CN113576767B

CN113576767B - Reinforced structure paper diaper with composite core

Info

Publication number: CN113576767B
Application number: CN202110872250.4A
Authority: CN
Inventors: 谢锡佳; 陈宗哲; 利莉
Original assignee: Guangdong Cojin Co ltd
Current assignee: Guangdong Cojin Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-05-31
Anticipated expiration: 2041-07-30
Also published as: CN113576767A

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

Reinforced structure paper diaper with composite core

Technical Field

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

Background

The paper diaper mainly comprises the following parts: a liquid permeable surface layer, an absorption core body and a leakage-proof bottom layer. In the case of diapers, the absorbent core is the most important component of the diaper and is the determining factor for determining the quality of the diaper product. Traditional panty-shape diapers mainly use the wood pulp core as the main, and the wood pulp core is formed by fluff pulp and super absorbent resin mixture, and the wood pulp core absorbs water fastly, but the structure is more loose, easily takes place in the use top, fracture layering phenomenon, uses local absorbed dose too big in addition for a long time, still can cause urine leakage. To this end, those skilled in the art have developed and improved absorbent cores and proposed various composite core structures, such as those described in the following patent application nos.: 201810163508.1 discloses a composite core body for paper diaper, which comprises a surface layer, an absorption layer and a waterproof layer arranged from top to bottom in sequence; the absorption layer comprises high-molecular water-absorbing particles and a fixed frame, the fixed frame is a hollow rectangular grid-shaped frame, and the high-molecular water-absorbing particles are arranged in the fixed frame in an array manner; the upper surface of the waterproof layer is provided with dot-shaped glue arranged in an array. According to the invention, the high-molecular water-absorbing particles are arranged in the fixed frame in an array manner, so that the high-molecular water-absorbing particles can be prevented from falling off the composite core body to generate dust easily, the composite core body is ensured not to be agglomerated easily, and the composite core body is less in raw material required for manufacturing, lower in cost and more environment-friendly.

Disclosure of Invention

Therefore, aiming at the content, the invention provides a paper diaper with a reinforced structure of a composite core body, which solves the problems that the existing paper diaper is easy to agglomerate, lump, break and layer.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a reinforced structure paper diaper with a composite core body comprises a paper diaper body, wherein the paper diaper body is defined to have the longitudinal direction along the length direction and the transverse direction along the width direction, the paper diaper body is formed by sequentially bonding an air-permeable surface layer, a flow guide layer, the 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 lateral leakage prevention region at the transverse two sides of a middle region and the middle region, a plurality of upper absorption sections are longitudinally distributed in the middle region and are arranged at intervals, the distribution density of high-water-absorption resin on the lateral leakage prevention region is greater than that of the upper absorption sections, a plurality of lower absorption sections are longitudinally distributed on the lower absorption layer and are arranged at intervals, the lower absorption sections are bonded through the degradable hot melt adhesive to form a whole between the layers of the composite core body, the degradable hot melt adhesive comprises the following raw materials in 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 upper absorption section and the lower absorption section are both formed by mixing fluff pulp and super absorbent resin.

The further improvement is that: the projected areas of the upper absorption section and the lower absorption section in the longitudinal direction are not overlapped.

The further improvement is that: 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.

The further improvement is that: the mass ratio of the bagasse powder to the potassium hydroxide solution in the step (1) is 1: 1.8-3.2.

The further improvement is that: in the step (1), the ultrasonic treatment parameter is 300-500W, and the treatment time is 1-2 h.

The further improvement is that: 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.

The further improvement is that: 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.

The further improvement is that: the specific preparation process of the degradable polyester comprises the following steps: mixing malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid to form mixed acid, mixing 1, 5-pentanediol and ethylene glycol to form mixed alcohol, then putting the mixed acid and the mixed alcohol into a reaction kettle according to the adding proportion of the molar ratio of the mixed acid to the mixed alcohol of 1:1.5, simultaneously adding phosphoric acid, an antioxidant 164 and a catalyst, carrying out esterification reaction for 2h at the temperature of 200 ℃, and then carrying out polycondensation reaction for 60-90min under the conditions of the pressure of 60-80Pa and the temperature of 210 ℃ and 220 ℃ to obtain the degradable polyester.

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

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

The further improvement is that: 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.

The further improvement is that: the catalyst is prepared by mixing germanium oxide and zinc acetate according to the mass ratio of 1: 0.8-1.

The further improvement is that: the weight average molecular weight of the poly (butylene adipate-terephthalate) is 50000-100000. Within this range, the adhesive strength of the hot melt adhesive increases with the increase in the weight average molecular weight, and the adhesive strength is most suitable when the weight average molecular weight is 80000.

By adopting the technical scheme, the invention has the beneficial effects that:

1. the absorption capacity of the paper diaper is improved by the arrangement of the upper absorption layer and the lower absorption layer. In the use process, the upper absorption layer and the lower absorption layer expand after absorbing water, the elastic layer can provide an expansion space in the vertical direction for the upper absorption layer and the lower absorption layer, the phenomena of lump formation, fracture and layering of the composite core body in the use process are effectively avoided, and the utilization rate of the super absorbent resin is improved. The upper absorption section and the lower absorption section are arranged at intervals, so that expansion space in the horizontal direction can be provided for the super absorbent resin after water absorption, and meanwhile, urine can be quickly infiltrated downwards, and the utilization maximization of the material of the lower absorption layer is realized. When the urination amount is too large, the urine cannot be absorbed in time and is easy to diffuse and flow to the side edge of the paper diaper, and the urine is easy to leak laterally when the infant lies laterally and turns over.

2. The structures of all layers of the existing paper diaper body are generally bonded into a whole by hot melt adhesives, the most common matrix resins for producing the hot melt adhesives in the market comprise ethylene-vinyl acetate copolymers (EVA), polyolefin, polyurethane and the like, and the polyolefin hot melt adhesives cannot be degraded or hydrolyzed by microorganisms in the environment, so that heavy burden is brought to the natural environment; the EVA with 20-28% of vinyl acetate content can be used for hot melt adhesive and coating products, mainly depends on import and is expensive; the polyurethane hot melt adhesive is slowly degraded under natural conditions, and the degradation period is long. The polylactic acid, polycaprolactone and other polymers have biodegradability and are ideal substitute raw materials for producing the degradable hot melt adhesive, but in view of cost, the price of the polylactic acid and the polycaprolactone is relatively high; from the chemical property, the two have low melt strength and poor thermal stability, and influence the bonding effect. The invention takes poly adipic acid-butylene terephthalate as matrix resin, and the poly adipic acid-butylene terephthalate is cooperated with degradable polyester, modified biomass waste and other raw materials, and the hot melt adhesive with high bonding strength and biodegradability is obtained by blending modification. Among them, the polybutylene adipate-terephthalate belongs to thermoplastic biodegradable plastics, has excellent biodegradability, has the characteristics of the polybutylene adipate and the polybutylene terephthalate, and has good ductility and elongation at break as well as good heat resistance and impact performance. The degradable polyester prepared by the esterification and polycondensation reaction of various dibasic acids and dihydric alcohol has good viscosity and biodegradability, and the bonding strength of the hot melt adhesive is improved. The bagasse is the waste left by processing the sugarcane, contains abundant cellulose, and the application prepares the modified biomass waste by utilizing the excellent degradability and reactivity of the cellulose, thereby not only realizing the recycling of the waste, but also having thermoplasticity after the cellulose is modified, reducing the using amount of matrix resin and improving the degradation speed of the hot melt adhesive. The cellulose contained in the bagasse has high crystallinity, a crystal region and an amorphous region coexist in a complex supermolecular structure, a large number of high-reactivity hydroxyl groups are sealed in the crystal region, and a large number of hydrogen bonds exist between molecules and in the molecules, which influence the reaction speed and uniformity of cellulose modification. The ethanol is added into the potassium hydroxide solution, so that the formation of hydrogen bonds among cellulose molecules can be prevented, the decrystallization and lattice transformation are facilitated, the crystallinity is reduced, and the reactivity of the cellulose is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a schematic view showing the structure of a diaper body in example 1;

FIG. 3 is a schematic structural view of the composite core in example 1;

FIG. 4 is a schematic view of the structure of the upper absorbent layer in example 1;

FIG. 5 is a schematic view of the structure of the lower absorbent layer in example 1;

figure 6 is a side view of the upper and lower absorbent layers of example 1.

Detailed Description

The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.

Example 1

Referring to fig. 1 to 6, a reinforced structure paper diaper with a composite core comprises a paper diaper body 1, wherein the defined paper diaper has a longitudinal direction along a length direction and a transverse direction along a width direction, a front waistline 2 and a rear waistline 3 are arranged on two longitudinal sides of the paper diaper body 1, hook and loop fasteners 4 are arranged on two transverse sides of the rear waistline 3, a hook and loop fastener matt surface 5 is arranged on one surface of the front waistline 2 away from the skin, the hook and loop fastener velcro 4 is in bonding fit with the matt hook and loop fastener 5, two transverse sides of the paper diaper body 1 are provided with leakage-proof guards 6, the paper diaper body 1 is formed by sequentially degradable bonding of an air-permeable surface layer 7, a flow guide layer 8, a composite core 9 and a leakage-proof bottom layer, the composite core 9 sequentially comprises a dust-free paper 10, an upper absorption layer 11, an elastic layer 12, a lower absorption layer 13 and a spun-bonded non-melt adhesive 14 from top to bottom, the composite core body is bonded through degradable hot melt adhesive between each layer, the upper absorption layer 11 comprises a middle region 11a and side-leakage-preventing regions 11b on the two transverse sides of the middle region 11a, a plurality of upper absorption sections 15 are longitudinally distributed on the middle region 11a, each upper absorption section 15 is arranged at intervals, the density of the super absorbent resin on the side-leakage-preventing regions 11b is greater than that of the upper absorption sections 15, a plurality of lower absorption sections 16 are longitudinally distributed on the lower absorption layer 13, each lower absorption section 16 is arranged at intervals, the lower absorption sections 16 are positioned under the gaps of the adjacent upper absorption sections 15 and are not overlapped with the projection of the upper absorption sections 15, dislocation is formed between the lower absorption sections, and the leakage-proof bottom layer is formed by compositing water-repellent non-woven fabrics 18 below the

breathable films

17 and 17.

The elastic layer is formed by compounding a hot-air non-woven fabric and an all-cotton non-woven fabric, so that the softness, water absorbability and air permeability of the all-cotton non-woven fabric are maintained, and the properties of high bulkiness and good elasticity of the hot-air non-woven fabric are also maintained, and a specific preparation method can be seen in patent No. 201610777897.8.

The preparation method of the degradable hot melt adhesive comprises the following steps:

a. the preparation of the modified biomass waste material comprises 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%, wherein the mass ratio of the bagasse powder to the potassium hydroxide solution is 1:1.8, adding ethanol with the mass of 10% of the bagasse powder, stirring and mixing for 80min at 50 ℃, then carrying out ultrasonic treatment for 1h with the work of 500W, standing for 6h, carrying out suction filtration, and washing with water 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 at 105 ℃ for 3 hours, and cooling, filtering and drying after the reaction is finished to obtain the modified biomass waste. The mass of the processed bagasse powder is calculated by 100%, and the dosage of the potassium hydroxide solution is 300%, the dosage of the dimethylformamide is 800%, the dosage of the benzyl chloride is 420%, and the dosage of the benzyltriethylammonium chloride is 0.8%.

b. Preparation of degradable polyester:

mixing malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid to form mixed acid, mixing 1, 5-pentanediol and ethylene glycol to form mixed alcohol, and then mixing the mixed acid and the mixed alcohol according to a molar ratio of 1:1.5, adding the mixed acid and the mixed alcohol into a reaction kettle, simultaneously adding phosphoric acid, an antioxidant 164 and a catalyst, carrying out esterification reaction for 2 hours at the temperature of 200 ℃, and then carrying out polycondensation reaction for 60 minutes under the conditions of the pressure of 60Pa and the temperature of 210 ℃ to obtain the degradable polyester. Wherein the molar ratio of 1, 5-pentanediol to ethylene glycol is 2:1, the molar ratio of malic acid to phthalic acid to 2, 6-naphthalenedicarboxylic acid is 2:3:4, the adding amounts of phosphoric acid, antioxidant 164 and catalyst are respectively 0.5%, 0.2% and 0.005% of the sum of the mass of the mixed acid and the mixed alcohol, and the catalyst is prepared by mixing germanium oxide and zinc acetate according to the mass ratio of 1: 0.8.

c. And (3) extruding and granulating:

weighing the following raw materials in percentage by mass: 60 parts of polybutylene adipate-terephthalate, 28 parts of degradable polyester, 20 parts of modified biomass waste and 12 parts of polyethylene wax, wherein the weight average molecular weight of the polybutylene adipate-terephthalate is 50000;

uniformly mixing the polybutylene adipate-terephthalate, the degradable polyester, the modified biomass waste and the viscosity regulator, adding the mixture into a double-screw extruder, extruding and granulating to obtain the degradable hot melt adhesive.

Example 2

The utility model provides a reinforced structure panty-shape diapers with compound core, its structure is the same with embodiment 1, and the difference lies in the preparation of degradable hot melt adhesive, and the concrete preparation step is as follows:

(1) cleaning, drying, crushing and screening bagasse to obtain bagasse powder, then soaking the bagasse powder into a potassium hydroxide solution with the concentration of 30wt%, wherein the mass ratio of the bagasse powder to the potassium hydroxide solution is 1:2.5, adding ethanol with the mass of 15% of the bagasse powder, stirring and mixing at 55 ℃ for 60min, then carrying out ultrasonic treatment for 90min with the power of 400W, standing for 7h, carrying out suction filtration, and washing with water to be neutral 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 4 hours at 110 ℃, and cooling, filtering and drying after the reaction is finished to obtain the modified biomass waste. The mass of the processed bagasse powder is calculated by 100 percent, and the dosage of the potassium hydroxide solution is 400 percent, the dosage of the dimethylformamide is 850 percent, the dosage of the benzyl chloride is 450 percent, and the dosage of the benzyltriethylammonium chloride is 1.5 percent.

b. Preparation of degradable polyester:

mixing malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid to form mixed acid, mixing 1, 5-pentanediol and ethylene glycol to form mixed alcohol, and then mixing the mixed acid and the mixed alcohol according to a molar ratio of 1:1.5, adding the mixed acid and the mixed alcohol into a reaction kettle, simultaneously adding phosphoric acid, an antioxidant 164 and a catalyst, carrying out esterification reaction for 2 hours at the temperature of 200 ℃, and then carrying out polycondensation reaction for 80 minutes under the conditions of the pressure of 70Pa and the temperature of 215 ℃ to obtain the degradable polyester. Wherein the molar ratio of 1, 5-pentanediol to ethylene glycol is 2:1, the molar ratio of malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid is 2:3:4, the addition amounts of phosphoric acid, antioxidant 164 and 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 according to the mass ratio of 1: 0.9.

c. And (3) extruding and granulating:

weighing the following raw materials in parts by mass: 70 parts of polybutylene adipate-terephthalate, 35 parts of degradable polyester, 30 parts of modified biomass waste and 15 parts of EVA (ethylene vinyl acetate), wherein the weight average molecular weight of the polybutylene adipate-terephthalate is 80000;

Example 3

(1) cleaning, drying, crushing and screening bagasse to obtain bagasse powder, then soaking the bagasse powder into a potassium hydroxide solution with the concentration of 30wt%, wherein the mass ratio of the bagasse powder to the potassium hydroxide solution is 1:3.2, adding ethanol with the mass of 20% of the bagasse powder, stirring and mixing for 40min at 60 ℃, then carrying out ultrasonic treatment for 2h with the power of 300W, standing for 8h, carrying out suction filtration, and washing with water 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 hours at 115 ℃, and cooling, filtering and drying after the reaction is finished to obtain the modified biomass waste. The mass of the processed bagasse powder is calculated by 100%, and the dosage of the potassium hydroxide solution is 500%, the dosage of the dimethylformamide is 900%, the dosage of the benzyl chloride is 480%, and the dosage of the benzyltriethylammonium chloride is 2%.

b. Preparation of degradable polyester:

mixing malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid to form mixed acid, mixing 1, 5-pentanediol and ethylene glycol to form mixed alcohol, and then mixing the mixed acid and the mixed alcohol according to a molar ratio of 1:1.5, adding the mixed acid and the mixed alcohol into a reaction kettle, simultaneously adding phosphoric acid, an antioxidant 164 and a catalyst, carrying out esterification reaction for 2 hours at the temperature of 200 ℃, and then carrying out polycondensation reaction for 90 minutes under the conditions of the pressure of 80Pa and the temperature of 220 ℃ to obtain the degradable polyester. Wherein the molar ratio of 1, 5-pentanediol to ethylene glycol is 2:1, the molar ratio of malic acid, phthalic acid and 2, 6-naphthalenedicarboxylic acid is 2:3:4, the addition amounts of phosphoric acid, antioxidant 164 and catalyst are respectively 0.8%, 0.4% and 0.015% 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 according to the mass ratio of 1:1.

c. And (3) extruding and granulating:

weighing the following raw materials in parts by mass: 80 parts of polybutylene adipate-terephthalate, 42 parts of degradable polyester, 40 parts of modified biomass waste and 18 parts of naphthenic oil, wherein the weight average molecular weight of the polybutylene adipate-terephthalate is 100000;

Example 4

The structure of the reinforced structure paper diaper with the composite core body is the same as that in the embodiment 1, the difference is that ethanol is not added in the preparation process of modified biomass waste used for degrading the hot melt adhesive, and other raw material components and the content of the hot melt adhesive are the same as those in the embodiment 1.

Comparative example 1

The utility model provides a reinforced structure panty-shape diapers with compound core, its structure is the same with embodiment 1, and the difference lies in that degradable hot melt adhesive is made by the raw materials of following mass ratio: 60 parts of polybutylene adipate-terephthalate (with the weight-average molecular weight of 50000), 4 parts of acetyl tributyl citrate, 28 parts of degradable polyester, 20 parts of modified biomass waste and 12 parts of polyethylene wax, wherein the preparation method of the degradable hot melt adhesive is the same as that of example 1.

Comparative example 2

The utility model provides a reinforced structure panty-shape diapers with compound core, its structure is the same with embodiment 1, and the difference lies in that degradable hot melt adhesive is made by the raw materials of following mass ratio: 60 parts of polybutylene adipate-terephthalate (with the weight-average molecular weight of 50000), 4 parts of acetyl tributyl citrate, 24 parts of degradable polyester, 20 parts of modified biomass waste and 12 parts of polyethylene wax, wherein the preparation method of the degradable hot melt adhesive is the same as that of example 1.

Comparative example 3

The structure of the reinforced structure paper diaper with the composite core body is the same as that in the embodiment 1, except that the raw material degradable polyester of the degradable hot melt adhesive is replaced by tackifying resin, namely rosin resin, and the content and the preparation method of other components of the degradable hot melt adhesive are the same as those in the embodiment 1.

Comparative example 4

The structure of the reinforced structure paper diaper with the composite core body is the same as that in the embodiment 1, the difference is that modified biomass waste is not added in the formula of the degradable hot melt adhesive, the modified biomass waste with the same weight part is replaced by poly (butylene adipate-terephthalate), and the content of other components of the degradable hot melt adhesive and the preparation method are the same as those in the embodiment 1.

The degradable hot melt adhesives obtained in examples 1-4 and comparative examples 1-4 were subjected to performance tests, wherein the peel strength was measured by GB/T2791-95, the elongation at break was measured by ASTM D638, and the melt viscosity (160 ℃) was measured by HGT 3660-1999 standard. The obtained degradable hot melt adhesive samples were respectively placed for a period of time under outdoor environmental conditions, the change of the quality was periodically measured, the degradation rate (initial quality-quality after being placed for a period of time)/initial quality x 100%, and the test results are shown in table 1:

TABLE 1

As can be seen from Table 1, the hot melt adhesive prepared by the embodiment of the invention has good adhesive strength, toughness, heat resistance and fluidity. Compared with example 1, comparative example 1 adds a new plasticizer of acetyl tributyl citrate, and has little change on peel strength and elongation at break; comparative example 2 the peel strength and elongation at break were both reduced by replacing a portion of the amount of degradable polyester with the plasticizer acetyl tributyl citrate; comparative example 3 after the degradable polyester is replaced by the rosin resin, the peeling strength and the elongation at break are obviously deteriorated, the melt viscosity of the hot melt adhesive is greatly improved, the infiltration degree of the adhered object is influenced, and the adhering effect is obviously deteriorated; comparative example 4, in which no modified biomass waste was added, the adhesive effect was deteriorated although the elongation at break was increased. From comparative examples 1-2 and example 1, it can be seen that the degradable polyester not only can play the role of tackifying resin, but also can act as a plasticizer, improving the elongation at break of the hot melt adhesive.

The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.

Claims

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.