediol to ethylene glycol in the mixed alcohol is 2: 1.

10. A reinforced structural pant diaper having a composite core as claimed in claim 7, wherein: the addition amounts of the phosphoric acid, the antioxidant 164 and the catalyst are respectively 0.5-0.8%, 0.2-0.4% and 0.005-0.015% of the sum of the mass of the mixed acid and the mixed alcohol.

11. The reinforced structural pant diaper of claim 7, wherein the diaper has a composite core

The method comprises the following steps: the catalyst is prepared by mixing germanium oxide and zinc acetate according to the mass ratio of 1: 0.8-1.

12. The reinforced structural pant diaper of claim 1, wherein the diaper has a composite core

The method comprises the following steps: the weight average molecular weight of the polybutylene adipate-terephthalate is 50000-100000.

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