A kind of hydrophilic hot-melt adhesive and its preparation method and application

A hot-melt, hydrophilic technology, used in adhesives, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of reducing the surface tension of urine, increasing urine leakage, etc., to improve the absorption performance, Improve absorption, fast pass through absorption

Active Publication Date: 2022-03-15
苏州科化聚慧新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during use, the hydrophilic agent attached to the surface of the non-woven fiber will dissolve in the urine when the urine passes through, thereby reducing the surface tension of the urine
Urine with low surface energy will more easily penetrate the above-mentioned breathable membrane and spunbonded meltblown nonwoven fabric, which increases the possibility of urine leakage and causes problems for consumers

Method used

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  • A kind of hydrophilic hot-melt adhesive and its preparation method and application

Examples

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preparation example Construction

[0025] As an aspect of the technical solution of the present invention, it relates to a method for preparing a hydrophilic hot-melt adhesive, which includes: making polyols containing polyhydroxy polyethers, polyhydroxy polyesters, polyhydric alcohols that may or may not be contained, The homogeneous mixed reaction system copolymerization reaction of polyisocyanate, low-melting point polyester with or without inclusion, and polyurethane with or without inclusion forms a hydrophilic hot-melt adhesive.

[0026] In some embodiments, the above polyhydroxy polyether and polyhydroxy polyester can be pre-mixed and stirred by heating, and then polyisocyanate can be added in one or more steps. The temperature of the copolymerization reaction is 60-160° C., and the time is 1-8 hours, preferably 2-8 hours.

[0027] Further, after the reaction is completed, materials such as polyhydroxy polyethers, polyhydroxy polyesters, polyols, polyurethanes, and low-melting point polyesters can be fur...

Embodiment 1

[0055] In this embodiment, the formula of the hydrophilic hot-melt adhesive is selected as 25 g of difunctional polyethylene adipate (molecular weight 3000), 40 g of difunctional polyethylene glycol (molecular weight 3000), and polyneopentyl adipate. Alcohol (molecular weight: 3000) 25g, trifunctional polyether 16g, MDI 9.5g. The above components were uniformly mixed and then copolymerized. The reaction temperature was set at 160° C. and the reaction time was 1 h. After that, 6 g of neopentyl glycol was added, and the temperature was gradually lowered to 120° C. for 1 hour.

[0056] The hydrophilic hot-melt adhesive synthesized in this example has a viscosity of 7000 centipoise at 160° C. and can be effectively coated on a non-woven fabric substrate.

Embodiment 2

[0058] The hydrophilic hot-melt adhesive prepared in Example 1 was compared with the commercially available rubber-based hot-melt adhesive, using sizing coating equipment, using 15g / m 2 Two pieces of hydrophilic spun-bonded non-woven fabrics are used, and the surface of the first non-woven fabric is coated with linear glue lines with a diameter of 0.5mm, and the distance between the glue lines is 3mm, and then the second piece of non-woven fabric is pasted. Use a dust-free filter paper pad to test the permeation rate of physiological saline under the above non-woven layer to be tested. Use 1cm 2 Use a syringe with a cross-sectional area, use 5mL of normal saline each time, and record the penetration time of the first, second and third times of normal saline respectively. The results are shown in Table 1 below.

[0059] Table 1

[0060] Seepage time (s) Hydrophilic hot melt adhesive structure Rubber-based adhesive construction the first time 24 24 t...

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Abstract

The invention discloses a hydrophilic hot-melt adhesive, a preparation method and application thereof. The preparation method includes: making a homogeneously mixed reaction system including polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting point polyester and polyurethane copolymerized to form a hydrophilic hot-melt adhesive. Application of the hydrophilic hot-melt adhesive prepared by the aforementioned method in the field of hygienic absorbent product production, the application includes using the hydrophilic hot-melt adhesive to perform multi-layer bonding of the absorbent part material contained in the hygienic absorbent product . The hygienic absorbent product of the present invention is obtained by using the aforementioned hydrophilic hot-melt adhesive to bond the absorbent part material in multiple layers. The preparation method of the hydrophilic hot-melt adhesive of the present invention is simple, and the hydrophilic hot-melt adhesive is used to bond the multi-layer non-woven fabric layers in the main structure of sanitary absorbent articles such as diapers, thereby effectively improving the Absorption properties of hygienic absorbent products such as diapers.

Description

technical field [0001] The present invention relates to a hydrophilic adhesive, in particular to a hydrophilic hot-melt adhesive used in the bonding of multi-layer non-woven fabric layers in sanitary absorbent products and a preparation method thereof, and its use in making sanitary absorbent products Applications. Background technique [0002] The design of hygienic absorbent products such as diapers requires the use of multi-layer nonwoven structures. The typical structure is: the uppermost surface layer that contacts the user's skin, the diversion layer below the surface layer that diffuses urine, and the core wrapping layer under the diversion layer. The core wrapping layer can wrap the prefabricated composite core, and can also wrap the core directly physically mixed with wood pulp and water-absorbing polymer. The structure of each layer of non-woven fabric above can be one layer of non-woven fabric, or multiple layers of non-woven fabric, which are composited by mech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/32C08G18/42C08G18/48C08G18/66C08G18/76A61L15/58
CPCC09J175/06C09J175/08C08G18/4238C08G18/4833C08G18/4829C08G18/4812C08G18/4211C08G18/4202C08G18/7671C08G18/3206C08G18/4018C08G18/6607C08G18/6611A61L15/585
Inventor 霍毅松
Owner 苏州科化聚慧新材料有限公司
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